/**
 * Unit tests for currentDuty (findCurrentDuty, renderCurrentDutyContent, showCurrentDutyView).
 */

import { describe, it, expect, beforeAll, vi } from "vitest";

vi.mock("./api.js", () => ({
  fetchDuties: vi.fn().mockResolvedValue([])
}));

import {
  findCurrentDuty,
  getRemainingTime,
  renderCurrentDutyContent
} from "./currentDuty.js";

describe("currentDuty", () => {
  beforeAll(() => {
    document.body.innerHTML =
      '<div id="loading"></div>' +
      '<div class="container">' +
      '<div id="calendarSticky"></div>' +
      '<div id="dutyList"></div>' +
      '<div id="currentDutyView" class="current-duty-view hidden"></div>' +
      "</div>";
  });

  describe("getRemainingTime", () => {
    it("returns hours and minutes until end from now", () => {
      const endAt = "2025-03-02T17:30:00.000Z";
      vi.useFakeTimers();
      vi.setSystemTime(new Date("2025-03-02T12:00:00.000Z"));
      const { hours, minutes } = getRemainingTime(endAt);
      vi.useRealTimers();
      expect(hours).toBe(5);
      expect(minutes).toBe(30);
    });

    it("returns 0 when end is in the past", () => {
      const endAt = "2025-03-02T09:00:00.000Z";
      vi.useFakeTimers();
      vi.setSystemTime(new Date("2025-03-02T12:00:00.000Z"));
      const { hours, minutes } = getRemainingTime(endAt);
      vi.useRealTimers();
      expect(hours).toBe(0);
      expect(minutes).toBe(0);
    });
  });

  describe("findCurrentDuty", () => {
    it("returns duty when now is between start_at and end_at", () => {
      const now = new Date();
      const start = new Date(now);
      start.setHours(start.getHours() - 1, 0, 0, 0);
      const end = new Date(now);
      end.setHours(end.getHours() + 1, 0, 0, 0);
      const duties = [
        {
          event_type: "duty",
          full_name: "Иванов",
          start_at: start.toISOString(),
          end_at: end.toISOString()
        }
      ];
      const duty = findCurrentDuty(duties);
      expect(duty).not.toBeNull();
      expect(duty.full_name).toBe("Иванов");
    });

    it("returns null when no duty overlaps current time", () => {
      const duties = [
        {
          event_type: "duty",
          full_name: "Past",
          start_at: "2020-01-01T09:00:00Z",
          end_at: "2020-01-01T17:00:00Z"
        },
        {
          event_type: "duty",
          full_name: "Future",
          start_at: "2030-01-01T09:00:00Z",
          end_at: "2030-01-01T17:00:00Z"
        }
      ];
      expect(findCurrentDuty(duties)).toBeNull();
    });
  });

  describe("renderCurrentDutyContent", () => {
    it("renders no-duty message and back button when duty is null", () => {
      const html = renderCurrentDutyContent(null, "en");
      expect(html).toContain("current-duty-card");
      expect(html).toContain("current-duty-card--no-duty");
      expect(html).toContain("Current Duty");
      expect(html).toContain("current-duty-no-duty-wrap");
      expect(html).toContain("current-duty-no-duty-icon");
      expect(html).toContain("current-duty-no-duty");
      expect(html).toContain("No one is on duty right now");
      expect(html).toContain("Back to calendar");
      expect(html).toContain('data-action="back"');
      expect(html).not.toContain("current-duty-live-dot");
    });

    it("renders duty card with name, shift, remaining time, and back button when duty has no contacts", () => {
      const duty = {
        event_type: "duty",
        full_name: "Иванов Иван",
        start_at: "2025-03-02T06:00:00.000Z",
        end_at: "2025-03-03T06:00:00.000Z"
      };
      const html = renderCurrentDutyContent(duty, "ru");
      expect(html).toContain("current-duty-live-dot");
      expect(html).toContain("Текущее дежурство");
      expect(html).toContain("Иванов Иван");
      expect(html).toContain("Смена");
      expect(html).toContain("current-duty-remaining");
      expect(html).toMatch(/Осталось:\s*\d+ч\s*\d+мин/);
      expect(html).toContain("Назад к календарю");
      expect(html).toContain('data-action="back"');
    });

    it("renders duty card with phone and Telegram links when present", () => {
      const duty = {
        event_type: "duty",
        full_name: "Alice",
        start_at: "2025-03-02T09:00:00",
        end_at: "2025-03-02T17:00:00",
        phone: "+7 900 123-45-67",
        username: "alice_dev"
      };
      const html = renderCurrentDutyContent(duty, "en");
      expect(html).toContain("Alice");
      expect(html).toContain("current-duty-remaining");
      expect(html).toMatch(/Remaining:\s*\d+h\s*\d+min/);
      expect(html).toContain("current-duty-contact-row");
      expect(html).toContain("current-duty-contact-row--blocks");
      expect(html).toContain("current-duty-contact-block");
      expect(html).toContain('href="tel:');
      expect(html).toContain("+7 900 123-45-67");
      expect(html).toContain("https://t.me/");
      expect(html).toContain("alice_dev");
      expect(html).toContain("Back to calendar");
    });
  });

  describe("showCurrentDutyView", () => {
    it("hides the global loading element when called", async () => {
      vi.resetModules();
      const { showCurrentDutyView } = await import("./currentDuty.js");
      await showCurrentDutyView(() => {});
      const loading = document.getElementById("loading");
      expect(loading).not.toBeNull();
      expect(loading.classList.contains("hidden")).toBe(true);
    });
  });
});