"""FastAPI entrypoint for insta-lab."""

import asyncio
import json
import logging
import os
from typing import Optional

from fastapi import FastAPI, HTTPException, BackgroundTasks, Body, Query
from fastapi.middleware.cors import CORSMiddleware
from fastapi.responses import FileResponse
from pydantic import BaseModel

from .config import (
    CORS_ALLOW_ORIGINS, NAVER_CLIENT_ID, ANTHROPIC_API_KEY,
    INSTA_DATA_PATH, DB_PATH, DEFAULT_CATEGORY_SEEDS, KEYWORDS_PER_CATEGORY,
    INSTA_DEFAULT_THEME,
)
from . import db, news_collector, keyword_extractor, card_writer, card_renderer, trend_collector

logger = logging.getLogger(__name__)
app = FastAPI()

app.add_middleware(
    CORSMiddleware,
    allow_origins=[o.strip() for o in CORS_ALLOW_ORIGINS.split(",")],
    allow_credentials=False,
    allow_methods=["GET", "POST", "PUT", "DELETE", "OPTIONS", "PATCH"],
    allow_headers=["Content-Type"],
)


@app.on_event("startup")
def on_startup():
    os.makedirs(INSTA_DATA_PATH, exist_ok=True)
    db.init_db()


@app.get("/health")
def health():
    return {"ok": True}


@app.get("/api/insta/status")
def status():
    return {
        "ok": True,
        "naver_api": bool(NAVER_CLIENT_ID),
        "anthropic_api": bool(ANTHROPIC_API_KEY),
    }


# ── News ─────────────────────────────────────────────────────────
class CollectRequest(BaseModel):
    categories: Optional[list[str]] = None


def _seeds_for(category: str) -> list[str]:
    pt = db.get_prompt_template("category_seeds")
    if pt and pt.get("template"):
        try:
            data = json.loads(pt["template"])
            if category in data:
                return list(data[category])
        except Exception:
            pass
    return list(DEFAULT_CATEGORY_SEEDS.get(category, []))


async def _bg_collect(task_id: str, categories: list[str]):
    try:
        db.update_task(task_id, "processing", 10, "수집 중")
        total = 0
        for cat in categories:
            seeds = _seeds_for(cat)
            if not seeds:
                continue
            total += news_collector.collect_for_category(cat, seeds)
        db.update_task(task_id, "succeeded", 100, f"{total}건 수집", result_id=total)
    except Exception as e:
        logger.exception("collect failed")
        db.update_task(task_id, "failed", 0, "", error=str(e))


@app.post("/api/insta/news/collect")
def collect_news(req: CollectRequest, bg: BackgroundTasks):
    cats = req.categories or list(DEFAULT_CATEGORY_SEEDS.keys())
    tid = db.create_task("news_collect", {"categories": cats})
    bg.add_task(_bg_collect, tid, cats)
    return {"task_id": tid, "categories": cats}


@app.get("/api/insta/news/articles")
def list_articles(category: Optional[str] = None, days: int = Query(7, ge=1, le=90)):
    return {"items": db.list_news_articles(category=category, days=days)}


# ── Keywords ─────────────────────────────────────────────────────
class ExtractRequest(BaseModel):
    categories: Optional[list[str]] = None


async def _bg_extract(task_id: str, categories: Optional[list[str]] = None):
    try:
        db.update_task(task_id, "processing", 10, "추출 중")
        prefs_rows = db.get_preferences()
        weights = {p["category"]: p["weight"] for p in prefs_rows}
        if categories:
            # 사용자가 카테고리 명시한 경우만 그 서브셋으로 균등 가중치 (override)
            weights = {c: 1.0 for c in categories}
        total = KEYWORDS_PER_CATEGORY * max(1, len([w for w in weights.values() if w > 0]))
        keyword_extractor.extract_with_weights(weights, total_limit=total)
        db.update_task(task_id, "succeeded", 100, "완료", result_id=0)
    except Exception as e:
        logger.exception("extract failed")
        db.update_task(task_id, "failed", 0, "", error=str(e))


@app.post("/api/insta/keywords/extract")
def extract_keywords(req: ExtractRequest, bg: BackgroundTasks):
    cats = req.categories or list(DEFAULT_CATEGORY_SEEDS.keys())
    tid = db.create_task("keyword_extract", {"categories": cats})
    bg.add_task(_bg_extract, tid, cats)
    return {"task_id": tid, "categories": cats}


@app.get("/api/insta/keywords")
def list_keywords(
    category: Optional[str] = None,
    used: Optional[bool] = None,
    source: Optional[str] = None,
):
    if source:
        return {"items": db.list_trends(source=source, category=category, days=30)}
    return {"items": db.list_trending_keywords(category=category, used=used)}


# ── Slates ───────────────────────────────────────────────────────
class SlateRequest(BaseModel):
    keyword: str
    category: str
    keyword_id: Optional[int] = None


async def _bg_create_slate(task_id: str, keyword: str, category: str, keyword_id: Optional[int]):
    try:
        db.update_task(task_id, "processing", 30, "카피 생성 중")
        sid = card_writer.write_slate(keyword=keyword, category=category)
        db.update_task(task_id, "processing", 70, "카드 렌더 중")
        await card_renderer.render_slate(sid, template=f"{INSTA_DEFAULT_THEME}/card.html.j2")
        db.update_slate_status(sid, "rendered")
        if keyword_id:
            db.mark_keyword_used(keyword_id)
        db.update_task(task_id, "succeeded", 100, "완료", result_id=sid)
    except Exception as e:
        logger.exception("create slate failed")
        db.update_task(task_id, "failed", 0, "", error=str(e))


