from os import environ
from pathlib import Path
from subprocess import check_output
from sys import executable as python_executable

from scrapling import __version__
from scrapling.core.utils import log
from scrapling.engines.toolbelt.custom import Response
from scrapling.core.utils._shell import _CookieParser, _ParseHeaders
from scrapling.core._types import List, Optional, Dict, Tuple, Any, Callable

from orjson import loads as json_loads, JSONDecodeError

try:
    from click import command, option, Choice, group, argument, version_option
except (ImportError, ModuleNotFoundError) as e:
    raise ModuleNotFoundError(
        "You need to install scrapling with any of the extras to enable Shell commands. See: https://scrapling.readthedocs.io/en/latest/#installation"
    ) from e

__OUTPUT_FILE_HELP__ = "The output file path can be an HTML file, a Markdown file of the HTML content, or the text content itself. Use file extensions (`.html`/`.md`/`.txt`) respectively."
__PACKAGE_DIR__ = Path(__file__).parent


def __Execute(cmd: List[str], help_line: str) -> None:  # pragma: no cover
    print(f"Installing {help_line}...")
    _ = check_output(cmd, shell=False)  # nosec B603
    # I meant to not use try except here


def __ParseJSONData(json_string: Optional[str] = None) -> Optional[Dict[str, Any]]:
    """Parse JSON string into a Python object"""
    if not json_string:
        return None

    try:
        return json_loads(json_string)
    except JSONDecodeError as err:  # pragma: no cover
        raise ValueError(f"Invalid JSON data '{json_string}': {err}")


def __Request_and_Save(
    fetcher_func: Callable[..., Response],
    url: str,
    output_file: str,
    css_selector: Optional[str] = None,
    ai_targeted: bool = False,
    **kwargs,
) -> None:
    """Make a request using the specified fetcher function and save the result"""
    from scrapling.core.shell import Convertor

    # Handle relative paths - convert to an absolute path based on the current working directory
    output_path = Path(output_file)
    if not output_path.is_absolute():
        output_path = Path.cwd() / output_file

    if ai_targeted:
        kwargs.setdefault("block_ads", True)
    response = fetcher_func(url, **kwargs)
    Convertor.write_content_to_file(response, str(output_path), css_selector, main_content_only=ai_targeted)
    log.info(f"Content successfully saved to '{output_path}'")


def __ParseExtractArguments(
    headers: List[str], cookies: str, params: str, json: Optional[str] = None
) -> Tuple[Dict[str, str], Dict[str, str], Dict[str, str], Optional[Dict[str, str]]]:
    """Parse arguments for extract command"""
    parsed_headers, parsed_cookies = _ParseHeaders(headers)
    if cookies:
        for key, value in _CookieParser(cookies):
            try:
                parsed_cookies[key] = value
            except Exception as err:
                raise ValueError(f"Could not parse cookies '{cookies}': {err}")

    parsed_json = __ParseJSONData(json)
    parsed_params = {}
    for param in params:
        if "=" in param:
            key, value = param.split("=", 1)
            parsed_params[key] = value

    return parsed_headers, parsed_cookies, parsed_params, parsed_json


def __BuildRequest(headers: List[str], cookies: str, params: str, json: Optional[str] = None, **kwargs) -> Dict:
    """Build a request object using the specified arguments"""
    # Parse parameters
    parsed_headers, parsed_cookies, parsed_params, parsed_json = __ParseExtractArguments(headers, cookies, params, json)
    # Build request arguments
    request_kwargs: Dict[str, Any] = {
        "headers": parsed_headers if parsed_headers else None,
        "cookies": parsed_cookies if parsed_cookies else None,
    }
    if parsed_json:
        request_kwargs["json"] = parsed_json
    if parsed_params:
        request_kwargs["params"] = parsed_params
    if "proxy" in kwargs:
        request_kwargs["proxy"] = kwargs.pop("proxy")

