local mp = require 'mp'
local utils = require 'mp.utils'
local msg = require 'mp.msg'

local M = {}

local MEDEIA_LUA_VERSION = '2025-12-18'

-- Track whether uosc is available so menu calls don't fail with
-- "Can't find script 'uosc' to send message to."
local _uosc_loaded = false

mp.register_script_message('uosc-version', function(_ver)
    _uosc_loaded = true
end)

local function _is_script_loaded(name)
    local ok, list = pcall(mp.get_property_native, 'script-list')
    if not ok or type(list) ~= 'table' then
        return false
    end
    for _, s in ipairs(list) do
        if type(s) == 'table' then
            local n = s.name or ''
            if n == name or tostring(n):match('^' .. name .. '%d*$') then
                return true
            end
        elseif type(s) == 'string' then
            local n = s
            if n == name or tostring(n):match('^' .. name .. '%d*$') then
                return true
            end
        end
    end
    return false
end

local LOAD_URL_MENU_TYPE = 'medios_load_url'

local DOWNLOAD_FORMAT_MENU_TYPE = 'medios_download_pick_format'
local DOWNLOAD_STORE_MENU_TYPE = 'medios_download_pick_store'

local PIPELINE_REQ_PROP = 'user-data/medeia-pipeline-request'
local PIPELINE_RESP_PROP = 'user-data/medeia-pipeline-response'
local PIPELINE_READY_PROP = 'user-data/medeia-pipeline-ready'

-- Dedicated Lua log (next to mpv log-file) because mp.msg output is not always
-- included in --log-file depending on msg-level and build.
local function _lua_log(text)
    local payload = (text and tostring(text) or '')
    if payload == '' then
        return
    end
    local dir = ''

    -- Prefer repo-root Log/ for consistency with Python helper logs.
    do
        local function find_up(start_dir, relative_path, max_levels)
            local d = start_dir
            local levels = max_levels or 6
            for _ = 0, levels do
                if d and d ~= '' then
                    local candidate = d .. '/' .. relative_path
                    if utils.file_info(candidate) then
                        return candidate
                    end
                end
                local parent = d and d:match('(.*)[/\\]') or nil
                if not parent or parent == d or parent == '' then
                    break
                end
                d = parent
            end
            return nil
        end

        local base = mp.get_script_directory() or utils.getcwd() or ''
        if base ~= '' then
            local cli = find_up(base, 'CLI.py', 8)
            if cli and cli ~= '' then
                local root = cli:match('(.*)[/\\]') or ''
                if root ~= '' then
                    dir = utils.join_path(root, 'Log')
                end
            end
        end
    end

    -- Fallback: next to mpv --log-file.
    if dir == '' then
        local log_file = mp.get_property('options/log-file') or ''
        dir = log_file:match('(.*)[/\\]') or ''
    end
    if dir == '' then
        dir = mp.get_script_directory() or utils.getcwd() or ''
    end
    if dir == '' then
        return
    end
    local path = utils.join_path(dir, 'medeia-mpv-lua.log')
    local fh = io.open(path, 'a')
    if not fh then
        return
    end
    local line = '[' .. os.date('%Y-%m-%d %H:%M:%S') .. '] ' .. payload
    fh:write(line .. '\n')
    fh:close()

    -- Also mirror Lua-side debug into the Python helper log file so there's one
    -- place to look when diagnosing mpv↔python IPC issues.
    do
        local helper_path = utils.join_path(dir, 'medeia-mpv-helper.log')
        local fh2 = io.open(helper_path, 'a')
        if fh2 then
            fh2:write('[lua] ' .. line .. '\n')
            fh2:close()
        end
    end
end

local function ensure_uosc_loaded()
    if _uosc_loaded or _is_script_loaded('uosc') then
        _uosc_loaded = true
        return true
    end

    local entry = nil
    pcall(function()
        entry = mp.find_config_file('scripts/uosc.lua')
    end)
    if not entry or entry == '' then
        _lua_log('uosc entry not found at scripts/uosc.lua under config-dir')
        return false
    end

    local ok = pcall(mp.commandv, 'load-script', entry)
    if ok then
        _lua_log('Loaded uosc from: ' .. tostring(entry))
    else
        _lua_log('Failed to load uosc from: ' .. tostring(entry))
    end

    -- uosc will broadcast uosc-version on load; also re-check script-list if available.
    if _is_script_loaded('uosc') then
        _uosc_loaded = true
        return true
    end
    return _uosc_loaded
end

local function write_temp_log(prefix, text)
    if not text or text == '' then
        return nil
    end

    local dir = ''
    -- Prefer repo-root Log/ for easier discovery.
    do
        local function find_up(start_dir, relative_path, max_levels)
            local d = start_dir
            local levels = max_levels or 6
            for _ = 0, levels do
                if d and d ~= '' then
                    local candidate = d .. '/' .. relative_path
                    if utils.file_info(candidate) then
                        return candidate
                    end
                end
                local parent = d and d:match('(.*)[/\\]') or nil
                if not parent or parent == d or parent == '' then
                    break
                end
                d = parent
            end
            return nil
        end

