"""
بارگذاری تنظیمات RAG از rag_config.yaml
"""
import os
from dataclasses import dataclass, field
from pathlib import Path
from typing import Any

import yaml


@dataclass
class EmbeddingConfig:
    provider: str
    model: str
    batch_size: int = 32
    api_key_env: str | None = None
    base_url: str | None = None


@dataclass
class QdrantConfig:
    host: str = "localhost"
    port: int = 6333
    collection_name: str = "croplogic_kb"
    vector_size: int = 384


@dataclass
class ChunkingConfig:
    max_chunk_tokens: int = 500
    overlap_tokens: int = 50


@dataclass
class LLMConfig:
    model: str = "gpt-4o"
    base_url: str | None = None
    api_key_env: str | None = None


@dataclass
class RAGConfig:
    embedding: EmbeddingConfig
    qdrant: QdrantConfig
    chunking: ChunkingConfig
    llm: LLMConfig = field(default_factory=LLMConfig)
    tone_file: str = "config/tone.txt"
    knowledge_base_path: str = "config/knowledge_base"
    chromadb: dict[str, Any] = field(default_factory=dict)


def load_rag_config(config_path: str | Path | None = None) -> RAGConfig:
    """
    بارگذاری تنظیمات از YAML و env.
    QDRANT_HOST و QDRANT_PORT از متغیرهای محیطی override می‌شوند.
    """
    if config_path is None:
        base = Path(__file__).resolve().parent.parent
        config_path = base / "config" / "rag_config.yaml"

    path = Path(config_path)
    if not path.exists():
        raise FileNotFoundError(f"RAG config not found: {path}")

    with open(path, encoding="utf-8") as f:
        data = yaml.safe_load(f) or {}

    emb = data.get("embedding", {})
    embedding = EmbeddingConfig(
        provider=emb.get("provider", "sentence_transformers"),
        model=emb.get("model", "text-embedding-3-small"),
        batch_size=emb.get("batch_size", 32),
        api_key_env=emb.get("api_key_env"),
        base_url=emb.get("base_url"),
    )

    qd = data.get("qdrant", {})
    qdrant = QdrantConfig(
        host=os.environ.get("QDRANT_HOST", qd.get("host", "localhost")),
        port=int(os.environ.get("QDRANT_PORT", qd.get("port", 6333))),
        collection_name=qd.get("collection_name", "croplogic_kb"),
        vector_size=qd.get("vector_size", 1536),
    )

    ch = data.get("chunking", {})
    chunking = ChunkingConfig(
        max_chunk_tokens=ch.get("max_chunk_tokens", 500),
        overlap_tokens=ch.get("overlap_tokens", 50),
    )

    llm_data = data.get("llm", {})
    llm = LLMConfig(
        model=llm_data.get("model", "gpt-4o"),
        base_url=llm_data.get("base_url"),
        api_key_env=llm_data.get("api_key_env"),
    )

    return RAGConfig(
        embedding=embedding,
        qdrant=qdrant,
        chunking=chunking,
        llm=llm,
        tone_file=data.get("tone_file", "config/tone.txt"),
        knowledge_base_path=data.get("knowledge_base_path", "config/knowledge_base"),
        chromadb=data.get("chromadb", {}),
    )