import gzip
import os
from io import BytesIO
from pathlib import Path

import httpx
from fastapi import status
from PIL import Image, ImageFile, UnidentifiedImageError

from config import ENABLE_SCHEDULED_CONVERT_IMAGES_TO_WEBP, RESOURCES_BASE_PATH
from config.config_manager import MetadataMediaType
from logger.logger import log
from models.collection import Collection
from models.rom import Rom
from tasks.scheduled.convert_images_to_webp import ImageConverter
from utils.context import ctx_httpx_client

from .base_handler import CoverSize, FSHandler


class FSResourcesHandler(FSHandler):
    def __init__(self) -> None:
        super().__init__(base_path=RESOURCES_BASE_PATH)
        self.image_converter = ImageConverter()

    def get_platform_resources_path(self, platform_id: int) -> str:
        return os.path.join("roms", str(platform_id))

    # Cover art
    def cover_exists(self, entity: Rom | Collection, size: CoverSize) -> bool:
        """Check if rom cover exists in filesystem

        Args:
            fs_slug: short name of the platform
            rom_name: name of rom file
            size: size of the cover
        Returns
            True if cover exists in filesystem else False
        """
        full_path = self.validate_path(f"{entity.fs_resources_path}/cover")
        for _ in full_path.glob(f"{size.value}.*"):
            return True  # At least one file found
        return False

    def resize_cover_to_small(self, cover: ImageFile.ImageFile, save_path: str) -> None:
        """Resize cover to small size, and save it to filesystem."""
        if cover.height >= 1000:
            ratio = 0.2
        else:
            ratio = 0.4

        small_width = int(cover.width * ratio)
        small_height = int(cover.height * ratio)
        small_size = (small_width, small_height)
        small_img = cover.resize(small_size)

        small_img.save(save_path)

    async def _store_cover(
        self, entity: Rom | Collection, url_cover: str, size: CoverSize
    ) -> None:
        """Store roms resources in filesystem

        Args:
            fs_slug: short name of the platform
            rom_name: name of rom file
            url_cover: url to get the cover
            size: size of the cover
        """
        cover_file = f"{entity.fs_resources_path}/cover"
        await self.make_directory(cover_file)

        # Handle file:// URLs for gamelist.xml
        if url_cover.startswith("file://"):
            try:
                file_path = Path(url_cover[7:])  # Remove "file://" prefix
                if file_path.exists():
                    # Copy the file to the resources directory
                    dest_path = f"{cover_file}/{size.value}.png"
                    await self.copy_file(file_path, dest_path)

                    if ENABLE_SCHEDULED_CONVERT_IMAGES_TO_WEBP:
                        self.image_converter.convert_to_webp(
                            self.validate_path(f"{cover_file}/{size.value}.png"),
                            force=True,
                        )
                else:
                    log.warning(f"Cover file not found: {file_path}")
                    return None
            except Exception as exc:
                log.error(f"Unable to copy cover file {url_cover}: {str(exc)}")
                return None
        else:
            # Handle HTTP URLs
            httpx_client = ctx_httpx_client.get()
            try:
                async with httpx_client.stream(
                    "GET", url_cover, timeout=120
                ) as response:
                    if response.status_code == status.HTTP_200_OK:
                        # Check if content is gzipped from response headers
                        is_gzipped = (
                            response.headers.get("content-encoding", "").lower()
                            == "gzip"
                        )

                        async with await self.write_file_streamed(
                            path=cover_file, filename=f"{size.value}.png"
                        ) as f:
                            if is_gzipped:
                                # Content is gzipped, decompress it
                                content = await response.aread()
                                try:
                                    decompressed_content = gzip.decompress(content)
                                    await f.write(decompressed_content)
                                except gzip.BadGzipFile:
                                    await f.write(content)
                            else:
                                # Content is not gzipped, stream directly
                                async for chunk in response.aiter_raw():
                                    await f.write(chunk)