        local base = mp.get_script_directory() or utils.getcwd() or ''
        if base ~= '' then
            local cli = find_up(base, 'CLI.py', 6)
            if cli and cli ~= '' then
                local parent = cli:match('(.*)[/\\]') or ''
                if parent ~= '' then
                    dir = utils.join_path(parent, 'Log')
                    -- Best-effort create dir.
                    local sep = package and package.config and package.config:sub(1, 1) or '/'
                    if sep == '\\' then
                        pcall(utils.subprocess, { args = { 'cmd.exe', '/c', 'mkdir "' .. dir .. '" 1>nul 2>nul' } })
                    else
                        pcall(utils.subprocess, { args = { 'sh', '-lc', 'mkdir -p ' .. string.format('%q', dir) .. ' >/dev/null 2>&1' } })
                    end
                end
            end
        end
    end
    if dir == '' then
        dir = os.getenv('TEMP') or os.getenv('TMP') or utils.getcwd() or ''
    end
    if dir == '' then
        return nil
    end
    local name = (prefix or 'medeia-mpv') .. '-' .. tostring(math.floor(mp.get_time() * 1000)) .. '.log'
    local path = utils.join_path(dir, name)
    local fh = io.open(path, 'w')
    if not fh then
        return nil
    end
    fh:write(text)
    fh:close()
    return path
end

local function trim(s)
    return (s:gsub('^%s+', ''):gsub('%s+$', ''))
end

-- Lyrics overlay toggle
-- The Python helper (python -m MPV.lyric) will read this property via IPC.
local LYRIC_VISIBLE_PROP = "user-data/medeia-lyric-visible"

local function lyric_get_visible()
    local ok, v = pcall(mp.get_property_native, LYRIC_VISIBLE_PROP)
    if not ok or v == nil then
        return true
    end
    return v and true or false
end

local function lyric_set_visible(v)
    pcall(mp.set_property_native, LYRIC_VISIBLE_PROP, v and true or false)
end

local function lyric_toggle()
    local now = not lyric_get_visible()
    lyric_set_visible(now)
    mp.osd_message("Lyrics: " .. (now and "on" or "off"), 1)
end

-- Default to visible unless user overrides.
lyric_set_visible(true)

-- Configuration
local opts = {
    python_path = "python",
    cli_path = nil -- Will be auto-detected if nil
}

local function find_file_upwards(start_dir, relative_path, max_levels)
    local dir = start_dir
    local levels = max_levels or 6
    for _ = 0, levels do
        if dir and dir ~= "" then
            local candidate = dir .. "/" .. relative_path
            if utils.file_info(candidate) then
                return candidate
            end
        end
        local parent = dir and dir:match("(.*)[/\\]") or nil
        if not parent or parent == dir or parent == "" then
            break
        end
        dir = parent
    end
    return nil
end

local _cached_store_names = {}
local _store_cache_loaded = false

local _pipeline_helper_started = false

local function _is_pipeline_helper_ready()
    local ready = mp.get_property_native(PIPELINE_READY_PROP)
    if not ready then
        return false
    end
    local s = tostring(ready)
    if s == '' or s == '0' then
        return false
    end

    -- Back-compat: older helpers may set "1". New helpers set unix timestamps.
    local n = tonumber(s)
    if n and n > 1000000000 then
        local now = (os and os.time) and os.time() or nil
        if not now then
            return true
        end
        local age = now - n
        if age < 0 then
            age = 0
        end
        return age <= 10
    end

    return true
end

local function get_mpv_ipc_path()
    local ipc = mp.get_property('input-ipc-server')
    if ipc and ipc ~= '' then
        return ipc
    end
    -- Fallback: fixed pipe/socket name used by MPV/mpv_ipc.py
    local sep = package and package.config and package.config:sub(1, 1) or '/'
    if sep == '\\' then
        return '\\\\.\\pipe\\mpv-medeia-macina'
    end
    return '/tmp/mpv-medeia-macina.sock'
end

local function ensure_mpv_ipc_server()
    -- `.pipe -play` (Python) controls MPV via JSON IPC. If mpv was started
    -- without --input-ipc-server, make sure we set one so the running instance
    -- can be controlled (instead of Python spawning a separate mpv).
    local ipc = mp.get_property('input-ipc-server')
    if ipc and ipc ~= '' then
        return true
    end

    local desired = get_mpv_ipc_path()
    if not desired or desired == '' then
        return false
    end

    local ok = pcall(mp.set_property, 'input-ipc-server', desired)
    if not ok then
        return false
    end
    local now = mp.get_property('input-ipc-server')
    return (now and now ~= '') and true or false
end

local function quote_pipeline_arg(s)
    -- Ensure URLs with special characters (e.g. &, #) survive pipeline parsing.
    s = tostring(s or '')
    s = s:gsub('\\', '\\\\'):gsub('"', '\\"')
    return '"' .. s .. '"'
end

local function _is_windows()
    local sep = package and package.config and package.config:sub(1, 1) or '/'
    return sep == '\\'
end

local function _extract_target_from_memory_uri(text)
    if type(text) ~= 'string' then
        return nil
    end
    if not text:match('^memory://') then
        return nil
    end
    for line in text:gmatch('[^\r\n]+') do
        line = trim(line)
        if line ~= '' and not line:match('^#') and not line:match('^memory://') then
            return line
        end
    end
    return nil
end

local function _percent_decode(s)
    if type(s) ~= 'string' then
        return s
    end
    return (s:gsub('%%(%x%x)', function(hex)
        return string.char(tonumber(hex, 16))
    end))
end

local function _extract_query_param(url, key)
    if type(url) ~= 'string' then
        return nil
    end
    key = tostring(key or '')
    if key == '' then
        return nil
    end
    local pattern = '[?&]' .. key:gsub('([^%w])', '%%%1') .. '=([^&#]+)'
    local v = url:match(pattern)
    if v then
        return _percent_decode(v)
    end
    return nil
end

local function _current_target()
    local path = mp.get_property('path')
    if not path or path == '' then
        return nil
    end
    local mem = _extract_target_from_memory_uri(path)
    if mem and mem ~= '' then
        return mem
    end
    return path
end

