package repository

import (
	"context"
	"testing"

	"github.com/stretchr/testify/assert"
	"github.com/stretchr/testify/require"
	"gorm.io/gorm"

	"github.com/gochat/gochat/internal/model"
)

// --- Helpers for CustomAttributeDefinition repo tests ---

func setupCustomAttrDefTestDB(t *testing.T) *gorm.DB {
	t.Helper()
	return setupTestDB(t, &model.CustomAttributeDefinition{})
}

func createCustomAttrDefTestAccount(t *testing.T, db *gorm.DB) *model.Account {
	t.Helper()
	account := &model.Account{Name: "Custom Attr Def Test Account"}
	err := db.Create(account).Error
	require.NoError(t, err, "failed to create test account")
	return account
}

// ===========================================================================
// Create tests
// ===========================================================================

func TestCustomAttributeDefinitionRepo_Create(t *testing.T) {
	db := setupCustomAttrDefTestDB(t)
	ctx := context.Background()
	repo := NewCustomAttributeDefinitionRepo(db)

	account := createCustomAttrDefTestAccount(t, db)

	def := &model.CustomAttributeDefinition{
		AccountID:            account.ID,
		AttributeName:        "priority",
		AttributeDisplayName: "Priority",
		AttributeType:        "text",
		AttributeModel:       "conversation",
		Description:          "Conversation priority level",
	}

	err := repo.Create(ctx, def)
	require.NoError(t, err)
	assert.NotZero(t, def.ID)
	assert.Equal(t, account.ID, def.AccountID)
	assert.Equal(t, "priority", def.AttributeName)
	assert.Equal(t, "text", def.AttributeType)
	assert.Equal(t, "conversation", def.AttributeModel)
}

func TestCustomAttributeDefinitionRepo_Create_DuplicateAttributeName(t *testing.T) {
	db := setupCustomAttrDefTestDB(t)
	ctx := context.Background()
	repo := NewCustomAttributeDefinitionRepo(db)

	account := createCustomAttrDefTestAccount(t, db)

	def1 := &model.CustomAttributeDefinition{
		AccountID:            account.ID,
		AttributeName:        "priority",
		AttributeDisplayName: "Priority",
		AttributeType:        "text",
		AttributeModel:       "conversation",
	}
	require.NoError(t, repo.Create(ctx, def1))

	// Same attribute_name + same account + same model should fail (unique index)
	def2 := &model.CustomAttributeDefinition{
		AccountID:            account.ID,
		AttributeName:        "priority",
		AttributeDisplayName: "Priority Level",
		AttributeType:        "number",
		AttributeModel:       "conversation",
	}
	err := repo.Create(ctx, def2)
	assert.Error(t, err, "duplicate attribute_name within same account+model should fail")
}

// ===========================================================================
// GetByID tests
// ===========================================================================

func TestCustomAttributeDefinitionRepo_GetByID(t *testing.T) {
	db := setupCustomAttrDefTestDB(t)
	ctx := context.Background()
	repo := NewCustomAttributeDefinitionRepo(db)

	account := createCustomAttrDefTestAccount(t, db)

	def := &model.CustomAttributeDefinition{
		AccountID:            account.ID,
		AttributeName:        "status",
		AttributeDisplayName: "Status",
		AttributeType:        "list",
		AttributeModel:       "contact",
	}
	require.NoError(t, repo.Create(ctx, def))

	found, err := repo.GetByID(ctx, def.ID)
	require.NoError(t, err)
	assert.Equal(t, def.ID, found.ID)
	assert.Equal(t, "status", found.AttributeName)
	assert.Equal(t, "list", found.AttributeType)
}

func TestCustomAttributeDefinitionRepo_GetByID_NotFound(t *testing.T) {
	db := setupCustomAttrDefTestDB(t)
	ctx := context.Background()
	repo := NewCustomAttributeDefinitionRepo(db)

	_, err := repo.GetByID(ctx, 9999)
	assert.ErrorIs(t, err, gorm.ErrRecordNotFound)
}

// ===========================================================================
// FindByAccount tests
// ===========================================================================

func TestCustomAttributeDefinitionRepo_FindByAccount(t *testing.T) {
	db := setupCustomAttrDefTestDB(t)
	ctx := context.Background()
	repo := NewCustomAttributeDefinitionRepo(db)

	account := createCustomAttrDefTestAccount(t, db)

	// Create multiple definitions for the same account
	for i, name := range []string{"attr_a", "attr_b", "attr_c"} {
		def := &model.CustomAttributeDefinition{
			AccountID:            account.ID,
			AttributeName:        name,
			AttributeDisplayName: "Attr " + name,
			AttributeType:        "text",
			AttributeModel:       "conversation",
			Description:          "Test desc " + string(rune('A'+i)),
		}
		require.NoError(t, repo.Create(ctx, def))
	}

	defs, total, err := repo.FindByAccount(ctx, account.ID, 0, 10)
	require.NoError(t, err)
	assert.Equal(t, int64(3), total)
	assert.Len(t, defs, 3)
}

func TestCustomAttributeDefinitionRepo_FindByAccount_Pagination(t *testing.T) {
	db := setupCustomAttrDefTestDB(t)
	ctx := context.Background()
	repo := NewCustomAttributeDefinitionRepo(db)

	account := createCustomAttrDefTestAccount(t, db)