    # Parse impersonate parameter if it contains commas (for random selection)
    if "impersonate" in kwargs and "," in (kwargs.get("impersonate") or ""):
        kwargs["impersonate"] = [browser.strip() for browser in kwargs["impersonate"].split(",")]

    return {**request_kwargs, **kwargs}


@command(help="Install all Scrapling's Fetchers dependencies")
@option(
    "-f",
    "--force",
    "force",
    is_flag=True,
    default=False,
    type=bool,
    help="Force Scrapling to reinstall all Fetchers dependencies",
)
def install(force):  # pragma: no cover
    if force or not __PACKAGE_DIR__.joinpath(".scrapling_dependencies_installed").exists():
        __Execute(
            [python_executable, "-m", "playwright", "install", "chromium"],
            "Playwright browsers",
        )
        __Execute(
            [
                python_executable,
                "-m",
                "playwright",
                "install-deps",
                "chromium",
            ],
            "Playwright dependencies",
        )
        from tld.utils import update_tld_names

        update_tld_names(fail_silently=True)
        # if no errors raised by the above commands, then we add the below file
        __PACKAGE_DIR__.joinpath(".scrapling_dependencies_installed").touch()
    else:
        print("The dependencies are already installed")


@command(help="Run Scrapling's MCP server (Check the docs for more info).")
@option(
    "--http",
    is_flag=True,
    default=False,
    help="Whether to run the MCP server in streamable-http transport or leave it as stdio (Default: False)",
)
@option(
    "--host",
    type=str,
    default="0.0.0.0",
    help="The host to use if streamable-http transport is enabled (Default: '0.0.0.0')",
)
@option(
    "--port", type=int, default=8000, help="The port to use if streamable-http transport is enabled (Default: 8000)"
)
@option(
    "--executable-path",
    type=str,
    default=None,
    help="Path to a custom Chromium-compatible browser executable for browser-based MCP tools",
)
def mcp(http, host, port, executable_path):
    from scrapling.core.ai import ScraplingMCPServer

    server = ScraplingMCPServer(executable_path=executable_path)
    server.serve(http, host, port)


@command(help="Interactive scraping console")
@option(
    "-c",
    "--code",
    "code",
    is_flag=False,
    default="",
    type=str,
    help="Evaluate the code in the shell, print the result and exit",
)
@option(
    "-L",
    "--loglevel",
    "level",
    is_flag=False,
    default="debug",
    type=Choice(["debug", "info", "warning", "error", "critical", "fatal"], case_sensitive=False),
    help="Log level (default: DEBUG)",
)
def shell(code, level):
    from scrapling.core.shell import CustomShell

    console = CustomShell(code=code, log_level=level)
    console.start()


@group(
    help="Fetch web pages using various fetchers and extract full/selected HTML content as HTML, Markdown, or extract text content."
)
def extract():
    """Extract content from web pages and save to files"""
    pass


####
# Shared Click option decorator factories
####


def _common_http_options(f):
    """Apply shared Click options for all HTTP extract commands (get/post/put/delete)."""
    decorators = [
        option(
            "--ai-targeted",
            is_flag=True,
            default=False,
            help="Extract only main content and sanitize hidden elements for AI consumption (default: False)",
        ),
        option(
            "--stealthy-headers/--no-stealthy-headers",
            default=True,
            help="Use stealthy browser headers (default: True)",
        ),
        option(
            "--impersonate",
            help="Browser to impersonate. Can be a single browser (e.g., chrome) or comma-separated list for random selection (e.g., chrome,firefox,safari).",
        ),
        option(
            "--verify/--no-verify",
            default=True,
            help="Whether to verify SSL certificates (default: True)",
        ),
        option(
            "--follow-redirects/--no-follow-redirects",
            default=True,
            help="Whether to follow redirects (default: True)",
        ),
        option(
            "--params",
            "-p",
            multiple=True,
            help='Query parameters in format "key=value" (can be used multiple times)',
        ),
        option(
            "--css-selector",
            "-s",
            help="CSS selector to extract specific content from the page. It returns all matches.",
        ),
        option("--proxy", help='Proxy URL in format "http://username:password@host:port"'),
        option("--timeout", type=int, default=30, help="Request timeout in seconds (default: 30)"),
        option("--cookies", help='Cookies string in format "name1=value1; name2=value2"'),
        option(
            "--headers",
            "-H",
            multiple=True,
            help='HTTP headers in format "Key: Value" (can be used multiple times)',
        ),
    ]
    for decorator in decorators:
        f = decorator(f)
    return f


