from __future__ import annotations

import glob
import json
import logging
import os
import re
import shutil
import uuid
import tempfile
import mimetypes
from typing import TypedDict
from urllib import parse

from aiohttp import web

from .app_settings import AppSettings
from ..cli_args import args
from ..cmd import folder_paths

default_user = "default"

logger = logging.getLogger(__name__)

class FileInfo(TypedDict):
    path: str
    size: int
    modified: float
    created: int


def get_file_info(path: str, relative_to: str) -> FileInfo:
    return {
        "path": os.path.relpath(path, relative_to).replace(os.sep, '/'),
        "size": os.path.getsize(path),
        "modified": int(os.path.getmtime(path) * 1000),
        "created": int(os.path.getctime(path) * 1000),
    }


class UserManager():
    def __init__(self):
        user_directory = folder_paths.get_user_directory()

        self.settings = AppSettings(self)
        if not os.path.exists(user_directory):
            os.makedirs(user_directory, exist_ok=True)

        if args.multi_user:
            if os.path.isfile(self.get_users_file()):
                with open(self.get_users_file()) as f:
                    self.users = json.load(f)
            else:
                self.users = {}
        else:
            self.users = {"default": "default"}

    def get_users_file(self):
        return os.path.join(folder_paths.get_user_directory(), "users.json")

    def get_request_user_id(self, request):
        user = "default"
        if args.multi_user and "comfy-user" in request.headers:
            user = request.headers["comfy-user"]
            # Block System Users (use same error message to prevent probing)
            if user.startswith(folder_paths.SYSTEM_USER_PREFIX):
                raise KeyError("Unknown user: " + user)

        if user not in self.users:
            raise KeyError("Unknown user: " + user)

        return user

    def get_request_user_filepath(self, request, file, type="userdata", create_dir=True):
        if type == "userdata":
            root_dir = folder_paths.get_user_directory()
        else:
            raise KeyError("Unknown filepath type:" + type)

        user = self.get_request_user_id(request)
        user_root = folder_paths.get_public_user_directory(user)
        if user_root is None:
            return None
        path = user_root

        # prevent leaving /{type}
        if os.path.commonpath((root_dir, user_root)) != root_dir:
            return None

        if file is not None:
            # Check if filename is url encoded
            if "%" in file:
                file = parse.unquote(file)

            # prevent leaving /{type}/{user}
            path = os.path.abspath(os.path.join(user_root, file))
            if os.path.commonpath((user_root, path)) != user_root:
                return None

        parent = os.path.split(path)[0]

        if create_dir and not os.path.exists(parent):
            os.makedirs(parent, exist_ok=True)

        return path

    def add_user(self, name):
        name = name.strip()
        if not name:
            raise ValueError("username not provided")
        if name.startswith(folder_paths.SYSTEM_USER_PREFIX):
            raise ValueError("System User prefix not allowed")
        user_id = re.sub("[^a-zA-Z0-9-_]+", '-', name)
        if user_id.startswith(folder_paths.SYSTEM_USER_PREFIX):
            raise ValueError("System User prefix not allowed")
        user_id = user_id + "_" + str(uuid.uuid4())

        self.users[user_id] = name

        with open(self.get_users_file(), "w") as f:
            json.dump(self.users, f)

        return user_id

    def add_routes(self, routes):
        self.settings.add_routes(routes)

        @routes.get("/users")
        async def get_users(request):
            if args.multi_user:
                return web.json_response({"storage": "server", "users": self.users})
            else:
                user_dir = self.get_request_user_filepath(request, None, create_dir=False)
                return web.json_response({
                    "storage": "server",
                    "migrated": os.path.exists(user_dir)
                })

        @routes.post("/users")
        async def post_users(request):
            body = await request.json()
            username = body["username"]
            if username in self.users.values():
                return web.json_response({"error": "Duplicate username."}, status=400)

            try:
                user_id = self.add_user(username)
            except ValueError as e:
                return web.json_response({"error": str(e)}, status=400)
            return web.json_response(user_id)

        @routes.get("/userdata")
        async def listuserdata(request):
            """
            List user data files in a specified directory.

            This endpoint allows listing files in a user's data directory, with options for recursion,
            full file information, and path splitting.

            Query Parameters:
            - dir (required): The directory to list files from.
            - recurse (optional): If "true", recursively list files in subdirectories.
            - full_info (optional): If "true", return detailed file information (path, size, modified time).
            - split (optional): If "true", split file paths into components (only applies when full_info is false).

            Returns:
            - 400: If 'dir' parameter is missing.
            - 403: If the requested path is not allowed.
            - 404: If the requested directory does not exist.
            - 200: JSON response with the list of files or file information.

