# built-in dependencies
from typing import Union, cast, Any, Tuple, Dict

# 3rd party dependencies
from flask import Blueprint, request
from numpy.typing import NDArray

# project dependencies
from deepface import __version__
from deepface.api.src.modules.core import service
from deepface.api.src.dependencies.variables import Variables
from deepface.api.src.dependencies.container import Container
from deepface.commons import image_utils
from deepface.commons.logger import Logger

logger = Logger()

blueprint = Blueprint("routes", __name__)


# pylint: disable=no-else-return, broad-except


@blueprint.route("/")
def home() -> str:
    return f"<h1>Welcome to DeepFace API v{__version__}!</h1>"


def extract_image_from_request(img_key: str) -> Union[str, NDArray[Any]]:
    """
    Extracts an image from the request either from json or a multipart/form-data file.

    Args:
        img_key (str): The key used to retrieve the image data
            from the request (e.g., 'img1').

    Returns:
        img (str or np.ndarray): Given image detail (base64 encoded string, image path or url)
            or the decoded image as a numpy array.
    """

    # Check if the request is multipart/form-data (file input)
    if request.files:
        # request.files is instance of werkzeug.datastructures.ImmutableMultiDict
        # file is instance of werkzeug.datastructures.FileStorage
        file = request.files.get(img_key)

        if file is None:
            raise ValueError(f"Request form data doesn't have {img_key}")

        if file.filename == "":
            raise ValueError(f"No file uploaded for '{img_key}'")

        np_img: NDArray[Any] = image_utils.load_image_from_file_storage(file)

        return np_img
    # Check if the request is coming as base64, file path or url from json or form data
    elif request.is_json or request.form:
        input_args = request.get_json() or request.form.to_dict()

        if input_args is None:
            raise ValueError("empty input set passed")

        # this can be base64 encoded image, and image path or url
        str_img: str = cast(str, input_args.get(img_key))

        if not str_img:
            raise ValueError(f"'{img_key}' not found in either json or form data request")

        return str_img

    # If neither JSON nor file input is present
    raise ValueError(f"'{img_key}' not found in request in either json or form data")


@blueprint.route("/represent", methods=["POST"])
def represent() -> Tuple[Dict[str, Any], int]:
    # load injected container
    container: Container = blueprint.container  # type: ignore[attr-defined]
    if not container.auth_service.validate(request.headers):
        return {"message": "Invalid or missing authentication token"}, 401

    input_args = (request.is_json and request.get_json()) or (
        request.form and request.form.to_dict()
    )

    try:
        img = extract_image_from_request("img")
    except Exception as err:
        return {"exception": str(err)}, 400

    max_faces = input_args.get("max_faces")

    obj, status_code = service.represent(
        img_path=img,
        model_name=input_args.get("model_name", "VGG-Face"),
        detector_backend=input_args.get("detector_backend", "opencv"),
        enforce_detection=bool(input_args.get("enforce_detection", True)),
        align=bool(input_args.get("align", True)),
        anti_spoofing=bool(input_args.get("anti_spoofing", False)),
        max_faces=int(max_faces) if max_faces is not None else None,
    )

    logger.debug(obj)

    return obj, status_code


@blueprint.route("/verify", methods=["POST"])
def verify() -> Tuple[Dict[str, Any], int]:
    # load injected container
    container: Container = blueprint.container  # type: ignore[attr-defined]
    if not container.auth_service.validate(request.headers):
        return {"message": "Invalid or missing authentication token"}, 401

    input_args = (request.is_json and request.get_json()) or (
        request.form and request.form.to_dict()
    )

    try:
        img1 = extract_image_from_request("img1")
    except Exception as err:
        return {"exception": str(err)}, 400

    try:
        img2 = extract_image_from_request("img2")
    except Exception as err:
        return {"exception": str(err)}, 400

    verification, status_code = service.verify(
        img1_path=img1,
        img2_path=img2,
        model_name=input_args.get("model_name", "VGG-Face"),
        detector_backend=input_args.get("detector_backend", "opencv"),
        distance_metric=input_args.get("distance_metric", "cosine"),
        align=bool(input_args.get("align", True)),
        enforce_detection=bool(input_args.get("enforce_detection", True)),
        anti_spoofing=bool(input_args.get("anti_spoofing", False)),
    )

    logger.debug(verification)

    return verification, status_code


@blueprint.route("/analyze", methods=["POST"])
def analyze() -> Tuple[Dict[str, Any], int]:
    # load injected container
    container: Container = blueprint.container  # type: ignore[attr-defined]
    if not container.auth_service.validate(request.headers):
        return {"message": "Invalid or missing authentication token"}, 401

    input_args = (request.is_json and request.get_json()) or (
        request.form and request.form.to_dict()
    )

    try:
        img = extract_image_from_request("img")
    except Exception as err:
        return {"exception": str(err)}, 400

