package handlers_test

import (
	"net/http"
	"net/http/httptest"
	"testing"

	"github.com/stretchr/testify/assert"
)

// TestRenderTemplateBuffersOutput verifies that successful template rendering
// produces a complete HTML response (not partial/corrupt).
func TestRenderTemplateBuffersOutput(t *testing.T) {
	t.Parallel()

	testCtx := setupTestHandlers(t)

	// The setup page is simple and has no DB dependencies
	request := httptest.NewRequest(http.MethodGet, "/setup", nil)
	recorder := httptest.NewRecorder()

	handler := testCtx.handlers.HandleSetupGET()
	handler.ServeHTTP(recorder, request)

	assert.Equal(t, http.StatusOK, recorder.Code)

	body := recorder.Body.String()
	// A properly buffered response should contain the closing </html> tag,
	// proving the full template was rendered before being sent.
	assert.Contains(t, body, "</html>")
	// Should NOT contain the error text that would be appended on failure
	assert.NotContains(t, body, "Internal Server Error")
}

// TestDashboardRenderTemplateBuffersOutput verifies the dashboard handler
// also uses buffered template rendering.
func TestDashboardRenderTemplateBuffersOutput(t *testing.T) {
	t.Parallel()

	testCtx := setupTestHandlers(t)

	request := httptest.NewRequest(http.MethodGet, "/", nil)
	recorder := httptest.NewRecorder()

	handler := testCtx.handlers.HandleDashboard()
	handler.ServeHTTP(recorder, request)

	assert.Equal(t, http.StatusOK, recorder.Code)

	body := recorder.Body.String()
	assert.Contains(t, body, "</html>")
	assert.NotContains(t, body, "Internal Server Error")
}

// TestLoginRenderTemplateBuffersOutput verifies the login handler
// uses buffered template rendering.
func TestLoginRenderTemplateBuffersOutput(t *testing.T) {
	t.Parallel()

	testCtx := setupTestHandlers(t)

	request := httptest.NewRequest(http.MethodGet, "/login", nil)
	recorder := httptest.NewRecorder()

	handler := testCtx.handlers.HandleLoginGET()
	handler.ServeHTTP(recorder, request)

	assert.Equal(t, http.StatusOK, recorder.Code)

	body := recorder.Body.String()
	assert.Contains(t, body, "</html>")
	assert.NotContains(t, body, "Internal Server Error")
}