import json
import os
import pathlib
import uuid
from typing import Callable, NoReturn

import gradio as gr
import uvicorn
from fastapi import FastAPI, HTTPException, Request, status
from fastapi.exceptions import RequestValidationError
from fastapi.responses import FileResponse, HTMLResponse, JSONResponse
from fastapi.staticfiles import StaticFiles
from fastapi.templating import Jinja2Templates
from lisa_on_cuda.utils import app_helpers, frontend_builder, create_folders_and_variables_if_not_exists
from pydantic import ValidationError
from spaces import GPU as SPACES_GPU

from samgis_core.utilities.fastapi_logger import setup_logging
from samgis_lisa_on_zero import PROJECT_ROOT_FOLDER, WORKDIR
from samgis_lisa_on_zero.utilities.type_hints import ApiRequestBody, StringPromptApiRequestBody


loglevel = os.getenv('LOGLEVEL', 'INFO').upper()
app_logger = setup_logging(debug=loglevel == "DEBUG")

VITE_INDEX_URL = os.getenv("VITE_INDEX_URL", "/")
VITE_SAMGIS_URL = os.getenv("VITE_SAMGIS_URL", "/samgis")
VITE_LISA_URL = os.getenv("VITE_LISA_URL", "/lisa")
VITE_GRADIO_URL = os.getenv("VITE_GRADIO_URL", "/gradio")
FASTAPI_TITLE = "samgis-lisa-on-zero"
app = FastAPI(title=FASTAPI_TITLE, version="1.0")


def get_gradio_interface_geojson(
        fn_inference: Callable
):
    return gr.Interface(
        fn_inference,
        inputs=[
            gr.Textbox(lines=1, placeholder=None, label="Payload input"),
        ],
        outputs=[
            gr.Textbox(lines=1, placeholder=None, label="Geojson Output")
        ]
    )


def handle_exception_response(exception: Exception) -> NoReturn:
    import subprocess
    project_root_folder_content = subprocess.run(
        f"ls -l {PROJECT_ROOT_FOLDER}/", shell=True, universal_newlines=True, stdout=subprocess.PIPE
    )
    app_logger.error(f"project_root folder 'ls -l' command output: {project_root_folder_content.stdout}.")
    workdir_folder_content = subprocess.run(
        f"ls -l {WORKDIR}/", shell=True, universal_newlines=True, stdout=subprocess.PIPE
    )
    app_logger.error(f"workdir folder 'ls -l' command stdout: {workdir_folder_content.stdout}.")
    app_logger.error(f"workdir folder 'ls -l' command stderr: {workdir_folder_content.stderr}.")
    app_logger.error(f"inference error:{exception}.")
    raise HTTPException(
        status_code=status.HTTP_500_INTERNAL_SERVER_ERROR, detail="Internal server error on inference"
    )


@app.middleware("http")
async def request_middleware(request, call_next):
    request_id = str(uuid.uuid4())
    with app_logger.contextualize(request_id=request_id):
        app_logger.info("Request started")

        try:
            response = await call_next(request)

        except Exception as ex_middleware_http:
            app_logger.error(f"Request failed, ex_middleware_http: {ex_middleware_http}")
            response = JSONResponse(content={"success": False}, status_code=500)

        finally:
            response.headers["X-Request-ID"] = request_id
            app_logger.info("Request ended")

        return response


@app.post("/post_test_dictlist")
def post_test_dictlist2(request_input: ApiRequestBody) -> JSONResponse:
    from samgis_lisa_on_zero.io_package.wrappers_helpers import get_parsed_bbox_points_with_dictlist_prompt

    request_body = get_parsed_bbox_points_with_dictlist_prompt(request_input)
    app_logger.info(f"request_body:{request_body}.")
    return JSONResponse(
        status_code=200,
        content=request_body
    )


@app.get("/health")
async def health() -> JSONResponse:
    import importlib.metadata
    from importlib.metadata import PackageNotFoundError

    core_version = lisa_on_cuda_version = samgis_lisa_on_cuda_version = ""
    try:
        core_version = importlib.metadata.version('samgis_core')
        lisa_on_cuda_version = importlib.metadata.version('lisa-on-cuda')
        samgis_lisa_on_cuda_version = importlib.metadata.version('samgis-lisa-on-zero')
    except PackageNotFoundError as pe:
        app_logger.error(f"pe:{pe}.")

    msg = "still alive, "
    msg += f"""version:{samgis_lisa_on_cuda_version}, core version:{core_version},"""
    msg += f"""lisa-on-cuda version:{lisa_on_cuda_version},"""

    app_logger.info(msg)
    return JSONResponse(status_code=200, content={"msg": "still alive..."})


