from __future__ import annotations

import os
import time
import json
from typing import Optional, List

try:
    from platformdirs import user_config_dir

    has_platformdirs = True
except ImportError:
    has_platformdirs = False

try:
    from browser_cookie3 import (
        chrome,
        chromium,
        opera,
        opera_gx,
        brave,
        edge,
        vivaldi,
        firefox,
        _LinuxPasswordManager,
        BrowserCookieError,
    )

    def g4f(domain_name: str) -> list:
        """
        Load cookies from the 'g4f' browser (if exists).
        """
        if not has_platformdirs:
            return []
        user_data_dir = user_config_dir("g4f")
        cookie_file = os.path.join(user_data_dir, "Default", "Cookies")
        return (
            [] if not os.path.exists(cookie_file) else chrome(cookie_file, domain_name)
        )

    BROWSERS = [
        g4f,
        firefox,
        chrome,
        chromium,
        opera,
        opera_gx,
        brave,
        edge,
        vivaldi,
    ]
    has_browser_cookie3 = True
except ImportError:
    has_browser_cookie3 = False
    BROWSERS: List = []

from .typing import Dict, Cookies
from .errors import MissingRequirementsError
from .config import AppConfig, COOKIES_DIR, CUSTOM_COOKIES_DIR
from . import debug


class HeadersConfig:
    headers: Dict[str, Dict[str, str]] = {}


class CookiesConfig:
    cookies: Dict[str, Cookies] = {}
    cookies_dir: str = (
        CUSTOM_COOKIES_DIR if os.path.exists(CUSTOM_COOKIES_DIR) else str(COOKIES_DIR)
    )


class BrowserConfig:
    port: int = None
    host: str = "127.0.0.1"
    impersonate: str = "chrome"
    executable_path: str = None
    connection_timeout: float = 0.25

    @staticmethod
    async def stop_browser():
        return None

    @classmethod
    def load_from_env(cls):
        cls.port = os.environ.get("G4F_BROWSER_PORT", cls.port)
        cls.host = os.environ.get("G4F_BROWSER_HOST", cls.host)
        cls.executable_path = os.environ.get(
            "G4F_BROWSER_EXECUTABLE_PATH", cls.executable_path
        )
        cls.connection_timeout = float(
            os.environ.get("G4F_BROWSER_CONNECTION_TIMEOUT", cls.connection_timeout)
        )
        if cls.port:
            cls.port = int(cls.port)
            debug.log(f"Using browser: {cls.host}:{cls.port}")
        cls.impersonate = os.environ.get("G4F_BROWSER_IMPERSONATE", cls.impersonate)


COOKIE_DOMAINS = (
    ".bing.com",
    ".meta.ai",
    ".google.com",
    "www.whiterabbitneo.com",
    "huggingface.co",
    ".huggingface.co",
    "chat.reka.ai",
    "chatgpt.com",
    ".cerebras.ai",
    "github.com",
    "yupp.ai",
    "chat.deepseek.com",
    ".perplexity.ai",
    "ollama.com",
)

if (
    has_browser_cookie3
    and os.environ.get("DBUS_SESSION_BUS_ADDRESS", "/dev/null") == "/dev/null"
):
    _LinuxPasswordManager.get_password = lambda a, b: b"secret"


def get_headers(domain_name: str) -> Dict[str, str]:
    """Get cached headers for a domain."""
    return HeadersConfig.headers.get(domain_name, {})


def get_cookies(
    domain_name: str,
    raise_requirements_error: bool = True,
    single_browser: Optional[str] = None,
    cache_result: bool = True,
) -> Dict[str, str]:
    """Load cookies for a given domain from all supported browsers."""
    if single_browser != "all" and domain_name in CookiesConfig.cookies:
        return CookiesConfig.cookies[domain_name]

    cookies = load_cookies_from_browsers(
        domain_name, raise_requirements_error, single_browser
    )
    if single_browser != "all" and cache_result:
        if len(cookies) > 0:
            CookiesConfig.cookies[domain_name] = cookies
        return CookiesConfig.cookies.get(domain_name, {})
    return cookies


def set_cookies(domain_name: str, cookies: Cookies = None) -> None:
    """Set or remove cookies for a given domain in the cache."""
    if cookies:
        CookiesConfig.cookies[domain_name] = cookies
    else:
        CookiesConfig.cookies.pop(domain_name, None)


def load_cookies_from_browsers(
    domain_name: str,
    raise_requirements_error: bool = True,
    single_browser: Optional[str] = None,
) -> Cookies:
    """Helper to load cookies from all supported browsers."""
    if not has_browser_cookie3:
        if raise_requirements_error:
            raise MissingRequirementsError('Install "browser_cookie3" package')
        return {}

