from __future__ import annotations

import copy
import json
import os
import sys
import time
import zipfile
from typing import TYPE_CHECKING, Optional, Union

import requests
from dotenv import load_dotenv
from tqdm import tqdm

from roboflow.adapters import rfapi
from roboflow.config import (
    API_URL,
    APP_URL,
    DEMO_KEYS,
    TQDM_DISABLE,
    TYPE_CLASSICATION,
    TYPE_INSTANCE_SEGMENTATION,
    TYPE_KEYPOINT_DETECTION,
    TYPE_OBJECT_DETECTION,
    TYPE_SEMANTIC_SEGMENTATION,
    UNIVERSE_URL,
)
from roboflow.core.dataset import Dataset
from roboflow.models.classification import ClassificationModel
from roboflow.models.instance_segmentation import InstanceSegmentationModel
from roboflow.models.keypoint_detection import KeypointDetectionModel
from roboflow.models.object_detection import ObjectDetectionModel
from roboflow.models.semantic_segmentation import SemanticSegmentationModel
from roboflow.util.annotations import amend_data_yaml
from roboflow.util.general import write_line
from roboflow.util.model_processor import process
from roboflow.util.versions import get_model_format, get_wrong_dependencies_versions, normalize_yolo_model_type

if TYPE_CHECKING:
    import numpy as np

    from roboflow.models.inference import InferenceModel

load_dotenv()


class Version:
    """
    Class representing a Roboflow dataset version.
    """

    model: Optional[InferenceModel]

    def __init__(
        self,
        version_dict,
        type,
        api_key,
        name,
        version,
        model_format,
        local: Optional[str],
        workspace,
        project,
        public,
        colors=None,
    ):
        """
        Initialize a Version object.
        """
        if api_key:
            self.__api_key = api_key
            self.name = name
            self.version = unwrap_version_id(version_id=version)
            self.type = type
            self.augmentation = version_dict["augmentation"]
            self.created = version_dict["created"]
            self.id = version_dict["id"]
            self.images = version_dict["images"]
            self.preprocessing = version_dict["preprocessing"]
            self.splits = version_dict["splits"]
            self.model_format = model_format
            self.workspace = workspace
            self.project = project
            self.public = public
            self.colors = {} if colors is None else colors

            self.colors = colors
            if "exports" in version_dict.keys():
                self.exports = version_dict["exports"]
            else:
                self.exports = []

            version_without_workspace = os.path.basename(str(version))

            try:
                version_response = rfapi.get_version(self.__api_key, workspace, project, self.version)
                version_info = version_response.get("version", {})
                has_model = bool(version_info.get("train", {}).get("model"))
            except rfapi.RoboflowError:
                has_model = False

            if not has_model:
                self.model = None
            elif self.type == TYPE_OBJECT_DETECTION:
                self.model = ObjectDetectionModel(
                    self.__api_key,
                    self.id,
                    self.name,
                    version_without_workspace,
                    local=local,
                    colors=self.colors,
                    preprocessing=self.preprocessing,
                )
            elif self.type == TYPE_CLASSICATION:
                self.model = ClassificationModel(
                    self.__api_key,
                    self.id,
                    self.name,
                    version_without_workspace,
                    local=local,
                    colors=self.colors,
                    preprocessing=self.preprocessing,
                )
            elif self.type == TYPE_INSTANCE_SEGMENTATION:
                self.model = InstanceSegmentationModel(
                    self.__api_key,
                    self.id,
                    colors=self.colors,
                    preprocessing=self.preprocessing,
                    local=local,
                )
            elif self.type == TYPE_SEMANTIC_SEGMENTATION:
                self.model = SemanticSegmentationModel(self.__api_key, self.id)
            elif self.type == TYPE_KEYPOINT_DETECTION:
                self.model = KeypointDetectionModel(self.__api_key, self.id, version=version_without_workspace)
            else:
                self.model = None

        elif DEMO_KEYS:
            api_key = DEMO_KEYS[0]
            if api_key == "coco-128-sample":
                self.__api_key = api_key
                self.model_format = model_format
                self.name = "coco-128"
                self.version = "1"
            else:
                self.__api_key = api_key
                self.model_format = model_format
                self.name = "chess-pieces-new"
                self.version = "23"
                self.id = "joseph-nelson/chess-pieces-new"

