from __future__ import annotations
import argparse
import logging
import os
import re
import sys
import tempfile
import zipfile
import importlib
from dataclasses import dataclass
from functools import cached_property
from pathlib import Path
from typing import TypedDict, Optional
from importlib.metadata import version

import requests
from typing_extensions import NotRequired

from utils.install_util import get_missing_requirements_message, requirements_path
from comfy.cli_args import DEFAULT_VERSION_STRING
import app.logger

def frontend_install_warning_message():
    return f"""
{get_missing_requirements_message()}

This error is happening because the ComfyUI frontend is no longer shipped as part of the main repo but as a pip package instead.
""".strip()


def check_frontend_version():
    """Check if the frontend version is up to date."""

    def parse_version(version: str) -> tuple[int, int, int]:
        return tuple(map(int, version.split(".")))

    try:
        frontend_version_str = version("comfyui-frontend-package")
        frontend_version = parse_version(frontend_version_str)
        with open(requirements_path, "r", encoding="utf-8") as f:
            required_frontend = parse_version(f.readline().split("=")[-1])
        if frontend_version < required_frontend:
            app.logger.log_startup_warning(
                f"""
________________________________________________________________________
WARNING WARNING WARNING WARNING WARNING

Installed frontend version {".".join(map(str, frontend_version))} is lower than the recommended version {".".join(map(str, required_frontend))}.

{frontend_install_warning_message()}
________________________________________________________________________
""".strip()
            )
        else:
            logging.info("ComfyUI frontend version: {}".format(frontend_version_str))
    except Exception as e:
        logging.error(f"Failed to check frontend version: {e}")


REQUEST_TIMEOUT = 10  # seconds


class Asset(TypedDict):
    url: str


class Release(TypedDict):
    id: int
    tag_name: str
    name: str
    prerelease: bool
    created_at: str
    published_at: str
    body: str
    assets: NotRequired[list[Asset]]


@dataclass
class FrontEndProvider:
    owner: str
    repo: str

    @property
    def folder_name(self) -> str:
        return f"{self.owner}_{self.repo}"

    @property
    def release_url(self) -> str:
        return f"https://api.github.com/repos/{self.owner}/{self.repo}/releases"

    @cached_property
    def all_releases(self) -> list[Release]:
        releases = []
        api_url = self.release_url
        while api_url:
            response = requests.get(api_url, timeout=REQUEST_TIMEOUT)
            response.raise_for_status()  # Raises an HTTPError if the response was an error
            releases.extend(response.json())
            # GitHub uses the Link header to provide pagination links. Check if it exists and update api_url accordingly.
            if "next" in response.links:
                api_url = response.links["next"]["url"]
            else:
                api_url = None
        return releases

    @cached_property
    def latest_release(self) -> Release:
        latest_release_url = f"{self.release_url}/latest"
        response = requests.get(latest_release_url, timeout=REQUEST_TIMEOUT)
        response.raise_for_status()  # Raises an HTTPError if the response was an error
        return response.json()

    def get_release(self, version: str) -> Release:
        if version == "latest":
            return self.latest_release
        else:
            for release in self.all_releases:
                if release["tag_name"] in [version, f"v{version}"]:
                    return release
            raise ValueError(f"Version {version} not found in releases")


def download_release_asset_zip(release: Release, destination_path: str) -> None:
    """Download dist.zip from github release."""
    asset_url = None
    for asset in release.get("assets", []):
        if asset["name"] == "dist.zip":
            asset_url = asset["url"]
            break

    if not asset_url:
        raise ValueError("dist.zip not found in the release assets")

    # Use a temporary file to download the zip content
    with tempfile.TemporaryFile() as tmp_file:
        headers = {"Accept": "application/octet-stream"}
        response = requests.get(
            asset_url, headers=headers, allow_redirects=True, timeout=REQUEST_TIMEOUT
        )
        response.raise_for_status()  # Ensure we got a successful response

        # Write the content to the temporary file
        tmp_file.write(response.content)

        # Go back to the beginning of the temporary file
        tmp_file.seek(0)

        # Extract the zip file content to the destination path
        with zipfile.ZipFile(tmp_file, "r") as zip_ref:
            zip_ref.extractall(destination_path)


class FrontendManager:
    """
    A class to manage ComfyUI frontend versions and installations.

    This class handles the initialization and management of different frontend versions,
    including the default frontend from the pip package and custom frontend versions
    from GitHub repositories.

    Attributes:
        CUSTOM_FRONTENDS_ROOT (str): The root directory where custom frontend versions are stored.
    """

    CUSTOM_FRONTENDS_ROOT = str(Path(__file__).parents[1] / "web_custom_versions")

    @classmethod
    def default_frontend_path(cls) -> str:
        """
        Get the path to the default frontend installation from the pip package.

        Returns:
            str: The path to the default frontend static files.

