import logging
import io
from pathlib import Path
from typing import List
from PIL import Image

from fastapi import APIRouter, Form, UploadFile, HTTPException
from fastapi.responses import Response

logger = logging.getLogger(__name__)

router = APIRouter()

plugin = None


def set_plugin_instance(plugin_instance):
    global plugin
    plugin = plugin_instance


@router.get("/status")
async def get_status():
    if plugin is None:
        return {
            "name": "image",
            "enabled": False,
            "message": "插件未加载",
        }
    return plugin.get_status()


@router.post("/upload")
async def upload_image(file: UploadFile):
    if plugin is None or not plugin.enabled:
        raise HTTPException(status_code=400, detail="插件未启用")

    allowed_extensions = {".png", ".jpg", ".jpeg", ".gif", ".bmp", ".webp"}
    ext = Path(file.filename).suffix.lower()

    if ext not in allowed_extensions:
        raise HTTPException(
            status_code=400,
            detail=f"不支持的文件格式: {ext}，仅支持 {', '.join(allowed_extensions)}",
        )

    content_bytes = await file.read()

    try:
        image = Image.open(io.BytesIO(content_bytes))
        image_format = image.format or "PNG"

        sizes = [16, 32, 48, 128]
        available_sizes = []

        for size in sizes:
            if image.width >= size and image.height >= size:
                available_sizes.append(size)

        if not available_sizes:
            raise HTTPException(
                status_code=400,
                detail=f"图片尺寸 ({image.width}x{image.height}) 小于最小要求 16x16",
            )

        return {
            "filename": file.filename,
            "original_size": {"width": image.width, "height": image.height},
            "format": image_format,
            "available_sizes": available_sizes,
            "sizes": sizes,
        }

    except Exception as e:
        logger.error(f"处理图片失败: {e}")
        raise HTTPException(status_code=400, detail=f"图片处理失败: {str(e)}")


@router.post("/generate")
async def generate_image(
    file: UploadFile, size: int = Form(...), format: str = Form("PNG")
):
    if plugin is None or not plugin.enabled:
        raise HTTPException(status_code=400, detail="插件未启用")

    if size not in [16, 32, 48, 128]:
        raise HTTPException(
            status_code=400, detail="不支持的尺寸，仅支持 16, 32, 48, 128"
        )

    if format.upper() not in ["PNG", "JPEG", "WEBP"]:
        raise HTTPException(
            status_code=400, detail="不支持的格式，仅支持 PNG, JPEG, WEBP"
        )

    content_bytes = await file.read()

    try:
        image = Image.open(io.BytesIO(content_bytes))

        if image.width < size or image.height < size:
            raise HTTPException(
                status_code=400,
                detail=f"图片尺寸 ({image.width}x{image.height}) 小于请求尺寸 {size}x{size}",
            )

        resized = image.resize((size, size), Image.Resampling.LANCZOS)

        output = io.BytesIO()
        save_format = format.upper() if format.upper() != "JPEG" else "JPEG"
        resized.save(output, format=save_format, quality=95)
        output.seek(0)

        content_type = {
            "PNG": "image/png",
            "JPEG": "image/jpeg",
            "WEBP": "image/webp",
        }.get(format.upper(), "image/png")

        ext = {"PNG": ".png", "JPEG": ".jpg", "WEBP": ".webp"}.get(
            format.upper(), ".png"
        )

        filename = f"icon{size}{ext}"

        return Response(
            content=output.read(),
            media_type=content_type,
            headers={"Content-Disposition": f'attachment; filename="{filename}"'},
        )

    except HTTPException:
        raise
    except Exception as e:
        logger.error(f"生成图片失败: {e}")
        raise HTTPException(status_code=400, detail=f"生成图片失败: {str(e)}")