local function _extract_store_hash(target)
    if type(target) ~= 'string' or target == '' then
        return nil
    end
    local hash = _extract_query_param(target, 'hash')
    local store = _extract_query_param(target, 'store')
    if hash and store then
        local h = tostring(hash):lower()
        if h:match('^[0-9a-f]+$') and #h == 64 then
            return { store = tostring(store), hash = h }
        end
    end
    return nil
end

local function _pick_folder_windows()
    -- Native folder picker via PowerShell + WinForms.
    local ps = [[Add-Type -AssemblyName System.Windows.Forms; $d = New-Object System.Windows.Forms.FolderBrowserDialog; $d.Description = 'Select download folder'; $d.ShowNewFolderButton = $true; if ($d.ShowDialog() -eq [System.Windows.Forms.DialogResult]::OK) { $d.SelectedPath }]]
    local res = utils.subprocess({
        args = { 'powershell', '-NoProfile', '-STA', '-ExecutionPolicy', 'Bypass', '-Command', ps },
        cancellable = false,
    })
    if res and res.status == 0 and res.stdout then
        local out = trim(tostring(res.stdout))
        if out ~= '' then
            return out
        end
    end
    return nil
end

-- Forward declaration: used by run_pipeline_via_ipc_response before definition.
local ensure_pipeline_helper_running

local function _run_helper_request_response(req, timeout_seconds)
    if not ensure_pipeline_helper_running() then
        _lua_log('ipc: helper not running; cannot execute request')
        return nil
    end

    do
        local deadline = mp.get_time() + 3.0
        while mp.get_time() < deadline do
            if _is_pipeline_helper_ready() then
                break
            end
            mp.wait_event(0.05)
        end
        if not _is_pipeline_helper_ready() then
            _lua_log('ipc: helper not ready; ready=' .. tostring(mp.get_property_native(PIPELINE_READY_PROP)))
            _pipeline_helper_started = false
            return nil
        end
    end

    if type(req) ~= 'table' then
        return nil
    end

    local id = tostring(req.id or '')
    if id == '' then
        id = tostring(math.floor(mp.get_time() * 1000)) .. '-' .. tostring(math.random(100000, 999999))
        req.id = id
    end

    local label = ''
    if req.op then
        label = 'op=' .. tostring(req.op)
    elseif req.pipeline then
        label = 'cmd=' .. tostring(req.pipeline)
    else
        label = '(unknown)'
    end
    _lua_log('ipc: send request id=' .. tostring(id) .. ' ' .. label)

    mp.set_property(PIPELINE_RESP_PROP, '')
    mp.set_property(PIPELINE_REQ_PROP, utils.format_json(req))

    local deadline = mp.get_time() + (timeout_seconds or 5)
    while mp.get_time() < deadline do
        local resp_json = mp.get_property(PIPELINE_RESP_PROP)
        if resp_json and resp_json ~= '' then
            local ok, resp = pcall(utils.parse_json, resp_json)
            if ok and resp and resp.id == id then
                _lua_log('ipc: got response id=' .. tostring(id) .. ' success=' .. tostring(resp.success))
                return resp
            end
        end
        mp.wait_event(0.05)
    end

    _lua_log('ipc: timeout waiting response; ' .. label)
    _pipeline_helper_started = false
    return nil
end

-- IPC helper: return the whole response object (stdout/stderr/error/table)
local function run_pipeline_via_ipc_response(pipeline_cmd, seeds, timeout_seconds)
    local req = { pipeline = pipeline_cmd }
    if seeds then
        req.seeds = seeds
    end
    return _run_helper_request_response(req, timeout_seconds)
end

local function _refresh_store_cache(timeout_seconds)
    ensure_mpv_ipc_server()
    local resp = _run_helper_request_response({ op = 'store-choices' }, timeout_seconds or 1)
    if not resp or not resp.success or type(resp.choices) ~= 'table' then
        _lua_log('stores: failed to load store choices via helper; stderr=' .. tostring(resp and resp.stderr or '') .. ' error=' .. tostring(resp and resp.error or ''))

        -- Fallback: directly call Python to import CLI.get_store_choices().
        -- This avoids helper IPC issues and still stays in sync with the REPL.
        local python = (opts and opts.python_path) and tostring(opts.python_path) or 'python'
        local cli_path = (opts and opts.cli_path) and tostring(opts.cli_path) or nil
        if not cli_path or cli_path == '' or not utils.file_info(cli_path) then
            local base_dir = mp.get_script_directory() or utils.getcwd() or ''
            if base_dir ~= '' then
                cli_path = find_file_upwards(base_dir, 'CLI.py', 8)
            end
        end

        if cli_path and cli_path ~= '' then
            local root = tostring(cli_path):match('(.*)[/\\]') or ''
            if root ~= '' then
                local code = "import json, sys; sys.path.insert(0, r'" .. root .. "'); from CLI import get_store_choices; print(json.dumps(get_store_choices()))"
                local res = utils.subprocess({
                    args = { python, '-c', code },
                    cancellable = false,
                })
                if res and res.status == 0 and res.stdout then
                    local out_text = tostring(res.stdout)
                    local last_line = ''
                    for line in out_text:gmatch('[^\r\n]+') do
                        if trim(line) ~= '' then
                            last_line = line
                        end
                    end
                    local ok, parsed = pcall(utils.parse_json, last_line ~= '' and last_line or out_text)
                    if ok and type(parsed) == 'table' then
                        local out = {}
                        for _, v in ipairs(parsed) do
                            local name = trim(tostring(v or ''))
                            if name ~= '' then
                                out[#out + 1] = name
                            end
                        end
                        if #out > 0 then
                            _cached_store_names = out
                            _store_cache_loaded = true
                            _lua_log('stores: loaded ' .. tostring(#_cached_store_names) .. ' stores via python fallback')
                            return true
                        end
                    end
                else
                    _lua_log('stores: python fallback failed; status=' .. tostring(res and res.status or 'nil') .. ' stderr=' .. tostring(res and res.stderr or ''))
                end
            end
        end

