import argparse
from fastapi import FastAPI
from pydantic import BaseModel
from loguru import logger
from typing import Optional
import numpy as np
import uvicorn
import json
import os
import torch
import torchvision
import torchvision.transforms.functional as TF
from lightx2v.common.ops import *

from lightx2v.utils.registry_factory import RUNNER_REGISTER
from lightx2v.models.runners.hunyuan.hunyuan_runner import HunyuanRunner
from lightx2v.models.runners.wan.wan_runner import WanRunner
from lightx2v.models.runners.wan.wan_distill_runner import WanDistillRunner
from lightx2v.models.runners.wan.wan_causvid_runner import WanCausVidRunner
from lightx2v.models.runners.wan.wan_skyreels_v2_df_runner import WanSkyreelsV2DFRunner

from lightx2v.utils.profiler import ProfilingContext
from lightx2v.utils.set_config import set_config
from lightx2v.utils.service_utils import TaskStatusMessage, BaseServiceStatus, ProcessManager, TensorTransporter, ImageTransporter

tensor_transporter = TensorTransporter()
image_transporter = ImageTransporter()

# =========================
# FastAPI Related Code
# =========================

runner = None

app = FastAPI()


class Message(BaseModel):
    task_id: str
    task_id_must_unique: bool = False

    img: Optional[bytes] = None
    latents: Optional[bytes] = None

    def get(self, key, default=None):
        return getattr(self, key, default)


class VAEServiceStatus(BaseServiceStatus):
    pass


class VAERunner:
    def __init__(self, config):
        self.config = config
        self.runner_cls = RUNNER_REGISTER[self.config.model_cls]

        self.runner = self.runner_cls(config)
        self.runner.vae_encoder, self.runner.vae_decoder = self.runner.load_vae()

    def _run_vae_encoder(self, img):
        img = image_transporter.load_image(img)
        vae_encoder_out, kwargs = self.runner.run_vae_encoder(img)
        return vae_encoder_out, kwargs

    def _run_vae_decoder(self, latents):
        latents = tensor_transporter.load_tensor(latents)
        images = self.runner.vae_decoder.decode(latents, generator=None, config=self.config)
        return images


def run_vae_encoder(message: Message):
    try:
        global runner
        vae_encoder_out, kwargs = runner._run_vae_encoder(message.img)
        VAEServiceStatus.complete_task(message)
        return vae_encoder_out, kwargs
    except Exception as e:
        logger.error(f"task_id {message.task_id} failed: {str(e)}")
        VAEServiceStatus.record_failed_task(message, error=str(e))


def run_vae_decoder(message: Message):
    try:
        global runner
        images = runner._run_vae_decoder(message.latents)
        VAEServiceStatus.complete_task(message)
        return images
    except Exception as e:
        logger.error(f"task_id {message.task_id} failed: {str(e)}")
        VAEServiceStatus.record_failed_task(message, error=str(e))


@app.post("/v1/local/vae_model/encoder/generate")
def v1_local_vae_model_encoder_generate(message: Message):
    try:
        task_id = VAEServiceStatus.start_task(message)
        vae_encoder_out, kwargs = run_vae_encoder(message)
        output = tensor_transporter.prepare_tensor(vae_encoder_out)
        del vae_encoder_out
        return {"task_id": task_id, "task_status": "completed", "output": output, "kwargs": kwargs}
    except RuntimeError as e:
        return {"error": str(e)}


@app.post("/v1/local/vae_model/decoder/generate")
def v1_local_vae_model_decoder_generate(message: Message):
    try:
        task_id = VAEServiceStatus.start_task(message)
        vae_decode_out = run_vae_decoder(message)
        output = tensor_transporter.prepare_tensor(vae_decode_out)
        del vae_decode_out
        return {"task_id": task_id, "task_status": "completed", "output": output, "kwargs": None}
    except RuntimeError as e:
        return {"error": str(e)}


@app.get("/v1/local/vae_model/generate/service_status")
async def get_service_status():
    return VAEServiceStatus.get_status_service()


@app.get("/v1/local/vae_model/encoder/generate/service_status")
async def get_service_status():
    return VAEServiceStatus.get_status_service()


@app.get("/v1/local/vae_model/decoder/generate/service_status")
async def get_service_status():
    return VAEServiceStatus.get_status_service()


@app.get("/v1/local/vae_model/encoder/generate/get_all_tasks")
async def get_all_tasks():
    return VAEServiceStatus.get_all_tasks()


@app.get("/v1/local/vae_model/decoder/generate/get_all_tasks")
async def get_all_tasks():
    return VAEServiceStatus.get_all_tasks()


@app.post("/v1/local/vae_model/encoder/generate/task_status")
async def get_task_status(message: TaskStatusMessage):
    return VAEServiceStatus.get_status_task_id(message.task_id)


@app.post("/v1/local/vae_model/decoder/generate/task_status")
async def get_task_status(message: TaskStatusMessage):
    return VAEServiceStatus.get_status_task_id(message.task_id)


# =========================
# Main Entry
# =========================

if __name__ == "__main__":
    ProcessManager.register_signal_handler()
    parser = argparse.ArgumentParser()
    parser.add_argument("--model_cls", type=str, required=True, choices=["wan2.1", "hunyuan", "wan2.1_distill", "wan2.1_causvid", "wan2.1_skyreels_v2_df", "cogvideox"], default="hunyuan")
    parser.add_argument("--task", type=str, choices=["t2v", "i2v"], default="t2v")
    parser.add_argument("--model_path", type=str, required=True)
    parser.add_argument("--config_json", type=str, required=True)

    parser.add_argument("--port", type=int, default=9004)
    args = parser.parse_args()
    logger.info(f"args: {args}")

    with ProfilingContext("Init Server Cost"):
        config = set_config(args)
        logger.info(f"config:\n{json.dumps(config, ensure_ascii=False, indent=4)}")
        runner = VAERunner(config)

    uvicorn.run(app, host="0.0.0.0", port=config.port, reload=False, workers=1)
