import argparse
import asyncio
from functools import partial
import contextlib
import json
import os
import random
import sys
import time
import aiohttp
import pkg_resources
import regex
import requests
from typing import Union

if os.environ.get("BING_URL") == None:
    BING_URL = "https://www.bing.com"
else:
    BING_URL = os.environ.get("BING_URL")
# Generate random IP between range 13.104.0.0/14
FORWARDED_IP = (
    f"13.{random.randint(104, 107)}.{random.randint(0, 255)}.{random.randint(0, 255)}"
)
HEADERS = {
    "accept": "text/html,application/xhtml+xml,application/xml;q=0.9,image/webp,image/apng,*/*;q=0.8,application/signed-exchange;v=b3;q=0.7",
    "accept-language": "en-US,en;q=0.9",
    "cache-control": "max-age=0",
    "content-type": "application/x-www-form-urlencoded",
    "referrer": "https://www.bing.com/images/create/",
    "origin": "https://www.bing.com",
    "user-agent": "Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/110.0.0.0 Safari/537.36 Edg/110.0.1587.63",
    "x-forwarded-for": FORWARDED_IP,
}

# Error messages
error_timeout = "Your request has timed out."
error_redirect = "Redirect failed"
error_blocked_prompt = (
    "Your prompt has been blocked by Bing. Try to change any bad words and try again."
)
error_noresults = "Could not get results"
error_unsupported_lang = "\nthis language is currently not supported by bing"
error_bad_images = "Bad images"
error_no_images = "No images"
#
sending_message = "Sending request..."
wait_message = "Waiting for results..."
download_message = "\nDownloading images..."


def debug(debug_file, text_var):
    """helper function for debug"""
    with open(f"{debug_file}", "a", encoding="utf-8") as f:
        f.write(str(text_var))


class ImageGen:
    """
    Image generation by Microsoft Bing
    Parameters:3
        auth_cookie: str
    """

    def __init__(
        self,
        auth_cookie: '15iNP0L_xa8fjGOOmF9For9sfHo3dWNKCMe_7LCA8XRNqtkFx0CtlH8mSTLDTaCL7GXTYF2z_TIIJKb9C2EZa6isVYJjEK39LbaRLpMCKzb5E6zO5cNilSmlqKco6e6Hn8WIUP22j_GLYVgM1awGOejEL8lcgkN0InQjpX-STlGED3PVabcfeDgDxknaiae2L29sGJ6Mt7gZnfNfgWYuO7XFXep9HAwAzSx5cprtFbwA',
        debug_file: Union[str, None] = None,
        quiet: bool = False,
        all_cookies: list[dict] = None,
    ) -> None:
        self.session: requests.Session = requests.Session()
        self.session.headers = HEADERS
        self.session.cookies.set("_U", auth_cookie)
        if all_cookies:
            for cookie in all_cookies:
                self.session.cookies.set(cookie["name"], cookie["value"])
        self.quiet = quiet
        self.debug_file = debug_file
        if self.debug_file:
            self.debug = partial(debug, self.debug_file)

    def get_images(self, prompt: str) -> list:
        """
        Fetches image links from Bing
        Parameters:
            prompt: str
        """
        if not self.quiet:
            print(sending_message)
        if self.debug_file:
            self.debug(sending_message)
        url_encoded_prompt = requests.utils.quote(prompt)
        payload = f"q={url_encoded_prompt}&qs=ds"
        # https://www.bing.com/images/create?q=<PROMPT>&rt=3&FORM=GENCRE
        url = f"{BING_URL}/images/create?q={url_encoded_prompt}&rt=4&FORM=GENCRE"
        response = self.session.post(
            url, allow_redirects=False, data=payload, timeout=200
        )
        # check for content waring message
        if "this prompt has been blocked" in response.text.lower():
            if self.debug_file:
                self.debug(f"ERROR: {error_blocked_prompt}")
            raise Exception(
                error_blocked_prompt,
            )
        if (
            "we're working hard to offer image creator in more languages"
            in response.text.lower()
        ):
            if self.debug_file:
                self.debug(f"ERROR: {error_unsupported_lang}")
            raise Exception(error_unsupported_lang)
        if response.status_code != 302:
            # if rt4 fails, try rt3
            url = f"{BING_URL}/images/create?q={url_encoded_prompt}&rt=3&FORM=GENCRE"
            response3 = self.session.post(url, allow_redirects=False, timeout=200)
            if response3.status_code != 302:
                if self.debug_file:
                    self.debug(f"ERROR: {error_redirect}")
                print(f"ERROR: {response3.text}")
                raise Exception(error_redirect)
            response = response3
        # Get redirect URL
        redirect_url = response.headers["Location"].replace("&nfy=1", "")
        request_id = redirect_url.split("id=")[-1]
        self.session.get(f"{BING_URL}{redirect_url}")
        # https://www.bing.com/images/create/async/results/{ID}?q={PROMPT}
        polling_url = f"{BING_URL}/images/create/async/results/{request_id}?q={url_encoded_prompt}"
        # Poll for results
        if self.debug_file:
            self.debug("Polling and waiting for result")
        if not self.quiet:
            print("Waiting for results...")
        start_wait = time.time()
        while True:
            if int(time.time() - start_wait) > 200:
                if self.debug_file:
                    self.debug(f"ERROR: {error_timeout}")
                raise Exception(error_timeout)
            if not self.quiet:
                print(".", end="", flush=True)
            response = self.session.get(polling_url)
            if response.status_code != 200:
                if self.debug_file:
                    self.debug(f"ERROR: {error_noresults}")
                raise Exception(error_noresults)
            if not response.text or response.text.find("errorMessage") != -1:
                time.sleep(1)
                continue
            else:
                break
        # Use regex to search for src=""
        image_links = regex.findall(r'src="([^"]+)"', response.text)
        # Remove size limit
        normal_image_links = [link.split("?w=")[0] for link in image_links]
        # Remove duplicates
        normal_image_links = list(set(normal_image_links))

