package testutil

import (
	"context"
	"path/filepath"
	"strings"
	"testing"

	"sub2api-cn-relay-manager/internal/store/sqlite"
)

func TestSQLiteTestDSN(t *testing.T) {
	tests := []struct {
		name               string
		fileName           string
		disableForeignKeys bool
		wantContains       []string
	}{
		{
			name:               "with foreign keys enabled",
			fileName:           "test.db",
			disableForeignKeys: false,
			wantContains: []string{
				"file:",
				"test.db",
				"_busy_timeout=5000",
			},
		},
		{
			name:               "with foreign keys disabled",
			fileName:           "test_fk.db",
			disableForeignKeys: true,
			wantContains: []string{
				"file:",
				"test_fk.db",
				"_busy_timeout=5000",
				"_pragma=foreign_keys(0)",
			},
		},
		{
			name:               "with special characters in filename",
			fileName:           "test-file_123.db",
			disableForeignKeys: false,
			wantContains: []string{
				"test-file_123.db",
			},
		},
	}

	for _, tt := range tests {
		t.Run(tt.name, func(t *testing.T) {
			dsn := SQLiteTestDSN(t, tt.fileName, tt.disableForeignKeys)

			for _, want := range tt.wantContains {
				if !strings.Contains(dsn, want) {
					t.Errorf("SQLiteTestDSN() = %v, want to contain %v", dsn, want)
				}
			}

			// Verify DSN starts with file:
			if !strings.HasPrefix(dsn, "file:") {
				t.Errorf("SQLiteTestDSN() = %v, want to start with 'file:'", dsn)
			}
		})
	}
}

func TestSQLiteTestDSN_CreatesUniquePaths(t *testing.T) {
	dsn1 := SQLiteTestDSN(t, "test.db", false)
	dsn2 := SQLiteTestDSN(t, "test.db", false)

	// Each call should return a different path (different temp dirs)
	if dsn1 == dsn2 {
		t.Error("SQLiteTestDSN() should create unique paths for each call")
	}
}

func TestOpenSQLiteStore(t *testing.T) {
	dsn := SQLiteTestDSN(t, "open_test.db", false)
	store := OpenSQLiteStore(t, dsn)

	if store == nil {
		t.Fatal("OpenSQLiteStore() returned nil store")
	}

	// Verify store is functional by checking connection
	ctx := context.Background()
	if err := store.SQLDB().PingContext(ctx); err != nil {
		t.Errorf("store.SQLDB().PingContext() error = %v", err)
	}

	// Cleanup
	CloseSQLiteStore(t, store)
}

func TestOpenSQLiteStore_WithForeignKeysDisabled(t *testing.T) {
	dsn := SQLiteTestDSN(t, "open_test_nofk.db", true)
	store := OpenSQLiteStore(t, dsn)

	if store == nil {
		t.Fatal("OpenSQLiteStore() returned nil store")
	}

	// Verify store works
	ctx := context.Background()
	if err := store.SQLDB().PingContext(ctx); err != nil {
		t.Errorf("store.SQLDB().PingContext() error = %v", err)
	}

	CloseSQLiteStore(t, store)
}

func TestCloseSQLiteStore(t *testing.T) {
	dsn := SQLiteTestDSN(t, "close_test.db", false)
	store := OpenSQLiteStore(t, dsn)

	// This should succeed without errors
	CloseSQLiteStore(t, store)

	// Verify store is closed by attempting another operation
	// Note: This behavior may vary by driver, but typically
	// operations on closed database return an error
}

func TestOpenSQLiteStore_InvalidDSN(t *testing.T) {
	// Create a mock testing.T that captures fatal calls
	mockT := &mockTestingTB{}

	// Use an invalid DSN that should cause Open to fail
	func() {
		defer func() {
			// Recover from the t.Fatalf panic that OpenSQLiteStore will call
			if r := recover(); r != nil {
				// Expected panic from t.Fatalf
			}
		}()
		OpenSQLiteStore(mockT, "invalid:/path/with/special/chars/that/might/not/work")
	}()

	// The mock testing.TB should have recorded the fatal call
	if !mockT.fatalfCalled {
		t.Error("OpenSQLiteStore() should call t.Fatalf for invalid DSN")
	}
}

// mockTestingTB is a mock implementation of testing.TB for testing failure cases
type mockTestingTB struct {
	testing.TB
	helperCalled bool
	fatalfCalled bool
	fatalfMsg    string
}

func (m *mockTestingTB) Helper() {
	m.helperCalled = true
}

func (m *mockTestingTB) Fatalf(format string, args ...interface{}) {
	m.fatalfCalled = true
	m.fatalfMsg = format
	panic("mock Fatalf called")
}

func (m *mockTestingTB) TempDir() string {
	return "/tmp/mock_test_dir"
}

func (m *mockTestingTB) Cleanup(func()) {}

func TestSQLiteTestDSN_PathHandling(t *testing.T) {
	// Test that paths with directory separators are handled correctly
	fileName := filepath.Join("subdir", "deep", "test.db")
	dsn := SQLiteTestDSN(t, fileName, false)

	// The DSN should contain the file: prefix
	if !strings.HasPrefix(dsn, "file:") {
		t.Errorf("SQLiteTestDSN() path handling failed, got %v", dsn)
	}

	// The DSN should be using forward slashes (URI format)
	// and should not contain backslashes even on Windows
	if strings.Contains(dsn, "\\") {
		t.Errorf("SQLiteTestDSN() should use forward slashes, got %v", dsn)
	}
}

func TestSQLiteStoreConcurrency(t *testing.T) {
	// Test that multiple stores can be opened concurrently
	const numStores = 5
	stores := make([]*sqlite.DB, numStores)

	for i := 0; i < numStores; i++ {
		dsn := SQLiteTestDSN(t, "concurrent_test.db", false)
		stores[i] = OpenSQLiteStore(t, dsn)
	}

	// Verify all stores are functional
	ctx := context.Background()
	for i, store := range stores {
		if err := store.SQLDB().PingContext(ctx); err != nil {
			t.Errorf("store[%d].SQLDB().PingContext() error = %v", i, err)
		}
	}

	// Cleanup all stores
	for _, store := range stores {
		CloseSQLiteStore(t, store)
	}
}