    def __check_if_generating(self):
        # check Roboflow API to see if this version is still generating
        versiondict = rfapi.get_version(
            api_key=self.__api_key,
            workspace_url=self.workspace,
            project_url=self.project,
            version=self.version,
            nocache=True,
        )
        version_obj = versiondict.get("version", {})
        progress = 0.0 if version_obj.get("progress") is None else float(version_obj.get("progress"))
        generating = bool(version_obj.get("generating") or version_obj.get("images", 0) == 0)
        return generating, progress

    def __wait_if_generating(self, recurse=False):
        # checks if a given version is still in the progress of generating

        still_generating, progress = self.__check_if_generating()

        if still_generating:
            progress_message = "Generating version still in progress. Progress: " + str(round(progress * 100, 2)) + "%"
            sys.stdout.write("\r" + progress_message)
            sys.stdout.flush()
            time.sleep(5)
            return self.__wait_if_generating(recurse=True)

        else:
            if recurse:
                sys.stdout.write("\n")
                sys.stdout.flush()
            return

    def download(self, model_format=None, location=None, overwrite: bool = False):
        """
        Download and extract a ZIP of a version's dataset in a given format

        :param model_format: A format to use for downloading
        :param location: An optional path for saving the file
        :param overwrite: An optional flag to prevent dataset overwrite when dataset is already downloaded

        Args:
            model_format (str): A format to use for downloading
            location (str): An optional path for saving the file
            overwrite (bool): An optional flag to overwrite an existing dataset if the dataset has already downloaded

        Returns:
            Dataset Object

        Raises:
            RuntimeError: If the Roboflow API returns an error with a helpful JSON body
            HTTPError: If the Network/Roboflow API fails and does not return JSON
        """  # noqa: E501 // docs

        self.__wait_if_generating()

        model_format = self.__get_format_identifier(model_format)

        if model_format not in self.exports:
            self.export(model_format)

        # if model_format is not in

        if location is None:
            location = self.__get_download_location()
        if os.path.exists(location) and not overwrite:
            return Dataset(self.name, self.version, model_format, os.path.abspath(location))

        if self.__api_key == "coco-128-sample":
            link = "https://app.roboflow.com/ds/n9QwXwUK42?key=NnVCe2yMxP"
        else:
            workspace, project, *_ = self.id.rsplit("/")
            try:
                export_info = rfapi.get_version_export(
                    api_key=self.__api_key,
                    workspace_url=workspace,
                    project_url=project,
                    version=self.version,
                    format=model_format,
                )
            except rfapi.RoboflowError as e:
                raise RuntimeError(str(e))

            if "ready" in export_info and export_info.get("ready") is False:
                raise RuntimeError(export_info)

            link = export_info["export"]["link"]

        self.__download_zip(link, location, model_format)
        self.__extract_zip(location, model_format)
        self.__reformat_yaml(location, model_format)  # TODO: is roboflow-python a place to be munging yaml files?

        return Dataset(self.name, self.version, model_format, os.path.abspath(location))

    def export(self, model_format=None) -> bool | None:
        """
        Ask the Roboflow API to generate a version's dataset in a given format so that it can be downloaded via the `download()` method.

        The export will be asynchronously generated and available for download after some amount of seconds - depending on dataset size.

        Args:
            model_format (str): A format to use for downloading

        Returns:
            True if the export was successful, RuntimeError if the export failed

        Raises:
            RuntimeError: If the Roboflow API returns an error with a helpful JSON body
            HTTPError: If the Network/Roboflow API fails and does not return JSON
        """  # noqa: E501 // docs

        model_format = self.__get_format_identifier(model_format)

        self.__wait_if_generating()

        workspace, project, *_ = self.id.rsplit("/")
        export_info = rfapi.get_version_export(
            api_key=self.__api_key,
            workspace_url=workspace,
            project_url=project,
            version=self.version,
            format=model_format,
        )
        while "ready" in export_info and export_info.get("ready") is False:
            progress = export_info.get("progress", 0.0)
            progress_message = (
                "Exporting format " + model_format + " in progress : " + str(round(progress * 100, 2)) + "%"
            )
            sys.stdout.write("\r" + progress_message)
            sys.stdout.flush()
            time.sleep(1)
            export_info = rfapi.get_version_export(
                api_key=self.__api_key,
                workspace_url=workspace,
                project_url=project,
                version=self.version,
                format=model_format,
            )
        if "export" in export_info:
            sys.stdout.write("\n")
            print("\r" + "Version export complete for " + model_format + " format")
            sys.stdout.flush()
            return True
        else:
            raise RuntimeError(f"Unexpected export {export_info}")

    def train(self, speed=None, model_type=None, checkpoint=None, plot_in_notebook=False) -> InferenceModel:
        """
        Ask the Roboflow API to train a previously exported version's dataset.

