package externaladmin

import (
	"errors"
	"net/http"
	"net/http/httptest"
	"os"
	"strings"
	"testing"

	adminmiddleware "hyapp-admin-server/internal/middleware"

	"github.com/DATA-DOG/go-sqlmock"
	"github.com/gin-gonic/gin"
	"gorm.io/driver/mysql"
	"gorm.io/gorm"
)

func TestCreateAccountRejectsUsernameAlreadyUsedByAnotherApp(t *testing.T) {
	adminSQL, adminMock, err := sqlmock.New()
	if err != nil {
		t.Fatalf("create admin sql mock: %v", err)
	}
	defer adminSQL.Close()
	adminDB, err := gorm.Open(mysql.New(mysql.Config{Conn: adminSQL, SkipInitializeWithVersion: true}), &gorm.Config{})
	if err != nil {
		t.Fatalf("create admin gorm: %v", err)
	}
	userDB, userMock, err := sqlmock.New()
	if err != nil {
		t.Fatalf("create user sql mock: %v", err)
	}
	defer userDB.Close()

	// The check intentionally has no app_code predicate. It avoids owner-DB and
	// bcrypt work for an obvious conflict; migration 100's unique index closes the
	// concurrent-create race after this advisory check.
	adminMock.ExpectQuery("SELECT `id` FROM `external_admin_accounts` WHERE username = \\? LIMIT \\?").
		WithArgs("shared-operator", 1).
		WillReturnRows(sqlmock.NewRows([]string{"id"}).AddRow(9))
	service := NewService(adminDB, userDB, Config{})
	_, err = service.CreateAccount(t.Context(), CreateInput{
		AppCode: "lalu", TargetUserID: "8888", Username: "Shared-Operator",
		Password: "temporary-password", CreatedByAdminID: 1,
	})
	if !errors.Is(err, ErrAccountConflict) {
		t.Fatalf("create error = %v, want global username conflict", err)
	}
	if err := adminMock.ExpectationsWereMet(); err != nil {
		t.Fatalf("admin sql expectations: %v", err)
	}
	if err := userMock.ExpectationsWereMet(); err != nil {
		t.Fatalf("user DB must not be queried after global conflict: %v", err)
	}
}

func TestLoginIgnoresLegacyRequestAppAndAuditsUnknownAccountWithoutTenant(t *testing.T) {
	adminSQL, adminMock, err := sqlmock.New()
	if err != nil {
		t.Fatalf("create admin sql mock: %v", err)
	}
	defer adminSQL.Close()
	adminDB, err := gorm.Open(mysql.New(mysql.Config{Conn: adminSQL, SkipInitializeWithVersion: true}), &gorm.Config{})
	if err != nil {
		t.Fatalf("create admin gorm: %v", err)
	}

	adminMock.ExpectQuery("SELECT `id`,`app_code` FROM `external_admin_accounts` WHERE username = \\? LIMIT \\?").
		WithArgs("missing-operator", 1).
		WillReturnRows(sqlmock.NewRows([]string{"id", "app_code"}))
	// Unknown names use an empty app_code sentinel. The legacy request value "lalu"
	// must not be copied into security audit data or used to select a tenant.
	adminMock.ExpectBegin()
	adminMock.ExpectExec("INSERT INTO `external_admin_login_logs`").
		WithArgs(nil, "", "missing-operator", "192.0.2.10", "", "failed", "invalid_credentials", sqlmock.AnyArg()).
		WillReturnResult(sqlmock.NewResult(1, 1))
	adminMock.ExpectCommit()

	gin.SetMode(gin.TestMode)
	engine := gin.New()
	// Production installs the global App middleware before external routes. Login
	// must remove its fallback "lalu" response header until credentials resolve.
	engine.Use(adminmiddleware.AppCode())
	handler := New(adminDB, nil, Config{}, nil, WithLoginRateLimiter(allowFixedWindowLimiter{}))
	RegisterExternalRoutes(engine.Group("/api/v1"), handler, BusinessHandlers{})
	request := httptest.NewRequest(http.MethodPost, "/api/v1/external/auth/login", strings.NewReader(`{"appCode":"lalu","account":"missing-operator","password":"wrong-password"}`))
	request.Header.Set("Content-Type", "application/json")
	request.RemoteAddr = "192.0.2.10:12345"
	responseRecorder := httptest.NewRecorder()
	engine.ServeHTTP(responseRecorder, request)
	if responseRecorder.Code != http.StatusUnauthorized {
		t.Fatalf("status=%d body=%s", responseRecorder.Code, responseRecorder.Body.String())
	}
	if got := responseRecorder.Header().Get("X-App-Code"); got != "" {
		t.Fatalf("failed tenant-less login exposed default App header %q", got)
	}
	if !strings.Contains(responseRecorder.Body.String(), `"code":40100`) || strings.Contains(responseRecorder.Body.String(), "App") {
		t.Fatalf("login response must expose only stable auth code and generic text: %s", responseRecorder.Body.String())
	}
	if err := adminMock.ExpectationsWereMet(); err != nil {
		t.Fatalf("admin sql expectations: %v", err)
	}
}

func TestGlobalUsernameMigrationIsOnlineAndFailClosed(t *testing.T) {
	body, err := os.ReadFile("../../../migrations/100_external_admin_global_username.sql")
	if err != nil {
		t.Fatalf("read migration 100: %v", err)
	}
	sqlText := string(body)
	for _, token := range []string{
		"ADD UNIQUE KEY uk_external_admin_accounts_username (username)",
		"DROP INDEX uk_external_admin_accounts_app_username",
		"ALGORITHM=INPLACE", "LOCK=NONE",
	} {
		if !strings.Contains(sqlText, token) {
			t.Fatalf("migration 100 missing %q", token)
		}
	}
	if strings.Contains(strings.ToUpper(sqlText), "UPDATE EXTERNAL_ADMIN_ACCOUNTS") || strings.Contains(strings.ToUpper(sqlText), "DELETE FROM EXTERNAL_ADMIN_ACCOUNTS") {
		t.Fatal("migration must not silently rename or delete duplicate credentials")
	}
}