import os
from io import BytesIO
from typing import Any

import cv2
import numpy as np
import uvicorn
from fastapi import Body, Depends, FastAPI
from PIL import Image

from .config import settings
from .models.cache import ModelCache
from .schemas import (
    EmbeddingResponse,
    FaceResponse,
    MessageResponse,
    ModelType,
    TagResponse,
    TextModelRequest,
    TextResponse,
)

app = FastAPI()


def init_state() -> None:
    app.state.model_cache = ModelCache(ttl=settings.model_ttl, revalidate=settings.model_ttl > 0)


async def load_models() -> None:
    models = [
        (settings.classification_model, ModelType.IMAGE_CLASSIFICATION),
        (settings.clip_image_model, ModelType.CLIP),
        (settings.clip_text_model, ModelType.CLIP),
        (settings.facial_recognition_model, ModelType.FACIAL_RECOGNITION),
    ]

    # Get all models
    for model_name, model_type in models:
        await app.state.model_cache.get(model_name, model_type, eager=settings.eager_startup)


@app.on_event("startup")
async def startup_event() -> None:
    init_state()
    await load_models()


def dep_pil_image(byte_image: bytes = Body(...)) -> Image.Image:
    return Image.open(BytesIO(byte_image))


def dep_cv_image(byte_image: bytes = Body(...)) -> cv2.Mat:
    byte_image_np = np.frombuffer(byte_image, np.uint8)
    return cv2.imdecode(byte_image_np, cv2.IMREAD_COLOR)


@app.get("/", response_model=MessageResponse)
async def root() -> dict[str, str]:
    return {"message": "Immich ML"}


@app.get("/ping", response_model=TextResponse)
def ping() -> str:
    return "pong"


@app.post(
    "/image-classifier/tag-image",
    response_model=TagResponse,
    status_code=200,
)
async def image_classification(
    image: Image.Image = Depends(dep_pil_image),
) -> list[str]:
    model = await app.state.model_cache.get(settings.classification_model, ModelType.IMAGE_CLASSIFICATION)
    labels = model.predict(image)
    return labels


@app.post(
    "/sentence-transformer/encode-image",
    response_model=EmbeddingResponse,
    status_code=200,
)
async def clip_encode_image(
    image: Image.Image = Depends(dep_pil_image),
) -> list[float]:
    model = await app.state.model_cache.get(settings.clip_image_model, ModelType.CLIP)
    embedding = model.predict(image)
    return embedding


@app.post(
    "/sentence-transformer/encode-text",
    response_model=EmbeddingResponse,
    status_code=200,
)
async def clip_encode_text(payload: TextModelRequest) -> list[float]:
    model = await app.state.model_cache.get(settings.clip_text_model, ModelType.CLIP)
    embedding = model.predict(payload.text)
    return embedding


@app.post(
    "/facial-recognition/detect-faces",
    response_model=FaceResponse,
    status_code=200,
)
async def facial_recognition(
    image: cv2.Mat = Depends(dep_cv_image),
) -> list[dict[str, Any]]:
    model = await app.state.model_cache.get(settings.facial_recognition_model, ModelType.FACIAL_RECOGNITION)
    faces = model.predict(image)
    return faces


if __name__ == "__main__":
    is_dev = os.getenv("NODE_ENV") == "development"
    uvicorn.run(
        "app.main:app",
        host=settings.host,
        port=settings.port,
        reload=is_dev,
        workers=settings.workers,
    )