"""AI router - Kimi API integration endpoints (P3-M1)."""
from typing import List
from fastapi import APIRouter, HTTPException, Query
from sqlalchemy import func

from ..services.ai_client import get_kimi_client
from ..schemas.ai import (
    ChatRequest, ChatResponse, AIHealthResponse,
    AICallLogResponse, AIUsageSummary
)
from ..database import SessionLocal
from ..models.ai_call_log import AICallLog

router = APIRouter(prefix="/api/ai", tags=["AI"])


@router.get("/health", response_model=AIHealthResponse)
def ai_health_check():
    """Check AI API key validity and list available models."""
    client = get_kimi_client()
    return client.health_check()


@router.post("/chat", response_model=ChatResponse)
def ai_chat(request: ChatRequest):
    """Send a chat completion request to Kimi API."""
    client = get_kimi_client()
    if not client.is_configured:
        raise HTTPException(status_code=503, detail="KIMI_API_KEY is not configured")
    try:
        result = client.chat(
            messages=[m.model_dump() for m in request.messages],
            model=request.model,
            temperature=request.temperature,
            max_tokens=request.max_tokens,
            system_prompt=request.system_prompt,
        )
        return ChatResponse(**result)
    except Exception as e:
        raise HTTPException(status_code=500, detail=str(e))


@router.get("/logs", response_model=List[AICallLogResponse])
def list_ai_logs(
    limit: int = Query(50, ge=1, le=200),
    offset: int = Query(0, ge=0),
    status: str = Query(None, description="success/failed"),
):
    """List AI call logs for cost tracking and debugging."""
    db = SessionLocal()
    query = db.query(AICallLog)
    if status:
        query = query.filter(AICallLog.status == status)
    logs = query.order_by(AICallLog.id.desc()).offset(offset).limit(limit).all()
    db.close()
    return [
        AICallLogResponse(
            id=log.id, endpoint=log.endpoint, model=log.model,
            status=log.status, duration_ms=log.duration_ms,
            prompt_tokens=log.prompt_tokens, completion_tokens=log.completion_tokens,
            total_tokens=log.total_tokens, error=log.error,
            created_at=log.created_at.isoformat() if log.created_at else "",
        )
        for log in logs
    ]


@router.get("/usage", response_model=AIUsageSummary)
def ai_usage_summary():
    """Get AI usage summary (total calls, tokens, duration)."""
    db = SessionLocal()
    total = db.query(func.count(AICallLog.id)).scalar() or 0
    success = db.query(func.count(AICallLog.id)).filter(AICallLog.status == "success").scalar() or 0
    failed = total - success
    total_tokens = db.query(func.coalesce(func.sum(AICallLog.total_tokens), 0)).scalar() or 0
    prompt_tokens = db.query(func.coalesce(func.sum(AICallLog.prompt_tokens), 0)).scalar() or 0
    completion_tokens = db.query(func.coalesce(func.sum(AICallLog.completion_tokens), 0)).scalar() or 0
    total_duration = db.query(func.coalesce(func.sum(AICallLog.duration_ms), 0)).scalar() or 0
    db.close()
    return AIUsageSummary(
        total_calls=total, success_calls=success, failed_calls=failed,
        total_tokens=total_tokens, total_prompt_tokens=prompt_tokens,
        total_completion_tokens=completion_tokens, total_duration_ms=total_duration,
    )