package handlers

import (
	"context"
	"html/template"
	"net/http"
	"net/http/httptest"
	"net/url"
	"strings"
	"testing"

	"custom-start-page/internal/middleware"
)

// createMockPageTemplate creates a simple mock template for testing
func createMockPageTemplate() *template.Template {
	tmpl := template.New("base")
	
	// Define page-tabs template
	template.Must(tmpl.New("page-tabs.html").Parse(`{{define "page-tabs.html"}}{{range .Pages}}<button>{{.Name}}</button>{{end}}{{end}}`))
	
	// Define widget-grid template
	template.Must(tmpl.New("widget-grid.html").Parse(`{{define "widget-grid.html"}}<div>Widgets for page {{.PageID}}</div>{{end}}`))
	
	// Define page-tab template
	template.Must(tmpl.New("page-tab.html").Parse(`{{define "page-tab.html"}}<button>{{.Page.Name}}</button>{{end}}`))
	
	return tmpl
}

// TestHandleGetPage tests retrieving a page's widget grid
func TestHandleGetPage(t *testing.T) {
	// Setup
	mockTemplate := createMockPageTemplate()
	mockService := &mockPageService{}
	
	handler := &PageHandler{
		pageService: mockService,
		templates:   mockTemplate,
	}

	// Create request with user ID in context
	req := httptest.NewRequest(http.MethodGet, "/pages/page-1", nil)
	req.SetPathValue("id", "page-1")
	ctx := context.WithValue(req.Context(), middleware.GetUserIDContextKey(), "test-user-123")
	req = req.WithContext(ctx)
	w := httptest.NewRecorder()

	// Execute
	handler.HandleGetPage(w, req)

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

	body := w.Body.String()
	if !strings.Contains(body, "page-1") {
		t.Errorf("Expected response to contain page ID, got: %s", body)
	}
}

// TestHandleCreatePage tests creating a new page
func TestHandleCreatePage(t *testing.T) {
	// Setup
	mockTemplate := createMockPageTemplate()
	mockService := &mockPageService{}
	
	handler := &PageHandler{
		pageService: mockService,
		templates:   mockTemplate,
	}

	// Create form data
	form := url.Values{}
	form.Add("name", "New Page")
	
	// Create request with user ID in context
	req := httptest.NewRequest(http.MethodPost, "/pages", strings.NewReader(form.Encode()))
	req.Header.Set("Content-Type", "application/x-www-form-urlencoded")
	ctx := context.WithValue(req.Context(), middleware.GetUserIDContextKey(), "test-user-123")
	req = req.WithContext(ctx)
	w := httptest.NewRecorder()

	// Execute
	handler.HandleCreatePage(w, req)

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

	// Verify page was created
	if len(mockService.pages) != 1 {
		t.Errorf("Expected 1 page to be created, got %d", len(mockService.pages))
	}
	
	if mockService.pages[0].Name != "New Page" {
		t.Errorf("Expected page name 'New Page', got '%s'", mockService.pages[0].Name)
	}
}

// TestHandleCreatePage_InvalidName tests creating a page with invalid name
func TestHandleCreatePage_InvalidName(t *testing.T) {
	// Setup
	mockTemplate := createMockPageTemplate()
	mockService := &mockPageService{}
	
	handler := &PageHandler{
		pageService: mockService,
		templates:   mockTemplate,
	}

	// Test empty name
	form := url.Values{}
	form.Add("name", "")
	
	req := httptest.NewRequest(http.MethodPost, "/pages", strings.NewReader(form.Encode()))
	req.Header.Set("Content-Type", "application/x-www-form-urlencoded")
	ctx := context.WithValue(req.Context(), middleware.GetUserIDContextKey(), "test-user-123")
	req = req.WithContext(ctx)
	w := httptest.NewRecorder()

	handler.HandleCreatePage(w, req)

	if w.Code != http.StatusBadRequest {
		t.Errorf("Expected status 400 for empty name, got %d", w.Code)
	}

