import ast
import concurrent.futures
import json
import logging
import os
from typing import Any, Optional, Union

import requests
import yaml
from tqdm import tqdm

from embedchain.cache import (Config, ExactMatchEvaluation,
                              SearchDistanceEvaluation, cache,
                              gptcache_data_manager, gptcache_pre_function)
from embedchain.client import Client
from embedchain.config import AppConfig, CacheConfig, ChunkerConfig
from embedchain.core.db.database import get_session, init_db, setup_engine
from embedchain.core.db.models import DataSource
from embedchain.embedchain import EmbedChain
from embedchain.embedder.base import BaseEmbedder
from embedchain.embedder.openai import OpenAIEmbedder
from embedchain.evaluation.base import BaseMetric
from embedchain.evaluation.metrics import (AnswerRelevance, ContextRelevance,
                                           Groundedness)
from embedchain.factory import EmbedderFactory, LlmFactory, VectorDBFactory
from embedchain.helpers.json_serializable import register_deserializable
from embedchain.llm.base import BaseLlm
from embedchain.llm.openai import OpenAILlm
from embedchain.telemetry.posthog import AnonymousTelemetry
from embedchain.utils.evaluation import EvalData, EvalMetric
from embedchain.utils.misc import validate_config
from embedchain.vectordb.base import BaseVectorDB
from embedchain.vectordb.chroma import ChromaDB

logger = logging.getLogger(__name__)


@register_deserializable
class App(EmbedChain):
    """
    EmbedChain App lets you create a LLM powered app for your unstructured
    data by defining your chosen data source, embedding model,
    and vector database.
    """

    def __init__(
        self,
        id: str = None,
        name: str = None,
        config: AppConfig = None,
        db: BaseVectorDB = None,
        embedding_model: BaseEmbedder = None,
        llm: BaseLlm = None,
        config_data: dict = None,
        auto_deploy: bool = False,
        chunker: ChunkerConfig = None,
        cache_config: CacheConfig = None,
        log_level: int = logging.WARN,
    ):
        """
        Initialize a new `App` instance.

        :param config: Configuration for the pipeline, defaults to None
        :type config: AppConfig, optional
        :param db: The database to use for storing and retrieving embeddings, defaults to None
        :type db: BaseVectorDB, optional
        :param embedding_model: The embedding model used to calculate embeddings, defaults to None
        :type embedding_model: BaseEmbedder, optional
        :param llm: The LLM model used to calculate embeddings, defaults to None
        :type llm: BaseLlm, optional
        :param config_data: Config dictionary, defaults to None
        :type config_data: dict, optional
        :param auto_deploy: Whether to deploy the pipeline automatically, defaults to False
        :type auto_deploy: bool, optional
        :raises Exception: If an error occurs while creating the pipeline
        """
        if id and config_data:
            raise Exception("Cannot provide both id and config. Please provide only one of them.")

        if id and name:
            raise Exception("Cannot provide both id and name. Please provide only one of them.")

        if name and config:
            raise Exception("Cannot provide both name and config. Please provide only one of them.")

        # Initialize the metadata db for the app
        setup_engine(database_uri=os.environ.get("EMBEDCHAIN_DB_URI"))
        init_db()

        self.auto_deploy = auto_deploy
        # Store the dict config as an attribute to be able to send it
        self.config_data = config_data if (config_data and validate_config(config_data)) else None
        self.client = None
        # pipeline_id from the backend
        self.id = None
        self.chunker = ChunkerConfig(**chunker) if chunker else None
        self.cache_config = cache_config

        self.config = config or AppConfig()
        self.name = self.config.name
        self.config.id = self.local_id = "default-app-id" if self.config.id is None else self.config.id

        if id is not None:
            # Init client first since user is trying to fetch the pipeline
            # details from the platform
            self._init_client()
            pipeline_details = self._get_pipeline(id)
            self.config.id = self.local_id = pipeline_details["metadata"]["local_id"]
            self.id = id

        if name is not None:
            self.name = name

        self.embedding_model = embedding_model or OpenAIEmbedder()
        self.db = db or ChromaDB()
        self.llm = llm or OpenAILlm()
        self._init_db()

        # Session for the metadata db
        self.db_session = get_session()

        # If cache_config is provided, initializing the cache ...
        if self.cache_config is not None:
            self._init_cache()

