"""
Contains all the folder routes.
"""

import os
import pathlib
from datetime import datetime
from dataclasses import replace
from pathlib import Path

import psutil
from flask_openapi3 import APIBlueprint, Tag
from pydantic import BaseModel, Field
from showinfm import show_in_file_manager

from swingmusic import settings
from swingmusic.api.auth import admin_required
from swingmusic.config import UserConfig
from swingmusic.db.libdata import TrackTable
from swingmusic.db.userdata import FavoritesTable, PlaylistTable
from swingmusic.lib.folderslib import get_files_and_dirs, get_folders
from swingmusic.serializers.track import serialize_track, serialize_tracks
from swingmusic.services.user_library_scope import (
    count_visible_tracks_in_paths,
    get_available_trackhashes,
    get_user_root_dirs,
    is_path_within_user_roots,
)
from swingmusic.store.tracks import TrackStore
from swingmusic.utils.auth import get_current_userid
from swingmusic.utils.wintools import is_windows

tag = Tag(name="Folders", description="Get folders and tracks in a directory")
api = APIBlueprint("folder", __name__, url_prefix="/folder", abp_tags=[tag])


def is_path_within_root_dirs(filepath: str, userid: int | None = None) -> bool:
    """
    Check if a filepath is within one of the configured root directories.
    Prevents directory traversal attacks.
    """
    return is_path_within_user_roots(filepath, userid=userid)


class FolderTree(BaseModel):
    folder: str = Field("$home", description="The folder to things from")
    sorttracksby: str = Field(
        "default",
        description="""The field to sort tracks by. Options: [
            "default",
            "album",
            "albumartists",
            "artists",
            "bitrate",
            "date",
            "disc",
            "duration",
            "last_mod",
            "lastplayed",
            "playduration",
            "playcount",
            "title",
        ]""",
    )
    tracksort_reverse: bool = Field(
        False,
        description="Whether to reverse the sort order of the tracks",
    )
    sortfoldersby: str = Field(
        "lastmod",
        description="""The field to sort folders by.
        Options: [
            "default",
            "name",
            "lastmod",
            "trackcount",
        ]
        """,
    )
    foldersort_reverse: bool = Field(
        False,
        description="Whether to reverse the sort order of the folders",
    )
    start: int = Field(0, description="The start index")
    limit: int = Field(50, description="The max number of items to return")
    tracks_only: bool = Field(False, description="Whether to only get tracks")


@api.post("")
def get_folder_tree(body: FolderTree):
    """
    Get folder

    Returns a list of all the folders and tracks in the given folder.
    """
    userid = get_current_userid()
    og_req_dir = body.folder
    req_dir = body.folder
    tracks_only = body.tracks_only

    config = UserConfig()
    root_dirs = get_user_root_dirs(userid)

    if req_dir == "$home" and "$home" in root_dirs:
        req_dir = settings.Paths().USER_HOME_DIR.as_posix()

    if req_dir == "$home":
        folders = get_folders(root_dirs)
        folder_paths = [folder.path for folder in folders]
        user_counts = count_visible_tracks_in_paths(folder_paths, userid=userid)
        visible_folders = []
        for folder in folders:
            key = Path(folder.path).resolve().as_posix().rstrip("/")
            visible_folders.append(replace(folder, trackcount=user_counts.get(key, 0)))

        return {
            "folders": visible_folders,
            "tracks": [],
            "path": req_dir,
            "total": 0,
        }

    if req_dir.startswith("$playlist"):
        splits = req_dir.split("/")

        if len(splits) == 2:
            pid = splits[1]
            playlist = PlaylistTable.get_by_id(int(pid))
            available_trackhashes = get_available_trackhashes(userid)
            tracks = TrackStore.get_tracks_by_trackhashes(
                playlist.trackhashes[
                    body.start : body.start + body.limit if body.limit != -1 else None
                ]
            )
            tracks = [
                track for track in tracks if track.trackhash in available_trackhashes
            ]

            return {
                "path": f"$playlist/{playlist.name}",
                "folders": [],
                "tracks": serialize_tracks(tracks),
            }

        playlists = PlaylistTable.get_all()
        playlists = sorted(
            playlists,
            key=lambda p: datetime.strptime(p.last_updated, "%Y-%m-%d %H:%M:%S"),
            reverse=True,
        )
        available_trackhashes = get_available_trackhashes(userid)

        return {
            "path": req_dir,
            "folders": [
                {
                    "name": p.name,
                    "path": f"$playlist/{p.id}",
                    "trackcount": len(
                        [
                            trackhash
                            for trackhash in p.trackhashes
                            if trackhash in available_trackhashes
                        ]
                    ),
                }
                for p in playlists
            ],
            "tracks": [],
        }

    if req_dir == "$favorites":
        tracks, total = FavoritesTable.get_fav_tracks(body.start, body.limit)
        available_trackhashes = get_available_trackhashes(userid)
        tracks = TrackStore.get_tracks_by_trackhashes(
            [t.hash for t in tracks if t.hash in available_trackhashes]
        )

        return {
            "tracks": serialize_tracks(tracks),
            "folders": [],
            "path": req_dir,
        }

