package imtenant

import (
	"context"
	"strings"
	"testing"
)

func TestNormalizeMySQLTimeOptions(t *testing.T) {
	link, err := normalizeMySQLTimeOptions("user:pass@tcp(127.0.0.1:3306)/tinode?charset=utf8mb4")
	if err != nil {
		t.Fatalf("normalize raw mysql dsn: %v", err)
	}
	if !strings.HasPrefix(link, "mysql:user:pass@tcp(127.0.0.1:3306)/tinode?") {
		t.Fatalf("unexpected normalized link: %s", link)
	}
	if !strings.Contains(link, "loc=UTC") || !strings.Contains(link, "parseTime=true") {
		t.Fatalf("missing required time options: %s", link)
	}
}

func TestNormalizeMySQLTimeOptionsRejectsUnsupportedFormat(t *testing.T) {
	if _, err := normalizeMySQLTimeOptions("postgres://user:pass@127.0.0.1:5432/tinode"); err == nil {
		t.Fatal("expected unsupported format error")
	}
}

func TestReplaceMySQLDatabaseUsesUTC(t *testing.T) {
	link, err := replaceMySQLDatabase("mysql:user:pass@tcp(127.0.0.1:3306)/hotgo?loc=Local&parseTime=false&charset=utf8mb4", "tinode")
	if err != nil {
		t.Fatal(err)
	}
	for _, expected := range []string{"/tinode?", "loc=UTC", "parseTime=true", "charset=utf8mb4"} {
		if !strings.Contains(link, expected) {
			t.Fatalf("link %q does not contain %q", link, expected)
		}
	}
}

func TestNextSnowflakeID(t *testing.T) {
	first, err := NextSnowflakeID(context.Background())
	if err != nil {
		t.Fatal(err)
	}
	second, err := NextSnowflakeID(context.Background())
	if err != nil {
		t.Fatal(err)
	}
	if first <= 0 || second <= first {
		t.Fatalf("Snowflake IDs are not increasing: %d, %d", first, second)
	}
}