import os, json, time, re, asyncio
from fastapi import APIRouter, Request
from fastapi.responses import JSONResponse
from shared import GROQ_API_KEY, GROQ_URL, _db_read, _db_read_one, _db_write, _db_write_sync, _sanitize_text, SA_DB_PATH

router = APIRouter()

# ═══ DB 초기화 (shared.py의 init_db에서 호출) ═══
MEMORY_TABLES_SQL = """
CREATE TABLE IF NOT EXISTS conversations (
    id INTEGER PRIMARY KEY AUTOINCREMENT,
    email TEXT NOT NULL,
    role TEXT NOT NULL,
    content TEXT NOT NULL,
    page_url TEXT DEFAULT '',
    page_title TEXT DEFAULT '',
    created_at REAL NOT NULL
);
CREATE INDEX IF NOT EXISTS idx_conv_email ON conversations(email, created_at DESC);

CREATE TABLE IF NOT EXISTS user_memory (
    id INTEGER PRIMARY KEY AUTOINCREMENT,
    email TEXT NOT NULL,
    category TEXT NOT NULL DEFAULT 'general',
    key TEXT NOT NULL,
    value TEXT NOT NULL,
    source TEXT DEFAULT '',
    importance INTEGER DEFAULT 5,
    created_at REAL NOT NULL,
    updated_at REAL NOT NULL
);
CREATE INDEX IF NOT EXISTS idx_mem_email ON user_memory(email, importance DESC);
CREATE UNIQUE INDEX IF NOT EXISTS idx_mem_unique ON user_memory(email, category, key);

CREATE TABLE IF NOT EXISTS task_history (
    id INTEGER PRIMARY KEY AUTOINCREMENT,
    email TEXT NOT NULL,
    task_type TEXT NOT NULL,
    task_input TEXT NOT NULL,
    task_output TEXT DEFAULT '',
    page_url TEXT DEFAULT '',
    page_title TEXT DEFAULT '',
    status TEXT DEFAULT 'completed',
    created_at REAL NOT NULL
);
CREATE INDEX IF NOT EXISTS idx_task_email ON task_history(email, created_at DESC);
"""

async def init_memory_tables():
    """메모리 테이블 초기화 — app.py startup에서 호출"""
    import aiosqlite
    async with aiosqlite.connect(SA_DB_PATH, timeout=10.0) as db:
        await db.executescript(MEMORY_TABLES_SQL)
        await db.commit()
    print("✅ Memory tables initialized")

# ═══ 대화 이력 저장/조회 ═══
async def save_conversation(email, role, content, page_url="", page_title=""):
    """대화 한 턴 저장"""
    content = _sanitize_text(content)[:10000]
    await _db_write(
        "INSERT INTO conversations (email,role,content,page_url,page_title,created_at) VALUES (?,?,?,?,?,?)",
        (email.lower(), role, content, page_url[:500], page_title[:200], time.time())
    )

async def get_recent_conversations(email, limit=10):
    """최근 대화 N턴 조회"""
    rows = await _db_read(
        "SELECT role, content, page_url, created_at FROM conversations WHERE email=? ORDER BY created_at DESC LIMIT ?",
        (email.lower(), limit)
    )
    result = [{"role": r["role"], "content": r["content"], "page_url": r["page_url"]} for r in reversed(rows)]
    return result

# ═══ 장기기억 저장/조회/검색 ═══
async def save_memory(email, category, key, value, source="", importance=5):
    """장기기억 저장 (upsert)"""
    now = time.time()
    await _db_write(
        """INSERT INTO user_memory (email,category,key,value,source,importance,created_at,updated_at)
        VALUES (?,?,?,?,?,?,?,?)
        ON CONFLICT(email,category,key) DO UPDATE SET value=excluded.value, source=excluded.source,
        importance=MAX(importance, excluded.importance), updated_at=excluded.updated_at""",
        (email.lower(), category, _sanitize_text(key)[:200], _sanitize_text(value)[:2000], source[:200], importance, now, now)
    )

async def get_all_memories(email, limit=50):
    """전체 장기기억 조회 (중요도+최신순)"""
    rows = await _db_read(
        "SELECT id, category, key, value, importance, updated_at FROM user_memory WHERE email=? ORDER BY importance DESC, updated_at DESC LIMIT ?",
        (email.lower(), limit)
    )
    return [dict(r) for r in rows]

async def search_memories(email, query, limit=10):
    """키워드 기반 기억 검색"""
    keywords = re.findall(r'[\w가-힣]+', query.lower())
    if not keywords:
        return []
    conditions = " OR ".join(["(LOWER(key) LIKE ? OR LOWER(value) LIKE ?)" for _ in keywords])
    params = []
    for kw in keywords:
        params.extend([f"%{kw}%", f"%{kw}%"])
    rows = await _db_read(
        f"SELECT id, category, key, value, importance FROM user_memory WHERE email=? AND ({conditions}) ORDER BY importance DESC LIMIT ?",
        [email.lower()] + params + [limit]
    )
    return [dict(r) for r in rows]

async def delete_memory(email, memory_id):
    """기억 삭제"""
    await _db_write_sync("DELETE FROM user_memory WHERE id=? AND email=?", (memory_id, email.lower()))