        return false
    end

    local out = {}
    for _, v in ipairs(resp.choices) do
        local name = trim(tostring(v or ''))
        if name ~= '' then
            out[#out + 1] = name
        end
    end
    _cached_store_names = out
    _store_cache_loaded = true
    _lua_log('stores: loaded ' .. tostring(#_cached_store_names) .. ' stores via helper')
    return true
end

local function _uosc_open_list_picker(menu_type, title, items)
    local menu_data = {
        type = menu_type,
        title = title,
        items = items or {},
    }
    if ensure_uosc_loaded() then
        mp.commandv('script-message-to', 'uosc', 'open-menu', utils.format_json(menu_data))
    else
        _lua_log('menu: uosc not available; cannot open-menu')
    end
end

-- No-op handler for placeholder menu items.
mp.register_script_message('medios-nop', function()
    return
end)

local _pending_download = nil
local _pending_format_change = nil

-- Cache yt-dlp format lists per URL so Change Format is instant.
M.file = M.file or {}
M.file.formats_table = nil
M.file.url = nil
local _formats_cache = {}
local _formats_inflight = {}

local function _is_http_url(u)
    if type(u) ~= 'string' then
        return false
    end
    return u:match('^https?://') ~= nil
end

local function _cache_formats_for_url(url, tbl)
    if type(url) ~= 'string' or url == '' then
        return
    end
    if type(tbl) ~= 'table' then
        return
    end
    _formats_cache[url] = { table = tbl, ts = mp.get_time() }
    M.file.url = url
    M.file.formats_table = tbl
end

local function _get_cached_formats_table(url)
    if type(url) ~= 'string' or url == '' then
        return nil
    end
    local hit = _formats_cache[url]
    if type(hit) == 'table' and type(hit.table) == 'table' then
        return hit.table
    end
    return nil
end

local function _prefetch_formats_for_url(url)
    url = tostring(url or '')
    if url == '' or not _is_http_url(url) then
        return
    end

    -- Only applies to plain URLs (not store hash URLs).
    if _extract_store_hash(url) then
        return
    end

    if _get_cached_formats_table(url) then
        return
    end
    if _formats_inflight[url] then
        return
    end
    _formats_inflight[url] = true

    mp.add_timeout(0.01, function()
        if _get_cached_formats_table(url) then
            _formats_inflight[url] = nil
            return
        end

        ensure_mpv_ipc_server()
        local resp = _run_helper_request_response({ op = 'ytdlp-formats', data = { url = url } }, 20)
        _formats_inflight[url] = nil

        if resp and resp.success and type(resp.table) == 'table' then
            _cache_formats_for_url(url, resp.table)
            _lua_log('formats: cached ' .. tostring((resp.table.rows and #resp.table.rows) or 0) .. ' rows for url')
        end
    end)
end

local function _open_loading_formats_menu(title)
    _uosc_open_list_picker(DOWNLOAD_FORMAT_MENU_TYPE, title or 'Pick format', {
        {
            title = 'Loading formats…',
            hint = 'Fetching format list',
            value = { 'script-message-to', mp.get_script_name(), 'medios-nop', '{}' },
        },
    })
end

local function _current_ytdl_format_string()
    -- Preferred: mpv exposes the active ytdl format string.
    local fmt = trim(tostring(mp.get_property_native('ytdl-format') or ''))
    if fmt ~= '' then
        return fmt
    end

    -- Fallbacks: option value, or raw info if available.
    local opt = trim(tostring(mp.get_property('options/ytdl-format') or ''))
    if opt ~= '' then
        return opt
    end

    local raw = mp.get_property_native('ytdl-raw-info')
    if type(raw) == 'table' then
        if raw.format_id and tostring(raw.format_id) ~= '' then
            return tostring(raw.format_id)
        end
        local rf = raw.requested_formats
        if type(rf) == 'table' then
            local parts = {}
            for _, item in ipairs(rf) do
                if type(item) == 'table' and item.format_id and tostring(item.format_id) ~= '' then
                    parts[#parts + 1] = tostring(item.format_id)
                end
            end
            if #parts >= 1 then
                return table.concat(parts, '+')
            end
        end
    end

    return nil
end

local function _run_pipeline_detached(pipeline_cmd)
    if not pipeline_cmd or pipeline_cmd == '' then
        return false
    end
    local python = (opts and opts.python_path) and tostring(opts.python_path) or 'python'
    local cli = (opts and opts.cli_path) and tostring(opts.cli_path) or 'CLI.py'
    local args = { python, cli, 'pipeline', '--pipeline', pipeline_cmd }
    local ok = utils.subprocess_detached({ args = args })
    return ok ~= nil
end

local function _open_save_location_picker_for_pending_download()
    if type(_pending_download) ~= 'table' or not _pending_download.url or not _pending_download.format then
        return
    end

    local function build_items()
        local items = {
            {
                title = 'Pick folder…',
                hint = 'Save to a local folder',
                value = { 'script-message-to', mp.get_script_name(), 'medios-download-pick-path', '{}' },
            },
        }

        if type(_cached_store_names) == 'table' and #_cached_store_names > 0 then
            for _, name in ipairs(_cached_store_names) do
                name = trim(tostring(name or ''))
                if name ~= '' then
                    local payload = { store = name }
                    items[#items + 1] = {
                        title = name,
                        value = { 'script-message-to', mp.get_script_name(), 'medios-download-pick-store', utils.format_json(payload) },
                    }
                end
            end
        end
        return items
    end

    -- Always open immediately with whatever store cache we have.
    _uosc_open_list_picker(DOWNLOAD_STORE_MENU_TYPE, 'Save location', build_items())