def _common_browser_options(f):
    """Apply shared Click options for browser-based commands (fetch/stealthy_fetch)."""
    decorators = [
        option(
            "--ai-targeted",
            is_flag=True,
            default=False,
            help="Extract only main content and sanitize hidden elements for AI consumption (default: False)",
        ),
        option(
            "--executable-path",
            type=str,
            default=None,
            help="Path to a custom Chromium-compatible browser executable. Falls back to the SCRAPLING_EXECUTABLE_PATH environment variable when not set.",
        ),
        option(
            "--extra-headers",
            "-H",
            multiple=True,
            help='Extra headers in format "Key: Value" (can be used multiple times)',
        ),
        option("--proxy", help='Proxy URL in format "http://username:password@host:port"'),
        option(
            "--real-chrome/--no-real-chrome",
            default=False,
            help="If you have a Chrome browser installed on your device, enable this, and the Fetcher will launch an instance of your browser and use it. (default: False)",
        ),
        option("--locale", default=None, help="Specify user locale. Defaults to the system default locale."),
        option("--wait-selector", help="CSS selector to wait for before proceeding"),
        option(
            "--css-selector",
            "-s",
            help="CSS selector to extract specific content from the page. It returns all matches.",
        ),
        option(
            "--wait",
            type=int,
            default=0,
            help="Additional wait time in milliseconds after page load (default: 0)",
        ),
        option(
            "--timeout",
            type=int,
            default=30000,
            help="Timeout in milliseconds (default: 30000)",
        ),
        option(
            "--network-idle/--no-network-idle",
            default=False,
            help="Wait for network idle (default: False)",
        ),
        option(
            "--disable-resources/--enable-resources",
            default=False,
            help="Drop unnecessary resources for speed boost (default: False)",
        ),
        option(
            "--headless/--no-headless",
            default=True,
            help="Run browser in headless mode (default: True)",
        ),
        option(
            "--dns-over-https/--no-dns-over-https",
            default=False,
            help="Route DNS through Cloudflare's DoH to prevent DNS leaks when using proxies (default: False)",
        ),
        option(
            "--block-ads/--no-block-ads",
            default=False,
            help="Block requests to known ad and tracker domains (default: False)",
        ),
    ]
    for decorator in decorators:
        f = decorator(f)
    return f


def _data_options(f):
    """Apply data/json options for POST and PUT commands."""
    decorators = [
        option("--json", "-j", help="JSON data to include in the request body (as string)"),
        option(
            "--data",
            "-d",
            help='Form data to include in the request body (as string, ex: "param1=value1&param2=value2")',
        ),
    ]
    for decorator in decorators:
        f = decorator(f)
    return f


def __http_command(
    method_name: str, url: str, output_file: str, css_selector: Optional[str], ai_targeted: bool = False, **kwargs
) -> None:
    """Shared implementation for HTTP extract commands."""
    from scrapling.fetchers import Fetcher