# ═══ 작업 이력 저장/조회 ═══
async def save_task(email, task_type, task_input, task_output="", page_url="", page_title="", status="completed"):
    """작업 이력 저장"""
    await _db_write(
        "INSERT INTO task_history (email,task_type,task_input,task_output,page_url,page_title,status,created_at) VALUES (?,?,?,?,?,?,?,?)",
        (email.lower(), task_type[:50], _sanitize_text(task_input)[:2000], _sanitize_text(task_output)[:2000],
         page_url[:500], page_title[:200], status, time.time())
    )

async def get_recent_tasks(email, limit=10):
    """최근 작업 이력"""
    rows = await _db_read(
        "SELECT task_type, task_input, task_output, page_url, status, created_at FROM task_history WHERE email=? ORDER BY created_at DESC LIMIT ?",
        (email.lower(), limit)
    )
    return [dict(r) for r in rows]

# ═══ LLM 기반 자동 기억 추출 (BackgroundTask) ═══
async def extract_memories_from_conversation(email, user_msg, assistant_msg, page_url=""):
    """대화에서 장기기억을 자동 추출 (백그라운드)"""
    if not GROQ_API_KEY or not user_msg:
        return
    prompt = f"""다음 대화에서 사용자에 대해 기억할 만한 핵심 정보를 추출하세요.
사용자 메시지: {user_msg[:1000]}
AI 응답: {(assistant_msg or '')[:500]}
페이지: {page_url[:200]}

JSON 배열로만 응답 (정보 없으면 빈 배열 []):
[
  {{"category": "personal|preference|work|skill|location|habit|request", "key": "간단한 키", "value": "값", "importance": 1~10}}
]
규칙:
- 명확한 사실만 추출 (추측 금지)
- 일반적인 질문(날씨, 검색 등)에서는 추출하지 않음
- category: personal(이름/나이), preference(선호), work(직업/회사), skill(기술), location(위치), habit(습관), request(반복요청)
- importance: 이름/직업=9, 선호=7, 일반=5
- 최대 3개까지"""

    try:
        import httpx
        async with httpx.AsyncClient(timeout=30.0) as client:
            resp = await client.post(
                GROQ_URL,
                headers={"Authorization": f"Bearer {GROQ_API_KEY}", "Content-Type": "application/json"},
                json={"model": "openai/gpt-oss-120b", "messages": [{"role": "user", "content": prompt}],
                      "max_completion_tokens": 500, "temperature": 0.1, "stream": False}
            )
            if resp.status_code != 200:
                return
            text = resp.json().get("choices", [{}])[0].get("message", {}).get("content", "")
            m = re.search(r'\[[\s\S]*\]', text)
            if not m:
                return
            items = json.loads(m.group())
            for item in items[:3]:
                cat = item.get("category", "general")
                key = item.get("key", "")
                value = item.get("value", "")
                imp = min(10, max(1, int(item.get("importance", 5))))
                if key and value:
                    await save_memory(email, cat, key, value, source=page_url[:200], importance=imp)
                    print(f"[memory] ✅ {email}: {cat}/{key}={value} (imp={imp})")
    except Exception as e:
        print(f"[memory] extract error: {e}")

# ═══ 컨텍스트 빌더: 기억 + 대화이력 + 작업이력 → 시스템 프롬프트 ═══
async def build_memory_context(email, current_message):
    """현재 질문에 맞는 기억 컨텍스트 구성"""
    parts = []

    # 1. 장기기억 (관련 기억 검색 + 중요 기억 상위)
    relevant = await search_memories(email, current_message, limit=5)
    top_memories = await get_all_memories(email, limit=10)

    # 중복 제거 후 합산
    seen_ids = set()
    all_mems = []
    for m in relevant + top_memories:
        if m["id"] not in seen_ids:
            seen_ids.add(m["id"])
            all_mems.append(m)
    all_mems = all_mems[:10]

    if all_mems:
        mem_lines = []
        for m in all_mems:
            mem_lines.append(f"- [{m['category']}] {m['key']}: {m['value']}")
        parts.append("【사용자 기억 정보】\n" + "\n".join(mem_lines))

