//go:build test
// +build test

package notifications

// Package notifications contains tests for admin notification endpoints.
//
// Test Coverage:
//   - GetNotifications: GET /api/admin/notifications - List unacknowledged notifications
//   - AcknowledgeNotification: POST /api/admin/notifications/{id}/acknowledge - Acknowledge a notification
//
// Features tested:
//   - Pagination (page, per_page)
//   - Filtering by reason
//   - Acknowledging notifications (idempotent, not found cases)

import (
	"bytes"
	"context"
	"encoding/json"
	"fmt"
	"net/http"
	"net/http/httptest"
	"os"
	"testing"
	"time"

	"crussell/db"
	"crussell/mw"
	"crussell/testutils/jwt"
	"crussell/testutils/testdb"

	"github.com/go-chi/chi/v5"
	"github.com/jackc/pgx/v5/pgxpool"
)

func TestMain(m *testing.M) {
	pool, _ := testdb.NewPool("")
	testdb.Migrate(&testing.T{}, pool)
	db.DB = pool
	jwt.Init()
	code := m.Run()
	pool.Close()
	os.Exit(code)
}

func resetTestData(t *testing.T) {
	t.Helper()
	testdb.TruncateTables(t, db.DB)
}

// makeAdminRequest creates a request with admin context
func makeAdminRequest(handler http.Handler, method, path string, body interface{}) *httptest.ResponseRecorder {
	return makeRequestWithContext(handler, method, path, body, "admin001", "admin")
}

// makeUserRequest creates a request with regular user context
func makeUserRequest(handler http.Handler, method, path string, body interface{}) *httptest.ResponseRecorder {
	return makeRequestWithContext(handler, method, path, body, "user001", "verified_email")
}

// makeRequestWithContext creates a request with specific user context
func makeRequestWithContext(handler http.Handler, method, path string, body interface{}, userID, role string) *httptest.ResponseRecorder {
	var req *http.Request
	if body != nil {
		bodyBytes, _ := json.Marshal(body)
		req = httptest.NewRequest(method, path, bytes.NewReader(bodyBytes))
		req.Header.Set("Content-Type", "application/json")
	} else {
		req = httptest.NewRequest(method, path, nil)
	}

	// Set up chi routing context for path params
	rctx := chi.NewRouteContext()
	if id, paramName := extractIDFromPath(path); id != "" {
		rctx.URLParams.Add(paramName, id)
	}
	ctx := context.WithValue(req.Context(), chi.RouteCtxKey, rctx)
	ctx = context.WithValue(ctx, mw.UserIDKey, userID)
	ctx = context.WithValue(ctx, mw.UserRoleKey, role)
	req = req.WithContext(ctx)

	w := httptest.NewRecorder()
	handler.ServeHTTP(w, req)
	return w
}

// extractIDFromPath extracts the ID from URL paths
func extractIDFromPath(path string) (string, string) {
	prefix := "/api/admin/notifications/"
	if len(path) > len(prefix) && path[:len(prefix)] == prefix {
		// Extract ID after prefix, up to next / or end
		remainder := path[len(prefix):]
		for i, c := range remainder {
			if c == '/' {
				return remainder[:i], "id"
			}
		}
		return remainder, "id"
	}
	return "", ""
}

// =============================================================================
// GetNotifications Tests
// =============================================================================

// TestNotifications_List tests that an admin can list all unacknowledged notifications
func TestNotifications_List(t *testing.T) {
	resetTestData(t)

	// Create test user for notification reference
	var userID string
	err := db.DB.QueryRow(context.Background(), `
		INSERT INTO users (n_first_name, n_last_name, email, phone, date_of_birth, password_hash, account_role, account_type)
		VALUES ('Test', 'User', 'test@test.com', '+1234567890', '1990-01-01', 'hash', 'verified_email', 'email')
		RETURNING id
	`).Scan(&userID)
	if err != nil {
		t.Fatalf("failed to create user: %v", err)
	}