    -- Best-effort refresh; if it succeeds, reopen menu with stores.
    mp.add_timeout(0.05, function()
        if type(_pending_download) ~= 'table' or not _pending_download.url or not _pending_download.format then
            return
        end
        local before = (type(_cached_store_names) == 'table') and #_cached_store_names or 0
        if _refresh_store_cache(1.5) then
            local after = (type(_cached_store_names) == 'table') and #_cached_store_names or 0
            if after > 0 and after ~= before then
                _uosc_open_list_picker(DOWNLOAD_STORE_MENU_TYPE, 'Save location', build_items())
            end
        end
    end)
end

-- Prime store cache shortly after load (best-effort; picker also refreshes on-demand).
mp.add_timeout(0.10, function()
    if not _store_cache_loaded then
        pcall(_refresh_store_cache, 1.5)
    end
end)

local function _apply_ytdl_format_and_reload(url, fmt)
    if not url or url == '' or not fmt or fmt == '' then
        return
    end

    local pos = mp.get_property_number('time-pos')
    local paused = mp.get_property_native('pause') and true or false

    _lua_log('change-format: setting options/ytdl-format=' .. tostring(fmt))
    pcall(mp.set_property, 'options/ytdl-format', tostring(fmt))

    if pos and pos > 0 then
        mp.commandv('loadfile', url, 'replace', 'start=' .. tostring(pos))
    else
        mp.commandv('loadfile', url, 'replace')
    end

    if paused then
        mp.set_property_native('pause', true)
    end
end

local function _start_download_flow_for_current()
    local target = _current_target()
    if not target or target == '' then
        mp.osd_message('No current item', 2)
        return
    end

    _lua_log('download: current target=' .. tostring(target))

    local store_hash = _extract_store_hash(target)
    if store_hash then
        if not _is_windows() then
            mp.osd_message('Download folder picker is Windows-only', 4)
            return
        end
        local folder = _pick_folder_windows()
        if not folder or folder == '' then
            return
        end
        ensure_mpv_ipc_server()
        M.run_pipeline('get-file -store ' .. quote_pipeline_arg(store_hash.store) .. ' -hash ' .. store_hash.hash .. ' -path ' .. quote_pipeline_arg(folder))
        mp.osd_message('Download started', 2)
        return
    end

    -- Non-store URL flow: use the current yt-dlp-selected format and ask for save location.
    local url = tostring(target)
    local fmt = _current_ytdl_format_string()

    if not fmt or fmt == '' then
        _lua_log('download: could not determine current ytdl format string')
        mp.osd_message('Cannot determine current format; use Change Format first', 5)
        return
    end

    _lua_log('download: using current format=' .. tostring(fmt))
    _pending_download = { url = url, format = fmt }
    _open_save_location_picker_for_pending_download()
end

mp.register_script_message('medios-download-current', function()
    _start_download_flow_for_current()
end)

mp.register_script_message('medios-change-format-current', function()
    local target = _current_target()
    if not target or target == '' then
        mp.osd_message('No current item', 2)
        return
    end

    local store_hash = _extract_store_hash(target)
    if store_hash then
        mp.osd_message('Change Format is only for URL playback', 4)
        return
    end

    local url = tostring(target)

    -- If formats were already prefetched for this URL, open instantly.
    local cached_tbl = _get_cached_formats_table(url)
    if type(cached_tbl) == 'table' and type(cached_tbl.rows) == 'table' and #cached_tbl.rows > 0 then
        _pending_format_change = { url = url, token = 'cached', formats_table = cached_tbl }

        local items = {}
        for idx, row in ipairs(cached_tbl.rows) do
            local cols = row.columns or {}
            local id_val = ''
            local res_val = ''
            local ext_val = ''
            local size_val = ''
            for _, c in ipairs(cols) do
                if c.name == 'ID' then id_val = tostring(c.value or '') end
                if c.name == 'Resolution' then res_val = tostring(c.value or '') end
                if c.name == 'Ext' then ext_val = tostring(c.value or '') end
                if c.name == 'Size' then size_val = tostring(c.value or '') end
            end
            local label = id_val ~= '' and id_val or ('Format ' .. tostring(idx))
            local hint_parts = {}
            if res_val ~= '' and res_val ~= 'N/A' then table.insert(hint_parts, res_val) end
            if ext_val ~= '' then table.insert(hint_parts, ext_val) end
            if size_val ~= '' and size_val ~= 'N/A' then table.insert(hint_parts, size_val) end
            local hint = table.concat(hint_parts, ' | ')

            local payload = { index = idx }
            items[#items + 1] = {
                title = label,
                hint = hint,
                value = { 'script-message-to', mp.get_script_name(), 'medios-change-format-pick', utils.format_json(payload) },
            }
        end

        _uosc_open_list_picker(DOWNLOAD_FORMAT_MENU_TYPE, 'Change format', items)
        return
    end

    local token = tostring(math.floor(mp.get_time() * 1000)) .. '-' .. tostring(math.random(100000, 999999))
    _pending_format_change = { url = url, token = token }
    _open_loading_formats_menu('Change format')

    mp.add_timeout(0.05, function()
        if type(_pending_format_change) ~= 'table' or _pending_format_change.token ~= token then
            return
        end

        ensure_mpv_ipc_server()
        _lua_log('change-format: requesting formats via helper op for url')

        local resp = _run_helper_request_response({ op = 'ytdlp-formats', data = { url = url } }, 30)
        if type(_pending_format_change) ~= 'table' or _pending_format_change.token ~= token then
            return
        end

