from __future__ import annotations

from pathlib import Path
from typing import Any, Dict, List, Optional, Sequence
import sys
import tempfile
import re
import uuid
from urllib.parse import parse_qs, urlparse

from cmdlet._shared import Cmdlet, CmdletArg
from SYS.logger import log, debug
from SYS.result_table import ResultTable
from SYS import pipeline as ctx

_MATRIX_PENDING_ITEMS_KEY = "matrix_pending_items"
_MATRIX_PENDING_TEXT_KEY = "matrix_pending_text"


def _has_flag(args: Sequence[str], flag: str) -> bool:
    try:
        want = str(flag or "").strip().lower()
        if not want:
            return False
        return any(str(a).strip().lower() == want for a in (args or []))
    except Exception:
        return False


def _parse_config_room_filter_ids(config: Dict[str, Any]) -> List[str]:
    try:
        if not isinstance(config, dict):
            return []
        providers = config.get("provider")
        if not isinstance(providers, dict):
            return []
        matrix_conf = providers.get("matrix")
        if not isinstance(matrix_conf, dict):
            return []
        raw = None
        # Support a few common spellings; `room` is the documented key.
        for key in ("room", "room_id", "rooms", "room_ids"):
            if key in matrix_conf:
                raw = matrix_conf.get(key)
                break
        if raw is None:
            return []

        # Allow either a string or a list-like value.
        if isinstance(raw, (list, tuple, set)):
            items = [str(v).strip() for v in raw if str(v).strip()]
            return items

        text = str(raw or "").strip()
        if not text:
            return []
        # Comma-separated list of room IDs, but be tolerant of whitespace/newlines.
        items = [p.strip() for p in re.split(r"[,\s]+", text) if p and p.strip()]
        return items
    except Exception:
        return []


def _get_matrix_size_limit_bytes(config: Dict[str, Any]) -> Optional[int]:
    """Return max allowed per-file size in bytes for Matrix uploads.

    Config: [provider=Matrix] size_limit=50   # MB
    """
    try:
        if not isinstance(config, dict):
            return None
        providers = config.get("provider")
        if not isinstance(providers, dict):
            return None
        matrix_conf = providers.get("matrix")
        if not isinstance(matrix_conf, dict):
            return None

        raw = None
        for key in ("size_limit", "size_limit_mb", "max_mb"):
            if key in matrix_conf:
                raw = matrix_conf.get(key)
                break
        if raw is None:
            return None

        mb: Optional[float] = None
        if isinstance(raw, (int, float)):
            mb = float(raw)
        else:
            text = str(raw or "").strip().lower()
            if not text:
                return None
            m = re.fullmatch(r"(\d+(?:\.\d+)?)\s*(mb|mib|m)?", text)
            if not m:
                return None
            mb = float(m.group(1))

        if mb is None or mb <= 0:
            return None

        # Use MiB semantics for predictable limits.
        return int(mb * 1024 * 1024)
    except Exception:
        return None


def _room_id_matches_filter(room_id: str, allowed_ids_canon: set[str]) -> bool:
    rid = str(room_id or "").strip()
    if not rid or not allowed_ids_canon:
        return False

    rid_canon = rid.casefold()
    if rid_canon in allowed_ids_canon:
        return True

    # Allow matching when config omits the homeserver part: "!abc" matches "!abc:server".
    base = rid.split(":", 1)[0].strip().casefold()
    return bool(base) and base in allowed_ids_canon


def _extract_text_arg(args: Sequence[str]) -> str:
    """Extract a `-text <value>` argument from a cmdnat args list."""
    if not args:
        return ""
    try:
        tokens = list(args)
    except Exception:
        return ""
    for i, tok in enumerate(tokens):
        try:
            if str(tok).lower() == "-text" and i + 1 < len(tokens):
                return str(tokens[i + 1] or "").strip()
        except Exception:
            continue
    return ""


def _normalize_to_list(value: Any) -> List[Any]:
    if value is None:
        return []
    if isinstance(value, list):
        return value
    return [value]


def _extract_room_id(room_obj: Any) -> Optional[str]:
    try:
        # PipeObject stores unknown fields in .extra
        if hasattr(room_obj, "extra"):
            extra = getattr(room_obj, "extra")
            if isinstance(extra, dict):
                rid = extra.get("room_id")
                if isinstance(rid, str) and rid.strip():
                    return rid.strip()
        # Dict fallback
        if isinstance(room_obj, dict):
            rid = room_obj.get("room_id")
            if isinstance(rid, str) and rid.strip():
                return rid.strip()
    except Exception:
        pass
    return None


def _extract_file_path(item: Any) -> Optional[str]:
    """Best-effort local file path extraction.

