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

import { queueTask } from "./queueTask";

describe("queueTask - delayed task handling", () => {
  const MAX_DELAY_SECONDS = 12 * 60 * 60; // 43,200 seconds

  let mockEnv: Cloudflare.Env;
  let kvPutSpy: ReturnType<typeof vi.fn>;
  let queueSendSpy: ReturnType<typeof vi.fn>;

  beforeEach(() => {
    kvPutSpy = vi.fn(() => Promise.resolve());
    queueSendSpy = vi.fn(() => Promise.resolve());

    mockEnv = {
      DELAYED_TASKS: {
        put: kvPutSpy,
        get: vi.fn(() => Promise.resolve(null)),
        delete: vi.fn(() => Promise.resolve()),
        list: vi.fn(() => Promise.resolve({ keys: [], list_complete: true })),
        getWithMetadata: vi.fn(() =>
          Promise.resolve({ value: null, metadata: null }),
        ),
      } as any,
      NEW_EPISODE: {
        send: queueSendSpy,
      } as any,
      ANILIST_UPDATES: {
        send: vi.fn(() => Promise.resolve()),
      } as any,
    } as any;

    // Mock crypto.randomUUID
    (globalThis as any).crypto = { randomUUID: vi.fn(() => "test-uuid-123") };
  });

  describe("tasks with delay <= 9 hours", () => {
    it("queues task directly when delay is less than 9 hours", async () => {
      await queueTask(
        "NEW_EPISODE",
        { aniListId: 123, episodeNumber: 1 },
        {
          scheduleConfig: { delay: { hours: 6 } },
          env: mockEnv,
        },
      );

      // Should queue directly
      expect(queueSendSpy).toHaveBeenCalledTimes(1);
      // Should NOT store in KV
      expect(kvPutSpy).not.toHaveBeenCalled();
    });

    it("queues task directly when delay is exactly 9 hours", async () => {
      await queueTask(
        "NEW_EPISODE",
        { aniListId: 456, episodeNumber: 2 },
        {
          scheduleConfig: { delay: { hours: 9 } },
          env: mockEnv,
        },
      );

      expect(queueSendSpy).toHaveBeenCalledTimes(1);
      expect(kvPutSpy).not.toHaveBeenCalled();
    });

    it("passes correct delay to queue", async () => {
      await queueTask(
        "NEW_EPISODE",
        { aniListId: 789, episodeNumber: 3 },
        {
          scheduleConfig: { delay: { hours: 3, minutes: 30 } },
          env: mockEnv,
        },
      );

      const callArgs = queueSendSpy.mock.calls[0];
      expect(callArgs[1].delaySeconds).toBe(3 * 3600 + 30 * 60);
    });
  });

  describe("tasks with delay > 9 hours", () => {
    it("stores task in KV when delay exceeds 9 hours", async () => {
      await queueTask(
        "NEW_EPISODE",
        { aniListId: 111, episodeNumber: 4 },
        {
          scheduleConfig: { delay: { hours: 24 } },
          env: mockEnv,
        },
      );

      // Should store in KV
      expect(kvPutSpy).toHaveBeenCalledTimes(1);
      // Should NOT queue directly
      expect(queueSendSpy).not.toHaveBeenCalled();
    });

    it("stores task in KV when delay is 9 hours + 1 second", async () => {
      await queueTask(
        "NEW_EPISODE",
        { aniListId: 222, episodeNumber: 5 },
        {
          scheduleConfig: { delay: { hours: 9, seconds: 1 } },
          env: mockEnv,
        },
      );

      expect(kvPutSpy).toHaveBeenCalledTimes(1);
      expect(queueSendSpy).not.toHaveBeenCalled();
    });

    it("generates correct KV key format", async () => {
      const nowSeconds = Math.floor(Date.now() / 1000);

      await queueTask(
        "NEW_EPISODE",
        { aniListId: 333, episodeNumber: 6 },
        {
          scheduleConfig: { delay: { hours: 48 } },
          env: mockEnv,
        },
      );

      const kvKey = kvPutSpy.mock.calls[0][0];
      expect(kvKey).toMatch(/^delayed-task:\d+:test-uuid-123$/);

      // Verify timestamp is approximately correct (within 1 second)
      const timestampMatch = kvKey.match(/delayed-task:(\d+):/);
      if (timestampMatch) {
        const storedTimestamp = parseInt(timestampMatch[1]);
        const expectedTimestamp = nowSeconds + 48 * 3600;
        expect(Math.abs(storedTimestamp - expectedTimestamp)).toBeLessThan(2);
      }
    });

    it("stores correct metadata in KV", async () => {
      await queueTask(
        "NEW_EPISODE",
        { aniListId: 444, episodeNumber: 7 },
        {
          scheduleConfig: { delay: { hours: 36 } },
          env: mockEnv,
        },
      );

      const kvValue = kvPutSpy.mock.calls[0][1];
      const metadata = JSON.parse(kvValue);

      expect(metadata.queueName).toBe("NEW_EPISODE");
      expect(metadata.body).toEqual({ aniListId: 444, episodeNumber: 7 });
      expect(metadata.taskId).toBe("test-uuid-123");
      expect(metadata.retryCount).toBe(0);
      expect(metadata.headers).toBeDefined();
      expect(metadata.scheduledEpochTime).toBeTypeOf("number");
      expect(metadata.createdAt).toBeTypeOf("number");
    });

    it("throws error when DELAYED_TASKS KV is not available", async () => {
      const envWithoutKV = { ...mockEnv };
      delete (envWithoutKV as any).DELAYED_TASKS;

      await expect(
        queueTask(
          "NEW_EPISODE",
          { aniListId: 555, episodeNumber: 8 },
          {
            scheduleConfig: { delay: { hours: 24 } },
            env: envWithoutKV,
          },
        ),
      ).rejects.toThrow("DELAYED_TASKS KV namespace not available");
    });
  });

  describe("epoch time scheduling", () => {
    it("queues directly when epoch time is within 9 hours", async () => {
      const futureTime = Math.floor(Date.now() / 1000) + 3600; // 1 hour from now

      await queueTask(
        "NEW_EPISODE",
        { aniListId: 666, episodeNumber: 9 },
        {
          scheduleConfig: { epochTime: futureTime },
          env: mockEnv,
        },
      );

      expect(queueSendSpy).toHaveBeenCalledTimes(1);
      expect(kvPutSpy).not.toHaveBeenCalled();
    });

    it("stores in KV when epoch time is beyond 9 hours", async () => {
      const futureTime = Math.floor(Date.now() / 1000) + 24 * 3600; // 24 hours from now

      await queueTask(
        "NEW_EPISODE",
        { aniListId: 777, episodeNumber: 10 },
        {
          scheduleConfig: { epochTime: futureTime },
          env: mockEnv,
        },
      );

      expect(kvPutSpy).toHaveBeenCalledTimes(1);
      expect(queueSendSpy).not.toHaveBeenCalled();
    });
  });
});