	for i := 0; i < 5; i++ {
		def := &model.CustomAttributeDefinition{
			AccountID:            account.ID,
			AttributeName:        "paged_attr_" + string(rune('A'+i)),
			AttributeDisplayName: "Paged Attr",
			AttributeType:        "text",
			AttributeModel:       "conversation",
		}
		require.NoError(t, repo.Create(ctx, def))
	}

	defs, total, err := repo.FindByAccount(ctx, account.ID, 0, 2)
	require.NoError(t, err)
	assert.Equal(t, int64(5), total)
	assert.Len(t, defs, 2)

	defs2, total2, err := repo.FindByAccount(ctx, account.ID, 2, 2)
	require.NoError(t, err)
	assert.Equal(t, int64(5), total2)
	assert.Len(t, defs2, 2)
}

func TestCustomAttributeDefinitionRepo_FindByAccount_EmptyAccount(t *testing.T) {
	db := setupCustomAttrDefTestDB(t)
	ctx := context.Background()
	repo := NewCustomAttributeDefinitionRepo(db)

	defs, total, err := repo.FindByAccount(ctx, 9999, 0, 10)
	require.NoError(t, err)
	assert.Equal(t, int64(0), total)
	assert.Len(t, defs, 0)
}

// ===========================================================================
// FindByAccountAndModel tests
// ===========================================================================

func TestCustomAttributeDefinitionRepo_FindByAccountAndModel(t *testing.T) {
	db := setupCustomAttrDefTestDB(t)
	ctx := context.Background()
	repo := NewCustomAttributeDefinitionRepo(db)

	account := createCustomAttrDefTestAccount(t, db)

	// Create conversation attributes
	for _, name := range []string{"conv_priority", "conv_status"} {
		def := &model.CustomAttributeDefinition{
			AccountID:            account.ID,
			AttributeName:        name,
			AttributeDisplayName: name,
			AttributeType:        "text",
			AttributeModel:       "conversation",
		}
		require.NoError(t, repo.Create(ctx, def))
	}

	// Create contact attributes
	for _, name := range []string{"contact_level", "contact_source"} {
		def := &model.CustomAttributeDefinition{
			AccountID:            account.ID,
			AttributeName:        name,
			AttributeDisplayName: name,
			AttributeType:        "text",
			AttributeModel:       "contact",
		}
		require.NoError(t, repo.Create(ctx, def))
	}

	convDefs, convTotal, err := repo.FindByAccountAndModel(ctx, account.ID, "conversation", 0, 10)
	require.NoError(t, err)
	assert.Equal(t, int64(2), convTotal)
	assert.Len(t, convDefs, 2)

	contactDefs, contactTotal, err := repo.FindByAccountAndModel(ctx, account.ID, "contact", 0, 10)
	require.NoError(t, err)
	assert.Equal(t, int64(2), contactTotal)
	assert.Len(t, contactDefs, 2)
}

// ===========================================================================
// Update tests
// ===========================================================================

func TestCustomAttributeDefinitionRepo_Update(t *testing.T) {
	db := setupCustomAttrDefTestDB(t)
	ctx := context.Background()
	repo := NewCustomAttributeDefinitionRepo(db)

	account := createCustomAttrDefTestAccount(t, db)

	def := &model.CustomAttributeDefinition{
		AccountID:            account.ID,
		AttributeName:        "priority",
		AttributeDisplayName: "Priority",
		AttributeType:        "text",
		AttributeModel:       "conversation",
	}
	require.NoError(t, repo.Create(ctx, def))

	def.AttributeDisplayName = "Priority Level"
	def.Description = "Updated description"

	err := repo.Update(ctx, def)
	require.NoError(t, err)

	found, err := repo.GetByID(ctx, def.ID)
	require.NoError(t, err)
	assert.Equal(t, "Priority Level", found.AttributeDisplayName)
	assert.Equal(t, "Updated description", found.Description)
}

// ===========================================================================
// Delete tests (soft delete)
// ===========================================================================

func TestCustomAttributeDefinitionRepo_Delete(t *testing.T) {
	db := setupCustomAttrDefTestDB(t)
	ctx := context.Background()
	repo := NewCustomAttributeDefinitionRepo(db)

	account := createCustomAttrDefTestAccount(t, db)

	def := &model.CustomAttributeDefinition{
		AccountID:            account.ID,
		AttributeName:        "temp_attr",
		AttributeDisplayName: "Temp",
		AttributeType:        "text",
		AttributeModel:       "conversation",
	}
	require.NoError(t, repo.Create(ctx, def))

	err := repo.Delete(ctx, def.ID)
	require.NoError(t, err)

	// Should not be findable via GetByID (soft delete filters it)
	_, err = repo.GetByID(ctx, def.ID)
	assert.ErrorIs(t, err, gorm.ErrRecordNotFound)
}

func TestCustomAttributeDefinitionRepo_Delete_NotFound(t *testing.T) {
	db := setupCustomAttrDefTestDB(t)
	ctx := context.Background()
	repo := NewCustomAttributeDefinitionRepo(db)

	// Deleting a non-existent record should still succeed (GORM soft delete on zero rows)
	err := repo.Delete(ctx, 9999)
	// GORM Delete with a specific ID that doesn't exist may or may not error depending on version
	// In practice, GORM won't return an error even if the record doesn't exist for soft delete
	assert.NoError(t, err)
}