    Returns a filesystem path string only if it exists.
    """

    def _maybe_local_path(value: Any) -> Optional[str]:
        if value is None:
            return None
        if isinstance(value, Path):
            candidate_path = value
        else:
            text = str(value).strip()
            if not text:
                return None
            # Treat URLs as not-local.
            if text.startswith("http://") or text.startswith("https://"):
                return None
            candidate_path = Path(text).expanduser()
        try:
            if candidate_path.exists():
                return str(candidate_path)
        except Exception:
            return None
        return None

    try:
        if hasattr(item, "path"):
            found = _maybe_local_path(getattr(item, "path"))
            if found:
                return found
        if hasattr(item, "file_path"):
            found = _maybe_local_path(getattr(item, "file_path"))
            if found:
                return found
        if isinstance(item, dict):
            for key in ("path", "file_path", "target"):
                found = _maybe_local_path(item.get(key))
                if found:
                    return found
    except Exception:
        pass
    return None


def _extract_url(item: Any) -> Optional[str]:
    try:
        if hasattr(item, "url"):
            raw = getattr(item, "url")
            if isinstance(raw, str) and raw.strip():
                return raw.strip()
            if isinstance(raw, (list, tuple)):
                for v in raw:
                    if isinstance(v, str) and v.strip():
                        return v.strip()
        if hasattr(item, "source_url"):
            raw = getattr(item, "source_url")
            if isinstance(raw, str) and raw.strip():
                return raw.strip()
        if isinstance(item, dict):
            for key in ("url", "source_url", "path", "target"):
                raw = item.get(key)
                if (isinstance(raw,
                               str) and raw.strip() and raw.strip().startswith(
                                   ("http://",
                                    "https://"))):
                    return raw.strip()
    except Exception:
        pass
    return None


_SHA256_RE = re.compile(r"^[0-9a-fA-F]{64}$")


def _extract_sha256_hex(item: Any) -> Optional[str]:
    try:
        if hasattr(item, "hash"):
            h = getattr(item, "hash")
            if isinstance(h, str) and _SHA256_RE.fullmatch(h.strip()):
                return h.strip().lower()
        if isinstance(item, dict):
            h = item.get("hash")
            if isinstance(h, str) and _SHA256_RE.fullmatch(h.strip()):
                return h.strip().lower()
    except Exception:
        pass
    return None


def _extract_hash_from_hydrus_file_url(url: str) -> Optional[str]:
    try:
        parsed = urlparse(url)
        if not (parsed.path or "").endswith("/get_files/file"):
            return None
        qs = parse_qs(parsed.query or "")
        h = (qs.get("hash") or [None])[0]
        if isinstance(h, str) and _SHA256_RE.fullmatch(h.strip()):
            return h.strip().lower()
    except Exception:
        pass
    return None


def _maybe_download_hydrus_file(item: Any,
                                config: Dict[str,
                                             Any],
                                output_dir: Path) -> Optional[str]:
    """If the item looks like a Hydrus file (hash + Hydrus URL), download it using Hydrus access key headers.

    This avoids 401 from Hydrus when the URL is /get_files/file?hash=... without headers.
    """
    try:
        from SYS.config import get_hydrus_access_key, get_hydrus_url
        from API.HydrusNetwork import HydrusNetwork as HydrusClient, download_hydrus_file

        # Prefer per-item Hydrus instance name when it matches a configured instance.
        store_name = None
        if isinstance(item, dict):
            store_name = item.get("store")
        else:
            store_name = getattr(item, "store", None)
        store_name = str(store_name).strip() if store_name else ""

        # Try the store name as instance key first; fallback to "home".
        instance_candidates = [s for s in [store_name.lower(), "home"] if s]
        hydrus_url = None
        access_key = None
        for inst in instance_candidates:
            access_key = (get_hydrus_access_key(config, inst) or "").strip() or None
            hydrus_url = (get_hydrus_url(config, inst) or "").strip() or None
            if access_key and hydrus_url:
                break

        if not access_key or not hydrus_url:
            return None

        url = _extract_url(item)
        file_hash = _extract_sha256_hex(item)
        if url and not file_hash:
            file_hash = _extract_hash_from_hydrus_file_url(url)