        Args:
            speed: Whether to train quickly or accurately. Note: accurate training is a paid feature. Default speed is `fast`.
            model_type: The type of model to train. Default depends on kind of project. It takes precedence over speed. You can check the list of model ids by sending an invalid parameter in this argument.
            checkpoint: A string representing the checkpoint to use while training
            plot: Whether to plot the training results. Default is `False`.

        Returns:
            An instance of the trained model class

        Raises:
            RuntimeError: If the Roboflow API returns an error with a helpful JSON body
            HTTPError: If the Network/Roboflow API fails and does not return JSON
        """  # noqa: E501 // docs

        self.__wait_if_generating()

        train_model_format = get_model_format(model_type)
        if train_model_format not in self.exports:
            self.export(train_model_format)

        workspace, project, *_ = self.id.rsplit("/")

        payload_speed = speed if speed else None
        payload_checkpoint = checkpoint if checkpoint else None
        payload_model_type = model_type if model_type else None

        write_line("Reaching out to Roboflow to start training...")

        rfapi.start_version_training(
            api_key=self.__api_key,
            workspace_url=workspace,
            project_url=project,
            version=self.version,
            speed=payload_speed,
            checkpoint=payload_checkpoint,
            model_type=payload_model_type,
        )

        status = "training"

        if plot_in_notebook:
            from IPython.display import clear_output
            from matplotlib import pyplot as plt

            def live_plot(epochs, mAP, loss, title=""):
                clear_output(wait=True)

                plt.subplot(2, 1, 1)
                plt.plot(epochs, mAP, "#00FFCE")
                plt.title(title)
                plt.ylabel("mAP")

                plt.subplot(2, 1, 2)
                plt.plot(epochs, loss, "#A351FB")
                plt.xlabel("epochs")
                plt.ylabel("loss")
                plt.show()

        first_graph_write = False
        previous_epochs: Union[np.ndarray, list] = []
        num_machine_spin_dots = []

        while status == "training" or status == "running":
            version_response = rfapi.get_version(
                api_key=self.__api_key,
                workspace_url=self.workspace,
                project_url=self.project,
                version=self.version,
                nocache=True,
            )
            version = version_response.get("version", {})
            if "models" in version.keys():
                models = version["models"]
            else:
                models = {}

            if "train" in version.keys():
                if "results" in version["train"].keys():
                    status = "finished"
                    break
                if "status" in version["train"].keys():
                    if version["train"]["status"] == "failed":
                        write_line(line="Training failed")
                        break

            epochs: Union[np.ndarray, list]
            mAP: Union[np.ndarray, list]
            loss: Union[np.ndarray, list]

            if "roboflow-train" in models.keys():
                import numpy as np

                # training has started
                epochs = np.array([int(epoch["epoch"]) for epoch in models["roboflow-train"]["epochs"]])
                mAP = np.array([float(epoch["mAP"]) for epoch in models["roboflow-train"]["epochs"]])
                loss = np.array(
                    [
                        sum(float(epoch[key]) for key in ["box_loss", "class_loss", "obj_loss"] if key in epoch)
                        for epoch in models["roboflow-train"]["epochs"]
                    ]
                )

                title = "Training in Progress"
                # plottling logic
            else:
                num_machine_spin_dots.append(".")
                if len(num_machine_spin_dots) > 5:
                    num_machine_spin_dots = ["."]
                title = "Training Machine Spinning Up" + "".join(num_machine_spin_dots)

                epochs = []
                mAP = []
                loss = []

            if (len(epochs) > len(previous_epochs)) or (len(epochs) == 0):
                if plot_in_notebook:
                    live_plot(epochs, mAP, loss, title)
                else:
                    if len(epochs) > 0:
                        title = (
                            title + ": Epoch: " + str(epochs[-1]) + " mAP: " + str(mAP[-1]) + " loss: " + str(loss[-1])
                        )
                    if not first_graph_write:
                        write_line(title)
                        first_graph_write = True

