#!/usr/bin/env python3
"""FastAPI 入口：AI 图片生成服务。"""

from dotenv import load_dotenv

load_dotenv()
import base64
import re
from fastapi import FastAPI, File, Form, HTTPException, UploadFile
from fastapi.staticfiles import StaticFiles
from pydantic import BaseModel, Field, model_validator

from utils.mm_api_t2i import OUTPUT_DIR, PROVIDERS, generate_images
from utils.agnes_image import VALID_RATIOS, generate_images as agnes_generate_images

app = FastAPI(title="AI Image T2I API", version="1.0.0")
OUTPUT_DIR.mkdir(parents=True, exist_ok=True)
app.mount("/output", StaticFiles(directory=OUTPUT_DIR), name="output")


class ImageGenerationRequest(BaseModel):
    prompt: str = Field(min_length=1, description="图片提示词")
    provider: str = Field(default="grok", pattern="^(grok|gpt)$", description="模型提供方")
    model: str | None = Field(default=None, description="覆盖提供方默认模型")
    size: str = Field(default="1024x1024", description="图片尺寸")
    n: int = Field(default=1, ge=1, le=10, description="生成数量")
    profile_name: str = Field(pattern=r"^[\w-]+$", description="调用方标识（必填），图片会保存到 output/<profile_name>/ 下")

    @model_validator(mode="before")
    @classmethod
    def check_profile_name(cls, data):
        if isinstance(data, dict) and not data.get("profile_name"):
            raise ValueError("缺少 profile_name 参数，请在请求中带上你的 agent/profile 名称")
        return data


class GeneratedImage(BaseModel):
    filename: str
    url: str
    bytes: int


class ImageGenerationResponse(BaseModel):
    provider: str
    model: str
    images: list[GeneratedImage]


@app.get("/health")
def health_check():
    return {"status": "ok"}


@app.post("/images/generations", response_model=ImageGenerationResponse)
def generate_images_endpoint(request: ImageGenerationRequest):
    result = generate_images(
        provider=request.provider,
        model=request.model,
        prompt=request.prompt,
        size=request.size,
        n=request.n,
        profile_name=request.profile_name,
    )
    return ImageGenerationResponse(**result)


class AgnesImageGenerationRequest(BaseModel):
    prompt: str = Field(min_length=1, description="图片提示词")
    size: str = Field(default="1K", description="输出尺寸档位: 1K / 2K / 3K / 4K，也支持精确尺寸如 1024x1024")
    ratio: str | None = Field(default=None, description=f"宽高比，支持 {sorted(VALID_RATIOS)}；与 size 档位配合使用")
    images: list[str] | None = Field(default=None, description="图生图 / 多图合成的输入图像 URL 或 Data URI Base64")
    profile_name: str = Field(pattern=r"^[\w-]+$", description="调用方标识（必填），图片会保存到 output/<profile_name>/ 下")

    @model_validator(mode="before")
    @classmethod
    def check_profile_name(cls, data):
        if isinstance(data, dict) and not data.get("profile_name"):
            raise ValueError("缺少 profile_name 参数，请在请求中带上你的 agent/profile 名称")
        return data


class AgnesImageGenerationResponse(BaseModel):
    model: str
    size: str
    ratio: str
    images: list[GeneratedImage]


@app.post("/agnes/images/generations", response_model=AgnesImageGenerationResponse)
def agnes_generate_images_endpoint(request: AgnesImageGenerationRequest):
    result = agnes_generate_images(
        prompt=request.prompt,
        size=request.size,
        ratio=request.ratio,
        images=request.images,
        profile_name=request.profile_name,
    )
    return AgnesImageGenerationResponse(**result)


_ALLOWED_IMAGE_TYPES = {"image/png", "image/jpeg", "image/jpg", "image/webp"}


@app.post("/agnes/images/generations/upload", response_model=AgnesImageGenerationResponse)
def agnes_generate_images_upload_endpoint(
    prompt: str = Form(..., description="图片提示词"),
    profile_name: str = Form(..., description="调用方标识（必填）"),
    size: str = Form(default="1K", description="输出尺寸档位: 1K / 2K / 3K / 4K"),
    ratio: str | None = Form(default=None, description=f"宽高比，支持 {sorted(VALID_RATIOS)}"),
    images: list[UploadFile] = File(default=[], description="参考图像文件，可传多个"),
):
    """multipart/form-data 版图生图：上传本地图片文件直接测试，无需 base64。"""
    if not prompt.strip():
        raise HTTPException(status_code=422, detail="prompt 不能为空")
    if not re.match(r"^[\w-]+$", profile_name):
        raise HTTPException(status_code=422, detail="profile_name 只能包含字母数字下划线和短横线")
    if not images or all(not f.filename for f in images):
        raise HTTPException(status_code=422, detail="必须至少上传一张参考图 images")

    data_uris: list[str] = []
    for f in images:
        if f.content_type and f.content_type not in _ALLOWED_IMAGE_TYPES:
            raise HTTPException(status_code=400, detail=f"不支持的图片类型: {f.content_type}")
        raw = f.file.read()
        if not raw:
            raise HTTPException(status_code=400, detail=f"上传的图片 {f.filename} 为空")
        mime = f.content_type or "image/png"
        b64 = base64.b64encode(raw).decode("ascii")
        data_uris.append(f"data:{mime};base64,{b64}")

    result = agnes_generate_images(
        prompt=prompt,
        size=size,
        ratio=ratio,
        images=data_uris,
        profile_name=profile_name,
    )
    return AgnesImageGenerationResponse(**result)


if __name__ == "__main__":
    import uvicorn

    uvicorn.run(app, host="0.0.0.0", port=8000)