    # 2. 최근 작업 이력
    tasks = await get_recent_tasks(email, limit=5)
    if tasks:
        task_lines = []
        for t in tasks:
            from datetime import datetime
            ts = datetime.fromtimestamp(t["created_at"]).strftime("%m/%d %H:%M")
            task_lines.append(f"- [{ts}] {t['task_type']}: {t['task_input'][:80]}")
        parts.append("【최근 작업 이력】\n" + "\n".join(task_lines))

    # 3. 최근 대화 이력
    convs = await get_recent_conversations(email, limit=6)
    if convs:
        conv_lines = []
        for c in convs:
            role_kr = "사용자" if c["role"] == "user" else "AI"
            conv_lines.append(f"{role_kr}: {c['content'][:150]}")
        parts.append("【최근 대화】\n" + "\n".join(conv_lines))

    if not parts:
        return ""

    return "\n\n".join(parts) + "\n\n위 정보를 참고하여 개인화된 응답을 해주세요. 기억 정보를 자연스럽게 활용하되, 기억이 있다는 것을 노골적으로 드러내지 마세요."

# ═══ API 엔드포인트 ═══
@router.get("/api/memory/list")
async def memory_list(email: str = ""):
    email = email.strip().lower()
    if not email:
        return JSONResponse({"error": "email required"}, status_code=400)
    memories = await get_all_memories(email, limit=50)
    tasks = await get_recent_tasks(email, limit=20)
    conv_count_row = await _db_read_one(
        "SELECT COUNT(*) as cnt FROM conversations WHERE email=?", (email,)
    )
    conv_count = conv_count_row["cnt"] if conv_count_row else 0
    return {
        "ok": True,
        "memories": memories,
        "tasks": tasks,
        "conversation_count": conv_count,
        "memory_count": len(memories)
    }

@router.delete("/api/memory/delete")
async def memory_delete(request: Request):
    try:
        body = await request.json()
    except:
        return JSONResponse({"error": "invalid json"}, status_code=400)
    email = (body.get("email") or "").strip().lower()
    memory_id = body.get("id")
    if not email or not memory_id:
        return JSONResponse({"error": "email and id required"}, status_code=400)
    await delete_memory(email, memory_id)
    return {"ok": True, "deleted": memory_id}

@router.delete("/api/memory/clear")
async def memory_clear(request: Request):
    try:
        body = await request.json()
    except:
        return JSONResponse({"error": "invalid json"}, status_code=400)
    email = (body.get("email") or "").strip().lower()
    target = body.get("target", "all")
    if not email:
        return JSONResponse({"error": "email required"}, status_code=400)
    if target in ("all", "memory"):
        await _db_write_sync("DELETE FROM user_memory WHERE email=?", (email,))
    if target in ("all", "conversations"):
        await _db_write_sync("DELETE FROM conversations WHERE email=?", (email,))
    if target in ("all", "tasks"):
        await _db_write_sync("DELETE FROM task_history WHERE email=?", (email,))
    return {"ok": True, "cleared": target}

@router.post("/api/memory/add")
async def memory_add(request: Request):
    try:
        body = await request.json()
    except:
        return JSONResponse({"error": "invalid json"}, status_code=400)
    email = (body.get("email") or "").strip().lower()
    category = (body.get("category") or "general")[:50]
    key = _sanitize_text(body.get("key") or "")[:200]
    value = _sanitize_text(body.get("value") or "")[:2000]
    if not email or not key or not value:
        return JSONResponse({"error": "email, key, value required"}, status_code=400)
    await save_memory(email, category, key, value, source="manual", importance=8)
    return {"ok": True}

@router.post("/api/task/log")
async def task_log(request: Request):
    """모든 기능(요약/번역/검색/MARL 등)에서 작업 이력 저장"""
    try:
        body = await request.json()
    except:
        return JSONResponse({"error": "invalid json"}, status_code=400)
    email = (body.get("email") or "").strip().lower()
    task_type = (body.get("type") or "unknown")[:50]
    task_input = _sanitize_text(body.get("input") or "")[:2000]
    task_output = _sanitize_text(body.get("output") or "")[:2000]
    page_url = (body.get("url") or "")[:500]
    page_title = (body.get("title") or "")[:200]
    if not email or not task_input:
        return JSONResponse({"error": "email and input required"}, status_code=400)
    await save_task(email, task_type, task_input, task_output, page_url, page_title)
    # 중요한 작업은 기억으로도 추출
    if len(task_input) > 20:
        import asyncio
        asyncio.create_task(extract_memories_from_conversation(email, task_input, task_output, page_url))
    return {"ok": True}