	// Test name too long
	form = url.Values{}
	form.Add("name", strings.Repeat("a", 51))
	
	req = httptest.NewRequest(http.MethodPost, "/pages", strings.NewReader(form.Encode()))
	req.Header.Set("Content-Type", "application/x-www-form-urlencoded")
	ctx = context.WithValue(req.Context(), middleware.GetUserIDContextKey(), "test-user-123")
	req = req.WithContext(ctx)
	w = httptest.NewRecorder()

	handler.HandleCreatePage(w, req)

	if w.Code != http.StatusBadRequest {
		t.Errorf("Expected status 400 for name too long, got %d", w.Code)
	}
}

// TestHandleUpdatePage tests updating a page
func TestHandleUpdatePage(t *testing.T) {
	// Setup
	mockTemplate := createMockPageTemplate()
	mockService := &mockPageService{}
	
	// Create initial page
	_, _ = mockService.CreatePage(context.Background(), "test-user-123", "Old Name")
	
	handler := &PageHandler{
		pageService: mockService,
		templates:   mockTemplate,
	}

	// Create form data
	form := url.Values{}
	form.Add("name", "Updated Name")
	
	// Create request with user ID in context
	req := httptest.NewRequest(http.MethodPut, "/pages/new-page-id", strings.NewReader(form.Encode()))
	req.Header.Set("Content-Type", "application/x-www-form-urlencoded")
	req.SetPathValue("id", "new-page-id")
	ctx := context.WithValue(req.Context(), middleware.GetUserIDContextKey(), "test-user-123")
	req = req.WithContext(ctx)
	w := httptest.NewRecorder()

	// Execute
	handler.HandleUpdatePage(w, req)

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

	// Verify page was updated
	if mockService.pages[0].Name != "Updated Name" {
		t.Errorf("Expected page name 'Updated Name', got '%s'", mockService.pages[0].Name)
	}
}

// TestHandleDeletePage tests deleting a page
func TestHandleDeletePage(t *testing.T) {
	// Setup
	mockTemplate := createMockPageTemplate()
	mockService := &mockPageService{}
	
	// Create two pages
	_, _ = mockService.CreatePage(context.Background(), "test-user-123", "Page 1")
	_, _ = mockService.CreatePage(context.Background(), "test-user-123", "Page 2")
	
	handler := &PageHandler{
		pageService: mockService,
		templates:   mockTemplate,
	}

	// Create request with user ID in context
	req := httptest.NewRequest(http.MethodDelete, "/pages/page-1", nil)
	req.SetPathValue("id", "page-1")
	ctx := context.WithValue(req.Context(), middleware.GetUserIDContextKey(), "test-user-123")
	req = req.WithContext(ctx)
	w := httptest.NewRecorder()

	// Execute
	handler.HandleDeletePage(w, req)

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

// TestHandleReorderPages tests reordering pages
func TestHandleReorderPages(t *testing.T) {
	// Setup
	mockTemplate := createMockPageTemplate()
	mockService := &mockPageService{}
	
	// Create pages
	_, _ = mockService.CreatePage(context.Background(), "test-user-123", "Page 1")
	_, _ = mockService.CreatePage(context.Background(), "test-user-123", "Page 2")
	
	handler := &PageHandler{
		pageService: mockService,
		templates:   mockTemplate,
	}

	// Create form data with JSON array
	form := url.Values{}
	form.Add("order", `["page-2", "page-1"]`)
	
	// Create request with user ID in context
	req := httptest.NewRequest(http.MethodPost, "/pages/reorder", strings.NewReader(form.Encode()))
	req.Header.Set("Content-Type", "application/x-www-form-urlencoded")
	ctx := context.WithValue(req.Context(), middleware.GetUserIDContextKey(), "test-user-123")
	req = req.WithContext(ctx)
	w := httptest.NewRecorder()

	// Execute
	handler.HandleReorderPages(w, req)

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