        if not resp or not resp.success or type(resp.table) ~= 'table' then
            local err = ''
            if type(resp) == 'table' then
                if resp.error and tostring(resp.error) ~= '' then err = tostring(resp.error) end
                if resp.stderr and tostring(resp.stderr) ~= '' then
                    err = (err ~= '' and (err .. ' | ') or '') .. tostring(resp.stderr)
                end
            end
            _lua_log('change-format: formats failed: ' .. (err ~= '' and err or '(no details)'))
            mp.osd_message('Failed to load format list', 5)
            _uosc_open_list_picker(DOWNLOAD_FORMAT_MENU_TYPE, 'Change format', {
                {
                    title = 'Failed to load format list',
                    hint = 'Check logs (medeia-mpv-lua.log / medeia-mpv-helper.log)',
                    value = { 'script-message-to', mp.get_script_name(), 'medios-nop', '{}' },
                },
            })
            return
        end

        local tbl = resp.table
        if type(tbl.rows) ~= 'table' or #tbl.rows == 0 then
            mp.osd_message('No formats available', 4)
            return
        end

        local items = {}
        for idx, row in ipairs(tbl.rows) do
            local cols = row.columns or {}
            local id_val = ''
            local res_val = ''
            local ext_val = ''
            local size_val = ''
            for _, c in ipairs(cols) do
                if c.name == 'ID' then id_val = tostring(c.value or '') end
                if c.name == 'Resolution' then res_val = tostring(c.value or '') end
                if c.name == 'Ext' then ext_val = tostring(c.value or '') end
                if c.name == 'Size' then size_val = tostring(c.value or '') end
            end
            local label = id_val ~= '' and id_val or ('Format ' .. tostring(idx))
            local hint_parts = {}
            if res_val ~= '' and res_val ~= 'N/A' then table.insert(hint_parts, res_val) end
            if ext_val ~= '' then table.insert(hint_parts, ext_val) end
            if size_val ~= '' and size_val ~= 'N/A' then table.insert(hint_parts, size_val) end
            local hint = table.concat(hint_parts, ' | ')

            local payload = { index = idx }
            items[#items + 1] = {
                title = label,
                hint = hint,
                value = { 'script-message-to', mp.get_script_name(), 'medios-change-format-pick', utils.format_json(payload) },
            }
        end

        _pending_format_change.formats_table = tbl
        _cache_formats_for_url(url, tbl)
        _uosc_open_list_picker(DOWNLOAD_FORMAT_MENU_TYPE, 'Change format', items)
    end)
end)

-- Prefetch formats for yt-dlp-supported URLs on load so Change Format is instant.
mp.register_event('file-loaded', function()
    local target = _current_target()
    if not target or target == '' then
        return
    end
    local url = tostring(target)
    if not _is_http_url(url) then
        return
    end
    _prefetch_formats_for_url(url)
end)

mp.register_script_message('medios-change-format-pick', function(json)
    if type(_pending_format_change) ~= 'table' or not _pending_format_change.url then
        return
    end
    local ok, ev = pcall(utils.parse_json, json)
    if not ok or type(ev) ~= 'table' then
        return
    end
    local idx = tonumber(ev.index or 0) or 0
    if idx <= 0 then
        return
    end
    local tbl = _pending_format_change.formats_table
    if type(tbl) ~= 'table' or type(tbl.rows) ~= 'table' or not tbl.rows[idx] then
        return
    end
    local row = tbl.rows[idx]
    local sel = row.selection_args
    local fmt = nil
    if type(sel) == 'table' then
        for i = 1, #sel do
            if tostring(sel[i]) == '-format' and sel[i + 1] then
                fmt = tostring(sel[i + 1])
                break
            end
        end
    end
    if not fmt or fmt == '' then
        mp.osd_message('Invalid format selection', 3)
        return
    end

    local url = tostring(_pending_format_change.url)
    _pending_format_change = nil
    _apply_ytdl_format_and_reload(url, fmt)
end)

mp.register_script_message('medios-download-pick-store', function(json)
    if type(_pending_download) ~= 'table' or not _pending_download.url or not _pending_download.format then
        return
    end
    local ok, ev = pcall(utils.parse_json, json)
    if not ok or type(ev) ~= 'table' then
        return
    end
    local store = trim(tostring(ev.store or ''))
    if store == '' then
        return
    end

    local url = tostring(_pending_download.url)
    local fmt = tostring(_pending_download.format)

    local pipeline_cmd = 'download-media -url ' .. quote_pipeline_arg(url) .. ' -format ' .. quote_pipeline_arg(fmt)
        .. ' | add-file -store ' .. quote_pipeline_arg(store)

    if not _run_pipeline_detached(pipeline_cmd) then
        -- Fall back to synchronous execution if detached failed.
        M.run_pipeline(pipeline_cmd)
    end
    mp.osd_message('Download started', 3)
    _pending_download = nil
end)

mp.register_script_message('medios-download-pick-path', function()
    if type(_pending_download) ~= 'table' or not _pending_download.url or not _pending_download.format then
        return
    end
    if not _is_windows() then
        mp.osd_message('Folder picker is Windows-only', 4)
        return
    end

    local folder = _pick_folder_windows()
    if not folder or folder == '' then
        return
    end

    local url = tostring(_pending_download.url)
    local fmt = tostring(_pending_download.format)

    local pipeline_cmd = 'download-media -url ' .. quote_pipeline_arg(url) .. ' -format ' .. quote_pipeline_arg(fmt)
        .. ' | add-file -path ' .. quote_pipeline_arg(folder)

    if not _run_pipeline_detached(pipeline_cmd) then
        M.run_pipeline(pipeline_cmd)
    end
    mp.osd_message('Download started', 3)
    _pending_download = nil
end)

ensure_pipeline_helper_running = function()
    -- If a helper is already running (e.g. started by the launcher), just use it.
    if _is_pipeline_helper_ready() then
        _pipeline_helper_started = true
        return true
    end