            previous_epochs = copy.deepcopy(epochs)

            time.sleep(5)

        if not self.model:
            if self.type == TYPE_OBJECT_DETECTION:
                self.model = ObjectDetectionModel(
                    self.__api_key,
                    self.id,
                    self.name,
                    self.version,
                    colors=self.colors,
                    preprocessing=self.preprocessing,
                )
            elif self.type == TYPE_CLASSICATION:
                self.model = ClassificationModel(
                    self.__api_key,
                    self.id,
                    self.name,
                    self.version,
                    colors=self.colors,
                    preprocessing=self.preprocessing,
                )
            elif self.type == TYPE_INSTANCE_SEGMENTATION:
                self.model = InstanceSegmentationModel(
                    self.__api_key,
                    self.id,
                    colors=self.colors,
                    preprocessing=self.preprocessing,
                )
            elif self.type == TYPE_SEMANTIC_SEGMENTATION:
                self.model = SemanticSegmentationModel(self.__api_key, self.id)
            elif self.type == TYPE_KEYPOINT_DETECTION:
                self.model = KeypointDetectionModel(self.__api_key, self.id, version=self.version)
            else:
                raise ValueError(f"Unsupported model type: {self.type}")

        # return the model object
        assert self.model
        return self.model

    # @warn_for_wrong_dependencies_versions([("ultralytics", "==", "8.0.196")])
    def deploy(self, model_type: str, model_path: str, filename: str = "weights/best.pt") -> None:
        """Uploads provided weights file to Roboflow.

        Args:
            model_type (str): The type of the model to be deployed.
            model_path (str): File path to the model weights to be uploaded.
            filename (str, optional): The name of the weights file. Defaults to "weights/best.pt".
        """
        model_type = normalize_yolo_model_type(model_type)
        zip_file_name = process(model_type, model_path, filename)

        if zip_file_name is None:
            raise RuntimeError("Failed to process model")

        self._upload_zip(model_type, model_path, zip_file_name)

    def _upload_zip(self, model_type: str, model_path: str, model_file_name: str):
        res = requests.get(
            f"{API_URL}/{self.workspace}/{self.project}/{self.version}"
            f"/uploadModel?api_key={self.__api_key}&modelType={model_type}&nocache=true"
        )
        try:
            if res.status_code == 429:
                raise RuntimeError(
                    "This version already has a trained model. Please generate and"
                    " train a new version in order to upload model to Roboflow."
                )
            else:
                res.raise_for_status()
        except Exception as e:
            print(f"An error occured when getting the model upload URL: {e}")
            return

        res = requests.put(
            res.json()["url"],
            data=open(os.path.join(model_path, model_file_name), "rb"),
        )
        try:
            res.raise_for_status()

            if self.public:
                print(
                    f"View the status of your deployment at: {APP_URL}/{self.workspace}/{self.project}/{self.version}"
                )
                print(
                    "Share your model with the world at:"
                    f" {UNIVERSE_URL}/{self.workspace}/{self.project}/"
                    f"model/{self.version}"
                )
            else:
                print(
                    f"View the status of your deployment at: {APP_URL}/{self.workspace}/{self.project}/{self.version}"
                )

        except Exception as e:
            print(f"An error occured when uploading the model: {e}")

    def __download_zip(self, link, location, format):
        """
        Download a dataset's zip file from the given URL and save it in the desired location

        Args:
            link (str): link the URL of the remote zip file
            location (str): filepath of the data directory to save the zip file to
            format (str): the format identifier string
        """  # noqa: E501 // docs
        if not os.path.exists(location):
            os.makedirs(location)

        def bar_progress(current, total, width=80):
            progress_message = (
                f"Downloading Dataset Version Zip in {location} to {format}: "
                f"{current / total * 100:.0f}% [{current} / {total}] bytes"
            )
            sys.stdout.write("\r" + progress_message)
            sys.stdout.flush()

        try:
            response = requests.get(link, stream=True)

            # write the zip file to the desired location
            with open(location + "/roboflow.zip", "wb") as f:
                total_length = int(response.headers.get("content-length"))  # type: ignore[arg-type]
                desc = None if TQDM_DISABLE else f"Downloading Dataset Version Zip in {location} to {format}:"
                for chunk in tqdm(
                    response.iter_content(chunk_size=1024),
                    desc=desc,
                    total=int(total_length / 1024) + 1,
                ):
                    if chunk:
                        f.write(chunk)
                        f.flush()

        except Exception as e:
            print(f"Error when trying to download dataset @ {link}")
            raise e
        sys.stdout.write("\n")
        sys.stdout.flush()

    def __extract_zip(self, location, format):
        """
        Extracts the contents of a downloaded ZIP file and then deletes the zipped file.