	// Create a notification
	var notificationID int
	err = db.DB.QueryRow(context.Background(), `
		INSERT INTO admin_notifications (reason, user_id)
		VALUES ('pending_booking', $1)
		RETURNING id
	`, userID).Scan(&notificationID)
	if err != nil {
		t.Fatalf("failed to create notification: %v", err)
	}

	handler := http.HandlerFunc(GetNotifications)
	w := makeAdminRequest(handler, "GET", "/api/admin/notifications", nil)

	if w.Code != http.StatusOK {
		t.Errorf("expected status 200, got %d. body: %s", w.Code, w.Body.String())
	}

	var resp AdminNotificationListResponse
	if err := json.Unmarshal(w.Body.Bytes(), &resp); err != nil {
		t.Fatalf("failed to unmarshal response: %v", err)
	}

	if len(resp.Notifications) != 1 {
		t.Errorf("expected 1 notification, got %d", len(resp.Notifications))
	}

	if len(resp.Notifications) > 0 {
		if resp.Notifications[0].Reason != "pending_booking" {
			t.Errorf("expected reason 'pending_booking', got %s", resp.Notifications[0].Reason)
		}
		if resp.Notifications[0].ID != notificationID {
			t.Errorf("expected notification ID %d, got %d", notificationID, resp.Notifications[0].ID)
		}
	}
}

// TestNotifications_ListEmpty tests that an empty list is returned when no notifications exist
func TestNotifications_ListEmpty(t *testing.T) {
	resetTestData(t)

	handler := http.HandlerFunc(GetNotifications)
	w := makeAdminRequest(handler, "GET", "/api/admin/notifications", nil)

	if w.Code != http.StatusOK {
		t.Errorf("expected status 200, got %d", w.Code)
	}

	var resp AdminNotificationListResponse
	if err := json.Unmarshal(w.Body.Bytes(), &resp); err != nil {
		t.Fatalf("failed to unmarshal response: %v", err)
	}

	if len(resp.Notifications) != 0 {
		t.Errorf("expected 0 notifications, got %d", len(resp.Notifications))
	}

	// Total should be 0
	if resp.Total != 0 {
		t.Errorf("expected total 0, got %d", resp.Total)
	}
}

// TestNotifications_ListFilterByReason tests that notifications can be filtered by reason
func TestNotifications_ListFilterByReason(t *testing.T) {
	resetTestData(t)

	// Create test user
	var userID string
	err := db.DB.QueryRow(context.Background(), `
		INSERT INTO users (n_first_name, n_last_name, email, phone, date_of_birth, password_hash, account_role, account_type)
		VALUES ('Test', 'User', 'test@test.com', '+1234567890', '1990-01-01', 'hash', 'verified_email', 'email')
		RETURNING id
	`).Scan(&userID)
	if err != nil {
		t.Fatalf("failed to create user: %v", err)
	}

	// Create notifications with different reasons
	reasons := []string{"pending_booking", "cancelled_booking", "edit_requested"}
	for _, reason := range reasons {
		_, err := db.DB.Exec(context.Background(), `
			INSERT INTO admin_notifications (reason, user_id)
			VALUES ($1, $2)
		`, reason, userID)
		if err != nil {
			t.Fatalf("failed to create notification: %v", err)
		}
	}

	handler := http.HandlerFunc(GetNotifications)

	// Filter by pending_booking
	w := makeAdminRequest(handler, "GET", "/api/admin/notifications?reason=pending_booking", nil)

	if w.Code != http.StatusOK {
		t.Errorf("expected status 200, got %d", w.Code)
	}

	var resp AdminNotificationListResponse
	if err := json.Unmarshal(w.Body.Bytes(), &resp); err != nil {
		t.Fatalf("failed to unmarshal response: %v", err)
	}

	if len(resp.Notifications) != 1 {
		t.Errorf("expected 1 notification with reason=pending_booking, got %d", len(resp.Notifications))
	}

	if len(resp.Notifications) > 0 && resp.Notifications[0].Reason != "pending_booking" {
		t.Errorf("expected reason 'pending_booking', got %s", resp.Notifications[0].Reason)
	}
}

// TestNotifications_ListPagination tests that pagination works correctly
func TestNotifications_ListPagination(t *testing.T) {
	resetTestData(t)

	// Create test user
	var userID string
	err := db.DB.QueryRow(context.Background(), `
		INSERT INTO users (n_first_name, n_last_name, email, phone, date_of_birth, password_hash, account_role, account_type)
		VALUES ('Test', 'User', 'test@test.com', '+1234567890', '1990-01-01', 'hash', 'verified_email', 'email')
		RETURNING id
	`).Scan(&userID)
	if err != nil {
		t.Fatalf("failed to create user: %v", err)
	}