        # If it doesn't look like a Hydrus file, skip.
        if not file_hash:
            return None

        # Only treat it as Hydrus when we have a matching /get_files/file URL OR the item store suggests it.
        is_hydrus_url = False
        if url:
            parsed = urlparse(url)
            is_hydrus_url = (parsed.path or "").endswith(
                "/get_files/file"
            ) and _extract_hash_from_hydrus_file_url(url) == file_hash
        hydrus_instances: set[str] = set()
        try:
            store_cfg = (config
                         or {}).get("store") if isinstance(config,
                                                           dict) else None
            if isinstance(store_cfg, dict):
                hydrus_cfg = store_cfg.get("hydrusnetwork")
                if isinstance(hydrus_cfg, dict):
                    hydrus_instances = {
                        str(k).strip().lower()
                        for k in hydrus_cfg.keys() if str(k).strip()
                    }
        except Exception:
            hydrus_instances = set()

        store_hint = store_name.lower() in {
            "hydrus",
            "hydrusnetwork"
        } or (store_name.lower() in hydrus_instances)
        if not (is_hydrus_url or store_hint):
            return None

        client = HydrusClient(url=hydrus_url, access_key=access_key, timeout=30.0)
        file_url = url if (url and is_hydrus_url) else client.file_url(file_hash)

        # Best-effort extension from Hydrus metadata.
        suffix = ".hydrus"
        try:
            meta_response = client.fetch_file_metadata(
                hashes=[file_hash],
                include_mime=True
            )
            entries = meta_response.get("metadata"
                                        ) if isinstance(meta_response,
                                                        dict) else None
            if isinstance(entries, list) and entries:
                entry = entries[0]
                if isinstance(entry, dict):
                    ext = entry.get("ext")
                    if isinstance(ext, str) and ext.strip():
                        cleaned = ext.strip()
                        if not cleaned.startswith("."):
                            cleaned = "." + cleaned.lstrip(".")
                        if len(cleaned) <= 12:
                            suffix = cleaned
        except Exception:
            pass

        output_dir.mkdir(parents=True, exist_ok=True)
        dest = output_dir / f"{file_hash}{suffix}"
        if dest.exists():
            # Avoid clobbering; pick a unique name.
            dest = output_dir / f"{file_hash}_{uuid.uuid4().hex[:10]}{suffix}"

        headers = {
            "Hydrus-Client-API-Access-Key": access_key
        }
        download_hydrus_file(file_url, headers, dest, timeout=30.0)
        if dest.exists():
            return str(dest)
    except Exception as exc:
        debug(f"[matrix] Hydrus export failed: {exc}")
    return None


def _maybe_unlock_alldebrid_url(url: str, config: Dict[str, Any]) -> str:
    try:
        parsed = urlparse(url)
        host = (parsed.netloc or "").lower()
        if host != "alldebrid.com":
            return url
        if not (parsed.path or "").startswith("/f/"):
            return url

        try:
            from Provider.alldebrid import _get_debrid_api_key  # type: ignore

            api_key = _get_debrid_api_key(config or {})
        except Exception:
            api_key = None
        if not api_key:
            return url

        from API.alldebrid import AllDebridClient

        client = AllDebridClient(str(api_key))
        unlocked = client.unlock_link(url)
        if isinstance(unlocked, str) and unlocked.strip():
            return unlocked.strip()
    except Exception:
        pass
    return url


def _resolve_upload_path(item: Any, config: Dict[str, Any]) -> Optional[str]:
    """Resolve a usable local file path for uploading.

    - Prefer existing local file paths.
    - Otherwise, if the item has an http(s) URL, download it to a temp directory.
    """
    local = _extract_file_path(item)
    if local:
        return local

    # If this is a Hydrus-backed item (e.g. /get_files/file?hash=...), download it with Hydrus headers.
    try:
        base_tmp = None
        if isinstance(config, dict):
            base_tmp = config.get("temp")
        output_dir = (
            Path(str(base_tmp)).expanduser() if base_tmp else
            (Path(tempfile.gettempdir()) / "Medios-Macina")
        )
        output_dir = output_dir / "matrix" / "hydrus"
        hydrus_path = _maybe_download_hydrus_file(item, config, output_dir)
        if hydrus_path:
            return hydrus_path
    except Exception:
        pass

