import json
import sqlite3
from fastapi import FastAPI, HTTPException, status, Depends
from fastapi.middleware.cors import CORSMiddleware
from database import init_db, get_db
from models import RegisterRequest, LoginRequest, AuthResponse, SaveGameRequest, SyncTickRequest
from auth import hash_password, verify_password, create_access_token, get_current_user_id
import engine

app = FastAPI(title="El Puro API", version="1.1.0")

app.add_middleware(
    CORSMiddleware,
    allow_origins=["*"],
    allow_credentials=True,
    allow_methods=["*"],
    allow_headers=["*"],
)

@app.on_event("startup")
def startup_event():
    init_db()

@app.get("/api/health")
def health_check():
    return {"status": "ok", "app": "El Puro", "version": "1.1.0"}

@app.post("/api/auth/register", response_model=AuthResponse)
def register(req: RegisterRequest):
    if req.website_hp and req.website_hp.strip():
        raise HTTPException(
            status_code=status.HTTP_400_BAD_REQUEST,
            detail="Registration verification failed."
        )

    clean_username = req.username.strip()
    if not clean_username:
        raise HTTPException(status_code=400, detail="Username cannot be blank.")

    hashed = hash_password(req.password)

    try:
        with get_db() as conn:
            cursor = conn.cursor()
            cursor.execute(
                "INSERT INTO users (username, password_hash) VALUES (?, ?)",
                (clean_username, hashed)
            )
            user_id = cursor.lastrowid
            
            # Initialize clean server authoritative game state
            init_state = engine.get_initial_state()
            cursor.execute(
                "INSERT INTO saves (user_id, save_data, updated_at) VALUES (?, ?, CURRENT_TIMESTAMP)",
                (user_id, json.dumps(init_state))
            )
            conn.commit()
    except sqlite3.IntegrityError:
        raise HTTPException(
            status_code=status.HTTP_409_CONFLICT,
            detail="Username already taken."
        )

    token = create_access_token({"sub": str(user_id), "username": clean_username})
    return AuthResponse(token=token, username=clean_username)

@app.post("/api/auth/login", response_model=AuthResponse)
def login(req: LoginRequest):
    clean_username = req.username.strip()
    with get_db() as conn:
        cursor = conn.cursor()
        cursor.execute(
            "SELECT id, username, password_hash FROM users WHERE username = ?",
            (clean_username,)
        )
        row = cursor.fetchone()

    if not row or not verify_password(req.password, row["password_hash"]):
        raise HTTPException(
            status_code=status.HTTP_401_UNAUTHORIZED,
            detail="Invalid username or password."
        )

    user_id = row["id"]
    token = create_access_token({"sub": str(user_id), "username": clean_username})
    return AuthResponse(token=token, username=clean_username)

@app.get("/api/game/state")
def get_game_state(user_id: int = Depends(get_current_user_id)):
    with get_db() as conn:
        cursor = conn.cursor()
        cursor.execute("SELECT save_data, updated_at FROM saves WHERE user_id = ?", (user_id,))
        row = cursor.fetchone()

    if not row:
        init_state = engine.get_initial_state()
        return {"has_save": True, "save_data": init_state, "updated_at": None}

    try:
        data = json.loads(row["save_data"])
        # Process authoritative offline progress up to now
        data = engine.process_offline_and_ticks(data)
        return {"has_save": True, "save_data": data, "updated_at": row["updated_at"]}
    except Exception:
        return {"has_save": True, "save_data": engine.get_initial_state(), "updated_at": None}

@app.post("/api/game/tick")
def sync_tick(req: SyncTickRequest, user_id: int = Depends(get_current_user_id)):
    """Authoritative periodic tick (called every 5-10s): applies queued actions and computes tick progress."""
    with get_db() as conn:
        cursor = conn.cursor()
        cursor.execute("SELECT save_data FROM saves WHERE user_id = ?", (user_id,))
        row = cursor.fetchone()

        if row:
            try:
                state = json.loads(row["save_data"])
            except Exception:
                state = engine.get_initial_state()
        else:
            state = engine.get_initial_state()

        # 1. Apply authorized player actions
        if req.actions:
            state = engine.apply_actions(state, req.actions)

        # 2. Advance production, automation, and offline ticks
        state = engine.process_offline_and_ticks(state)

        # 3. Persist authoritative clean state
        cursor.execute("""
            INSERT INTO saves (user_id, save_data, updated_at)
            VALUES (?, ?, CURRENT_TIMESTAMP)
            ON CONFLICT(user_id) DO UPDATE SET
                save_data = excluded.save_data,
                updated_at = CURRENT_TIMESTAMP
        """, (user_id, json.dumps(state)))
        conn.commit()

    return {"status": "ok", "save_data": state}

@app.post("/api/game/save")
def save_game_state(req: SaveGameRequest, user_id: int = Depends(get_current_user_id)):
    # Sanitize data before persisting
    clean_state = engine.sanitize_state(req.save_data)
    json_data = json.dumps(clean_state)
    with get_db() as conn:
        cursor = conn.cursor()
        cursor.execute("""
            INSERT INTO saves (user_id, save_data, updated_at)
            VALUES (?, ?, CURRENT_TIMESTAMP)
            ON CONFLICT(user_id) DO UPDATE SET
                save_data = excluded.save_data,
                updated_at = CURRENT_TIMESTAMP
        """, (user_id, json_data))
        conn.commit()

    return {"status": "saved", "save_data": clean_state}