import asyncio
import json
import os
from abc import ABC, abstractmethod

import httpx
import requests

from src import config
from src.utils import get_docker_safe_url, hashstr, logger


class BaseEmbeddingModel(ABC):
    def __init__(self, model=None, name=None, dimension=None, url=None, base_url=None, api_key=None):
        """
        Args:
            model: 模型名称，冗余设计，同name
            name: 模型名称，冗余设计，同model
            dimension: 维度
            url: 请求URL，冗余设计，同base_url
            base_url: 基础URL，请求URL，冗余设计，同url
            api_key: 请求API密钥
        """
        base_url = base_url or url
        self.model = model or name
        self.dimension = dimension
        self.base_url = get_docker_safe_url(base_url)
        self.api_key = os.getenv(api_key, api_key)
        self.embed_state = {}

    @abstractmethod
    def encode(self, message: list[str] | str) -> list[list[float]]:
        """同步编码"""
        raise NotImplementedError("Subclasses must implement this method")

    def encode_queries(self, queries: list[str] | str) -> list[list[float]]:
        """等同于encode"""
        return self.encode(queries)

    @abstractmethod
    async def aencode(self, message: list[str] | str) -> list[list[float]]:
        """异步编码"""
        raise NotImplementedError("Subclasses must implement this method")

    async def aencode_queries(self, queries: list[str] | str) -> list[list[float]]:
        """等同于aencode"""
        return await self.aencode(queries)

    def batch_encode(self, messages: list[str], batch_size: int = 40) -> list[list[float]]:
        # logger.info(f"Batch encoding {len(messages)} messages")
        data = []
        task_id = None
        if len(messages) > batch_size:
            task_id = hashstr(messages)
            self.embed_state[task_id] = {"status": "in-progress", "total": len(messages), "progress": 0}

        for i in range(0, len(messages), batch_size):
            group_msg = messages[i : i + batch_size]
            logger.info(f"Encoding [{i}/{len(messages)}] messages (bsz={batch_size})")
            response = self.encode(group_msg)
            data.extend(response)
            if task_id:
                self.embed_state[task_id]["progress"] = i + len(group_msg)

        if task_id:
            self.embed_state[task_id]["status"] = "completed"

        return data

    async def abatch_encode(self, messages: list[str], batch_size: int = 40) -> list[list[float]]:
        data = []
        task_id = None
        if len(messages) > batch_size:
            task_id = hashstr(messages)
            self.embed_state[task_id] = {"status": "in-progress", "total": len(messages), "progress": 0}

        tasks = []
        for i in range(0, len(messages), batch_size):
            group_msg = messages[i : i + batch_size]
            tasks.append(self.aencode(group_msg))

        results = await asyncio.gather(*tasks)
        for res in results:
            data.extend(res)

        if task_id:
            self.embed_state[task_id]["progress"] = len(messages)
            self.embed_state[task_id]["status"] = "completed"

        return data


class OllamaEmbedding(BaseEmbeddingModel):
    """
    Ollama Embedding Model
    """

    def __init__(self, **kwargs) -> None:
        super().__init__(**kwargs)
        self.base_url = self.base_url or get_docker_safe_url("http://localhost:11434/api/embed")

    def encode(self, message: list[str] | str) -> list[list[float]]:
        if isinstance(message, str):
            message = [message]

        payload = {"model": self.model, "input": message}
        try:
            response = requests.post(self.base_url, json=payload, timeout=60)
            response.raise_for_status()
            result = response.json()
            if "embeddings" not in result:
                raise ValueError(f"Ollama Embedding failed: Invalid response format {result}")
            return result["embeddings"]
        except (requests.RequestException, json.JSONDecodeError) as e:
            logger.error(f"Ollama Embedding request failed: {e}, {payload}")
            raise ValueError(f"Ollama Embedding request failed: {e}")

    async def aencode(self, message: list[str] | str) -> list[list[float]]:
        if isinstance(message, str):
            message = [message]

        payload = {"model": self.model, "input": message}
        async with httpx.AsyncClient() as client:
            try:
                response = await client.post(self.base_url, json=payload, timeout=60)
                response.raise_for_status()
                result = response.json()
                if "embeddings" not in result:
                    raise ValueError(f"Ollama Embedding failed: Invalid response format {result}")
                return result["embeddings"]
            except (httpx.RequestError, json.JSONDecodeError) as e:
                logger.error(f"Ollama Embedding async request failed: {e}, {payload}")
                raise ValueError(f"Ollama Embedding async request failed: {e}")