                        if ENABLE_SCHEDULED_CONVERT_IMAGES_TO_WEBP:
                            self.image_converter.convert_to_webp(
                                self.validate_path(f"{cover_file}/{size.value}.png"),
                                force=True,
                            )
            except httpx.TransportError as exc:
                log.error(f"Unable to fetch cover at {url_cover}: {str(exc)}")
                return None

        if size == CoverSize.SMALL:
            try:
                image_path = self.validate_path(f"{cover_file}/{size.value}.png")
                with Image.open(image_path) as img:
                    self.resize_cover_to_small(img, save_path=str(image_path))

                if ENABLE_SCHEDULED_CONVERT_IMAGES_TO_WEBP:
                    self.image_converter.convert_to_webp(
                        self.validate_path(f"{cover_file}/{size.value}.png"), force=True
                    )
            except UnidentifiedImageError as exc:
                log.error(f"Unable to identify image {cover_file}: {str(exc)}")
                return None

    def _get_cover_path(self, entity: Rom | Collection, size: CoverSize) -> str | None:
        """Returns rom cover filesystem path adapted to frontend folder structure

        Args:
            entity: Rom or Collection object
            size: size of the cover
        """
        full_path = self.validate_path(f"{entity.fs_resources_path}/cover")
        for matched_file in full_path.glob(f"{size.value}.*"):
            return str(matched_file.relative_to(self.base_path))

        return None

    async def get_cover(
        self, entity: Rom | Collection | None, overwrite: bool, url_cover: str | None
    ) -> tuple[str | None, str | None]:
        if not entity:
            return None, None

        # Download covers if URL provided and (overwriting or covers don't exist)
        if url_cover:
            if overwrite or not self.cover_exists(entity, CoverSize.SMALL):
                await self._store_cover(entity, url_cover, CoverSize.SMALL)
            if overwrite or not self.cover_exists(entity, CoverSize.BIG):
                await self._store_cover(entity, url_cover, CoverSize.BIG)

        # Return paths for existing covers
        path_cover_s = (
            self._get_cover_path(entity, CoverSize.SMALL)
            if self.cover_exists(entity, CoverSize.SMALL)
            else None
        )
        path_cover_l = (
            self._get_cover_path(entity, CoverSize.BIG)
            if self.cover_exists(entity, CoverSize.BIG)
            else None
        )

        return path_cover_s, path_cover_l

    async def remove_cover(self, entity: Rom | Collection | None):
        if not entity:
            return {"path_cover_s": "", "path_cover_l": ""}

        await self.remove_directory(f"{entity.fs_resources_path}/cover")

        return {"path_cover_s": "", "path_cover_l": ""}

    async def _build_artwork_path(
        self, entity: Rom | Collection, file_ext: str
    ) -> tuple[Path, Path]:
        path_cover = f"{entity.fs_resources_path}/cover"
        path_cover_l = self.validate_path(
            f"{path_cover}/{CoverSize.BIG.value}.{file_ext}"
        )
        path_cover_s = self.validate_path(
            f"{path_cover}/{CoverSize.SMALL.value}.{file_ext}"
        )

        await self.make_directory(path_cover)

        return path_cover_l, path_cover_s

    async def store_artwork(
        self, entity: Rom | Collection, artwork: BytesIO, file_ext: str
    ) -> tuple[str | None, str | None]:
        """Store artwork in filesystem and return paths."""
        path_cover_l, path_cover_s = await self._build_artwork_path(entity, file_ext)

        try:
            with Image.open(artwork) as img:
                img.save(path_cover_l)
                self.resize_cover_to_small(img, save_path=str(path_cover_s))

                if ENABLE_SCHEDULED_CONVERT_IMAGES_TO_WEBP:
                    self.image_converter.convert_to_webp(path_cover_l, force=True)
                    self.image_converter.convert_to_webp(path_cover_s, force=True)
        except UnidentifiedImageError as exc:
            log.error(
                f"Unable to identify image for {entity.fs_resources_path}: {str(exc)}"
            )
            return None, None

        return str(path_cover_l.relative_to(self.base_path)), str(
            path_cover_s.relative_to(self.base_path)
        )

    # Screenshots
    async def _store_screenshot(self, rom: Rom, url_screenhot: str, idx: int):
        """Store roms resources in filesystem

        Args:
            rom: Rom object
            url_screenhot: URL to get the screenshot
        """
        screenshot_path = f"{rom.fs_resources_path}/screenshots"
        await self.make_directory(screenshot_path)