            The response format depends on the query parameters:
            - Default: List of relative file paths.
            - full_info=true: List of dictionaries with file details.
            - split=true (and full_info=false): List of lists, each containing path components.
            """
            directory = request.rel_url.query.get('dir', '')
            if not directory:
                return web.Response(status=400, text="Directory not provided")

            path = self.get_request_user_filepath(request, directory)
            if not path:
                return web.Response(status=403, text="Invalid directory")

            if not os.path.exists(path):
                return web.Response(status=404, text="Directory not found")

            recurse = request.rel_url.query.get('recurse', '').lower() == "true"
            full_info = request.rel_url.query.get('full_info', '').lower() == "true"
            split_path = request.rel_url.query.get('split', '').lower() == "true"

            # Use different patterns based on whether we're recursing or not
            if recurse:
                pattern = os.path.join(glob.escape(path), '**', '*')
            else:
                pattern = os.path.join(glob.escape(path), '*')

            def process_full_path(full_path: str) -> FileInfo | str | list[str]:
                if full_info:
                    return get_file_info(full_path, path)

                rel_path = os.path.relpath(full_path, path).replace(os.sep, '/')
                if split_path:
                    return [rel_path] + rel_path.split('/')

                return rel_path

            results = [
                process_full_path(full_path)
                for full_path in glob.glob(pattern, recursive=recurse)
                if os.path.isfile(full_path)
            ]

            return web.json_response(results)

        @routes.get("/v2/userdata")
        async def list_userdata_v2(request):
            """
            List files and directories in a user's data directory.

            This endpoint provides a structured listing of contents within a specified
            subdirectory of the user's data storage.

            Query Parameters:
            - path (optional): The relative path within the user's data directory
                               to list. Defaults to the root ('').

            Returns:
            - 400: If the requested path is invalid, outside the user's data directory, or is not a directory.
            - 404: If the requested path does not exist.
            - 403: If the user is invalid.
            - 500: If there is an error reading the directory contents.
            - 200: JSON response containing a list of file and directory objects.
                   Each object includes:
                   - name: The name of the file or directory.
                   - type: 'file' or 'directory'.
                   - path: The relative path from the user's data root.
                   - size (for files): The size in bytes.
                   - modified (for files): The last modified timestamp (Unix epoch).
            """
            requested_rel_path = request.rel_url.query.get('path', '')

            # URL-decode the path parameter
            try:
                requested_rel_path = parse.unquote(requested_rel_path)
            except Exception as e:
                logger.warning(f"Failed to decode path parameter: {requested_rel_path}, Error: {e}")
                return web.Response(status=400, text="Invalid characters in path parameter")


            # Check user validity and get the absolute path for the requested directory
            try:
                 base_user_path = self.get_request_user_filepath(request, None, create_dir=False)

                 if requested_rel_path:
                     target_abs_path = self.get_request_user_filepath(request, requested_rel_path, create_dir=False)
                 else:
                     target_abs_path = base_user_path

            except KeyError as e:
                 # Invalid user detected by get_request_user_id inside get_request_user_filepath
                 logger.warning(f"Access denied for user: {e}")
                 return web.Response(status=403, text="Invalid user specified in request")


            if not target_abs_path:
                 # Path traversal or other issue detected by get_request_user_filepath
                 return web.Response(status=400, text="Invalid path requested")

            # Handle cases where the user directory or target path doesn't exist
            if not os.path.exists(target_abs_path):
                # Check if it's the base user directory that's missing (new user case)
                if target_abs_path == base_user_path:
                    # It's okay if the base user directory doesn't exist yet, return empty list
                     return web.json_response([])
                else:
                    # A specific subdirectory was requested but doesn't exist
                     return web.Response(status=404, text="Requested path not found")

            if not os.path.isdir(target_abs_path):
                 return web.Response(status=400, text="Requested path is not a directory")

            results = []
            try:
                for root, dirs, files in os.walk(target_abs_path, topdown=True):
                    # Process directories
                    for dir_name in dirs:
                        dir_path = os.path.join(root, dir_name)
                        rel_path = os.path.relpath(dir_path, base_user_path).replace(os.sep, '/')
                        results.append({
                            "name": dir_name,
                            "path": rel_path,
                            "type": "directory"
                        })

                    # Process files
                    for file_name in files:
                        file_path = os.path.join(root, file_name)
                        rel_path = os.path.relpath(file_path, base_user_path).replace(os.sep, '/')
                        entry_info = {
                            "name": file_name,
                            "path": rel_path,
                            "type": "file"
                        }
                        try:
                            stats = os.stat(file_path) # Use os.stat for potentially better performance with os.walk
                            entry_info["size"] = stats.st_size
                            entry_info["modified"] = stats.st_mtime
                        except OSError as stat_error:
                            logger.warning(f"Could not stat file {file_path}: {stat_error}")
                            pass # Include file with available info
                        results.append(entry_info)
            except OSError as e:
                logger.error(f"Error listing directory {target_abs_path}: {e}")
                return web.Response(status=500, text="Error reading directory contents")

            # Sort results alphabetically, directories first then files
            results.sort(key=lambda x: (x['type'] != 'directory', x['name'].lower()))

            return web.json_response(results)

        def get_user_data_path(request, check_exists=False, param="file"):
            file = request.match_info.get(param, None)
            if not file:
                return web.Response(status=400)

            try:
                path = self.get_request_user_filepath(request, file)
            except KeyError as e:
                logger.warning(f"Access denied for user: {e}")
                return web.Response(status=403, text="Invalid user specified in request")
            if not path:
                return web.Response(status=403)

            if check_exists and not os.path.exists(path):
                return web.Response(status=404)

            return path

        @routes.get("/userdata/{file}")
        async def getuserdata(request):
            path = get_user_data_path(request, check_exists=True)
            if not isinstance(path, str):
                return path

