from fastapi import APIRouter, Cookie, HTTPException, Request
from fastapi.responses import JSONResponse

from app.db import auth_db
from app.web.shared import (
    ChangePasswordRequest,
    CompleteRegistrationRequest,
    LoginRequest,
    RegisterRequest,
    ResendVerificationRequest,
    SendCodeRequest,
    VerifyEmailRequest,
    auth_error,
    require_user,
)

router = APIRouter()


@router.post("/api/auth/register")
async def api_auth_register(req: RegisterRequest):
    try:
        result = auth_db.register_user(req.email, req.password, req.invite_code)
        smtp_ready = auth_db.is_smtp_configured()
        return {
            "ok": True,
            "user": {k: v for k, v in result.items() if k not in ("verification_code", "user_id")},
            "dev_verification_code": None if smtp_ready else result.get("verification_code"),
            "email_sent": bool(result.get("email_sent")),
            "message": "注册成功，请查收邮箱验证码" if smtp_ready else "注册成功，请完成邮箱验证码验证",
        }
    except auth_db.AuthError as exc:
        auth_error(exc)


@router.post("/api/auth/send-code")
async def api_auth_send_code(req: SendCodeRequest):
    try:
        result = auth_db.send_registration_code(req.email)
        smtp_ready = auth_db.is_smtp_configured()
        return {
            "ok": True,
            "email": result["email"],
            "dev_verification_code": None if smtp_ready else result.get("verification_code"),
            "email_sent": bool(result.get("email_sent")),
            "message": "验证码已发送，请查收邮箱" if smtp_ready else "验证码已生成",
        }
    except auth_db.AuthError as exc:
        auth_error(exc)


@router.post("/api/auth/complete-registration")
async def api_auth_complete_registration(req: CompleteRegistrationRequest):
    try:
        user = auth_db.complete_registration(req.email, req.code, req.password, req.invite_code)
        return {"ok": True, "user": user, "message": "注册成功，请登录"}
    except auth_db.AuthError as exc:
        auth_error(exc)


@router.post("/api/auth/verify-email")
async def api_auth_verify_email(req: VerifyEmailRequest):
    try:
        user = auth_db.verify_email(req.email, req.code)
        return {"ok": True, "user": user, "message": "邮箱验证成功"}
    except auth_db.AuthError as exc:
        auth_error(exc)


@router.post("/api/auth/resend-verification")
async def api_auth_resend_verification(req: ResendVerificationRequest):
    try:
        result = auth_db.resend_verification_code(req.email)
        smtp_ready = auth_db.is_smtp_configured()
        return {
            "ok": True,
            "email": result["email"],
            "dev_verification_code": None if smtp_ready else result.get("verification_code"),
            "email_sent": bool(result.get("email_sent")),
            "message": "验证码已重新发送，请查收邮箱" if smtp_ready else "验证码已重新生成",
        }
    except auth_db.AuthError as exc:
        auth_error(exc)


@router.post("/api/auth/login")
async def api_auth_login(req: LoginRequest, request: Request = None):
    try:
        session = auth_db.login_user(req.email, req.password)
        auth_db.log_user_activity(session["user"]["id"], "login", "auth", ip=request.client.host if request.client else "")
        sub = auth_db.get_current_subscription(session["user"]["id"])
        next_path = "/app" if sub else "/subscription?welcome=1"
        resp = JSONResponse({
            "ok": True,
            "user": session["user"],
            "expires_at": session["expires_at"],
            "subscription": sub,
            "subscription_active": bool(sub),
            "next": next_path,
        })
        resp.set_cookie("altcoin_session", session["token"], httponly=True, samesite="lax", max_age=30 * 24 * 3600)
        return resp
    except auth_db.AuthError as exc:
        auth_error(exc, status_code=400)


@router.get("/api/auth/me")
async def api_auth_me(altcoin_session: str = Cookie(default="")):
    user = require_user(altcoin_session)
    sub = auth_db.get_current_subscription(user["id"])
    return {"ok": True, "user": user, "subscription": sub, "subscription_active": bool(sub)}


@router.post("/api/auth/change-password")
async def api_auth_change_password(req: ChangePasswordRequest, altcoin_session: str = Cookie(default="")):
    user = require_user(altcoin_session)
    try:
        return auth_db.change_password(user["id"], req.old_password, req.new_password)
    except auth_db.AuthError as exc:
        auth_error(exc)


@router.post("/api/auth/logout")
async def api_auth_logout(altcoin_session: str = Cookie(default="")):
    auth_db.logout_user(altcoin_session)
    resp = JSONResponse({"ok": True, "message": "已退出登录"})
    resp.delete_cookie("altcoin_session")
    return resp


@router.post("/api/subscriptions/free-trial")
async def api_subscription_free_trial(altcoin_session: str = Cookie(default="")):
    user = require_user(altcoin_session)
    try:
        sub = auth_db.claim_free_trial(user["id"])
        return {"ok": True, "subscription": sub, "message": "已开通新用户免费体验1个月"}
    except auth_db.AuthError as exc:
        auth_error(exc)


@router.get("/api/subscription/plans")
async def api_subscription_plans():
    auth_db.init_auth_db()
    conn = auth_db.get_conn()
    rows = conn.execute("SELECT * FROM subscription_plan ORDER BY sort_order ASC").fetchall()
    conn.close()
    return [dict(r) for r in rows]


@router.get("/api/referral/stats")
async def api_referral_stats(altcoin_session: str = Cookie(default="")):
    user = auth_db.get_user_by_session_token(altcoin_session)
    if not user:
        raise HTTPException(status_code=401, detail="请先登录")
    return auth_db.get_referral_stats(user["id"])