	// Create 25 notifications
	for i := 0; i < 25; i++ {
		_, err := db.DB.Exec(context.Background(), `
			INSERT INTO admin_notifications (reason, user_id)
			VALUES ('pending_booking', $1)
		`, userID)
		if err != nil {
			t.Fatalf("failed to create notification: %v", err)
		}
	}

	handler := http.HandlerFunc(GetNotifications)

	// Get first page (default 20 items)
	w := makeAdminRequest(handler, "GET", "/api/admin/notifications?page=1&per_page=10", nil)

	if w.Code != http.StatusOK {
		t.Errorf("expected status 200, got %d", w.Code)
	}

	var resp AdminNotificationListResponse
	if err := json.Unmarshal(w.Body.Bytes(), &resp); err != nil {
		t.Fatalf("failed to unmarshal response: %v", err)
	}

	if len(resp.Notifications) != 10 {
		t.Errorf("expected 10 notifications on page 1, got %d", len(resp.Notifications))
	}

	if resp.Total != 25 {
		t.Errorf("expected total 25, got %d", resp.Total)
	}

	if resp.Page != 1 {
		t.Errorf("expected page 1, got %d", resp.Page)
	}

	if resp.PerPage != 10 {
		t.Errorf("expected per_page 10, got %d", resp.PerPage)
	}
}

// TestNotifications_ListExcludesAcknowledged tests that acknowledged notifications are not returned
func TestNotifications_ListExcludesAcknowledged(t *testing.T) {
	resetTestData(t)

	// Create test user
	var userID string
	err := db.DB.QueryRow(context.Background(), `
		INSERT INTO users (n_first_name, n_last_name, email, phone, date_of_birth, password_hash, account_role, account_type)
		VALUES ('Test', 'User', 'test@test.com', '+1234567890', '1990-01-01', 'hash', 'verified_email', 'email')
		RETURNING id
	`).Scan(&userID)
	if err != nil {
		t.Fatalf("failed to create user: %v", err)
	}

	// Create acknowledged notification
	_, err = db.DB.Exec(context.Background(), `
		INSERT INTO admin_notifications (reason, user_id, acknowledged_at)
		VALUES ('pending_booking', $1, NOW())
	`, userID)
	if err != nil {
		t.Fatalf("failed to create acknowledged notification: %v", err)
	}

	// Create unacknowledged notification
	var unackID int
	err = db.DB.QueryRow(context.Background(), `
		INSERT INTO admin_notifications (reason, user_id)
		VALUES ('cancelled_booking', $1)
		RETURNING id
	`, userID).Scan(&unackID)
	if err != nil {
		t.Fatalf("failed to create unacknowledged notification: %v", err)
	}

	handler := http.HandlerFunc(GetNotifications)
	w := makeAdminRequest(handler, "GET", "/api/admin/notifications", nil)

	if w.Code != http.StatusOK {
		t.Errorf("expected status 200, got %d", w.Code)
	}

	var resp AdminNotificationListResponse
	if err := json.Unmarshal(w.Body.Bytes(), &resp); err != nil {
		t.Fatalf("failed to unmarshal response: %v", err)
	}

	// Should only return the unacknowledged notification
	if len(resp.Notifications) != 1 {
		t.Errorf("expected 1 unacknowledged notification, got %d", len(resp.Notifications))
	}

	if len(resp.Notifications) > 0 && resp.Notifications[0].ID != unackID {
		t.Errorf("expected unacknowledged notification ID %d, got %d", unackID, resp.Notifications[0].ID)
	}
}

// =============================================================================
// AcknowledgeNotification Tests
// =============================================================================

// TestNotifications_Acknowledge tests that an admin can acknowledge a notification
func TestNotifications_Acknowledge(t *testing.T) {
	resetTestData(t)

	// Create test user
	var userID string
	err := db.DB.QueryRow(context.Background(), `
		INSERT INTO users (n_first_name, n_last_name, email, phone, date_of_birth, password_hash, account_role, account_type)
		VALUES ('Test', 'User', 'test@test.com', '+1234567890', '1990-01-01', 'hash', 'verified_email', 'email')
		RETURNING id
	`).Scan(&userID)
	if err != nil {
		t.Fatalf("failed to create user: %v", err)
	}