        # Send anonymous telemetry
        self._telemetry_props = {"class": self.__class__.__name__}
        self.telemetry = AnonymousTelemetry(enabled=self.config.collect_metrics)
        self.telemetry.capture(event_name="init", properties=self._telemetry_props)

        self.user_asks = []
        if self.auto_deploy:
            self.deploy()

    def _init_db(self):
        """
        Initialize the database.
        """
        self.db._set_embedder(self.embedding_model)
        self.db._initialize()
        self.db.set_collection_name(self.db.config.collection_name)

    def _init_cache(self):
        if self.cache_config.similarity_eval_config.strategy == "exact":
            similarity_eval_func = ExactMatchEvaluation()
        else:
            similarity_eval_func = SearchDistanceEvaluation(
                max_distance=self.cache_config.similarity_eval_config.max_distance,
                positive=self.cache_config.similarity_eval_config.positive,
            )

        cache.init(
            pre_embedding_func=gptcache_pre_function,
            embedding_func=self.embedding_model.to_embeddings,
            data_manager=gptcache_data_manager(vector_dimension=self.embedding_model.vector_dimension),
            similarity_evaluation=similarity_eval_func,
            config=Config(**self.cache_config.init_config.as_dict()),
        )

    def _init_client(self):
        """
        Initialize the client.
        """
        config = Client.load_config()
        if config.get("api_key"):
            self.client = Client()
        else:
            api_key = input(
                "🔑 Enter your Embedchain API key. You can find the API key at https://app.embedchain.ai/settings/keys/ \n"  # noqa: E501
            )
            self.client = Client(api_key=api_key)

    def _get_pipeline(self, id):
        """
        Get existing pipeline
        """
        print("🛠️ Fetching pipeline details from the platform...")
        url = f"{self.client.host}/api/v1/pipelines/{id}/cli/"
        r = requests.get(
            url,
            headers={"Authorization": f"Token {self.client.api_key}"},
        )
        if r.status_code == 404:
            raise Exception(f"❌ Pipeline with id {id} not found!")

        print(
            f"🎉 Pipeline loaded successfully! Pipeline url: https://app.embedchain.ai/pipelines/{r.json()['id']}\n"  # noqa: E501
        )
        return r.json()

    def _create_pipeline(self):
        """
        Create a pipeline on the platform.
        """
        print("🛠️ Creating pipeline on the platform...")
        # self.config_data is a dict. Pass it inside the key 'yaml_config' to the backend
        payload = {
            "yaml_config": json.dumps(self.config_data),
            "name": self.name,
            "local_id": self.local_id,
        }
        url = f"{self.client.host}/api/v1/pipelines/cli/create/"
        r = requests.post(
            url,
            json=payload,
            headers={"Authorization": f"Token {self.client.api_key}"},
        )
        if r.status_code not in [200, 201]:
            raise Exception(f"❌ Error occurred while creating pipeline. API response: {r.text}")

        if r.status_code == 200:
            print(
                f"🎉🎉🎉 Existing pipeline found! View your pipeline: https://app.embedchain.ai/pipelines/{r.json()['id']}\n"  # noqa: E501
            )  # noqa: E501
        elif r.status_code == 201:
            print(
                f"🎉🎉🎉 Pipeline created successfully! View your pipeline: https://app.embedchain.ai/pipelines/{r.json()['id']}\n"  # noqa: E501
            )
        return r.json()

    def _get_presigned_url(self, data_type, data_value):
        payload = {"data_type": data_type, "data_value": data_value}
        r = requests.post(
            f"{self.client.host}/api/v1/pipelines/{self.id}/cli/presigned_url/",
            json=payload,
            headers={"Authorization": f"Token {self.client.api_key}"},
        )
        r.raise_for_status()
        return r.json()

    def _upload_file_to_presigned_url(self, presigned_url, file_path):
        try:
            with open(file_path, "rb") as file:
                response = requests.put(presigned_url, data=file)
                response.raise_for_status()
                return response.status_code == 200
        except Exception as e:
            logger.exception(f"Error occurred during file upload: {str(e)}")
            print("❌ Error occurred during file upload!")
            return False

    def _upload_data_to_pipeline(self, data_type, data_value, metadata=None):
        payload = {
            "data_type": data_type,
            "data_value": data_value,
            "metadata": metadata,
        }
        try:
            self._send_api_request(f"/api/v1/pipelines/{self.id}/cli/add/", payload)
            # print the local file path if user tries to upload a local file
            printed_value = metadata.get("file_path") if metadata.get("file_path") else data_value
            print(f"✅ Data of type: {data_type}, value: {printed_value} added successfully.")
        except Exception as e:
            print(f"❌ Error occurred during data upload for type {data_type}!. Error: {str(e)}")