    __Request_and_Save(getattr(Fetcher, method_name), url, output_file, css_selector, ai_targeted=ai_targeted, **kwargs)


@extract.command(help=f"Perform a GET request and save the content to a file.\n\n{__OUTPUT_FILE_HELP__}")
@argument("url", required=True)
@argument("output_file", required=True)
@_common_http_options
def get(
    url,
    output_file,
    headers,
    cookies,
    timeout,
    proxy,
    css_selector,
    params,
    follow_redirects,
    verify,
    impersonate,
    stealthy_headers,
    ai_targeted,
):
    """Perform a GET request and save the content to a file."""
    kwargs = __BuildRequest(
        headers,
        cookies,
        params,
        None,
        timeout=timeout,
        follow_redirects=follow_redirects,
        verify=verify,
        stealthy_headers=stealthy_headers,
        impersonate=impersonate,
        proxy=proxy,
    )
    __http_command("get", url, output_file, css_selector, ai_targeted=ai_targeted, **kwargs)


@extract.command(help=f"Perform a POST request and save the content to a file.\n\n{__OUTPUT_FILE_HELP__}")
@argument("url", required=True)
@argument("output_file", required=True)
@_data_options
@_common_http_options
def post(
    url,
    output_file,
    data,
    json,
    headers,
    cookies,
    timeout,
    proxy,
    css_selector,
    params,
    follow_redirects,
    verify,
    impersonate,
    stealthy_headers,
    ai_targeted,
):
    """Perform a POST request and save the content to a file."""
    kwargs = __BuildRequest(
        headers,
        cookies,
        params,
        json,
        timeout=timeout,
        follow_redirects=follow_redirects,
        verify=verify,
        stealthy_headers=stealthy_headers,
        impersonate=impersonate,
        proxy=proxy,
        data=data,
    )
    __http_command("post", url, output_file, css_selector, ai_targeted=ai_targeted, **kwargs)


@extract.command(help=f"Perform a PUT request and save the content to a file.\n\n{__OUTPUT_FILE_HELP__}")
@argument("url", required=True)
@argument("output_file", required=True)
@_data_options
@_common_http_options
def put(
    url,
    output_file,
    data,
    json,
    headers,
    cookies,
    timeout,
    proxy,
    css_selector,
    params,
    follow_redirects,
    verify,
    impersonate,
    stealthy_headers,
    ai_targeted,
):
    """Perform a PUT request and save the content to a file."""
    kwargs = __BuildRequest(
        headers,
        cookies,
        params,
        json,
        timeout=timeout,
        follow_redirects=follow_redirects,
        verify=verify,
        stealthy_headers=stealthy_headers,
        impersonate=impersonate,
        proxy=proxy,
        data=data,
    )
    __http_command("put", url, output_file, css_selector, ai_targeted=ai_targeted, **kwargs)


@extract.command(help=f"Perform a DELETE request and save the content to a file.\n\n{__OUTPUT_FILE_HELP__}")
@argument("url", required=True)
@argument("output_file", required=True)
@_common_http_options
def delete(
    url,
    output_file,
    headers,
    cookies,
    timeout,
    proxy,
    css_selector,
    params,
    follow_redirects,
    verify,
    impersonate,
    stealthy_headers,
    ai_targeted,
):
    """Perform a DELETE request and save the content to a file."""
    kwargs = __BuildRequest(
        headers,
        cookies,
        params,
        None,
        timeout=timeout,
        follow_redirects=follow_redirects,
        verify=verify,
        stealthy_headers=stealthy_headers,
        impersonate=impersonate,
        proxy=proxy,
    )
    __http_command("delete", url, output_file, css_selector, ai_targeted=ai_targeted, **kwargs)


def __build_browser_kwargs(
    headless,
    disable_resources,
    network_idle,
    timeout,
    wait,
    wait_selector,
    locale,
    real_chrome,
    proxy,
    parsed_headers,
    dns_over_https,
    block_ads,
    executable_path,
) -> Dict[str, Any]:
    """Build shared kwargs dict for browser-based commands."""
    kwargs: Dict[str, Any] = {
        "headless": headless,
        "disable_resources": disable_resources,
        "network_idle": network_idle,
        "timeout": timeout,
        "locale": locale,
        "real_chrome": real_chrome,
        "dns_over_https": dns_over_https,
        "block_ads": block_ads,
    }
    if wait > 0:
        kwargs["wait"] = wait
    if wait_selector:
        kwargs["wait_selector"] = wait_selector
    if proxy:
        kwargs["proxy"] = proxy
    if parsed_headers:
        kwargs["extra_headers"] = parsed_headers
    executable_path = executable_path or environ.get("SCRAPLING_EXECUTABLE_PATH") or None
    if executable_path:
        kwargs["executable_path"] = executable_path
    return kwargs