	// Create notification
	var notificationID int
	err = db.DB.QueryRow(context.Background(), `
		INSERT INTO admin_notifications (reason, user_id)
		VALUES ('pending_booking', $1)
		RETURNING id
	`, userID).Scan(&notificationID)
	if err != nil {
		t.Fatalf("failed to create notification: %v", err)
	}

	handler := http.HandlerFunc(AcknowledgeNotification)
	w := makeAdminRequest(handler, "POST", fmt.Sprintf("/api/admin/notifications/%d/acknowledge", notificationID), nil)

	if w.Code != http.StatusOK {
		t.Errorf("expected status 200, got %d. body: %s", w.Code, w.Body.String())
	}

	// Verify the notification is acknowledged
	var acknowledgedAt *time.Time
	err = db.DB.QueryRow(context.Background(), `
		SELECT acknowledged_at FROM admin_notifications WHERE id = $1
	`, notificationID).Scan(&acknowledgedAt)
	if err != nil {
		t.Fatalf("failed to query notification: %v", err)
	}

	if acknowledgedAt == nil {
		t.Error("expected acknowledged_at to be set, got nil")
	}
}

// TestNotifications_AcknowledgeNotFound tests that acknowledging a non-existent notification returns 404
func TestNotifications_AcknowledgeNotFound(t *testing.T) {
	resetTestData(t)

	handler := http.HandlerFunc(AcknowledgeNotification)
	w := makeAdminRequest(handler, "POST", "/api/admin/notifications/99999/acknowledge", nil)

	if w.Code != http.StatusNotFound {
		t.Errorf("expected status 404 for non-existent notification, got %d", w.Code)
	}
}

// TestNotifications_AcknowledgeAlreadyAcknowledged tests that acknowledging an already-acknowledged notification returns 404
func TestNotifications_AcknowledgeAlreadyAcknowledged(t *testing.T) {
	resetTestData(t)

	// Create test user
	var userID string
	err := db.DB.QueryRow(context.Background(), `
		INSERT INTO users (n_first_name, n_last_name, email, phone, date_of_birth, password_hash, account_role, account_type)
		VALUES ('Test', 'User', 'test@test.com', '+1234567890', '1990-01-01', 'hash', 'verified_email', 'email')
		RETURNING id
	`).Scan(&userID)
	if err != nil {
		t.Fatalf("failed to create user: %v", err)
	}

	// Create already-acknowledged notification
	var notificationID int
	err = db.DB.QueryRow(context.Background(), `
		INSERT INTO admin_notifications (reason, user_id, acknowledged_at)
		VALUES ('pending_booking', $1, NOW())
		RETURNING id
	`, userID).Scan(&notificationID)
	if err != nil {
		t.Fatalf("failed to create notification: %v", err)
	}

	handler := http.HandlerFunc(AcknowledgeNotification)
	w := makeAdminRequest(handler, "POST", fmt.Sprintf("/api/admin/notifications/%d/acknowledge", notificationID), nil)

	if w.Code != http.StatusNotFound {
		t.Errorf("expected status 404 for already acknowledged notification, got %d", w.Code)
	}
}

// TestNotifications_AcknowledgeInvalidID tests that invalid notification IDs are handled
func TestNotifications_AcknowledgeInvalidID(t *testing.T) {
	resetTestData(t)

	handler := http.HandlerFunc(AcknowledgeNotification)

	tests := []struct {
		name        string
		id          string
		expectCode  int
	}{
		{"non_numeric_id", "abc", http.StatusBadRequest}, // Invalid format
		{"negative_id", "-1", http.StatusNotFound},     // Valid int, not found
		{"zero_id", "0", http.StatusNotFound},           // Valid int, not found
	}

	for _, tt := range tests {
		t.Run(tt.name, func(t *testing.T) {
			// Create a custom request to test invalid ID handling
			req := httptest.NewRequest("POST", "/api/admin/notifications/"+tt.id+"/acknowledge", nil)