@app.post("/post_test_string")
def post_test_string(request_input: StringPromptApiRequestBody) -> JSONResponse:
    from lisa_on_cuda.utils import app_helpers
    from samgis_lisa_on_zero.io_package.wrappers_helpers import get_parsed_bbox_points_with_string_prompt

    request_body = get_parsed_bbox_points_with_string_prompt(request_input)
    app_logger.info(f"request_body:{request_body}.")
    custom_args = app_helpers.parse_args([])
    request_body["content"] = {**request_body, "precision": str(custom_args.precision)}
    return JSONResponse(
        status_code=200,
        content=request_body
    )


def infer_lisa_gradio(request_input: StringPromptApiRequestBody) -> JSONResponse:
    from samgis_lisa_on_zero.io_package.wrappers_helpers import get_parsed_bbox_points_with_string_prompt, get_source_name
    from samgis_lisa_on_zero.prediction_api import lisa
    from samgis_lisa_on_zero.utilities.constants import LISA_INFERENCE_FN

    app_logger.info("starting lisa inference request...")

    try:
        import time

        time_start_run = time.time()
        body_request = get_parsed_bbox_points_with_string_prompt(request_input)
        app_logger.info(f"lisa body_request:{body_request}.")
        app_logger.info(f"lisa module:{lisa}.")
        try:
            source_name = get_source_name(request_input.source_type)
            app_logger.info(f"source_name = {source_name}.")
            output = lisa.lisa_predict(
                bbox=body_request["bbox"], prompt=body_request["prompt"], zoom=body_request["zoom"],
                source=body_request["source"], source_name=source_name, inference_function_name_key=LISA_INFERENCE_FN
            )
            duration_run = time.time() - time_start_run
            app_logger.info(f"duration_run:{duration_run}.")
            body = {
                "duration_run": duration_run,
                "output": output
            }
            app_logger.info(f"json.dumps(body):{json.dumps(body)}.")
            # return JSONResponse(status_code=200, content={"body": json.dumps(body)})
            return json.dumps(body)
        except Exception as inference_exception:
            handle_exception_response(inference_exception)
    except ValidationError as va1:
        app_logger.error(f"validation error: {str(va1)}.")
        raise ValidationError("Unprocessable Entity")


@app.post("/infer_lisa")
def infer_lisa(request_input: StringPromptApiRequestBody) -> JSONResponse:
    body = infer_lisa_gradio(request_input=request_input)
    return JSONResponse(status_code=200, content={"body": json.dumps(body)})


@app.post("/infer_samgis")
def infer_samgis(request_input: ApiRequestBody) -> JSONResponse:
    from samgis_lisa_on_zero.prediction_api import predictors
    from samgis_lisa_on_zero.io_package.wrappers_helpers import get_parsed_bbox_points_with_dictlist_prompt, get_source_name

    app_logger.info("starting plain samgis inference request...")

    try:
        import time

        time_start_run = time.time()
        body_request = get_parsed_bbox_points_with_dictlist_prompt(request_input)
        app_logger.info(f"body_request:{body_request}.")
        try:
            source_name = get_source_name(request_input.source_type)
            app_logger.info(f"source_name = {source_name}.")
            output = predictors.samexporter_predict(
                bbox=body_request["bbox"], prompt=body_request["prompt"], zoom=body_request["zoom"],
                source=body_request["source"], source_name=source_name
            )
            duration_run = time.time() - time_start_run
            app_logger.info(f"duration_run:{duration_run}.")
            body = {
                "duration_run": duration_run,
                "output": output
            }
            return JSONResponse(status_code=200, content={"body": json.dumps(body)})
        except Exception as inference_exception:
            handle_exception_response(inference_exception)
    except ValidationError as va1:
        app_logger.error(f"validation error: {str(va1)}.")
        raise ValidationError("Unprocessable Entity")


@app.exception_handler(RequestValidationError)
async def request_validation_exception_handler(request: Request, exc: RequestValidationError) -> JSONResponse:
    app_logger.error(f"exception errors: {exc.errors()}.")
    app_logger.error(f"exception body: {exc.body}.")
    headers = request.headers.items()
    app_logger.error(f'request header: {dict(headers)}.')
    params = request.query_params.items()
    app_logger.error(f'request query params: {dict(params)}.')
    return JSONResponse(
        status_code=status.HTTP_422_UNPROCESSABLE_ENTITY,
        content={"msg": "Error - Unprocessable Entity"}
    )


