from typing import List

import numpy as np
from fastapi import FastAPI, Body
from fastapi.exceptions import HTTPException
from PIL import Image

import gradio as gr

from modules.api.models import *
from modules.api import api

from scripts import external_code, global_state
from scripts.processor import preprocessor_filters
from scripts.logging import logger


def encode_to_base64(image):
    if type(image) is str:
        return image
    elif type(image) is Image.Image:
        return api.encode_pil_to_base64(image)
    elif type(image) is np.ndarray:
        return encode_np_to_base64(image)
    else:
        return ""


def encode_np_to_base64(image):
    pil = Image.fromarray(image)
    return api.encode_pil_to_base64(pil)


def controlnet_api(_: gr.Blocks, app: FastAPI):
    @app.get("/controlnet/version")
    async def version():
        return {"version": external_code.get_api_version()}

    @app.get("/controlnet/model_list")
    async def model_list(update: bool = True):
        up_to_date_model_list = external_code.get_models(update=update)
        logger.debug(up_to_date_model_list)
        return {"model_list": up_to_date_model_list}

    @app.get("/controlnet/module_list")
    async def module_list(alias_names: bool = False):
        _module_list = external_code.get_modules(alias_names)
        logger.debug(_module_list)

        return {
            "module_list": _module_list,
            "module_detail": external_code.get_modules_detail(alias_names),
        }

    @app.get("/controlnet/control_types")
    async def control_types():
        def format_control_type(
            filtered_preprocessor_list,
            filtered_model_list,
            default_option,
            default_model,
        ):
            return {
                "module_list": filtered_preprocessor_list,
                "model_list": filtered_model_list,
                "default_option": default_option,
                "default_model": default_model,
            }

        return {
            "control_types": {
                control_type: format_control_type(
                    *global_state.select_control_type(control_type)
                )
                for control_type in preprocessor_filters.keys()
            }
        }

    @app.get("/controlnet/settings")
    async def settings():
        max_models_num = external_code.get_max_models_num()
        return {"control_net_unit_count": max_models_num}

    cached_cn_preprocessors = global_state.cache_preprocessors(
        global_state.cn_preprocessor_modules
    )

    @app.post("/controlnet/detect")
    async def detect(
        controlnet_module: str = Body("none", title="Controlnet Module"),
        controlnet_input_images: List[str] = Body([], title="Controlnet Input Images"),
        controlnet_processor_res: int = Body(
            512, title="Controlnet Processor Resolution"
        ),
        controlnet_threshold_a: float = Body(64, title="Controlnet Threshold a"),
        controlnet_threshold_b: float = Body(64, title="Controlnet Threshold b"),
    ):
        controlnet_module = global_state.reverse_preprocessor_aliases.get(
            controlnet_module, controlnet_module
        )

        if controlnet_module not in cached_cn_preprocessors:
            raise HTTPException(status_code=422, detail="Module not available")

        if len(controlnet_input_images) == 0:
            raise HTTPException(status_code=422, detail="No image selected")

        logger.info(
            f"Detecting {str(len(controlnet_input_images))} images with the {controlnet_module} module."
        )

        results = []
        poses = []

        processor_module = cached_cn_preprocessors[controlnet_module]

        for input_image in controlnet_input_images:
            img = external_code.to_base64_nparray(input_image)

            class JsonAcceptor:
                def __init__(self) -> None:
                    self.value = None

                def accept(self, json_dict: dict) -> None:
                    self.value = json_dict

            json_acceptor = JsonAcceptor()

            results.append(
                processor_module(
                    img,
                    res=controlnet_processor_res,
                    thr_a=controlnet_threshold_a,
                    thr_b=controlnet_threshold_b,
                    json_pose_callback=json_acceptor.accept,
                )[0]
            )

            if "openpose" in controlnet_module:
                assert json_acceptor.value is not None
                poses.append(json_acceptor.value)

        global_state.cn_preprocessor_unloadable.get(controlnet_module, lambda: None)()
        results64 = list(map(encode_to_base64, results))
        res = {"images": results64, "info": "Success"}
        if poses:
            res["poses"] = poses

        return res


try:
    import modules.script_callbacks as script_callbacks

    script_callbacks.on_app_started(controlnet_api)
except:
    pass