    -- We tried to start a helper before but it isn't ready anymore; restart.
    if _pipeline_helper_started then
        _pipeline_helper_started = false
    end

    local helper_path = nil

    -- Prefer deriving repo root from located CLI.py if available.
    if opts and opts.cli_path and utils.file_info(opts.cli_path) then
        local root = tostring(opts.cli_path):match('(.*)[/\\]') or ''
        if root ~= '' then
            local candidate = utils.join_path(root, 'MPV/pipeline_helper.py')
            if utils.file_info(candidate) then
                helper_path = candidate
            end
        end
    end

    if not helper_path then
        local base_dir = mp.get_script_directory() or ""
        if base_dir == "" then
            base_dir = utils.getcwd() or ""
        end
        helper_path = find_file_upwards(base_dir, 'MPV/pipeline_helper.py', 8)
    end
    if not helper_path then
        _lua_log('ipc: cannot find helper script MPV/pipeline_helper.py (script_dir=' .. tostring(mp.get_script_directory() or '') .. ')')
        return false
    end

    -- Ensure mpv actually has a JSON IPC server for the helper to connect to.
    if not ensure_mpv_ipc_server() then
        _lua_log('ipc: mpv input-ipc-server is not set; start mpv with --input-ipc-server=\\\\.\\pipe\\mpv-medeia-macina')
        return false
    end

    local python = (opts and opts.python_path) and tostring(opts.python_path) or 'python'
    local ipc = get_mpv_ipc_path()
    -- Give the helper enough time to connect (Windows pipe can take a moment).
    local args = {python, helper_path, '--ipc', ipc, '--timeout', '30'}
    _lua_log('ipc: starting helper: ' .. table.concat(args, ' '))

    local ok = utils.subprocess_detached({ args = args })
    if ok == nil then
        _lua_log('ipc: failed to start helper (subprocess_detached returned nil)')
        return false
    end

    _pipeline_helper_started = true
    return true
end

local function run_pipeline_via_ipc(pipeline_cmd, seeds, timeout_seconds)
    if not ensure_pipeline_helper_running() then
        return nil
    end

    -- Avoid a race where we send the request before the helper has connected
    -- and installed its property observer, which would cause a timeout and
    -- force a noisy CLI fallback.
    do
        local deadline = mp.get_time() + 1.0
        while mp.get_time() < deadline do
            if _is_pipeline_helper_ready() then
                break
            end
            mp.wait_event(0.05)
        end
        if not _is_pipeline_helper_ready() then
            _pipeline_helper_started = false
            return nil
        end
    end

    local id = tostring(math.floor(mp.get_time() * 1000)) .. '-' .. tostring(math.random(100000, 999999))
    local req = { id = id, pipeline = pipeline_cmd }
    if seeds then
        req.seeds = seeds
    end

    -- Clear any previous response to reduce chances of reading stale data.
    mp.set_property(PIPELINE_RESP_PROP, '')
    mp.set_property(PIPELINE_REQ_PROP, utils.format_json(req))

    local deadline = mp.get_time() + (timeout_seconds or 5)
    while mp.get_time() < deadline do
        local resp_json = mp.get_property(PIPELINE_RESP_PROP)
        if resp_json and resp_json ~= '' then
            local ok, resp = pcall(utils.parse_json, resp_json)
            if ok and resp and resp.id == id then
                if resp.success then
                    return resp.stdout or ''
                end
                local details = ''
                if resp.error and tostring(resp.error) ~= '' then
                    details = tostring(resp.error)
                end
                if resp.stderr and tostring(resp.stderr) ~= '' then
                    if details ~= '' then
                        details = details .. "\n"
                    end
                    details = details .. tostring(resp.stderr)
                end
                local log_path = resp.log_path
                if log_path and tostring(log_path) ~= '' then
                    details = (details ~= '' and (details .. "\n") or '') .. 'Log: ' .. tostring(log_path)
                end
                return nil, (details ~= '' and details or 'unknown')
            end
        end
        mp.wait_event(0.05)
    end
    -- Helper may have crashed or never started; allow retry on next call.
    _pipeline_helper_started = false
    return nil
end

-- Detect CLI path
local function detect_script_dir()
    local dir = mp.get_script_directory()
    if dir and dir ~= "" then return dir end

    -- Fallback to debug info path
    local src = debug.getinfo(1, "S").source
    if src and src:sub(1, 1) == "@" then
        local path = src:sub(2)
        local parent = path:match("(.*)[/\\]")
        if parent and parent ~= "" then
            return parent
        end
    end

    -- Fallback to working directory
    local cwd = utils.getcwd()
    if cwd and cwd ~= "" then return cwd end
    return nil
end

local script_dir = detect_script_dir() or ""
if not opts.cli_path then
    -- Try to locate CLI.py by walking up from this script directory.
    -- Typical layout here is: <repo>/MPV/LUA/main.lua, and <repo>/CLI.py
    opts.cli_path = find_file_upwards(script_dir, "CLI.py", 6) or "CLI.py"
end

-- Helper to run pipeline
function M.run_pipeline(pipeline_cmd, seeds)
    local out, err = run_pipeline_via_ipc(pipeline_cmd, seeds, 5)
    if out ~= nil then
        return out
    end
    if err ~= nil then
        local log_path = write_temp_log('medeia-pipeline-error', tostring(err))
        local suffix = log_path and (' (log: ' .. log_path .. ')') or ''
        _lua_log('Pipeline error: ' .. tostring(err) .. suffix)
        mp.osd_message('Error: pipeline failed' .. suffix, 6)
        return nil
    end

    local args = {opts.python_path, opts.cli_path, "pipeline", "--pipeline", pipeline_cmd}
    
    if seeds then
        local seeds_json = utils.format_json(seeds)
        table.insert(args, "--seeds-json")
        table.insert(args, seeds_json)
    end