    url = _extract_url(item)
    if not url:
        return None

    # Best-effort: unlock AllDebrid file links (they require auth and aren't directly downloadable).
    url = _maybe_unlock_alldebrid_url(url, config)

    try:
        from SYS.download import _download_direct_file

        base_tmp = None
        if isinstance(config, dict):
            base_tmp = config.get("temp")
        output_dir = (
            Path(str(base_tmp)).expanduser() if base_tmp else
            (Path(tempfile.gettempdir()) / "Medios-Macina")
        )
        output_dir = output_dir / "matrix"
        output_dir.mkdir(parents=True, exist_ok=True)
        result = _download_direct_file(url, output_dir, quiet=True)
        if (result and hasattr(result,
                               "path") and isinstance(result.path,
                                                      Path) and result.path.exists()):
            return str(result.path)
    except Exception as exc:
        debug(f"[matrix] Failed to download URL for upload: {exc}")

    return None


def _run(result: Any, args: Sequence[str], config: Dict[str, Any]) -> int:
    # Internal stage: send previously selected items to selected rooms.
    if any(str(a).lower() == "-send" for a in (args or [])):
        # Ensure we don't re-print the rooms picker table on the send stage.
        try:
            if hasattr(ctx, "set_last_result_table_overlay"):
                ctx.set_last_result_table_overlay(None, None, None)
        except Exception:
            pass
        try:
            if hasattr(ctx, "set_current_stage_table"):
                ctx.set_current_stage_table(None)
        except Exception:
            pass

        rooms = _normalize_to_list(result)
        room_ids: List[str] = []
        for r in rooms:
            rid = _extract_room_id(r)
            if rid:
                room_ids.append(rid)
        if not room_ids:
            log("No Matrix room selected (use @N on the rooms table)", file=sys.stderr)
            return 1

        pending_items = ctx.load_value(_MATRIX_PENDING_ITEMS_KEY, default=[])
        items = _normalize_to_list(pending_items)
        if not items:
            log("No pending items to upload (use: @N | .matrix)", file=sys.stderr)
            return 1

        from Provider.matrix import Matrix

        try:
            provider = Matrix(config)
        except Exception as exc:
            log(f"Matrix not available: {exc}", file=sys.stderr)
            return 1

        text_value = _extract_text_arg(args)
        if not text_value:
            try:
                text_value = str(
                    ctx.load_value(_MATRIX_PENDING_TEXT_KEY,
                                   default="") or ""
                ).strip()
            except Exception:
                text_value = ""

        size_limit_bytes = _get_matrix_size_limit_bytes(config)
        size_limit_mb = (size_limit_bytes / (1024 * 1024)) if size_limit_bytes else None

        # Resolve upload paths once (also avoids repeated downloads when sending to multiple rooms).
        upload_jobs: List[Dict[str, Any]] = []
        any_failed = False
        for item in items:
            file_path = _resolve_upload_path(item, config)
            if not file_path:
                any_failed = True
                log(
                    "Matrix upload requires a local file (path) or a direct URL on the selected item",
                    file=sys.stderr,
                )
                continue

            media_path = Path(file_path)
            if not media_path.exists():
                any_failed = True
                log(f"Matrix upload file missing: {file_path}", file=sys.stderr)
                continue

            if size_limit_bytes is not None:
                try:
                    byte_size = int(media_path.stat().st_size)
                except Exception:
                    byte_size = -1
                if byte_size >= 0 and byte_size > size_limit_bytes:
                    any_failed = True
                    actual_mb = byte_size / (1024 * 1024)
                    lim = float(size_limit_mb or 0)
                    log(
                        f"ERROR: file is too big, skipping: {media_path.name} ({actual_mb:.1f} MB > {lim:.1f} MB)",
                        file=sys.stderr,
                    )
                    continue

            upload_jobs.append({
                "path": str(media_path),
                "pipe_obj": item
            })

        for rid in room_ids:
            sent_any_for_room = False
            for job in upload_jobs:
                file_path = str(job.get("path") or "")
                if not file_path:
                    continue
                try:
                    link = provider.upload_to_room(
                        file_path,
                        rid,
                        pipe_obj=job.get("pipe_obj")
                    )
                    debug(f"✓ Sent {Path(file_path).name} -> {rid}")
                    if link:
                        log(link)
                    sent_any_for_room = True
                except Exception as exc:
                    any_failed = True
                    log(
                        f"Matrix send failed for {Path(file_path).name}: {exc}",
                        file=sys.stderr
                    )