        Raises:
            SystemExit: If the comfyui-frontend-package is not installed.
        """
        try:
            import comfyui_frontend_package

            return str(importlib.resources.files(comfyui_frontend_package) / "static")
        except ImportError:
            logging.error(
                f"""
********** ERROR ***********

comfyui-frontend-package is not installed.

{frontend_install_warning_message()}

********** ERROR ***********
""".strip()
            )
            sys.exit(-1)

    @classmethod
    def templates_path(cls) -> str:
        """
        Get the path to the workflow templates.

        Returns:
            str: The path to the workflow templates directory.

        Raises:
            SystemExit: If the comfyui-workflow-templates package is not installed.
        """
        try:
            import comfyui_workflow_templates

            return str(
                importlib.resources.files(comfyui_workflow_templates) / "templates"
            )
        except ImportError:
            logging.error(
                f"""
********** ERROR ***********

comfyui-workflow-templates is not installed.

{frontend_install_warning_message()}

********** ERROR ***********
""".strip()
            )

    @classmethod
    def embedded_docs_path(cls) -> str:
        """Get the path to embedded documentation"""
        try:
            import comfyui_embedded_docs

            return str(
                importlib.resources.files(comfyui_embedded_docs) / "docs"
            )
        except ImportError:
            logging.info("comfyui-embedded-docs package not found")
            return None

    @classmethod
    def parse_version_string(cls, value: str) -> tuple[str, str, str]:
        """
        Parse a version string into its components.

        The version string should be in the format: 'owner/repo@version'
        where version can be either a semantic version (v1.2.3) or 'latest'.

        Args:
            value (str): The version string to parse.

        Returns:
            tuple[str, str, str]: A tuple containing (owner, repo, version).

        Raises:
            argparse.ArgumentTypeError: If the version string is invalid.
        """
        VERSION_PATTERN = r"^([a-zA-Z0-9][a-zA-Z0-9-]{0,38})/([a-zA-Z0-9_.-]+)@(v?\d+\.\d+\.\d+|latest)$"
        match_result = re.match(VERSION_PATTERN, value)
        if match_result is None:
            raise argparse.ArgumentTypeError(f"Invalid version string: {value}")

        return match_result.group(1), match_result.group(2), match_result.group(3)

    @classmethod
    def init_frontend_unsafe(
        cls, version_string: str, provider: Optional[FrontEndProvider] = None
    ) -> str:
        """
        Initialize a frontend version without error handling.

        This method attempts to initialize a specific frontend version, either from
        the default pip package or from a custom GitHub repository. It will download
        and extract the frontend files if necessary.

        Args:
            version_string (str): The version string specifying which frontend to use.
            provider (FrontEndProvider, optional): The provider to use for custom frontends.

        Returns:
            str: The path to the initialized frontend.

        Raises:
            Exception: If there is an error during initialization (e.g., network timeout,
                      invalid URL, or missing assets).
        """
        if version_string == DEFAULT_VERSION_STRING:
            check_frontend_version()
            return cls.default_frontend_path()

        repo_owner, repo_name, version = cls.parse_version_string(version_string)

        if version.startswith("v"):
            expected_path = str(
                Path(cls.CUSTOM_FRONTENDS_ROOT)
                / f"{repo_owner}_{repo_name}"
                / version.lstrip("v")
            )
            if os.path.exists(expected_path):
                logging.info(
                    f"Using existing copy of specific frontend version tag: {repo_owner}/{repo_name}@{version}"
                )
                return expected_path

        logging.info(
            f"Initializing frontend: {repo_owner}/{repo_name}@{version}, requesting version details from GitHub..."
        )

        provider = provider or FrontEndProvider(repo_owner, repo_name)
        release = provider.get_release(version)

        semantic_version = release["tag_name"].lstrip("v")
        web_root = str(
            Path(cls.CUSTOM_FRONTENDS_ROOT) / provider.folder_name / semantic_version
        )
        if not os.path.exists(web_root):
            try:
                os.makedirs(web_root, exist_ok=True)
                logging.info(
                    "Downloading frontend(%s) version(%s) to (%s)",
                    provider.folder_name,
                    semantic_version,
                    web_root,
                )
                logging.debug(release)
                download_release_asset_zip(release, destination_path=web_root)
            finally:
                # Clean up the directory if it is empty, i.e. the download failed
                if not os.listdir(web_root):
                    os.rmdir(web_root)

        return web_root

    @classmethod
    def init_frontend(cls, version_string: str) -> str:
        """
        Initialize a frontend version with error handling.

        This is the main method to initialize a frontend version. It wraps init_frontend_unsafe
        with error handling, falling back to the default frontend if initialization fails.

        Args:
            version_string (str): The version string specifying which frontend to use.

        Returns:
            str: The path to the initialized frontend. If initialization fails,
                 returns the path to the default frontend.
        """
        try:
            return cls.init_frontend_unsafe(version_string)
        except Exception as e:
            logging.error("Failed to initialize frontend: %s", e)
            logging.info("Falling back to the default frontend.")
            check_frontend_version()
            return cls.default_frontend_path()