package discord

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

	"mixmaker/backend/internal/domain"
)

func TestAnnounceEventCreated(t *testing.T) {
	var received messagePayload
	server := httptest.NewServer(http.HandlerFunc(func(response http.ResponseWriter, request *http.Request) {
		if request.Method != http.MethodPost || request.URL.Path != "/channels/channel-123/messages" {
			t.Errorf("unexpected request: %s %s", request.Method, request.URL.Path)
		}
		if authorization := request.Header.Get("Authorization"); authorization != "Bot secret-token" {
			t.Errorf("unexpected Authorization header: %q", authorization)
		}
		if err := json.NewDecoder(request.Body).Decode(&received); err != nil {
			t.Errorf("decode payload: %v", err)
		}
		response.WriteHeader(http.StatusCreated)
	}))
	defer server.Close()

	announcer, err := New(Config{
		BotToken:   "secret-token",
		ChannelID:  "channel-123",
		PublicURL:  "https://mix.example.com",
		Locale:     "ru",
		APIBaseURL: server.URL,
		HTTPClient: server.Client(),
	})
	if err != nil {
		t.Fatal(err)
	}
	start := time.Date(2026, time.July, 20, 18, 0, 0, 0, time.UTC)
	event := domain.Event{
		ID:                   "event-456",
		Name:                 "Воскресный микс",
		Description:          "Собираемся на Bo3",
		StartsAt:             start,
		RegistrationDeadline: start.Add(-2 * time.Hour),
	}

	if err := announcer.AnnounceEventCreated(context.Background(), event); err != nil {
		t.Fatal(err)
	}
	if received.Content != "@everyone" {
		t.Fatalf("unexpected content: %q", received.Content)
	}
	if len(received.AllowedMentions.Parse) != 1 || received.AllowedMentions.Parse[0] != "everyone" {
		t.Fatalf("unexpected allowed mentions: %+v", received.AllowedMentions)
	}
	if len(received.Embeds) != 1 {
		t.Fatalf("expected one embed, got %d", len(received.Embeds))
	}
	eventURL := "https://mix.example.com/events/event-456"
	if received.Embeds[0].Title != "Новый микс: Воскресный микс" ||
		received.Embeds[0].Description != event.Description ||
		received.Embeds[0].URL != eventURL ||
		len(received.Embeds[0].Fields) != 2 {
		t.Fatalf("unexpected embed: %+v", received.Embeds[0])
	}
	if len(received.Components) != 1 || len(received.Components[0].Components) != 1 {
		t.Fatalf("unexpected components: %+v", received.Components)
	}
	linkButton := received.Components[0].Components[0]
	if linkButton.Style != 5 || linkButton.Label != "Зарегистрироваться" || linkButton.URL != eventURL {
		t.Fatalf("unexpected registration button: %+v", linkButton)
	}
}

func TestAnnounceEventCreatedReturnsDiscordError(t *testing.T) {
	server := httptest.NewServer(http.HandlerFunc(func(response http.ResponseWriter, _ *http.Request) {
		http.Error(response, `{"message":"Missing Permissions"}`, http.StatusForbidden)
	}))
	defer server.Close()
	announcer, err := New(Config{
		BotToken:   "secret-token",
		ChannelID:  "channel-123",
		PublicURL:  "https://mix.example.com",
		APIBaseURL: server.URL,
		HTTPClient: server.Client(),
	})
	if err != nil {
		t.Fatal(err)
	}

	if err := announcer.AnnounceEventCreated(context.Background(), domain.Event{ID: "event-456"}); err == nil {
		t.Fatal("expected Discord error")
	}
}