    def _send_api_request(self, endpoint, payload):
        url = f"{self.client.host}{endpoint}"
        headers = {"Authorization": f"Token {self.client.api_key}"}
        response = requests.post(url, json=payload, headers=headers)
        response.raise_for_status()
        return response

    def _process_and_upload_data(self, data_hash, data_type, data_value):
        if os.path.isabs(data_value):
            presigned_url_data = self._get_presigned_url(data_type, data_value)
            presigned_url = presigned_url_data["presigned_url"]
            s3_key = presigned_url_data["s3_key"]
            if self._upload_file_to_presigned_url(presigned_url, file_path=data_value):
                metadata = {"file_path": data_value, "s3_key": s3_key}
                data_value = presigned_url
            else:
                logger.error(f"File upload failed for hash: {data_hash}")
                return False
        else:
            if data_type == "qna_pair":
                data_value = list(ast.literal_eval(data_value))
            metadata = {}

        try:
            self._upload_data_to_pipeline(data_type, data_value, metadata)
            self._mark_data_as_uploaded(data_hash)
            return True
        except Exception:
            print(f"❌ Error occurred during data upload for hash {data_hash}!")
            return False

    def _mark_data_as_uploaded(self, data_hash):
        self.db_session.query(DataSource).filter_by(hash=data_hash, app_id=self.local_id).update({"is_uploaded": 1})

    def get_data_sources(self):
        data_sources = self.db_session.query(DataSource).filter_by(app_id=self.local_id).all()
        results = []
        for row in data_sources:
            results.append({"data_type": row.type, "data_value": row.value, "metadata": row.meta_data})
        return results

    def deploy(self):
        if self.client is None:
            self._init_client()

        pipeline_data = self._create_pipeline()
        self.id = pipeline_data["id"]

        results = self.db_session.query(DataSource).filter_by(app_id=self.local_id, is_uploaded=0).all()
        if len(results) > 0:
            print("🛠️ Adding data to your pipeline...")
        for result in results:
            data_hash, data_type, data_value = result.hash, result.data_type, result.data_value
            self._process_and_upload_data(data_hash, data_type, data_value)

        # Send anonymous telemetry
        self.telemetry.capture(event_name="deploy", properties=self._telemetry_props)

    @classmethod
    def from_config(
        cls,
        config_path: Optional[str] = None,
        config: Optional[dict[str, Any]] = None,
        auto_deploy: bool = False,
        yaml_path: Optional[str] = None,
    ):
        """
        Instantiate a App object from a configuration.

        :param config_path: Path to the YAML or JSON configuration file.
        :type config_path: Optional[str]
        :param config: A dictionary containing the configuration.
        :type config: Optional[dict[str, Any]]
        :param auto_deploy: Whether to deploy the app automatically, defaults to False
        :type auto_deploy: bool, optional
        :param yaml_path: (Deprecated) Path to the YAML configuration file. Use config_path instead.
        :type yaml_path: Optional[str]
        :return: An instance of the App class.
        :rtype: App
        """
        # Backward compatibility for yaml_path
        if yaml_path and not config_path:
            config_path = yaml_path

        if config_path and config:
            raise ValueError("Please provide only one of config_path or config.")

        config_data = None

        if config_path:
            file_extension = os.path.splitext(config_path)[1]
            with open(config_path, "r", encoding="UTF-8") as file:
                if file_extension in [".yaml", ".yml"]:
                    config_data = yaml.safe_load(file)
                elif file_extension == ".json":
                    config_data = json.load(file)
                else:
                    raise ValueError("config_path must be a path to a YAML or JSON file.")
        elif config and isinstance(config, dict):
            config_data = config
        else:
            logger.error(
                "Please provide either a config file path (YAML or JSON) or a config dictionary. Falling back to defaults because no config is provided.",  # noqa: E501
            )
            config_data = {}

        # Validate the config
        validate_config(config_data)

        app_config_data = config_data.get("app", {}).get("config", {})
        vector_db_config_data = config_data.get("vectordb", {})
        embedding_model_config_data = config_data.get("embedding_model", config_data.get("embedder", {}))
        llm_config_data = config_data.get("llm", {})
        chunker_config_data = config_data.get("chunker", {})
        cache_config_data = config_data.get("cache", None)

        app_config = AppConfig(**app_config_data)

        vector_db_provider = vector_db_config_data.get("provider", "chroma")
        vector_db = VectorDBFactory.create(vector_db_provider, vector_db_config_data.get("config", {}))