            # Optional caption-like follow-up message (sent once per room).
            if text_value and sent_any_for_room:
                try:
                    provider.send_text_to_room(text_value, rid)
                except Exception as exc:
                    any_failed = True
                    log(f"Matrix text send failed: {exc}", file=sys.stderr)

        # Clear pending items once we've attempted to send.
        ctx.store_value(_MATRIX_PENDING_ITEMS_KEY, [])
        try:
            ctx.store_value(_MATRIX_PENDING_TEXT_KEY, "")
        except Exception:
            pass
        return 1 if any_failed else 0

    # Default stage: show rooms, then wait for @N selection to resume sending.
    selected_items = _normalize_to_list(result)
    if not selected_items:
        log(
            "Usage: @N | .matrix  (select items first, then pick a room)",
            file=sys.stderr
        )
        return 1

    ctx.store_value(_MATRIX_PENDING_ITEMS_KEY, selected_items)
    try:
        ctx.store_value(_MATRIX_PENDING_TEXT_KEY, _extract_text_arg(args))
    except Exception:
        pass

    from Provider.matrix import Matrix

    try:
        provider = Matrix(config)
    except Exception as exc:
        log(f"Matrix not available: {exc}", file=sys.stderr)
        return 1

    try:
        configured_ids = None
        if not _has_flag(args, "-all"):
            ids = [
                str(v).strip() for v in _parse_config_room_filter_ids(config)
                if str(v).strip()
            ]
            if ids:
                configured_ids = ids

        rooms = provider.list_rooms(room_ids=configured_ids)
    except Exception as exc:
        log(f"Failed to list Matrix rooms: {exc}", file=sys.stderr)
        return 1

    # Diagnostics if a configured filter yields no rows (provider filtered before name lookups for speed).
    if not rooms and not _has_flag(args, "-all"):
        configured_ids_dbg = [
            str(v).strip() for v in _parse_config_room_filter_ids(config)
            if str(v).strip()
        ]
        if configured_ids_dbg:
            try:
                joined_ids = provider.list_joined_room_ids()
                debug(f"[matrix] Configured room filter IDs: {configured_ids_dbg}")
                debug(f"[matrix] Joined room IDs (from Matrix): {joined_ids}")
            except Exception:
                pass

    if not rooms:
        if _parse_config_room_filter_ids(config) and not _has_flag(args, "-all"):
            log(
                "No joined rooms matched the configured Matrix room filter (use: .matrix -all)",
                file=sys.stderr,
            )
        else:
            log("No joined rooms found.", file=sys.stderr)
        return 0

    table = ResultTable("Matrix Rooms (select with @N)")
    table.set_table("matrix")
    table.set_source_command(".matrix", [])

    for room in rooms:
        row = table.add_row()
        name = str(room.get("name") or "").strip() if isinstance(room, dict) else ""
        room_id = str(room.get("room_id") or ""
                      ).strip() if isinstance(room,
                                              dict) else ""
        row.add_column("Name", name)
        row.add_column("Room", room_id)

    # Make selection results clearer: stash a friendly title/store on the backing items.
    # This avoids confusion when the selection handler prints PipeObject debug info.
    room_items: List[Dict[str, Any]] = []
    for room in rooms:
        if not isinstance(room, dict):
            continue
        room_id = str(room.get("room_id") or "").strip()
        name = str(room.get("name") or "").strip()
        room_items.append(
            {
                **room,
                "store": "matrix",
                "title": name or room_id or "Matrix Room",
            }
        )

    # Overlay table: user selects @N, then we resume with `.matrix -send`.
    ctx.set_last_result_table_overlay(table, room_items)
    ctx.set_current_stage_table(table)
    ctx.set_pending_pipeline_tail([[".matrix", "-send"]], ".matrix")
    return 0


CMDLET = Cmdlet(
    name=".matrix",
    alias=["matrix",
           "rooms"],
    summary="Send selected items to a Matrix room",
    usage="@N | .matrix",
    arg=[
        CmdletArg(
            name="send",
            type="bool",
            description="(internal) Send to selected room(s)",
            required=False,
        ),
        CmdletArg(
            name="all",
            type="bool",
            description="Ignore config room filter and show all joined rooms",
            required=False,
        ),
        CmdletArg(
            name="text",
            type="string",
            description="Send a follow-up text message after each upload (caption-like)",
            required=False,
        ),
    ],
    exec=_run,
)