    # Resolve path to prevent directory traversal attacks
    resolved_path = pathlib.Path(req_dir).resolve()

    # Validate path is within configured root directories
    if not is_path_within_root_dirs(str(resolved_path), userid=userid):
        return {
            "folders": [],
            "tracks": [],
            "error": "Path not within allowed directories",
        }, 403

    if not resolved_path.exists() or not resolved_path.is_dir():
        return {
            "folders": [],
            "tracks": [],
            "error": "Invalid directory",
        }, 400

    results = get_files_and_dirs(
        resolved_path,
        start=body.start,
        limit=body.limit,
        tracks_only=tracks_only,
        tracksortby=body.sorttracksby,
        foldersortby=body.sortfoldersby,
        tracksort_reverse=body.tracksort_reverse,
        foldersort_reverse=body.foldersort_reverse,
    )

    # Enforce per-user projection on file-backed track results.
    available_trackhashes = get_available_trackhashes(userid)
    results["tracks"] = [
        track
        for track in results.get("tracks", [])
        if track.get("trackhash") in available_trackhashes
    ]

    # Recompute folder counts from visible tracks only for this user.
    folder_paths = [folder.path for folder in results.get("folders", [])]
    user_counts = count_visible_tracks_in_paths(folder_paths, userid=userid)
    visible_folders = []
    for folder in results.get("folders", []):
        key = Path(folder.path).resolve().as_posix().rstrip("/")
        visible_folders.append(replace(folder, trackcount=user_counts.get(key, 0)))
    results["folders"] = visible_folders

    if og_req_dir == "$home" and config.showPlaylistsInFolderView:
        # Get all playlists and return them as a list of folders
        playlists_item = {
            "name": "Playlists",
            "path": "$playlists",
            "trackcount": sum(p.count for p in PlaylistTable.get_all()),
        }

        favorites_item = {
            "name": "Favorites",
            "path": "$favorites",
            "trackcount": FavoritesTable.get_fav_tracks(0, -1)[1],
        }

        results["folders"].insert(0, playlists_item)
        results["folders"].insert(0, favorites_item)

    return results


def get_all_drives(is_win: bool = False):
    """
    Returns a list of all the drives on a Windows machine.
    """
    drives_ = psutil.disk_partitions(all=True)
    drives = [Path(d.mountpoint).as_posix() for d in drives_]

    if is_win:
        return drives
    else:
        remove = (
            "/boot",
            "/tmp",
            "/snap",
            "/var",
            "/sys",
            "/proc",
            "/etc",
            "/run",
            "/dev",
        )
        drives = [d for d in drives if not d.startswith(remove)]

    return drives


class DirBrowserBody(BaseModel):
    folder: str = Field(
        "$root",
        description="The folder to list directories from",
    )


@api.post("/dir-browser")
@admin_required()
def list_folders(body: DirBrowserBody):
    """
    List folders

    Returns a list of all the folders in the given folder.
    Used when selecting root dirs. Admin only.
    """
    req_dir = body.folder
    is_win = is_windows()

    if req_dir == "$root":
        return {
            "folders": [{"name": d, "path": d} for d in get_all_drives(is_win=is_win)]
        }

    # Resolve path to prevent directory traversal attacks
    req_dir = pathlib.Path(req_dir).resolve()

    if not req_dir.exists() or not req_dir.is_dir():
        return {"folders": [], "error": "Invalid directory"}, 400

    try:
        entries = os.scandir(req_dir)
    except PermissionError:
        return {"folders": []}

    # only get dirs and remove hidden dirs
    dirs = []
    for entry in entries:
        entry = pathlib.Path(entry)
        name = entry.name

        if name.startswith("$"):
            continue

        if name.startswith("."):
            continue

        if entry.is_dir():
            dirs.append({"name": name, "path": entry.resolve().as_posix()})

    return {
        "folders": sorted(dirs, key=lambda i: i["name"]),
    }


class FolderOpenInFileManagerQuery(BaseModel):
    path: str = Field(
        description="The path to open in the file manager",
    )


@api.get("/show-in-files")
def open_in_file_manager(query: FolderOpenInFileManagerQuery):
    """
    Open in file manager

    Opens the given path in the file manager on the host machine.
    Path must be within configured root directories.
    """
    # Resolve path to prevent directory traversal
    resolved_path = Path(query.path).resolve()

    # Validate path is within root directories
    userid = get_current_userid()
    if not is_path_within_root_dirs(query.path, userid=userid):
        return {"success": False, "error": "Path not within allowed directories"}, 403

    if not resolved_path.exists():
        return {"success": False, "error": "Path does not exist"}, 404

    show_in_file_manager(str(resolved_path))

    return {"success": True}


class GetTracksInPathQuery(BaseModel):
    path: str = Field(
        description="The path to get tracks from",
    )


@api.get("/tracks/all")
def get_tracks_in_path(query: GetTracksInPathQuery):
    """
    Get tracks in path

    Gets all (or a max of 300) tracks from the given path and its subdirectories.

    Used when adding tracks to the queue.
    """
    userid = get_current_userid()
    # Resolve path to prevent directory traversal
    resolved_path = Path(query.path).resolve()

    # Validate path is within root directories
    if not is_path_within_root_dirs(str(resolved_path), userid=userid):
        return {"tracks": [], "error": "Path not within allowed directories"}, 403

    available_trackhashes = get_available_trackhashes(userid)
    tracks = TrackTable.get_tracks_in_path(str(resolved_path))
    tracks = (
        serialize_track(t)
        for t in tracks
        if Path(t.filepath).exists() and t.trackhash in available_trackhashes
    )

    return {
        "tracks": list(tracks)[:300],
    }