@app.post("/api/insta/slates")
def create_slate(req: SlateRequest, bg: BackgroundTasks):
    tid = db.create_task("slate_create", req.dict())
    bg.add_task(_bg_create_slate, tid, req.keyword, req.category, req.keyword_id)
    return {"task_id": tid}


@app.get("/api/insta/slates")
def list_slates(limit: int = Query(50, ge=1, le=500)):
    return {"items": db.list_card_slates(limit=limit)}


@app.get("/api/insta/slates/{slate_id}")
def get_slate(slate_id: int):
    s = db.get_card_slate(slate_id)
    if not s:
        raise HTTPException(404, "slate not found")
    s["assets"] = db.list_card_assets(slate_id)
    for k in ("cover_copy", "body_copies", "cta_copy", "hashtags"):
        if isinstance(s.get(k), str):
            try:
                s[k] = json.loads(s[k])
            except Exception:
                pass
    return s


async def _bg_render(task_id: str, slate_id: int):
    try:
        db.update_task(task_id, "processing", 30, "재렌더 중")
        await card_renderer.render_slate(slate_id, template=f"{INSTA_DEFAULT_THEME}/card.html.j2")
        db.update_slate_status(slate_id, "rendered")
        db.update_task(task_id, "succeeded", 100, "완료", result_id=slate_id)
    except Exception as e:
        logger.exception("render failed")
        db.update_task(task_id, "failed", 0, "", error=str(e))


@app.post("/api/insta/slates/{slate_id}/render")
def render_slate_endpoint(slate_id: int, bg: BackgroundTasks):
    if not db.get_card_slate(slate_id):
        raise HTTPException(404, "slate not found")
    tid = db.create_task("slate_render", {"slate_id": slate_id})
    bg.add_task(_bg_render, tid, slate_id)
    return {"task_id": tid}


@app.get("/api/insta/slates/{slate_id}/assets/{page}")
def get_asset(slate_id: int, page: int):
    if not (1 <= page <= 10):
        raise HTTPException(400, "page must be 1..10")
    assets = db.list_card_assets(slate_id)
    match = next((a for a in assets if a["page_index"] == page), None)
    if not match:
        raise HTTPException(404, "asset not found")
    return FileResponse(match["file_path"], media_type="image/png")


@app.delete("/api/insta/slates/{slate_id}")
def delete_slate(slate_id: int):
    if not db.get_card_slate(slate_id):
        raise HTTPException(404)
    for a in db.list_card_assets(slate_id):
        try:
            os.unlink(a["file_path"])
        except OSError:
            pass
    db.delete_card_slate(slate_id)
    return {"ok": True}


# ── Tasks ────────────────────────────────────────────────────────
@app.get("/api/insta/tasks/{task_id}")
def get_task_status(task_id: str):
    t = db.get_task(task_id)
    if not t:
        raise HTTPException(404)
    return t


# ── Prompt Templates ─────────────────────────────────────────────
class TemplateBody(BaseModel):
    template: str
    description: str = ""


@app.get("/api/insta/templates/prompts/{name}")
def get_prompt(name: str):
    pt = db.get_prompt_template(name)
    if not pt:
        raise HTTPException(404)
    return pt


@app.put("/api/insta/templates/prompts/{name}")
def upsert_prompt(name: str, body: TemplateBody):
    db.upsert_prompt_template(name, body.template, body.description)
    return db.get_prompt_template(name)


# ── Trends ───────────────────────────────────────────────────────
class TrendsCollectRequest(BaseModel):
    categories: Optional[list[str]] = None


async def _bg_collect_trends(task_id: str, categories: list[str]):
    try:
        db.update_task(task_id, "processing", 10, "외부 트렌드 수집 중")
        result = trend_collector.collect_all(categories)
        msg = f"naver:{result['naver_popular']}, youtube:{result['youtube_trending']}"
        db.update_task(task_id, "succeeded", 100, msg, result_id=sum(result.values()))
    except Exception as e:
        logger.exception("trends collect failed")
        db.update_task(task_id, "failed", 0, "", error=str(e))


@app.post("/api/insta/trends/collect")
def collect_trends(req: TrendsCollectRequest, bg: BackgroundTasks):
    cats = req.categories or list(DEFAULT_CATEGORY_SEEDS.keys())
    tid = db.create_task("trends_collect", {"categories": cats})
    bg.add_task(_bg_collect_trends, tid, cats)
    return {"task_id": tid, "categories": cats}


@app.get("/api/insta/trends")
def list_trends_endpoint(
    source: Optional[str] = None,
    category: Optional[str] = None,
    days: int = Query(1, ge=1, le=90),
):
    return {"items": db.list_trends(source=source, category=category, days=days)}


# ── Preferences ──────────────────────────────────────────────────
class PreferencesBody(BaseModel):
    categories: dict[str, float]


@app.get("/api/insta/preferences")
def get_preferences_endpoint():
    return {"categories": db.get_preferences()}


@app.put("/api/insta/preferences")
def put_preferences_endpoint(body: PreferencesBody):
    db.upsert_preferences(body.categories)
    return {"categories": db.get_preferences()}