    cookies = {}
    all_cookies = {}
    for cookie_fn in BROWSERS:
        if domain_name in CookiesConfig.cookies:
            all_cookies[cookie_fn.__name__] = {
                "config": CookiesConfig.cookies.get(domain_name, {})
            }
        else:
            all_cookies[cookie_fn.__name__] = {}
        try:
            cookie_jar = cookie_fn(domain_name=domain_name)
            for cookie in cookie_jar:
                if cookie.name not in cookies and (
                    not cookie.expires or cookie.expires > time.time()
                ):
                    cookies[cookie.name] = cookie.value
                    all_cookies[cookie_fn.__name__][cookie.name] = cookie.value
            if len(all_cookies[cookie_fn.__name__]) > 0:
                debug.log(
                    f"Total cookies loaded for {domain_name} from {cookie_fn.__name__}: {len(all_cookies[cookie_fn.__name__])}"
                )
            if single_browser is True and cookie_jar:
                break
        except BrowserCookieError:
            pass
        except KeyboardInterrupt:
            debug.error("Cookie loading interrupted by user.")
            break
        except Exception as e:
            debug.error(
                f"Error reading cookies from {cookie_fn.__name__} for {domain_name}: {type(e).__name__}: {e}"
            )
    if single_browser == "all":
        return all_cookies
    return cookies


def set_cookies_dir(dir_path: str) -> None:
    CookiesConfig.cookies_dir = dir_path


def get_cookies_dir() -> str:
    return CookiesConfig.cookies_dir


def _get_domain(entry: dict) -> Optional[str]:
    headers = entry["request"].get("headers", [])
    host_values = [
        h["value"] for h in headers if h["name"].lower() in ("host", ":authority")
    ]
    if not host_values:
        return None
    host = host_values.pop()
    return next((d for d in COOKIE_DOMAINS if d in host), None)


def _get_headers(entry) -> dict:
    return {
        h["name"].lower(): h["value"]
        for h in entry["request"]["headers"]
        if h["name"].lower() not in ["content-length", "cookie"]
        and not h["name"].startswith(":")
    }


def _parse_har_file(path: str) -> Dict[str, Dict[str, str]]:
    """Parse a HAR file and return cookies by domain."""
    cookies_by_domain = {}
    try:
        with open(path, "rb") as file:
            har_file = json.load(file)
        debug.log(f"Read .har file: {path}")

        for entry in har_file.get("log", {}).get("entries", []):
            domain = _get_domain(entry)
            if domain:
                HeadersConfig.headers[domain] = {
                    **HeadersConfig.headers.get(domain, {}),
                    **_get_headers(entry),
                }
                v_cookies = {
                    c["name"]: c["value"] for c in entry["request"].get("cookies", [])
                }
                if v_cookies:
                    cookies_by_domain[domain] = v_cookies
    except (json.JSONDecodeError, FileNotFoundError):
        pass
    return cookies_by_domain


def _parse_json_cookie_file(path: str) -> Dict[str, Dict[str, str]]:
    """Parse a JSON cookie export file."""
    cookies_by_domain = {}
    try:
        with open(path, "rb") as file:
            cookie_file = json.load(file)
        if not isinstance(cookie_file, list):
            return {}
        debug.log(f"Read cookie file: {path}")
        for c in cookie_file:
            if isinstance(c, dict) and "domain" in c:
                cookies_by_domain.setdefault(c["domain"], {})[c["name"]] = c["value"]
    except (json.JSONDecodeError, FileNotFoundError):
        pass
    return cookies_by_domain


def read_cookie_files(
    dir_path: Optional[str] = None, domains_filter: Optional[List[str]] = None
) -> None:
    """
    Load cookies from .har and .json files in a directory.
    """
    dir_path = dir_path or CookiesConfig.cookies_dir
    if not os.access(dir_path, os.R_OK):
        debug.log(f"Read cookies: {dir_path} dir is not readable")
        return

    # Optionally load environment variables
    try:
        from dotenv import load_dotenv

        env_path = os.path.join(dir_path, ".env")
        load_dotenv(env_path, override=True)
        debug.log(f"Loaded env vars from {env_path}: {os.path.exists(env_path)}")
    except ImportError:
        debug.error("Warning: 'python-dotenv' is not installed. Env vars not loaded.")

    AppConfig.load_from_env()
    BrowserConfig.load_from_env()

    if os.path.exists(os.path.join(dir_path, ".browser_is_open")):
        os.remove(os.path.join(dir_path, ".browser_is_open"))

    har_files, json_files = [], []
    for root, _, files in os.walk(dir_path):
        for file in files:
            if file.endswith(".har"):
                har_files.append(os.path.join(root, file))
            elif file.endswith(".json"):
                json_files.append(os.path.join(root, file))
        break  # Do not recurse

    CookiesConfig.cookies.clear()

    # Load cookies from files
    for path in har_files:
        for domain, cookies in _parse_har_file(path).items():
            if not domains_filter or domain in domains_filter:
                CookiesConfig.cookies[domain] = cookies
                debug.log(f"Cookies added: {len(cookies)} from {domain}")

    for path in json_files:
        for domain, cookies in _parse_json_cookie_file(path).items():
            if not domains_filter or domain in domains_filter:
                CookiesConfig.cookies[domain] = cookies
                debug.log(f"Cookies added: {len(cookies)} from {domain}")

    # Load custom model routing config (config.yaml)
    try:
        from .providers.config_provider import RouterConfig

        config_path = os.path.join(dir_path, "config.yaml")
        RouterConfig.load(config_path)
    except Exception as e:
        config_path = os.path.join(dir_path, "config.yaml")
        debug.error(
            f"config.yaml: Failed to load routing config from {config_path}:", e
        )