class OtherEmbedding(BaseEmbeddingModel):
    def __init__(self, **kwargs) -> None:
        super().__init__(**kwargs)
        self.headers = {"Authorization": f"Bearer {self.api_key}", "Content-Type": "application/json"}

    def build_payload(self, message: list[str] | str) -> dict:
        return {"model": self.model, "input": message}

    def encode(self, message: list[str] | str) -> list[list[float]]:
        payload = self.build_payload(message)
        try:
            response = requests.post(self.base_url, json=payload, headers=self.headers, timeout=60)
            response.raise_for_status()
            result = response.json()
            if not isinstance(result, dict) or "data" not in result:
                raise ValueError(f"Other Embedding failed: Invalid response format {result}")
            return [item["embedding"] for item in result["data"]]
        except (requests.RequestException, json.JSONDecodeError) as e:
            logger.error(f"Other Embedding request failed: {e}, {payload}")
            raise ValueError(f"Other Embedding request failed: {e}")

    async def aencode(self, message: list[str] | str) -> list[list[float]]:
        payload = self.build_payload(message)
        async with httpx.AsyncClient() as client:
            try:
                response = await client.post(self.base_url, json=payload, headers=self.headers, timeout=60)
                response.raise_for_status()
                result = response.json()
                if not isinstance(result, dict) or "data" not in result:
                    raise ValueError(f"Other Embedding failed: Invalid response format {result}")
                return [item["embedding"] for item in result["data"]]
            except (httpx.RequestError, json.JSONDecodeError) as e:
                logger.error(f"Other Embedding async request failed: {e}, {payload}")
                raise ValueError(f"Other Embedding async request failed: {e}")

    async def test_connection(self) -> tuple[bool, str]:
        """
        测试embedding模型的连接性

        Returns:
            tuple: (success: bool, message: str)
        """
        try:
            # 使用简单的测试文本
            test_text = ["Hello world"]
            await self.aencode(test_text)
            return True, "连接正常"
        except Exception as e:
            error_msg = str(e)
            return False, error_msg


async def test_embedding_model_status(model_id: str) -> dict:
    """
    测试指定embedding模型的状态

    Args:
        model_id: 模型ID，格式为 "provider/model_name"

    Returns:
        dict: 包含状态信息的字典
    """
    try:
        support_embed_models = config.embed_model_names.keys()
        if model_id not in support_embed_models:
            return {"model_id": model_id, "status": "unsupported", "message": f"不支持的模型: {model_id}"}

        # 选择并创建模型实例
        model = select_embedding_model(model_id)

        # 测试连接
        success, message = await model.test_connection()

        return {
            "model_id": model_id,
            "status": "available" if success else "unavailable",
            "message": message if not success else "连接正常",
            "dimension": model.dimension,
        }

    except Exception as e:
        logger.warning(f"测试embedding模型状态失败 {model_id}: {e}")
        return {"model_id": model_id, "status": "error", "message": str(e)}


async def test_all_embedding_models_status() -> dict:
    """
    测试所有支持的embedding模型状态

    Returns:
        dict: 包含所有模型状态的字典
    """
    support_embed_models = list(config.embed_model_names.keys())
    results = {}

    # 并发测试所有模型
    tasks = [test_embedding_model_status(model_id) for model_id in support_embed_models]
    model_statuses = await asyncio.gather(*tasks, return_exceptions=True)

    for i, status in enumerate(model_statuses):
        if isinstance(status, Exception):
            model_id = support_embed_models[i]
            results[model_id] = {"model_id": model_id, "status": "error", "message": str(status)}
        else:
            results[status["model_id"]] = status

    return {
        "models": results,
        "total": len(support_embed_models),
        "available": len([m for m in results.values() if m["status"] == "available"]),
    }


def select_embedding_model(model_id):
    provider, model_name = model_id.split("/", 1) if model_id else ("", "")
    support_embed_models = config.embed_model_names.keys()
    assert model_id in support_embed_models, f"Unsupported embed model: {model_id}, only support {support_embed_models}"
    logger.info(f"Loading embedding model {model_id}")
    if provider == "local":
        raise ValueError("Local embedding model is not supported, please use other embedding models")

    elif provider == "ollama":
        model = OllamaEmbedding(**config.embed_model_names[model_id])

    else:
        model = OtherEmbedding(**config.embed_model_names[model_id])

    return model