        if llm_config_data:
            # Initialize the metadata db for the app here since llmfactory needs it for initialization of
            # the llm memory
            setup_engine(database_uri=os.environ.get("EMBEDCHAIN_DB_URI"))
            init_db()
            llm_provider = llm_config_data.get("provider", "openai")
            llm = LlmFactory.create(llm_provider, llm_config_data.get("config", {}))
        else:
            llm = None

        embedding_model_provider = embedding_model_config_data.get("provider", "openai")
        embedding_model = EmbedderFactory.create(
            embedding_model_provider, embedding_model_config_data.get("config", {})
        )

        if cache_config_data is not None:
            cache_config = CacheConfig.from_config(cache_config_data)
        else:
            cache_config = None

        return cls(
            config=app_config,
            llm=llm,
            db=vector_db,
            embedding_model=embedding_model,
            config_data=config_data,
            auto_deploy=auto_deploy,
            chunker=chunker_config_data,
            cache_config=cache_config,
        )

    def _eval(self, dataset: list[EvalData], metric: Union[BaseMetric, str]):
        """
        Evaluate the app on a dataset for a given metric.
        """
        metric_str = metric.name if isinstance(metric, BaseMetric) else metric
        eval_class_map = {
            EvalMetric.CONTEXT_RELEVANCY.value: ContextRelevance,
            EvalMetric.ANSWER_RELEVANCY.value: AnswerRelevance,
            EvalMetric.GROUNDEDNESS.value: Groundedness,
        }

        if metric_str in eval_class_map:
            return eval_class_map[metric_str]().evaluate(dataset)

        # Handle the case for custom metrics
        if isinstance(metric, BaseMetric):
            return metric.evaluate(dataset)
        else:
            raise ValueError(f"Invalid metric: {metric}")

    def evaluate(
        self,
        questions: Union[str, list[str]],
        metrics: Optional[list[Union[BaseMetric, str]]] = None,
        num_workers: int = 4,
    ):
        """
        Evaluate the app on a question.

        param: questions: A question or a list of questions to evaluate.
        type: questions: Union[str, list[str]]
        param: metrics: A list of metrics to evaluate. Defaults to all metrics.
        type: metrics: Optional[list[Union[BaseMetric, str]]]
        param: num_workers: Number of workers to use for parallel processing.
        type: num_workers: int
        return: A dictionary containing the evaluation results.
        rtype: dict
        """
        if "OPENAI_API_KEY" not in os.environ:
            raise ValueError("Please set the OPENAI_API_KEY environment variable with permission to use `gpt4` model.")

        queries, answers, contexts = [], [], []
        if isinstance(questions, list):
            with concurrent.futures.ThreadPoolExecutor(max_workers=num_workers) as executor:
                future_to_data = {executor.submit(self.query, q, citations=True): q for q in questions}
                for future in tqdm(
                    concurrent.futures.as_completed(future_to_data),
                    total=len(future_to_data),
                    desc="Getting answer and contexts for questions",
                ):
                    question = future_to_data[future]
                    queries.append(question)
                    answer, context = future.result()
                    answers.append(answer)
                    contexts.append(list(map(lambda x: x[0], context)))
        else:
            answer, context = self.query(questions, citations=True)
            queries = [questions]
            answers = [answer]
            contexts = [list(map(lambda x: x[0], context))]

        metrics = metrics or [
            EvalMetric.CONTEXT_RELEVANCY.value,
            EvalMetric.ANSWER_RELEVANCY.value,
            EvalMetric.GROUNDEDNESS.value,
        ]

        logger.info(f"Collecting data from {len(queries)} questions for evaluation...")
        dataset = []
        for q, a, c in zip(queries, answers, contexts):
            dataset.append(EvalData(question=q, answer=a, contexts=c))

        logger.info(f"Evaluating {len(dataset)} data points...")
        result = {}
        with concurrent.futures.ThreadPoolExecutor(max_workers=num_workers) as executor:
            future_to_metric = {executor.submit(self._eval, dataset, metric): metric for metric in metrics}
            for future in tqdm(
                concurrent.futures.as_completed(future_to_metric),
                total=len(future_to_metric),
                desc="Evaluating metrics",
            ):
                metric = future_to_metric[future]
                if isinstance(metric, BaseMetric):
                    result[metric.name] = future.result()
                else:
                    result[metric] = future.result()

        if self.config.collect_metrics:
            telemetry_props = self._telemetry_props
            metrics_names = []
            for metric in metrics:
                if isinstance(metric, BaseMetric):
                    metrics_names.append(metric.name)
                else:
                    metrics_names.append(metric)
            telemetry_props["metrics"] = metrics_names
            self.telemetry.capture(event_name="evaluate", properties=telemetry_props)

        return result