    actions = input_args.get("actions", ["age", "gender", "emotion", "race"])
    # actions is the only argument instance of list or tuple
    # if request is form data, input args can either be text or file
    if isinstance(actions, str):
        actions = (
            actions.replace("[", "")
            .replace("]", "")
            .replace("(", "")
            .replace(")", "")
            .replace('"', "")
            .replace("'", "")
            .replace(" ", "")
            .split(",")
        )

    demographies, status_code = service.analyze(
        img_path=img,
        actions=actions,
        detector_backend=input_args.get("detector_backend", "opencv"),
        enforce_detection=bool(input_args.get("enforce_detection", True)),
        align=bool(input_args.get("align", True)),
        anti_spoofing=bool(input_args.get("anti_spoofing", False)),
    )

    logger.debug(demographies)

    return demographies, status_code


@blueprint.route("/register", methods=["POST"])
def register() -> Tuple[Dict[str, Any], int]:
    # load injected variables and container
    variables: Variables = blueprint.variables  # type: ignore[attr-defined]
    container: Container = blueprint.container  # type: ignore[attr-defined]
    if not container.auth_service.validate(request.headers):
        return {"message": "Invalid or missing authentication token"}, 401

    if variables.conection_details is None:
        return {
            "error": "Database connection details must be provided in `DEEPFACE_CONNECTION_DETAILS`"
            " environment variables"
        }, 500

    input_args = (request.is_json and request.get_json()) or (
        request.form and request.form.to_dict()
    )

    try:
        img = extract_image_from_request("img")
    except Exception as err:
        return {"exception": str(err)}, 400

    result, status_code = service.register(
        img=img,
        img_name=input_args.get("img_name"),
        model_name=input_args.get("model_name", "VGG-Face"),
        detector_backend=input_args.get("detector_backend", "opencv"),
        enforce_detection=bool(input_args.get("enforce_detection", True)),
        align=bool(input_args.get("align", True)),
        l2_normalize=bool(input_args.get("l2_normalize", False)),
        expand_percentage=int(input_args.get("expand_percentage", 0)),
        normalization=input_args.get("normalization", "base"),
        anti_spoofing=bool(input_args.get("anti_spoofing", False)),
        database_type=variables.database_type,
        connection_details=variables.conection_details,
    )

    if status_code == 200:
        logger.info("An image has been registered to the database.")
    else:
        logger.error("An error occurred while registering an image to the database.")

    return result, status_code


@blueprint.route("/search", methods=["POST"])
def search() -> Tuple[Dict[str, Any], int]:
    # load injected variables and container
    variables: Variables = blueprint.variables  # type: ignore[attr-defined]
    container: Container = blueprint.container  # type: ignore[attr-defined]
    if not container.auth_service.validate(request.headers):
        return {"message": "Invalid or missing authentication token"}, 401

    if variables.conection_details is None:
        return {
            "error": "Database connection details must be provided in `DEEPFACE_CONNECTION_DETAILS`"
            " environment variables"
        }, 500

    input_args = (request.is_json and request.get_json()) or (
        request.form and request.form.to_dict()
    )

    try:
        img = extract_image_from_request("img")
    except Exception as err:
        return {"exception": str(err)}, 400

    return service.search(
        img=img,
        model_name=input_args.get("model_name", "VGG-Face"),
        detector_backend=input_args.get("detector_backend", "opencv"),
        enforce_detection=bool(input_args.get("enforce_detection", True)),
        align=bool(input_args.get("align", True)),
        distance_metric=input_args.get("distance_metric", "cosine"),
        l2_normalize=bool(input_args.get("l2_normalize", False)),
        database_type=variables.database_type,
        connection_details=variables.conection_details,
        search_method=input_args.get("search_method", "exact"),
        expand_percentage=int(input_args.get("expand_percentage", 0)),
        normalization=input_args.get("normalization", "base"),
        anti_spoofing=bool(input_args.get("anti_spoofing", False)),
        similarity_search=bool(input_args.get("similarity_search", False)),
        k=int(input_args.get("k", 5)) if input_args.get("k") is not None else None,
    )


@blueprint.route("/build/index", methods=["POST"])
def build_index() -> Tuple[Dict[str, Any], int]:
    # load injected variables and container
    variables: Variables = blueprint.variables  # type: ignore[attr-defined]
    container: Container = blueprint.container  # type: ignore[attr-defined]
    if not container.auth_service.validate(request.headers):
        return {"message": "Invalid or missing authentication token"}, 401

    if variables.conection_details is None:
        return {
            "error": "Database connection details must be provided in `DEEPFACE_CONNECTION_DETAILS`"
            " environment variables"
        }, 500

    input_args = (request.is_json and request.get_json()) or (
        request.form and request.form.to_dict()
    )

    return service.build_index(
        model_name=input_args.get("model_name", "VGG-Face"),
        detector_backend=input_args.get("detector_backend", "opencv"),
        align=bool(input_args.get("align", True)),
        l2_normalize=bool(input_args.get("l2_normalize", False)),
        database_type=variables.database_type,
        connection_details=variables.conection_details,
    )