        # Bad images
        bad_images = [
            "https://r.bing.com/rp/in-2zU3AJUdkgFe7ZKv19yPBHVs.png",
            "https://r.bing.com/rp/TX9QuO3WzcCJz1uaaSwQAz39Kb0.jpg",
        ]
        for img in normal_image_links:
            if img in bad_images:
                raise Exception("Bad images")
        # No images
        if not normal_image_links:
            raise Exception(error_no_images)
        return normal_image_links

    def save_images(self, links: list, output_dir: str, file_name: str = None) -> None:
        """
        Saves images to output directory
        """
        if self.debug_file:
            self.debug(download_message)
        if not self.quiet:
            print(download_message)
        with contextlib.suppress(FileExistsError):
            os.mkdir(output_dir)
        try:
            fn = f"{file_name}_" if file_name else ""
            jpeg_index = 0
            for link in links:
                while os.path.exists(
                    os.path.join(output_dir, f"{fn}{jpeg_index}.jpeg")
                ):
                    jpeg_index += 1
                with self.session.get(link, stream=True) as response:
                    # save response to file
                    response.raise_for_status()
                    with open(
                        os.path.join(output_dir, f"{fn}{jpeg_index}.jpeg"), "wb"
                    ) as output_file:
                        for chunk in response.iter_content(chunk_size=8192):
                            output_file.write(chunk)
        except requests.exceptions.MissingSchema as url_exception:
            raise Exception(
                "Inappropriate contents found in the generated images. Please try again or try another prompt.",
            ) from url_exception


class ImageGenAsync:
    """
    Image generation by Microsoft Bing
    Parameters:
        auth_cookie: str
    """

    def __init__(self, auth_cookie: str, quiet: bool = False) -> None:
        self.session = aiohttp.ClientSession(
            headers=HEADERS,
            cookies={"_U": auth_cookie},
            trust_env=True,
        )
        self.quiet = quiet

    async def __aenter__(self):
        return self

    async def __aexit__(self, *excinfo) -> None:
        await self.session.close()

    async def get_images(self, prompt: str) -> list:
        """
        Fetches image links from Bing
        Parameters:
            prompt: str
        """
        if not self.quiet:
            print("Sending request...")
        url_encoded_prompt = requests.utils.quote(prompt)
        # https://www.bing.com/images/create?q=<PROMPT>&rt=3&FORM=GENCRE
        url = f"{BING_URL}/images/create?q={url_encoded_prompt}&rt=4&FORM=GENCRE"
        payload = f"q={url_encoded_prompt}&qs=ds"
        async with self.session.post(
            url, allow_redirects=False, data=payload
        ) as response:
            content = await response.text()
            if "this prompt has been blocked" in content.lower():
                raise Exception(
                    "Your prompt has been blocked by Bing. Try to change any bad words and try again.",
                )
            if response.status != 302:
                # if rt4 fails, try rt3
                url = (
                    f"{BING_URL}/images/create?q={url_encoded_prompt}&rt=3&FORM=GENCRE"
                )
                async with self.session.post(
                    url,
                    allow_redirects=False,
                    timeout=200,
                ) as response3:
                    if response3.status != 302:
                        print(f"ERROR: {await response3.text()}")
                        raise Exception("Redirect failed")
                    response = response3
        # Get redirect URL
        redirect_url = response.headers["Location"].replace("&nfy=1", "")
        request_id = redirect_url.split("id=")[-1]
        await self.session.get(f"{BING_URL}{redirect_url}")
        # https://www.bing.com/images/create/async/results/{ID}?q={PROMPT}
        polling_url = f"{BING_URL}/images/create/async/results/{request_id}?q={url_encoded_prompt}"
        # Poll for results
        if not self.quiet:
            print("Waiting for results...")
        while True:
            if not self.quiet:
                print(".", end="", flush=True)
            # By default, timeout is 300s, change as needed
            response = await self.session.get(polling_url)
            if response.status != 200:
                raise Exception("Could not get results")
            content = await response.text()
            if content and content.find("errorMessage") == -1:
                break