    _lua_log("Running pipeline: " .. pipeline_cmd)
    -- If the persistent IPC helper isn't available, fall back to a subprocess.
    -- Note: mpv's subprocess helper does not support an `env` parameter.
    local res = utils.subprocess({
        args = args,
        cancellable = false,
    })

    if res.status ~= 0 then
        local err = (res.stderr and res.stderr ~= "") and res.stderr
            or (res.error_string and res.error_string ~= "") and res.error_string
            or "unknown"
        local log_path = write_temp_log('medeia-cli-pipeline-stderr', tostring(res.stderr or err))
        local suffix = log_path and (' (log: ' .. log_path .. ')') or ''
        _lua_log("Pipeline error: " .. err .. suffix)
        mp.osd_message("Error: pipeline failed" .. suffix, 6)
        return nil
    end

    return res.stdout
end

-- Helper to run pipeline and parse JSON output
function M.run_pipeline_json(pipeline_cmd, seeds)
    -- Append | output-json if not present
    if not pipeline_cmd:match("output%-json$") then
        pipeline_cmd = pipeline_cmd .. " | output-json"
    end
    
    local output = M.run_pipeline(pipeline_cmd, seeds)
    if output then
        local ok, data = pcall(utils.parse_json, output)
        if ok then
            return data
        else
            _lua_log("Failed to parse JSON: " .. output)
            return nil
        end
    end
    return nil
end

-- Command: Get info for current file
function M.get_file_info()
    local path = mp.get_property("path")
    if not path then return end
    
    -- We can pass the path as a seed item
    local seed = {{path = path}}
    
    -- Run pipeline: get-metadata
    local data = M.run_pipeline_json("get-metadata", seed)
    
    if data then
        -- Display metadata
        _lua_log("Metadata: " .. utils.format_json(data))
        mp.osd_message("Metadata loaded (check console)", 3)
    end
end

-- Command: Delete current file
function M.delete_current_file()
    local path = mp.get_property("path")
    if not path then return end
    
    local seed = {{path = path}}
    
    M.run_pipeline("delete-file", seed)
    mp.osd_message("File deleted", 3)
    mp.command("playlist-next")
end

-- Command: Load a URL via pipeline (Ctrl+Enter in prompt)
function M.open_load_url_prompt()
    local menu_data = {
        type = LOAD_URL_MENU_TYPE,
        title = 'Load URL',
        search_style = 'palette',
        search_debounce = 'submit',
        on_search = 'callback',
        footnote = 'Paste/type URL, then Ctrl+Enter to load.',
        callback = {mp.get_script_name(), 'medios-load-url-event'},
        items = {},
    }

    local json = utils.format_json(menu_data)
    if ensure_uosc_loaded() then
        mp.commandv('script-message-to', 'uosc', 'open-menu', json)
    else
        _lua_log('menu: uosc not available; cannot open-menu')
    end
end

mp.register_script_message('medios-load-url', function()
    M.open_load_url_prompt()
end)

mp.register_script_message('medios-load-url-event', function(json)
    local ok, event = pcall(utils.parse_json, json)
    if not ok or type(event) ~= 'table' then
        return
    end
    if event.type ~= 'search' then
        return
    end

    local url = trim(tostring(event.query or ''))
    if url == '' then
        return
    end

    ensure_mpv_ipc_server()
    local out = M.run_pipeline('.pipe -url ' .. quote_pipeline_arg(url) .. ' -play')
    if out ~= nil then
        if ensure_uosc_loaded() then
            mp.commandv('script-message-to', 'uosc', 'close-menu', LOAD_URL_MENU_TYPE)
        else
            _lua_log('menu: uosc not available; cannot close-menu')
        end
    end
end)

-- Menu integration with UOSC
function M.show_menu()
    local menu_data = {
        title = "Medios Macina",
        items = {
            { title = "Get Metadata", value = "script-binding medios-info", hint = "Ctrl+i" },
            { title = "Delete File", value = "script-binding medios-delete", hint = "Ctrl+Del" },
            { title = "Load URL", value = {"script-message-to", mp.get_script_name(), "medios-load-url"} },
            { title = "Download", value = {"script-message-to", mp.get_script_name(), "medios-download-current"} },
            { title = "Change Format", value = {"script-message-to", mp.get_script_name(), "medios-change-format-current"} },
        }
    }
    
    local json = utils.format_json(menu_data)
    if ensure_uosc_loaded() then
        mp.commandv('script-message-to', 'uosc', 'open-menu', json)
    else
        _lua_log('menu: uosc not available; cannot open-menu')
    end
end

-- Keybindings
mp.add_key_binding("m", "medios-menu", M.show_menu)
mp.add_key_binding("mbtn_right", "medios-menu-right-click", M.show_menu)
mp.add_key_binding("ctrl+i", "medios-info", M.get_file_info)
mp.add_key_binding("ctrl+del", "medios-delete", M.delete_current_file)

-- Lyrics toggle (requested: 'L')
mp.add_key_binding("l", "medeia-lyric-toggle", lyric_toggle)
mp.add_key_binding("L", "medeia-lyric-toggle-shift", lyric_toggle)

-- Start the persistent pipeline helper eagerly at launch.
-- This avoids spawning Python per command and works cross-platform via MPV IPC.
mp.add_timeout(0, function()
    pcall(ensure_mpv_ipc_server)
    pcall(ensure_pipeline_helper_running)
    pcall(_lua_log, 'medeia-lua loaded version=' .. MEDEIA_LUA_VERSION)
end)

return M