package server_test

import (
	"bytes"
	"context" // Added for mock provider
	"encoding/json"
	"errors"
	"net/http"
	"net/http/httptest"
	"testing"

	"git.cloonar.com/cloonar/updns/internal/config" // Added for mock provider
	"git.cloonar.com/cloonar/updns/internal/server"
	"go.uber.org/zap" // Added for logger
)

// mockProvider is a simple mock for testing router logic without real provider interaction.
type mockProvider struct {
	updateErr error // Allows simulating update errors
}

func (m *mockProvider) UpdateRecord(ctx context.Context, host, ip string) error {
	return m.updateErr
}

func newTestConfig(provider string) *config.Config {
	return &config.Config{
		Server: config.ServerConfig{
			BindAddress: ":0",
			TLS:         config.TLSConfig{Enabled: false},
		},
		Upstream: config.UpstreamConfig{
			Provider: provider,
			Hetzner:  config.HetznerConfig{APIToken: "token"},
		},
		Clients: map[string]config.ClientConfig{
			"client1": {
				Secret:   "s3cr3t",
				Exact:    []string{"a.example.com"},
				Wildcard: []string{"example.net"},
			},
		},
	}
}

func TestMetricsEndpoint(t *testing.T) {
	logger := zap.NewNop()
	mockProv := &mockProvider{}
	r := server.NewRouter(newTestConfig("unknown"), logger, mockProv)
	req := httptest.NewRequest("GET", "/metrics", nil)
	w := httptest.NewRecorder()
	r.ServeHTTP(w, req)
	if w.Code != http.StatusOK {
		t.Fatalf("expected 200 OK, got %d", w.Code)
	}
}

func TestUpdateInvalidJSON(t *testing.T) {
	logger := zap.NewNop()
	mockProv := &mockProvider{}
	r := server.NewRouter(newTestConfig("unknown"), logger, mockProv)
	req := httptest.NewRequest("POST", "/update", bytes.NewBufferString("{invalid"))
	req.Header.Set("Content-Type", "application/json")
	w := httptest.NewRecorder()
	r.ServeHTTP(w, req)
	if w.Code != http.StatusBadRequest {
		t.Errorf("expected 400 BadRequest, got %d", w.Code)
	}
}

func TestUpdateUnauthorizedKey(t *testing.T) {
	logger := zap.NewNop()
	mockProv := &mockProvider{}
	r := server.NewRouter(newTestConfig("unknown"), logger, mockProv)
	body := map[string]string{"key": "bad", "secret": "x", "host": "a.example.com"}
	data, _ := json.Marshal(body)
	req := httptest.NewRequest("POST", "/update", bytes.NewBuffer(data))
	req.Header.Set("Content-Type", "application/json")
	w := httptest.NewRecorder()
	r.ServeHTTP(w, req)
	if w.Code != http.StatusUnauthorized {
		t.Errorf("expected 401 Unauthorized, got %d", w.Code)
	}
}

func TestUpdateHostForbidden(t *testing.T) {
	logger := zap.NewNop()
	mockProv := &mockProvider{}
	r := server.NewRouter(newTestConfig("unknown"), logger, mockProv)
	body := map[string]string{"key": "client1", "secret": "s3cr3t", "host": "bad.example.com"}
	data, _ := json.Marshal(body)
	req := httptest.NewRequest("POST", "/update", bytes.NewBuffer(data))
	req.Header.Set("Content-Type", "application/json")
	w := httptest.NewRecorder()
	r.ServeHTTP(w, req)
	if w.Code != http.StatusForbidden {
		t.Errorf("expected 403 Forbidden, got %d", w.Code)
	}
}

// Note: This test case name is slightly misleading now. The router itself doesn't care
// about the provider name from config anymore, as the provider is passed in.
// The provider initialization logic is tested separately or in StartServer tests.
// We keep the test to ensure the update path works correctly when auth passes.
// If the *mock* provider returned an error, we'd get 500.
func TestUpdateProviderInteraction(t *testing.T) {
	logger := zap.NewNop()
	// Simulate a provider error
	mockProv := &mockProvider{updateErr: errors.New("simulated provider update error")}
	r := server.NewRouter(newTestConfig("hetzner"), logger, mockProv) // Config provider name doesn't matter here
	body := map[string]string{"key": "client1", "secret": "s3cr3t", "host": "a.example.com"}
	data, _ := json.Marshal(body)
	req := httptest.NewRequest("POST", "/update", bytes.NewBuffer(data))
	req.Header.Set("Content-Type", "application/json")
	w := httptest.NewRecorder()
	r.ServeHTTP(w, req)
	if w.Code != http.StatusInternalServerError {
		t.Errorf("expected 500 InternalServerError, got %d", w.Code)
	}
}

func TestUpdateSuccess(t *testing.T) {
	logger := zap.NewNop()
	mockProv := &mockProvider{} // No error for success case
	r := server.NewRouter(newTestConfig("hetzner"), logger, mockProv)
	body := map[string]string{"key": "client1", "secret": "s3cr3t", "host": "a.example.com", "ip": "1.2.3.4"}
	data, _ := json.Marshal(body)
	req := httptest.NewRequest("POST", "/update", bytes.NewBuffer(data))
	req.Header.Set("Content-Type", "application/json")
	w := httptest.NewRecorder()
	r.ServeHTTP(w, req)
	if w.Code != http.StatusOK {
		t.Errorf("expected 200 OK, got %d", w.Code)
	}
}