        # Handle file:// URLs for gamelist.xml
        if url_screenhot.startswith("file://"):
            try:
                file_path = Path(url_screenhot[7:])  # Remove "file://" prefix
                if file_path.exists():
                    # Copy the file to the resources directory
                    await self.copy_file(file_path, f"{screenshot_path}/{idx}.jpg")
                else:
                    log.warning(f"Screenshot file not found: {file_path}")
                    return None
            except Exception as exc:
                log.error(f"Unable to copy screenshot file {url_screenhot}: {str(exc)}")
                return None
        else:
            # Handle HTTP URLs
            httpx_client = ctx_httpx_client.get()
            try:
                async with httpx_client.stream(
                    "GET", url_screenhot, timeout=120
                ) as response:
                    if response.status_code == status.HTTP_200_OK:
                        # Check if content is gzipped from response headers
                        is_gzipped = (
                            response.headers.get("content-encoding", "").lower()
                            == "gzip"
                        )

                        async with await self.write_file_streamed(
                            path=screenshot_path, filename=f"{idx}.jpg"
                        ) as f:
                            if is_gzipped:
                                # Content is gzipped, decompress it
                                content = await response.aread()
                                try:
                                    decompressed_content = gzip.decompress(content)
                                    await f.write(decompressed_content)
                                except gzip.BadGzipFile:
                                    await f.write(content)
                            else:
                                # Content is not gzipped, stream directly
                                async for chunk in response.aiter_raw():
                                    await f.write(chunk)
            except httpx.TransportError as exc:
                log.error(f"Unable to fetch screenshot at {url_screenhot}: {str(exc)}")
                return None

    def screenshots_exist(self, rom: Rom) -> bool:
        """Check if rom screenshots exist in filesystem

        Args:
            rom: Rom object
        Returns
            True if screenshots exists in filesystem else False
        """
        full_path = self.validate_path(f"{rom.fs_resources_path}/screenshots")
        for _ in full_path.glob("*.jpg"):
            return True
        return False

    def _get_screenshot_path(self, rom: Rom, idx: str):
        """Returns rom cover filesystem path adapted to frontend folder structure

        Args:
            rom: Rom object
            idx: index number of screenshot
        """
        return f"{rom.fs_resources_path}/screenshots/{idx}.jpg"

    async def get_rom_screenshots(
        self, rom: Rom, overwrite: bool, url_screenshots: list | None
    ) -> list[str]:
        """Get rom screenshots from filesystem

        Args:
            rom: Rom object
            overwrite: Whether to overwrite existing screenshots
            url_screenshots: List of URLs to download screenshots from
        Returns
            List of paths to screenshots
        """
        # Return existing screenshots if no URLs provided
        # Or if not overwriting and screenshots already exist
        if not url_screenshots or (not overwrite and self.screenshots_exist(rom)):
            return rom.path_screenshots or []

        # Download and store new screenshots
        path_screenshots: list[str] = []
        for idx, url_screenshot in enumerate(url_screenshots):
            await self._store_screenshot(rom, url_screenshot, idx)
            path_screenshots.append(self._get_screenshot_path(rom, str(idx)))

        return path_screenshots

    # Manuals
    def manual_exists(self, rom: Rom) -> bool:
        """Check if rom manual exists in filesystem

        Args:
            rom: Rom object
        Returns
            True if manual exists in filesystem else False
        """
        full_path = self.validate_path(f"{rom.fs_resources_path}/manual")
        for _ in full_path.glob(f"{rom.id}.pdf"):
            return True
        return False

    async def _store_manual(self, rom: Rom, url_manual: str):
        manual_path = f"{rom.fs_resources_path}/manual"
        await self.make_directory(manual_path)

        # Handle file:// URLs for gamelist.xml
        if url_manual.startswith("file://"):
            try:
                file_path = Path(url_manual[7:])  # Remove "file://" prefix
                if file_path.exists():
                    # Copy the file to the resources directory
                    await self.copy_file(file_path, f"{manual_path}/{rom.id}.pdf")
                else:
                    log.warning(f"Manual file not found: {file_path}")
                    return None
            except Exception as exc:
                log.error(f"Unable to copy manual file {url_manual}: {str(exc)}")
                return None
        else:
            # Handle HTTP URL
            httpx_client = ctx_httpx_client.get()
            try:
                async with httpx_client.stream(
                    "GET", url_manual, timeout=120
                ) as response:
                    if response.status_code == status.HTTP_200_OK:
                        # Check if content is gzipped from response headers
                        is_gzipped = (
                            response.headers.get("content-encoding", "").lower()
                            == "gzip"
                        )

