package com.example.demo.auth;

import com.example.demo.common.AppDefaultsProperties;
import org.springframework.beans.factory.annotation.Autowired;
import com.example.demo.common.ShopDefaultsProperties;
import org.springframework.jdbc.core.JdbcTemplate;
import org.springframework.jdbc.support.GeneratedKeyHolder;
import org.springframework.stereotype.Service;
import org.springframework.transaction.annotation.Transactional;

import java.sql.PreparedStatement;
import java.util.HashMap;
import java.util.Map;

@Service
public class RegisterService {

    private final JdbcTemplate jdbcTemplate;
    private final JwtService jwtService;
    private final JwtProperties jwtProps;
    private final ShopDefaultsProperties shopDefaults;
    private AppDefaultsProperties appDefaults;

    public RegisterService(JdbcTemplate jdbcTemplate,
                           JwtService jwtService,
                           JwtProperties jwtProps,
                           ShopDefaultsProperties shopDefaults) {
        this.jdbcTemplate = jdbcTemplate;
        this.jwtService = jwtService;
        this.jwtProps = jwtProps;
        this.shopDefaults = shopDefaults;
    }

    @Autowired
    public void setAppDefaults(AppDefaultsProperties appDefaults) {
        this.appDefaults = appDefaults;
    }

    private String hashPassword(String raw) {
        try {
            return org.springframework.security.crypto.bcrypt.BCrypt.hashpw(raw, org.springframework.security.crypto.bcrypt.BCrypt.gensalt(10));
        } catch (Exception e) {
            throw new IllegalStateException("密码加密失败", e);
        }
    }

    public static class RegisterRequest {
        public String phone;      // 必填：11位
        public String name;       // 可选：默认用脱敏手机号
        public String password;   // 可选：如提供则保存密码哈希
    }

    public static class RegisterResponse {
        public String token;
        public long expiresIn;
        public Map<String,Object> user;
    }

    @Transactional
    public RegisterResponse register(RegisterRequest req) {
        ensurePhoneFormat(req.phone);
        String phone = req.phone.trim();
        String displayName = (req.name == null || req.name.isBlank()) ? maskPhoneForName(phone) : req.name.trim();

        // 已存在则直接签发令牌
        var existing = jdbcTemplate.queryForList("SELECT id, shop_id FROM users WHERE phone=? LIMIT 1", phone);
        Long userId;
        Long shopId;
        if (!existing.isEmpty()) {
            Map<String,Object> row = existing.get(0);
            userId = ((Number)row.get("id")).longValue();
            shopId = ((Number)row.get("shop_id")).longValue();
        } else {
            // 1) 创建店铺
            String shopName = String.format(shopDefaults.getNamePattern(), displayName);
            GeneratedKeyHolder shopKey = new GeneratedKeyHolder();
            jdbcTemplate.update(con -> {
                PreparedStatement ps = con.prepareStatement(
                        "INSERT INTO shops(name, status, created_at, updated_at) VALUES (?,1,NOW(),NOW())",
                        java.sql.Statement.RETURN_GENERATED_KEYS);
                ps.setString(1, shopName);
                return ps;
            }, shopKey);
            Number shopGenId = shopKey.getKey();
            if (shopGenId == null) throw new IllegalStateException("创建店铺失败");
            shopId = shopGenId.longValue();

            // 2) 创建店主用户（owner）
            GeneratedKeyHolder userKey = new GeneratedKeyHolder();
            final Long sid = shopId;
            jdbcTemplate.update(con -> {
                PreparedStatement ps = con.prepareStatement(
                        "INSERT INTO users(shop_id, phone, name, role, password_hash, status, is_owner, created_at, updated_at) " +
                                "VALUES (?,?,?,?,?,1,1,NOW(),NOW())",
                        java.sql.Statement.RETURN_GENERATED_KEYS);
                ps.setLong(1, sid);
                ps.setString(2, phone);
                ps.setString(3, displayName);
                ps.setString(4, shopDefaults.getOwnerRole());
                // 如提供密码，存入哈希；否则设为 NULL
                String pwd = (req.password == null || req.password.isBlank()) ? null : hashPassword(req.password);
                if (pwd != null) ps.setString(5, pwd); else ps.setNull(5, java.sql.Types.VARCHAR);
                return ps;
            }, userKey);
            Number userGenId = userKey.getKey();
            if (userGenId == null) throw new IllegalStateException("创建用户失败");
            userId = userGenId.longValue();

            // 3) 创建默认账户（现金/银行存款/微信）
            createDefaultAccounts(shopId, userId);
        }

        String token = jwtService.signToken(userId, shopId, phone, "register");
        RegisterResponse out = new RegisterResponse();
        out.token = token;
        out.expiresIn = jwtProps.getTtlSeconds();
        HashMap<String,Object> userMap = new HashMap<>();
        userMap.put("userId", userId);
        userMap.put("shopId", shopId);
        userMap.put("phone", phone);
        out.user = userMap;
        return out;
    }

    private void createDefaultAccounts(Long shopId, Long userId) {
        // 现金
        jdbcTemplate.update(
                "INSERT INTO accounts(shop_id,user_id,name,`type`,balance,status,created_at,updated_at) " +
                        "SELECT ?, ?, ?, 'cash', 0, 1, NOW(), NOW() FROM DUAL WHERE NOT EXISTS (SELECT 1 FROM accounts WHERE shop_id=? AND name=?)",
                shopId, userId, appDefaults.getAccountCashName(), shopId, appDefaults.getAccountCashName());
        // 银行存款
        jdbcTemplate.update(
                "INSERT INTO accounts(shop_id,user_id,name,`type`,balance,status,created_at,updated_at) " +
                        "SELECT ?, ?, ?, 'bank', 0, 1, NOW(), NOW() FROM DUAL WHERE NOT EXISTS (SELECT 1 FROM accounts WHERE shop_id=? AND name=?)",
                shopId, userId, appDefaults.getAccountBankName(), shopId, appDefaults.getAccountBankName());
        // 微信
        jdbcTemplate.update(
                "INSERT INTO accounts(shop_id,user_id,name,`type`,balance,status,created_at,updated_at) " +
                        "SELECT ?, ?, ?, 'wechat', 0, 1, NOW(), NOW() FROM DUAL WHERE NOT EXISTS (SELECT 1 FROM accounts WHERE shop_id=? AND name=?)",
                shopId, userId, appDefaults.getAccountWechatName(), shopId, appDefaults.getAccountWechatName());
    }

    private void ensurePhoneFormat(String phone) {
        if (phone == null || phone.isBlank()) throw new IllegalArgumentException("手机号不能为空");
        String p = phone.replaceAll("\\s+", "");
        if (!p.matches("^1\\d{10}$")) throw new IllegalArgumentException("手机号格式不正确");
    }

    private static String maskPhoneForName(String phone) {
        String p = String.valueOf(phone);
        if (p.length() == 11) return "用户" + p.substring(0,3) + "****" + p.substring(7);
        return "手机用户";
    }
}