package migration

import (
	"fmt"
	"io"
	"os"
	"os/exec"
	eu "simrs-vx/internal/domain/main-entities/user"

	"ariga.io/atlas-provider-gorm/gormschema"
	"gorm.io/gorm"
	"gorm.io/gorm/schema"
)

type Config struct {
	DbCfg DbConf `yaml:"dbCfg"`
}

type DbConf struct {
	DSN          string `yaml:"dsn"`
	MaxOpenConns int    `yaml:"maxOpenConns"`
	MaxIdleConns int    `yaml:"maxIdleConns"`
	MaxIdleTime  int    `yaml:"maxIdleTime"`
}

func Loader() {
	gormCfg := &gorm.Config{
		NamingStrategy: schema.NamingStrategy{
			SingularTable: true,
			NoLowerCase:   true,
		},
	}
	stmts, err := gormschema.New("postgres", gormschema.WithConfig(gormCfg)).Load(GetEntities()...)
	if err != nil {
		fmt.Fprintf(os.Stderr, "failed to load gorm schema: %v\n", err)
		os.Exit(1)
	}
	_, _ = io.WriteString(os.Stdout, stmts)
}

func GetEntities() []any {
	return []any{
		&eu.User{},
	}
}

func runAtlas(args ...string) error {
	cmd := exec.Command("atlas", args...)
	cmd.Stdout = os.Stdout
	cmd.Stderr = os.Stderr
	return cmd.Run()
}

func logMsg(msg string) {
	fmt.Fprintln(os.Stderr, msg)
}

func Migrate() {
	Loader()
	logMsg("Running atlas migrate diff...")
	if err := runAtlas("migrate", "diff", "--env", "gorm"); err != nil {
		logMsg(fmt.Sprintf("Failed to run diff: %v", err))
		return
	}

	logMsg("Running atlas migrate apply...")
	if err := runAtlas("migrate", "apply", "--env", "gorm"); err != nil {
		logMsg(fmt.Sprintf("Failed to run apply: %v", err))
		return
	}

	logMsg("Migration complete")
}