"""compat API — /api/saju/compat/* 5 endpoints."""
from fastapi import APIRouter, HTTPException
from typing import Optional

from ..models import (
    CompatInterpretRequest,
    CompatInterpretResponse,
    CompatPatchRequest,
)
from ..interpret import pipeline
from ..calculator.core import calculate_saju
from ..calculator.analysis import perform_full_analysis
from ..calculator.compatibility import calculate_compatibility
from ..calculator.lunar import lunar_to_solar
from .. import db as db_module


router = APIRouter(prefix="/api/saju/compat")


def _calc_one(p) -> tuple[dict, dict]:
    """한 사람의 입력 → (saju, analysis)."""
    if p.calendar_type == "lunar":
        sy, sm, sd = lunar_to_solar(p.year, p.month, p.day, p.is_leap_month)
    else:
        sy, sm, sd = p.year, p.month, p.day
    saju = calculate_saju(sy, sm, sd, p.hour, p.gender)
    analysis = perform_full_analysis(saju, 2026)
    return saju, analysis


@router.post("/interpret", response_model=CompatInterpretResponse)
async def interpret_compat_endpoint(req: CompatInterpretRequest):
    try:
        saju_a, analysis_a = _calc_one(req.person_a)
        saju_b, analysis_b = _calc_one(req.person_b)
        compat = calculate_compatibility(saju_a, saju_b)
    except Exception as e:
        raise HTTPException(status_code=400, detail=f"계산 실패: {e}")

    try:
        interp_result = await pipeline.interpret_compat(
            saju_a, saju_b, analysis_a, analysis_b,
            compat["score"], compat["breakdown"],
        )
    except pipeline.SajuError as e:
        raise HTTPException(status_code=500, detail=str(e)) from e

    rid = db_module.save_compat_record({
        "person_a": req.person_a.model_dump(),
        "person_b": req.person_b.model_dump(),
        "saju_a": saju_a, "saju_b": saju_b,
        "score": compat["score"],
        "breakdown": compat["breakdown"],
        "interpretation_json": interp_result["interpretation_json"],
        "model": interp_result["model"],
        "tokens_in": interp_result["tokens_in"],
        "tokens_out": interp_result["tokens_out"],
        "cost_usd": interp_result["cost_usd"],
        "latency_ms": interp_result["latency_ms"],
        "reroll_count": interp_result["reroll_count"],
    })

    return {
        "saju_a": saju_a, "saju_b": saju_b,
        "score": compat["score"],
        "breakdown": compat["breakdown"],
        "interpretation_json": interp_result["interpretation_json"],
        "reading_id": rid,
        "model": interp_result["model"],
        "tokens_in": interp_result["tokens_in"],
        "tokens_out": interp_result["tokens_out"],
        "cost_usd": interp_result["cost_usd"],
        "latency_ms": interp_result["latency_ms"],
        "reroll_count": interp_result["reroll_count"],
    }


@router.get("/readings")
async def list_readings(page: int = 1, size: int = 20, favorite: Optional[bool] = None):
    return db_module.list_compat_records(page=page, size=size, favorite=favorite)


@router.get("/readings/{reading_id}")
async def get_reading(reading_id: int):
    row = db_module.get_compat_record(reading_id)
    if not row:
        raise HTTPException(status_code=404, detail="reading not found")
    return row


@router.patch("/readings/{reading_id}")
async def patch_reading(reading_id: int, req: CompatPatchRequest):
    row = db_module.get_compat_record(reading_id)
    if not row:
        raise HTTPException(status_code=404, detail="reading not found")
    db_module.update_compat_record(reading_id, **req.model_dump(exclude_none=True))
    return {"ok": True}


@router.delete("/readings/{reading_id}")
async def delete_reading(reading_id: int):
    row = db_module.get_compat_record(reading_id)
    if not row:
        raise HTTPException(status_code=404, detail="reading not found")
    db_module.delete_compat_record(reading_id)
    return {"ok": True}