@app.exception_handler(HTTPException)
async def http_exception_handler(request: Request, exc: HTTPException) -> JSONResponse:
    app_logger.error(f"exception: {str(exc)}.")
    headers = request.headers.items()
    app_logger.error(f'request header: {dict(headers)}.')
    params = request.query_params.items()
    app_logger.error(f'request query params: {dict(params)}.')
    return JSONResponse(
        status_code=status.HTTP_500_INTERNAL_SERVER_ERROR,
        content={"msg": "Error - Internal Server Error"}
    )


write_tmp_on_disk = os.getenv("WRITE_TMP_ON_DISK", "")
app_logger.info(f"write_tmp_on_disk:{write_tmp_on_disk}.")
if bool(write_tmp_on_disk):
    try:
        path_write_tmp_on_disk = pathlib.Path(write_tmp_on_disk)
        try:
            pathlib.Path.unlink(path_write_tmp_on_disk, missing_ok=True)
        except (IsADirectoryError, PermissionError, OSError) as err:
            app_logger.error(f"{err} while removing old write_tmp_on_disk:{write_tmp_on_disk}.")
            app_logger.error(f"is file?{path_write_tmp_on_disk.is_file()}.")
            app_logger.error(f"is symlink?{path_write_tmp_on_disk.is_symlink()}.")
            app_logger.error(f"is folder?{path_write_tmp_on_disk.is_dir()}.")
        os.makedirs(write_tmp_on_disk, exist_ok=True)
        app.mount("/vis_output", StaticFiles(directory=write_tmp_on_disk), name="vis_output")
    except RuntimeError as runtime_error:
        app_logger.error(f"{runtime_error} while loading the folder write_tmp_on_disk:{write_tmp_on_disk}...")
        raise runtime_error
    templates = Jinja2Templates(directory=WORKDIR / "static")


    @app.get("/vis_output", response_class=HTMLResponse)
    def list_files(request: Request):

        files = os.listdir(write_tmp_on_disk)
        files_paths = sorted([f"{request.url._url}/{f}" for f in files])
        print(files_paths)
        return templates.TemplateResponse(
            "list_files.html", {"request": request, "files": files_paths}
        )

static_dist_folder = WORKDIR / "static" / "dist"
frontend_builder.build_frontend(
    project_root_folder=frontend_builder.env_project_root_folder,
    input_css_path=frontend_builder.env_input_css_path,
    output_dist_folder=static_dist_folder
)
create_folders_and_variables_if_not_exists.folders_creation()

app_logger.info("build_frontend ok!")

templates = Jinja2Templates(directory="templates")

app.mount("/static", StaticFiles(directory=static_dist_folder, html=True), name="static")
# important: the index() function and the app.mount MUST be at the end
# samgis.html
app.mount(VITE_SAMGIS_URL, StaticFiles(directory=static_dist_folder, html=True), name="samgis")


@app.get(VITE_SAMGIS_URL)
async def samgis() -> FileResponse:
    return FileResponse(path=static_dist_folder / "samgis.html", media_type="text/html")


# lisa.html
app.mount(VITE_LISA_URL, StaticFiles(directory=static_dist_folder, html=True), name="lisa")


@app.get(VITE_LISA_URL)
async def lisa() -> FileResponse:
    return FileResponse(path=static_dist_folder / "lisa.html", media_type="text/html")


# # index.html (lisa.html copy)
app.mount(VITE_INDEX_URL, StaticFiles(directory=static_dist_folder, html=True), name="index")


@app.get(VITE_INDEX_URL)
async def index() -> FileResponse:
    return FileResponse(path=static_dist_folder / "index.html", media_type="text/html")


args = app_helpers.parse_args([])
app_helpers.app_logger.info(f"prepared default arguments:{args}.")
inference_fn = app_helpers.get_inference_model_by_args(args, inference_decorator=SPACES_GPU)

app_helpers.app_logger.info(f"prepared inference_fn function:{inference_fn.__name__}, creating gradio interface...")
# io_package = app_helpers.get_gradio_interface(inference_fn)
io = get_gradio_interface_geojson(infer_lisa_gradio)
app_helpers.app_logger.info(
    f"created gradio interface, mounting gradio app on url {VITE_GRADIO_URL} within FastAPI...")
app = gr.mount_gradio_app(app, io, path=VITE_GRADIO_URL)
app_helpers.app_logger.info("mounted gradio app within fastapi")


if __name__ == '__main__':
    try:
        uvicorn.run(host="0.0.0.0", port=7860, app=app)
    except Exception as ex:
        import logging

        logging.error(f"fastapi/gradio application {FASTAPI_TITLE}, exception:{ex}.")
        print(f"fastapi/gradio application {FASTAPI_TITLE}, exception:{ex}.")
        raise ex