from minio import Minio
from minio.error import S3Error
from flask import Flask, current_app
import io
from werkzeug.datastructures import FileStorage

MIB_CONVERTOR = 1_048_576


class MinioClient:
    def __init__(self):
        self.client = None

    def init_app(self, app: Flask):
        self.client = Minio(
            app.config['MINIO_ENDPOINT'],
            access_key=app.config['MINIO_ACCESS_KEY'],
            secret_key=app.config['MINIO_SECRET_KEY'],
            secure=app.config.get('MINIO_USE_HTTPS', False)
        )
        app.logger.info(f"MinIO client initialized with endpoint: {app.config['MINIO_ENDPOINT']}")

    def generate_bucket_name(self, tenant_id):
        tenant_base = current_app.config.get('OBJECT_STORAGE_TENANT_BASE', 'bucket')
        if tenant_base == 'bucket':
            return f"tenant-{tenant_id}-bucket"
        elif tenant_base == 'folder':
            return current_app.config.get('OBJECT_STORAGE_BUCKET_NAME')
        else:
            raise ValueError(f"Invalid OBJECT_STORAGE_TENANT_BASE value: {tenant_base}")

    def create_tenant_bucket(self, tenant_id):
        tenant_base = current_app.config.get('OBJECT_STORAGE_TENANT_BASE', 'bucket')
        if tenant_base == 'bucket':
            bucket_name = self.generate_bucket_name(tenant_id)
            try:
                if not self.client.bucket_exists(bucket_name):
                    self.client.make_bucket(bucket_name)
                    return bucket_name
                return bucket_name
            except S3Error as err:
                raise Exception(f"Error occurred while creating bucket: {err}")
        elif tenant_base == 'folder':   # In this case, we are working within a predefined bucket
            return current_app.config.get('OBJECT_STORAGE_BUCKET_NAME')
        else:
            raise ValueError(f"Invalid OBJECT_STORAGE_TENANT_BASE value: {tenant_base}")

    def generate_object_name(self, tenant_id, document_id, language, version_id, filename):
        tenant_base = current_app.config.get('OBJECT_STORAGE_TENANT_BASE', 'bucket')
        if tenant_base == 'bucket':
            return f"{document_id}/{language}/{version_id}/{filename}"
        elif tenant_base == 'folder':
            return f"tenant-{tenant_id}/documents/{document_id}/{language}/{version_id}/{filename}"
        else:
            raise ValueError(f"Invalid OBJECT_STORAGE_TENANT_BASE value: {tenant_base}")

    def generate_asset_name(self, tenant_id, asset_id, asset_type, content_type):
        tenant_base = current_app.config.get('OBJECT_STORAGE_TENANT_BASE', 'bucket')
        if tenant_base == 'bucket':
            return f"assets/{asset_type}/{asset_id}.{content_type}"
        elif tenant_base == 'folder':
            return f"tenant-{tenant_id}/assets/{asset_type}/{asset_id}.{content_type}"
        else:
            raise ValueError(f"Invalid OBJECT_STORAGE_TENANT_BASE value: {tenant_base}")

    def upload_document_file(self, tenant_id, document_id, language, version_id, filename, file_data):
        bucket_name = self.generate_bucket_name(tenant_id)
        object_name = self.generate_object_name(tenant_id, document_id, language, version_id, filename)

        try:
            if isinstance(file_data, FileStorage):
                file_data = file_data.read()
            elif isinstance(file_data, io.BytesIO):
                file_data = file_data.getvalue()
            elif isinstance(file_data, str):
                file_data = file_data.encode('utf-8')
            elif not isinstance(file_data, bytes):
                raise TypeError('Unsupported file type. Expected FileStorage, BytesIO, str, or bytes.')

            self.client.put_object(
                bucket_name, object_name, io.BytesIO(file_data), len(file_data)
            )
            return bucket_name, object_name, len(file_data)
        except S3Error as err:
            raise Exception(f"Error occurred while uploading file: {err}")

    def upload_asset_file(self, tenant_id: int, asset_id: int, asset_type: str, file_type: str,
                          file_data: bytes | FileStorage | io.BytesIO | str, ) -> tuple[str, str, int]:
        bucket_name = self.generate_bucket_name(tenant_id)
        object_name = self.generate_asset_name(tenant_id, asset_id, asset_type, file_type)

        try:
            if isinstance(file_data, FileStorage):
                file_data = file_data.read()
            elif isinstance(file_data, io.BytesIO):
                file_data = file_data.getvalue()
            elif isinstance(file_data, str):
                file_data = file_data.encode('utf-8')
            elif not isinstance(file_data, bytes):
                raise TypeError('Unsupported file type. Expected FileStorage, BytesIO, str, or bytes.')

            self.client.put_object(
                bucket_name, object_name, io.BytesIO(file_data), len(file_data)
            )
            return bucket_name, object_name, len(file_data)
        except S3Error as err:
            raise Exception(f"Error occurred while uploading asset: {err}")

    def download_document_file(self, tenant_id, bucket_name, object_name):
        try:
            response = self.client.get_object(bucket_name, object_name)
            return response.read()
        except S3Error as err:
            raise Exception(f"Error occurred while downloading file: {err}")

    def download_asset_file(self, tenant_id, bucket_name, object_name):
        try:
            response = self.client.get_object(bucket_name, object_name)
            return response.read()
        except S3Error as err:
            raise Exception(f"Error occurred while downloading asset: {err}")

    def list_document_files(self, tenant_id, document_id, language=None, version_id=None):
        bucket_name = self.generate_bucket_name(tenant_id)
        prefix = f"{document_id}/"
        if language:
            prefix += f"{language}/"
            if version_id:
                prefix += f"{version_id}/"
        try:
            objects = self.client.list_objects(bucket_name, prefix=prefix, recursive=True)
            return [obj.object_name for obj in objects]
        except S3Error as err:
            raise Exception(f"Error occurred while listing files: {err}")

    def delete_document_file(self, tenant_id, document_id, language, version_id, filename):
        bucket_name = self.generate_bucket_name(tenant_id)
        object_name = self.generate_object_name(tenant_id, document_id, language, version_id, filename)
        try:
            self.client.remove_object(bucket_name, object_name)
            return True
        except S3Error as err:
            raise Exception(f"Error occurred while deleting file: {err}")

    def delete_object(self, bucket_name, object_name):
        try:
            self.client.remove_object(bucket_name, object_name)
        except S3Error as err:
            raise Exception(f"Error occurred while deleting object: {err}")

    def get_bucket_size(self, tenant_id: int) -> int:
        bucket_name = self.generate_bucket_name(tenant_id)
        total_size = 0
        for obj in self.client.list_objects(bucket_name, recursive=True):
            total_size += obj.size
        return total_size