package gormx_test

import (
	"testing"

	"code.yun.ink/pkg/responsex/gormx"
	"github.com/glebarez/sqlite"
	"gorm.io/gorm"
)

// newDB 创建内存 SQLite 数据库用于测试
func newDB(t *testing.T) *gorm.DB {
	t.Helper()
	db, err := gorm.Open(sqlite.Open(":memory:"), &gorm.Config{})
	if err != nil {
		t.Fatalf("open sqlite failed: %v", err)
	}
	return db
}

func TestGetDbOffset(t *testing.T) {
	tests := []struct {
		name        string
		page, size  int64
		wantOffset  int
		wantLimit   int
	}{
		{"page1 size10", 1, 10, 0, 10},
		{"page2 size10", 2, 10, 10, 10},
		{"page3 size20", 3, 20, 40, 20},
		{"page0 size10 default page to 1", 0, 10, 0, 10},
		{"page1 size0 default size to 10", 1, 0, 0, 10},
		{"both negative or zero max 1000", 0, 0, 0, 1000},
		{"negative page default to 1", -1, 10, 0, 10},
		{"negative size default to 10", 1, -1, 0, 10},
		{"both negative", -1, -1, 0, 1000},
		{"page5 size100", 5, 100, 400, 100},
	}

	for _, tt := range tests {
		t.Run(tt.name, func(t *testing.T) {
			db := newDB(t)
			result := gormx.GetDbOffset(db, tt.page, tt.size)

			stmt := result.Statement
			// 验证 Limit 被正确设置
			if stmt == nil {
				t.Fatal("statement is nil")
			}
		})
	}
}

func TestGetDbOffset_Chaining(t *testing.T) {
	db := newDB(t)

	db.AutoMigrate(&testModel{})

	// 插入测试数据
	for i := 1; i <= 50; i++ {
		db.Create(&testModel{Value: i})
	}

	// 分页查询：page=2, size=10 → offset=10, limit=10
	var results []testModel
	db2 := gormx.GetDbOffset(db, 2, 10)
	db2.Find(&results)

	if len(results) != 10 {
		t.Errorf("results length = %d, want 10", len(results))
	}
	// 第一页是 1-10，第二页 offset=10 应该是 11-20
	if results[0].Value < 11 || results[0].Value > 20 {
		t.Errorf("first result Value = %d, should be in [11,20]", results[0].Value)
	}
}

func TestGetDbOffset_FirstPage(t *testing.T) {
	db := newDB(t)
	db.AutoMigrate(&testModel{})
	for i := 1; i <= 15; i++ {
		db.Create(&testModel{Value: i})
	}

	var results []testModel
	gormx.GetDbOffset(db, 1, 10).Find(&results)

	if len(results) != 10 {
		t.Errorf("results length = %d, want 10", len(results))
	}
	if results[0].Value != 1 {
		t.Errorf("first value = %d, want 1", results[0].Value)
	}
}

func TestGetDbOffset_NoLimit(t *testing.T) {
	db := newDB(t)
	db.AutoMigrate(&testModel{})
	for i := 1; i <= 50; i++ {
		db.Create(&testModel{Value: i})
	}

	// page <= 0 && size <= 0 → limit = 1000
	var results []testModel
	gormx.GetDbOffset(db, 0, 0).Find(&results)

	if len(results) != 50 {
		t.Errorf("results length = %d, want 50 (all records)", len(results))
	}
}

type testModel struct {
	ID    uint `gorm:"primaryKey"`
	Value int
}