"""Delete-file cmdlet: Delete files from local storage and/or Hydrus."""
from __future__ import annotations

from typing import Any, Dict, Sequence
import sys
from pathlib import Path

from helper.logger import debug, log
from helper.store import Folder
from ._shared import Cmdlet, CmdletArg, normalize_hash, looks_like_hash, get_origin, get_field, should_show_help
from helper import hydrus as hydrus_wrapper
import pipeline as ctx


class Delete_File(Cmdlet):
    """Class-based delete-file cmdlet with self-registration."""

    def __init__(self) -> None:
        super().__init__(
            name="delete-file",
            summary="Delete a file locally and/or from Hydrus, including database entries.",
            usage="delete-file [-hash <sha256>] [-conserve <local|hydrus>] [-lib-root <path>] [reason]",
            alias=["del-file"],
            arg=[
                CmdletArg("hash", description="Override the Hydrus file hash (SHA256) to target instead of the selected result."),
                CmdletArg("conserve", description="Choose which copy to keep: 'local' or 'hydrus'."),
                CmdletArg("lib-root", description="Path to local library root for database cleanup."),
                CmdletArg("reason", description="Optional reason for deletion (free text)."),
            ],
            detail=[
                "Default removes both the local file and Hydrus file.",
                "Use -conserve local to keep the local file, or -conserve hydrus to keep it in Hydrus.",
                "Database entries are automatically cleaned up for local files.",
                "Any remaining arguments are treated as the Hydrus reason text.",
            ],
            exec=self.run,
        )
        self.register()

    def _process_single_item(self, item: Any, override_hash: str | None, conserve: str | None, 
                            lib_root: str | None, reason: str, config: Dict[str, Any]) -> bool:
        """Process deletion for a single item."""
        # Handle item as either dict or object
        if isinstance(item, dict):
            hash_hex_raw = item.get("hash_hex") or item.get("hash")
            target = item.get("target") or item.get("file_path") or item.get("path")
        else:
            hash_hex_raw = get_field(item, "hash_hex") or get_field(item, "hash")
            target = get_field(item, "target") or get_field(item, "file_path") or get_field(item, "path")
        
        origin = get_origin(item)
        
        # Also check the store field explicitly from PipeObject
        store = None
        if isinstance(item, dict):
            store = item.get("store")
        else:
            store = get_field(item, "store")
        
        # For Hydrus files, the target IS the hash
        if origin and origin.lower() == "hydrus" and not hash_hex_raw:
            hash_hex_raw = target

        hash_hex = normalize_hash(override_hash) if override_hash else normalize_hash(hash_hex_raw)

        local_deleted = False
        local_target = isinstance(target, str) and target.strip() and not str(target).lower().startswith(("http://", "https://"))
        
        if conserve != "local" and local_target:
            path = Path(str(target))
            
            # If lib_root is provided and this is from a folder store, use the Folder class
            if lib_root:
                try:
                    folder = Folder(Path(lib_root), name=origin or "local")
                    if folder.delete_file(str(path)):
                        local_deleted = True
                        ctx.emit(f"Removed file: {path.name}")
                        log(f"Deleted: {path.name}", file=sys.stderr)
                except Exception as exc:
                    debug(f"Folder.delete_file failed: {exc}", file=sys.stderr)
                    # Fallback to manual deletion
                    try:
                        if path.exists() and path.is_file():
                            path.unlink()
                            local_deleted = True
                            ctx.emit(f"Removed local file: {path}")
                            log(f"Deleted: {path.name}", file=sys.stderr)
                    except Exception as exc:
                        log(f"Local delete failed: {exc}", file=sys.stderr)
            else:
                # No lib_root, just delete the file
                try:
                    if path.exists() and path.is_file():
                        path.unlink()
                        local_deleted = True
                        ctx.emit(f"Removed local file: {path}")
                        log(f"Deleted: {path.name}", file=sys.stderr)
                except Exception as exc:
                    log(f"Local delete failed: {exc}", file=sys.stderr)
            