            # User data files are arbitrary user-supplied content and are never
            # meant to render inline. Disable MIME sniffing and force a download
            # so uploaded markup/scripts can't execute in the app origin (stored
            # XSS). Content-Disposition: attachment is the load-bearing guard;
            # the content-type override and nosniff are defence in depth.
            content_type = mimetypes.guess_type(path)[0] or 'application/octet-stream'

            user_root = self.get_request_user_filepath(request, None, create_dir=False)
            is_user_css = path == os.path.abspath(os.path.join(user_root, "user.css"))

            if is_user_css:
                content_type = "text/css"
                disposition = "inline"
            else:
                if folder_paths.is_dangerous_content_type(content_type):
                    content_type = 'application/octet-stream'
                disposition = "attachment"

            return web.FileResponse(path, headers={
                "Content-Type": content_type,
                "X-Content-Type-Options": "nosniff",
                "Content-Disposition": disposition,
            })

        @routes.post("/userdata/{file}")
        async def post_userdata(request):
            """
            Upload or update a user data file.

            This endpoint handles file uploads to a user's data directory, with options for
            controlling overwrite behavior and response format.

            Query Parameters:
            - overwrite (optional): If "false", prevents overwriting existing files. Defaults to "true".
            - full_info (optional): If "true", returns detailed file information (path, size, modified time).
                                  If "false", returns only the relative file path.

            Path Parameters:
            - file: The target file path (URL encoded if necessary).

            Returns:
            - 400: If 'file' parameter is missing.
            - 403: If the requested path is not allowed.
            - 409: If overwrite=false and the file already exists.
            - 200: JSON response with either:
                  - Full file information (if full_info=true)
                  - Relative file path (if full_info=false)

            The request body should contain the raw file content to be written.
            """
            path = get_user_data_path(request)
            if not isinstance(path, str):
                return path

            overwrite = request.query.get("overwrite", 'true') != "false"
            full_info = request.query.get('full_info', 'false').lower() == "true"

            if not overwrite and os.path.exists(path):
                return web.Response(status=409, text="File already exists")

            try:
                body = await request.read()

                dir_name = os.path.dirname(path)
                fd, tmp_path = tempfile.mkstemp(dir=dir_name)
                try:
                    with os.fdopen(fd, "wb") as f:
                        f.write(body)
                    os.replace(tmp_path, path)
                except:
                    os.unlink(tmp_path)
                    raise
            except OSError as e:
                logger.warning(f"Error saving file '{path}': {e}")
                return web.Response(
                    status=400,
                    reason="Invalid filename. Please avoid special characters like :\\/*?\"<>|"
                )

            user_path = self.get_request_user_filepath(request, None)
            if full_info:
                resp = get_file_info(path, user_path)
            else:
                resp = os.path.relpath(path, user_path)

            return web.json_response(resp)

        @routes.delete("/userdata/{file}")
        async def delete_userdata(request):
            path = get_user_data_path(request, check_exists=True)
            if not isinstance(path, str):
                return path

            os.remove(path)

            return web.Response(status=204)

        @routes.post("/userdata/{file}/move/{dest}")
        async def move_userdata(request):
            """
            Move or rename a user data file.

            This endpoint handles moving or renaming files within a user's data directory, with options for
            controlling overwrite behavior and response format.

            Path Parameters:
            - file: The source file path (URL encoded if necessary)
            - dest: The destination file path (URL encoded if necessary)

            Query Parameters:
            - overwrite (optional): If "false", prevents overwriting existing files. Defaults to "true".
            - full_info (optional): If "true", returns detailed file information (path, size, modified time).
                                  If "false", returns only the relative file path.

            Returns:
            - 400: If either 'file' or 'dest' parameter is missing
            - 403: If either requested path is not allowed
            - 404: If the source file does not exist
            - 409: If overwrite=false and the destination file already exists
            - 200: JSON response with either:
                  - Full file information (if full_info=true)
                  - Relative file path (if full_info=false)
            """
            source = get_user_data_path(request, check_exists=True)
            if not isinstance(source, str):
                return source

            dest = get_user_data_path(request, check_exists=False, param="dest")
            if not isinstance(dest, str):
                return dest

            overwrite = request.query.get("overwrite", 'true') != "false"
            full_info = request.query.get('full_info', 'false').lower() == "true"

            if not overwrite and os.path.exists(dest):
                return web.Response(status=409, text="File already exists")

            logger.info(f"moving '{source}' -> '{dest}'")
            shutil.move(source, dest)

            user_path = self.get_request_user_filepath(request, None)
            if full_info:
                resp = get_file_info(dest, user_path)
            else:
                resp = os.path.relpath(dest, user_path)

            return web.json_response(resp)