            await asyncio.sleep(1)
            continue
        # Use regex to search for src=""
        image_links = regex.findall(r'src="([^"]+)"', content)
        # Remove size limit
        normal_image_links = [link.split("?w=")[0] for link in image_links]
        # Remove duplicates
        normal_image_links = list(set(normal_image_links))

        # Bad images
        bad_images = [
            "https://r.bing.com/rp/in-2zU3AJUdkgFe7ZKv19yPBHVs.png",
            "https://r.bing.com/rp/TX9QuO3WzcCJz1uaaSwQAz39Kb0.jpg",
        ]
        for im in normal_image_links:
            if im in bad_images:
                raise Exception("Bad images")
        # No images
        if not normal_image_links:
            raise Exception("No images")
        return normal_image_links

    async def save_images(self, links: list, output_dir: str) -> None:
        """
        Saves images to output directory
        """
        if not self.quiet:
            print("\nDownloading images...")
        with contextlib.suppress(FileExistsError):
            os.mkdir(output_dir)
        try:
            jpeg_index = 0
            for link in links:
                while os.path.exists(os.path.join(output_dir, f"{jpeg_index}.jpeg")):
                    jpeg_index += 1
                async with self.session.get(link, raise_for_status=True) as response:
                    # save response to file
                    with open(
                        os.path.join(output_dir, f"{jpeg_index}.jpeg"), "wb"
                    ) as output_file:
                        async for chunk in response.content.iter_chunked(8192):
                            output_file.write(chunk)
        except aiohttp.client_exceptions.InvalidURL as url_exception:
            raise Exception(
                "Inappropriate contents found in the generated images. Please try again or try another prompt.",
            ) from url_exception


async def async_image_gen(args) -> None:
    async with ImageGenAsync(args.U, args.quiet) as image_generator:
        images = await image_generator.get_images(args.prompt)
        await image_generator.save_images(images, output_dir=args.output_dir)


def main():
    parser = argparse.ArgumentParser()
    parser.add_argument("-U", help="Auth cookie from browser", type=str)
    parser.add_argument("--cookie-file", help="File containing auth cookie", type=str)
    parser.add_argument(
        "--prompt",
        help="Prompt to generate images for",
        type=str,
        required=True,
    )

    parser.add_argument(
        "--output-dir",
        help="Output directory",
        type=str,
        default="./output",
    )

    parser.add_argument(
        "--debug-file",
        help="Path to the file where debug information will be written.",
        type=str,
    )

    parser.add_argument(
        "--quiet",
        help="Disable pipeline messages",
        action="store_true",
    )
    parser.add_argument(
        "--asyncio",
        help="Run ImageGen using asyncio",
        action="store_true",
    )
    parser.add_argument(
        "--version",
        action="store_true",
        help="Print the version number",
    )

    args = parser.parse_args()

    if args.version:
        print(pkg_resources.get_distribution("BingImageCreator").version)
        sys.exit()

    # Load auth cookie
    cookie_json = None
    if args.cookie_file is not None:
        with contextlib.suppress(Exception):
            with open(args.cookie_file, encoding="utf-8") as file:
                cookie_json = json.load(file)

    if args.U is None and args.cookie_file is None:
        raise Exception("Could not find auth cookie")

    if not args.asyncio:
        # Create image generator
        image_generator = ImageGen(
            args.U, args.debug_file, args.quiet, all_cookies=cookie_json
        )
        image_generator.save_images(
            image_generator.get_images(args.prompt),
            output_dir=args.output_dir,
        )
    else:
        asyncio.run(async_image_gen(args))


if __name__ == "__main__":
    main()