            # Remove common sidecars regardless of file removal success
            for sidecar in (path.with_suffix(".tags"), path.with_suffix(".tags.txt"), 
                           path.with_suffix(".metadata"), path.with_suffix(".notes")):
                try:
                    if sidecar.exists() and sidecar.is_file():
                        sidecar.unlink()
                except Exception:
                    pass

        hydrus_deleted = False
        # Only attempt Hydrus deletion if store is explicitly Hydrus-related
        # Check both origin and store fields to determine if this is a Hydrus file
        
        should_try_hydrus = False
        
        # Check if store indicates this is a Hydrus backend
        if store and ("hydrus" in store.lower() or store.lower() == "home" or store.lower() == "work"):
            should_try_hydrus = True
        # Fallback to origin check if store not available
        elif origin and origin.lower() == "hydrus":
            should_try_hydrus = True
        
        # If conserve is set to hydrus, definitely don't delete
        if conserve == "hydrus":
            should_try_hydrus = False
            
        if should_try_hydrus and hash_hex:
            try:
                client = hydrus_wrapper.get_client(config)
            except Exception as exc:
                if not local_deleted:
                    log(f"Hydrus client unavailable: {exc}", file=sys.stderr)
                    return False
            else:
                if client is None:
                    if not local_deleted:
                        log("Hydrus client unavailable", file=sys.stderr)
                        return False
                else:
                    payload: Dict[str, Any] = {"hashes": [hash_hex]}
                    if reason:
                        payload["reason"] = reason
                    try:
                        client._post("/add_files/delete_files", data=payload)  # type: ignore[attr-defined]
                        hydrus_deleted = True
                        preview = hash_hex[:12] + ('…' if len(hash_hex) > 12 else '')
                        debug(f"Deleted from Hydrus: {preview}…", file=sys.stderr)
                    except Exception as exc:
                        # If it's not in Hydrus (e.g. 404 or similar), that's fine
                        if not local_deleted:
                            return False

        if hydrus_deleted and hash_hex:
            preview = hash_hex[:12] + ('…' if len(hash_hex) > 12 else '')
            if reason:
                ctx.emit(f"Deleted {preview} (reason: {reason}).")
            else:
                ctx.emit(f"Deleted {preview}.")

        if hydrus_deleted or local_deleted:
            return True

        log("Selected result has neither Hydrus hash nor local file target")
        return False

    def run(self, result: Any, args: Sequence[str], config: Dict[str, Any]) -> int:
        """Execute delete-file command."""
        if should_show_help(args):
            log(f"Cmdlet: {self.name}\nSummary: {self.summary}\nUsage: {self.usage}")
            return 0

        # Parse arguments
        override_hash: str | None = None
        conserve: str | None = None
        lib_root: str | None = None
        reason_tokens: list[str] = []
        i = 0
        
        while i < len(args):
            token = args[i]
            low = str(token).lower()
            if low in {"-hash", "--hash", "hash"} and i + 1 < len(args):
                override_hash = str(args[i + 1]).strip()
                i += 2
                continue
            if low in {"-conserve", "--conserve"} and i + 1 < len(args):
                value = str(args[i + 1]).strip().lower()
                if value in {"local", "hydrus"}:
                    conserve = value
                    i += 2
                    continue
            if low in {"-lib-root", "--lib-root", "lib-root"} and i + 1 < len(args):
                lib_root = str(args[i + 1]).strip()
                i += 2
                continue
            reason_tokens.append(token)
            i += 1

        # If no lib_root provided, try to get the first folder store from config
        if not lib_root:
            try:
                storage_config = config.get("storage", {})
                folder_config = storage_config.get("folder", {})
                if folder_config:
                    # Get first folder store path
                    for store_name, store_config in folder_config.items():
                        if isinstance(store_config, dict):
                            path = store_config.get("path")
                            if path:
                                lib_root = path
                                break
            except Exception:
                pass

        reason = " ".join(token for token in reason_tokens if str(token).strip()).strip()

        items = []
        if isinstance(result, list):
            items = result
        elif result:
            items = [result]
        
        if not items:
            log("No items to delete", file=sys.stderr)
            return 1

        success_count = 0
        for item in items:
            if self._process_single_item(item, override_hash, conserve, lib_root, reason, config):
                success_count += 1

        if success_count > 0:
            # Clear cached tables/items so deleted entries are not redisplayed
            try:
                ctx.set_last_result_table_overlay(None, None, None)
                ctx.set_last_result_table(None, [])
                ctx.set_last_result_items_only([])
                ctx.set_current_stage_table(None)
            except Exception:
                pass

        return 0 if success_count > 0 else 1


# Instantiate and register the cmdlet
Delete_File()