			// Set up chi routing context with the invalid ID
			rctx := chi.NewRouteContext()
			rctx.URLParams.Add("id", tt.id)
			ctx := context.WithValue(req.Context(), chi.RouteCtxKey, rctx)
			ctx = context.WithValue(ctx, mw.UserIDKey, "admin001")
			ctx = context.WithValue(ctx, mw.UserRoleKey, "admin")
			req = req.WithContext(ctx)

			w := httptest.NewRecorder()
			handler.ServeHTTP(w, req)

			if w.Code != tt.expectCode {
				t.Errorf("expected status %d for ID '%s', got %d", tt.expectCode, tt.id, w.Code)
			}
		})
	}
}

// TestNotifications_AcknowledgeMissingID tests that missing ID returns 400
func TestNotifications_AcknowledgeMissingID(t *testing.T) {
	resetTestData(t)

	// Create a custom request with no ID in path
	req := httptest.NewRequest("POST", "/api/admin/notifications//acknowledge", nil)

	// Set up chi routing context without ID
	rctx := chi.NewRouteContext()
	ctx := context.WithValue(req.Context(), chi.RouteCtxKey, rctx)
	ctx = context.WithValue(ctx, mw.UserIDKey, "admin001")
	ctx = context.WithValue(ctx, mw.UserRoleKey, "admin")
	req = req.WithContext(ctx)

	w := httptest.NewRecorder()
	handler := http.HandlerFunc(AcknowledgeNotification)
	handler.ServeHTTP(w, req)

	// Should return 400 for missing ID
	if w.Code != http.StatusBadRequest {
		t.Errorf("expected status 400 for missing ID, got %d", w.Code)
	}
}

// =============================================================================
// Notification with Booking Reference Tests
// =============================================================================

// TestNotifications_WithBookingReference tests that notifications include booking_id when applicable
func TestNotifications_WithBookingReference(t *testing.T) {
	resetTestData(t)

	// Create test user
	var userID string
	err := db.DB.QueryRow(context.Background(), `
		INSERT INTO users (n_first_name, n_last_name, email, phone, date_of_birth, password_hash, account_role, account_type)
		VALUES ('Test', 'User', 'test@test.com', '+1234567890', '1990-01-01', 'hash', 'verified_email', 'email')
		RETURNING id
	`).Scan(&userID)
	if err != nil {
		t.Fatalf("failed to create user: %v", err)
	}

	// Create a service
	var serviceID string
	err = db.DB.QueryRow(context.Background(), `
		INSERT INTO services (name, description, price, duration_minutes, is_active)
		VALUES ('Manicure', 'Test service', 25.00, 30, true)
		RETURNING id
	`).Scan(&serviceID)
	if err != nil {
		t.Fatalf("failed to create service: %v", err)
	}

	// Create a booking
	var bookingID string
	err = db.DB.QueryRow(context.Background(), `
		INSERT INTO bookings (user_id, start_time, status)
		VALUES ($1, NOW() + INTERVAL '1 day', 'pending')
		RETURNING id
	`, userID).Scan(&bookingID)
	if err != nil {
		t.Fatalf("failed to create booking: %v", err)
	}

	// Create notification with booking reference
	var notificationID int
	err = db.DB.QueryRow(context.Background(), `
		INSERT INTO admin_notifications (reason, booking_id, user_id)
		VALUES ('pending_booking', $1, $2)
		RETURNING id
	`, bookingID, userID).Scan(&notificationID)
	if err != nil {
		t.Fatalf("failed to create notification: %v", err)
	}

	handler := http.HandlerFunc(GetNotifications)
	w := makeAdminRequest(handler, "GET", "/api/admin/notifications", nil)

	if w.Code != http.StatusOK {
		t.Errorf("expected status 200, got %d", w.Code)
	}

	var resp AdminNotificationListResponse
	if err := json.Unmarshal(w.Body.Bytes(), &resp); err != nil {
		t.Fatalf("failed to unmarshal response: %v", err)
	}

	if len(resp.Notifications) != 1 {
		t.Fatalf("expected 1 notification, got %d", len(resp.Notifications))
	}

	// Note: booking_id in DB is stored as bigint, but our struct uses int
	// The booking_id should be present
	if resp.Notifications[0].BookingID == nil {
		t.Error("expected booking_id to be set, got nil")
	}
}

// Ensure test compilation - import pgxpool to avoid unused import
var _ = func() *pgxpool.Pool { return nil }