                        async with await self.write_file_streamed(
                            path=manual_path, filename=f"{rom.id}.pdf"
                        ) as f:
                            if is_gzipped:
                                # Decompress gzipped content
                                content = await response.aread()
                                try:
                                    decompressed_content = gzip.decompress(content)
                                    await f.write(decompressed_content)
                                except gzip.BadGzipFile:
                                    await f.write(content)
                            else:
                                # Content is not gzipped, stream directly
                                async for chunk in response.aiter_raw():
                                    await f.write(chunk)
            except httpx.TransportError as exc:
                log.error(f"Unable to fetch manual at {url_manual}: {str(exc)}")
                return None

    def _get_manual_path(self, rom: Rom) -> str | None:
        """Returns rom manual filesystem path adapted to frontend folder structure

        Args:
            rom: Rom object
        """
        full_path = self.validate_path(f"{rom.fs_resources_path}/manual")
        for matched_file in full_path.glob(f"{rom.id}.pdf"):
            return str(matched_file.relative_to(self.base_path))

        return None

    async def get_manual(
        self, rom: Rom, overwrite: bool, url_manual: str | None
    ) -> str | None:
        if not url_manual or (not overwrite and self.manual_exists(rom)):
            return rom.path_manual or None

        # Download and store new manual
        await self._store_manual(rom, url_manual)
        return self._get_manual_path(rom)

    async def remove_manual(self, rom: Rom):
        await self.remove_directory(f"{rom.fs_resources_path}/manual")

    # Retroachievements
    async def store_ra_badge(self, url: str, path: str) -> None:
        httpx_client = ctx_httpx_client.get()
        directory, filename = os.path.split(path)

        # Ensure destination directory exists
        await self.make_directory(directory)

        if await self.file_exists(path):
            log.debug(f"Badge {path} already exists, skipping download")
            return

        try:
            async with httpx_client.stream("GET", url, timeout=120) as response:
                if response.status_code == status.HTTP_200_OK:
                    async with await self.write_file_streamed(
                        path=directory, filename=filename
                    ) as f:
                        async for chunk in response.aiter_raw():
                            await f.write(chunk)
        except httpx.TransportError as exc:
            log.error(f"Unable to fetch cover at {url}: {str(exc)}")

    def get_ra_resources_path(self, platform_id: int, rom_id: int) -> str:
        return os.path.join(
            "roms",
            str(platform_id),
            str(rom_id),
            "retroachievements",
        )

    def get_ra_badges_path(self, platform_id: int, rom_id: int) -> str:
        return os.path.join(self.get_ra_resources_path(platform_id, rom_id), "badges")

    # Mixed media
    def get_media_resources_path(
        self,
        platform_id: int,
        rom_id: int,
        media_type: MetadataMediaType,
    ) -> str:
        return os.path.join("roms", str(platform_id), str(rom_id), media_type.value)

    async def store_media_file(self, url: str, dest_path: str) -> None:
        httpx_client = ctx_httpx_client.get()
        directory, filename = os.path.split(dest_path)

        if await self.file_exists(dest_path):
            log.debug(f"Media file {dest_path} already exists, skipping download")
            return

        # Ensure destination directory exists
        await self.make_directory(directory)

        # Handle file:// URLs for gamelist.xml
        if url.startswith("file://"):
            try:
                file_path = Path(url[7:])  # Remove "file://" prefix
                if file_path.exists():
                    await self.copy_file(file_path, dest_path)
            except Exception as exc:
                log.error(f"Unable to copy media file {url}: {str(exc)}")
                return None
        else:
            # Handle HTTP URLs
            httpx_client = ctx_httpx_client.get()
            try:
                async with httpx_client.stream("GET", url, timeout=120) as response:
                    if response.status_code == status.HTTP_200_OK:
                        async with await self.write_file_streamed(
                            path=directory, filename=filename
                        ) as f:
                            async for chunk in response.aiter_raw():
                                await f.write(chunk)
            except httpx.TransportError as exc:
                log.error(f"Unable to fetch media file at {url}: {str(exc)}")
                return None

    async def remove_media_resources_path(
        self,
        platform_id: int,
        rom_id: int,
        media_type: MetadataMediaType,
    ) -> None:
        await self.remove_directory(
            self.get_media_resources_path(platform_id, rom_id, media_type)
        )