        Args:
            location (str): filepath of the data directory that contains the ZIP file
            format (str): the format identifier string

        Raises:
            RuntimeError: If there is an error unzipping the file
        """  # noqa: E501 // docs
        desc = None if TQDM_DISABLE else f"Extracting Dataset Version Zip to {location} in {format}:"
        with zipfile.ZipFile(location + "/roboflow.zip", "r") as zip_ref:
            for member in tqdm(
                zip_ref.infolist(),
                desc=desc,
            ):
                try:
                    zip_ref.extract(member, location)
                except zipfile.error:
                    raise RuntimeError("Error unzipping download")

        os.remove(location + "/roboflow.zip")

    def __get_download_location(self):
        """
        Get the local path to save a downloaded dataset to

        Returns:
            str: the local path
        """
        version_slug = self.name.replace(" ", "-")
        filename = f"{version_slug}-{self.version}"

        directory = os.environ.get("DATASET_DIRECTORY")
        if directory:
            return f"{directory}/{filename}"

        return filename

    def __get_download_url(self, format):
        """
        Get the Roboflow API URL for downloading (and exporting downloadable zips)

        Args:
            format (str): the format identifier string

        Returns:
            str: the Roboflow API URL
        """
        workspace, project, *_ = self.id.rsplit("/")
        return f"{API_URL}/{workspace}/{project}/{self.version}/{format}"

    def __get_format_identifier(self, format):
        """
        If `format` is none, fall back to the instance's `model_format` value.

        If a human readable format name was passed, return the identifier that should be used for Roboflow API calls

        Otherwise, assume that the passed in format is also the identifier

        Args:
            format (str): a human readable format string

        Returns:
            str: format identifier string
        """  # noqa: E501 // docs
        if not format:
            format = self.model_format

        if not format:
            raise RuntimeError(
                "You must pass a format argument to version.download() or define a model in your Roboflow object"
            )

        friendly_formats = {"yolov5": "yolov5pytorch", "yolov7": "yolov7pytorch"}

        return friendly_formats.get(format, format)

    def __reformat_yaml(self, location: str, format: str):
        """
        Certain formats seem to require reformatting the downloaded YAML.

        Args:
            location (str): filepath of the data directory that contains the yaml file
            format (str): the format identifier string
        """  # noqa: E501 // docs
        data_path = os.path.join(location, "data.yaml")

        def data_yaml_callback(content: dict) -> dict:
            if format == "mt-yolov6":
                content["train"] = location + content["train"].lstrip(".")
                content["val"] = location + content["val"].lstrip(".")
                content["test"] = location + content["test"].lstrip(".")
            if format in ["yolov5pytorch", "yolov7pytorch"]:
                content["train"] = location + content["train"].lstrip("..")
                content["val"] = location + content["val"].lstrip("..")
            try:
                # get_wrong_dependencies_versions raises exception if ultralytics is not installed at all  # noqa: E501 // docs
                if format == "yolov8" and not get_wrong_dependencies_versions(
                    dependencies_versions=[("ultralytics", "==", "8.0.196")]
                ):
                    content["train"] = "train/images"
                    content["val"] = "valid/images"
                    content["test"] = "test/images"
            except ModuleNotFoundError:
                pass
            return content

        if format in ["yolov5pytorch", "mt-yolov6", "yolov7pytorch", "yolov8", "yolov9"]:
            amend_data_yaml(path=data_path, callback=data_yaml_callback)

    def __str__(self):
        """
        String representation of version object.
        """
        json_value = {
            "name": self.name,
            "type": self.type,
            "version": self.version,
            "augmentation": self.augmentation,
            "created": self.created,
            "preprocessing": self.preprocessing,
            "splits": self.splits,
            "workspace": self.workspace,
        }
        return json.dumps(json_value, indent=2)


def unwrap_version_id(version_id: str) -> str:
    return version_id if "/" not in str(version_id) else version_id.split("/")[-1]
