package database

import (
	"log"
	"os"
	"strconv"
	"strings"
	"time"

	"soul-api/internal/model"

	"gorm.io/driver/mysql"
	"gorm.io/gorm"
	"gorm.io/gorm/logger"
)

var db *gorm.DB

// Init 使用 DSN 连接 MySQL，供 handler 通过 DB() 使用
func Init(dsn string) error {
	// 慢查询阈值：默认 5 秒，避免 GORM 默认 200ms 导致控制台刷屏；可通过 SLOW_SQL_THRESHOLD_MS 覆盖
	slowMs := 5000
	if s := os.Getenv("SLOW_SQL_THRESHOLD_MS"); s != "" {
		if n, e := strconv.Atoi(s); e == nil && n > 0 {
			slowMs = n
		}
	}
	gormLogger := logger.New(
		log.New(os.Stdout, "\r\n", log.LstdFlags),
		logger.Config{
			SlowThreshold:             time.Duration(slowMs) * time.Millisecond,
			IgnoreRecordNotFoundError: true,
			Colorful:                  true,
		},
	)

	var err error
	db, err = gorm.Open(mysql.Open(dsn), &gorm.Config{Logger: gormLogger})
	if err != nil {
		return err
	}

	skipMigrate := strings.ToLower(strings.TrimSpace(os.Getenv("SKIP_AUTO_MIGRATE")))
	if skipMigrate == "1" || skipMigrate == "true" || skipMigrate == "yes" {
		log.Println("database: SKIP_AUTO_MIGRATE enabled, skipping schema migration")
		log.Println("database: connected")
		return nil
	}

	if err := db.AutoMigrate(&model.WechatCallbackLog{}); err != nil {
		log.Printf("database: wechat_callback_logs migrate warning: %v", err)
	}
	if err := db.AutoMigrate(&model.Withdrawal{}); err != nil {
		log.Printf("database: withdrawals migrate warning: %v", err)
	}
	if err := db.AutoMigrate(&model.MatchRecord{}); err != nil {
		log.Printf("database: match_records migrate warning: %v", err)
	}
	if err := db.AutoMigrate(&model.UserAddress{}); err != nil {
		log.Printf("database: user_addresses migrate warning: %v", err)
	}
	if err := db.AutoMigrate(&model.VipRole{}); err != nil {
		log.Printf("database: vip_roles migrate warning: %v", err)
	}
	if err := db.AutoMigrate(&model.Order{}); err != nil {
		log.Printf("database: orders migrate warning: %v", err)
	}
	if err := db.AutoMigrate(&model.UserBalance{}); err != nil {
		log.Printf("database: user_balances migrate warning: %v", err)
	}
	if err := db.AutoMigrate(&model.BalanceTransaction{}); err != nil {
		log.Printf("database: balance_transactions migrate warning: %v", err)
	}
	if err := db.AutoMigrate(&model.Mentor{}); err != nil {
		log.Printf("database: mentors migrate warning: %v", err)
	}
	if err := db.AutoMigrate(&model.MentorConsultation{}); err != nil {
		log.Printf("database: mentor_consultations migrate warning: %v", err)
	}
	if err := db.AutoMigrate(&model.AuthorConfig{}); err != nil {
		log.Printf("database: author_config migrate warning: %v", err)
	}
	if err := db.AutoMigrate(&model.AdminUser{}); err != nil {
		log.Printf("database: admin_users migrate warning: %v", err)
	}
	if err := db.AutoMigrate(&model.CkbSubmitRecord{}); err != nil {
		log.Printf("database: ckb_submit_records migrate warning: %v", err)
	}
	if err := db.AutoMigrate(&model.CkbLeadRecord{}); err != nil {
		log.Printf("database: ckb_lead_records migrate warning: %v", err)
	}
	if err := db.AutoMigrate(&model.Person{}); err != nil {
		log.Printf("database: persons migrate warning: %v", err)
	}
	// persons 历史库可能因旧索引冲突导致 AutoMigrate 中断，补一层列级自愈，避免 /api/db/persons 报 Unknown column。
	ensurePersonSchema(db)
	if err := db.AutoMigrate(&model.LinkTag{}); err != nil {
		log.Printf("database: link_tags migrate warning: %v", err)
	}
	// 以下表业务大量使用，必须参与 AutoMigrate，否则旧库缺字段会导致订单/用户/VIP 等接口报错
	if err := db.AutoMigrate(&model.User{}); err != nil {
		log.Printf("database: users migrate warning: %v", err)
	}
	if err := db.AutoMigrate(&model.SystemConfig{}); err != nil {
		log.Printf("database: system_config migrate warning: %v", err)
	}
	if err := db.AutoMigrate(&model.Chapter{}); err != nil {
		log.Printf("database: chapters migrate warning: %v", err)
	}
	if err := db.AutoMigrate(&model.GiftPayRequest{}); err != nil {
		log.Printf("database: gift_pay_requests migrate warning: %v", err)
	}
	if err := db.AutoMigrate(&model.UserRule{}); err != nil {
		log.Printf("database: user_rules migrate warning: %v", err)
	}
	if err := db.AutoMigrate(&model.UserTrack{}); err != nil {
		log.Printf("database: user_tracks migrate warning: %v", err)
	}
	if err := db.AutoMigrate(&model.UserRuleCompletion{}); err != nil {
		log.Printf("database: user_rule_completions migrate warning: %v", err)
	}
	log.Println("database: connected")
	return nil
}

// DB 返回全局 *gorm.DB，仅在 Init 成功后调用
func DB() *gorm.DB {
	return db
}

func ensurePersonSchema(db *gorm.DB) {
	m := db.Migrator()
	if !m.HasColumn(&model.Person{}, "is_pinned") {
		if err := db.Exec("ALTER TABLE persons ADD COLUMN is_pinned TINYINT(1) NOT NULL DEFAULT 0 COMMENT '置顶到小程序首页'").Error; err != nil {
			log.Printf("database: persons schema ensure warning: %v; action=add is_pinned", err)
		}
	}
	if !m.HasColumn(&model.Person{}, "person_source") {
		if err := db.Exec("ALTER TABLE persons ADD COLUMN person_source VARCHAR(32) NOT NULL DEFAULT '' COMMENT '来源：空=后台手工；vip_sync=超级个体同步'").Error; err != nil {
			log.Printf("database: persons schema ensure warning: %v; action=add person_source", err)
		}
	}
	if !m.HasIndex(&model.Person{}, "idx_persons_is_pinned") {
		if err := db.Exec("CREATE INDEX idx_persons_is_pinned ON persons(is_pinned)").Error; err != nil {
			log.Printf("database: persons schema ensure warning: %v; action=create idx_persons_is_pinned", err)
		}
	}
}