@extract.command(help=f"Use DynamicFetcher to fetch content with browser automation.\n\n{__OUTPUT_FILE_HELP__}")
@argument("url", required=True)
@argument("output_file", required=True)
@_common_browser_options
def fetch(
    url,
    output_file,
    headless,
    disable_resources,
    network_idle,
    timeout,
    wait,
    css_selector,
    wait_selector,
    locale,
    real_chrome,
    proxy,
    extra_headers,
    ai_targeted,
    executable_path,
    dns_over_https,
    block_ads,
):
    """Opens up a browser and fetch content using DynamicFetcher."""
    parsed_headers, _ = _ParseHeaders(extra_headers, False)
    kwargs = __build_browser_kwargs(
        headless,
        disable_resources,
        network_idle,
        timeout,
        wait,
        wait_selector,
        locale,
        real_chrome,
        proxy,
        parsed_headers,
        dns_over_https,
        block_ads,
        executable_path,
    )
    from scrapling.fetchers import DynamicFetcher

    __Request_and_Save(DynamicFetcher.fetch, url, output_file, css_selector, ai_targeted=ai_targeted, **kwargs)


@extract.command(help=f"Use StealthyFetcher to fetch content with advanced stealth features.\n\n{__OUTPUT_FILE_HELP__}")
@argument("url", required=True)
@argument("output_file", required=True)
@option(
    "--block-webrtc/--allow-webrtc",
    default=False,
    help="Block WebRTC entirely (default: False)",
)
@option(
    "--solve-cloudflare/--no-solve-cloudflare",
    default=False,
    help="Solve Cloudflare challenges (default: False)",
)
@option("--allow-webgl/--block-webgl", default=True, help="Allow WebGL (default: True)")
@option(
    "--hide-canvas/--show-canvas",
    default=False,
    help="Add noise to canvas operations (default: False)",
)
@_common_browser_options
def stealthy_fetch(
    url,
    output_file,
    headless,
    disable_resources,
    network_idle,
    timeout,
    wait,
    css_selector,
    wait_selector,
    locale,
    real_chrome,
    proxy,
    extra_headers,
    block_webrtc,
    solve_cloudflare,
    allow_webgl,
    hide_canvas,
    ai_targeted,
    executable_path,
    dns_over_https,
    block_ads,
):
    """Opens up a browser with advanced stealth features and fetch content using StealthyFetcher."""
    parsed_headers, _ = _ParseHeaders(extra_headers, False)
    kwargs = __build_browser_kwargs(
        headless,
        disable_resources,
        network_idle,
        timeout,
        wait,
        wait_selector,
        locale,
        real_chrome,
        proxy,
        parsed_headers,
        dns_over_https,
        block_ads,
        executable_path,
    )
    kwargs.update(
        {
            "block_webrtc": block_webrtc,
            "solve_cloudflare": solve_cloudflare,
            "allow_webgl": allow_webgl,
            "hide_canvas": hide_canvas,
        }
    )
    from scrapling.fetchers import StealthyFetcher

    __Request_and_Save(StealthyFetcher.fetch, url, output_file, css_selector, ai_targeted=ai_targeted, **kwargs)


@group()
@version_option(version=__version__, prog_name="Scrapling")
def main():
    pass


# Adding commands
main.add_command(install)
main.add_command(shell)
main.add_command(extract)
main.add_command(mcp)