package health

import (
	"encoding/json"
	"net/http"
	"net/http/httptest"
	"testing"
)

func TestHealthHandler(t *testing.T) {
	tests := []struct {
		name           string
		method         string
		expectedStatus int
		expectedBody   HealthResponse
		shouldHaveBody bool
	}{
		{
			name:           "GET request returns 200 OK with status ok",
			method:         http.MethodGet,
			expectedStatus: http.StatusOK,
			expectedBody:   HealthResponse{Status: "ok"},
			shouldHaveBody: true,
		},
		{
			name:           "POST request returns 405 Method Not Allowed",
			method:         http.MethodPost,
			expectedStatus: http.StatusMethodNotAllowed,
			shouldHaveBody: false,
		},
		{
			name:           "PUT request returns 405 Method Not Allowed",
			method:         http.MethodPut,
			expectedStatus: http.StatusMethodNotAllowed,
			shouldHaveBody: false,
		},
		{
			name:           "DELETE request returns 405 Method Not Allowed",
			method:         http.MethodDelete,
			expectedStatus: http.StatusMethodNotAllowed,
			shouldHaveBody: false,
		},
	}

	for _, tt := range tests {
		t.Run(tt.name, func(t *testing.T) {
			req, err := http.NewRequest(tt.method, "/health", nil)
			if err != nil {
				t.Fatal(err)
			}

			rr := httptest.NewRecorder()
			handler := http.HandlerFunc(HealthHandler)

			handler.ServeHTTP(rr, req)

			// Check status code
			if status := rr.Code; status != tt.expectedStatus {
				t.Errorf("handler returned wrong status code: got %v want %v",
					status, tt.expectedStatus)
			}

			if tt.shouldHaveBody {
				// Check content type
				expectedContentType := "application/json"
				if ct := rr.Header().Get("Content-Type"); ct != expectedContentType {
					t.Errorf("handler returned wrong content type: got %v want %v",
						ct, expectedContentType)
				}

				// Check response body
				var response HealthResponse
				if err := json.NewDecoder(rr.Body).Decode(&response); err != nil {
					t.Errorf("failed to decode response body: %v", err)
				}

				if response.Status != tt.expectedBody.Status {
					t.Errorf("handler returned unexpected body: got %v want %v",
						response.Status, tt.expectedBody.Status)
				}
			}
		})
	}
}