package initialize

import (
	"os"

	"git.echol.cn/loser/st/server/global"
	"git.echol.cn/loser/st/server/model/app"
	"git.echol.cn/loser/st/server/model/example"
	"git.echol.cn/loser/st/server/model/system"

	"go.uber.org/zap"
	"gorm.io/gorm"
)

func Gorm() *gorm.DB {
	switch global.GVA_CONFIG.System.DbType {
	case "mysql":
		global.GVA_ACTIVE_DBNAME = &global.GVA_CONFIG.Mysql.Dbname
		return GormMysql()
	case "pgsql":
		global.GVA_ACTIVE_DBNAME = &global.GVA_CONFIG.Pgsql.Dbname
		return GormPgSql()
	case "oracle":
		global.GVA_ACTIVE_DBNAME = &global.GVA_CONFIG.Oracle.Dbname
		return GormOracle()
	case "mssql":
		global.GVA_ACTIVE_DBNAME = &global.GVA_CONFIG.Mssql.Dbname
		return GormMssql()
	case "sqlite":
		global.GVA_ACTIVE_DBNAME = &global.GVA_CONFIG.Sqlite.Dbname
		return GormSqlite()
	default:
		global.GVA_ACTIVE_DBNAME = &global.GVA_CONFIG.Mysql.Dbname
		return GormMysql()
	}
}

func RegisterTables() {
	if global.GVA_CONFIG.System.DisableAutoMigrate {
		global.GVA_LOG.Info("auto-migrate is disabled, skipping table registration")
		return
	}

	// 初始化 PostgreSQL 扩展（仅创建 pgvector 扩展）
	InitPgSQLExtension()

	db := global.GVA_DB
	err := db.AutoMigrate(

		// System tables (管理后台表 - 不修改)
		system.SysApi{},
		system.SysIgnoreApi{},
		system.SysUser{},
		system.SysBaseMenu{},
		system.JwtBlacklist{},
		system.SysAuthority{},
		system.SysDictionary{},
		system.SysOperationRecord{},
		system.SysAutoCodeHistory{},
		system.SysDictionaryDetail{},
		system.SysBaseMenuParameter{},
		system.SysBaseMenuBtn{},
		system.SysAuthorityBtn{},
		system.SysAutoCodePackage{},
		system.SysExportTemplate{},
		system.Condition{},
		system.JoinTemplate{},
		system.SysParams{},
		system.SysVersion{},
		system.SysError{},
		system.SysApiToken{},
		system.SysLoginLog{},

		// Example tables
		example.ExaFile{},
		example.ExaCustomer{},
		example.ExaFileChunk{},
		example.ExaFileUploadAndDownload{},
		example.ExaAttachmentCategory{},

		// App tables (前台应用表 - 新增)
		app.AppUser{},
		app.AppUserSession{},
		app.AICharacter{},
		app.AppUserFavoriteCharacter{},
		app.AIChat{},
		app.AIChatMember{},
		app.AIMessage{},
		app.AIMessageSwipe{},
		app.AIMemoryVector{},
		app.AIProvider{},
		app.AIModel{},
		app.AIFile{},
		app.AIPreset{},
		app.AIWorldInfo{},
		app.AIUsageStat{},
	)
	if err != nil {
		global.GVA_LOG.Error("register table failed", zap.Error(err))
		os.Exit(0)
	}

	// 修复 PostgreSQL 序列（确保序列值与现有数据一致）
	fixPostgresSequences()

	// 创建向量索引（必须在 AutoMigrate 之后）
	CreateVectorIndexes()

	err = bizModel()

	if err != nil {
		global.GVA_LOG.Error("register biz_table failed", zap.Error(err))
		os.Exit(0)
	}
	global.GVA_LOG.Info("register table success")
}

// fixPostgresSequences 修复 PostgreSQL 自增序列与现有数据不一致的问题
// AutoMigrate 后序列可能落后于已有数据的 max(id)，导致插入时主键冲突
func fixPostgresSequences() {
	if global.GVA_CONFIG.System.DbType != "pgsql" {
		return
	}

	// 需要修复序列的表名列表
	tables := []string{
		"ai_characters",
		"app_users",
		"app_user_sessions",
		"app_user_favorite_characters",
	}

	for _, table := range tables {
		seqName := table + "_id_seq"
		sql := "SELECT setval('" + seqName + "', COALESCE((SELECT MAX(id) FROM " + table + "), 0) + 1, false)"
		if err := global.GVA_DB.Exec(sql).Error; err != nil {
			global.GVA_LOG.Warn("fix sequence failed", zap.String("table", table), zap.Error(err))
		}
	}
}