// ABOUTME: Unit tests for notifications cron endpoint.
// ABOUTME: Tests daily email notifications sent at user's preferred time.
import { afterEach, beforeEach, describe, expect, it, vi } from "vitest";

import type { DailyLog, User } from "@/types";

// Mock users and daily logs returned by PocketBase
let mockUsers: User[] = [];
let mockDailyLogs: DailyLog[] = [];
const mockPbUpdate = vi.fn().mockResolvedValue({ id: "log123" });

// Mock PocketBase
vi.mock("@/lib/pocketbase", () => ({
  createPocketBaseClient: vi.fn(() => ({
    collection: vi.fn((name: string) => ({
      getFullList: vi.fn(async () => {
        if (name === "users") {
          return mockUsers;
        }
        if (name === "dailyLogs") {
          return mockDailyLogs;
        }
        return [];
      }),
      update: mockPbUpdate,
    })),
  })),
}));

// Mock email sending
const mockSendDailyEmail = vi.fn().mockResolvedValue(undefined);
const mockSendTokenExpirationWarning = vi.fn().mockResolvedValue(undefined);
const mockSendPeriodConfirmationEmail = vi.fn().mockResolvedValue(undefined);

vi.mock("@/lib/email", () => ({
  sendDailyEmail: (data: unknown) => mockSendDailyEmail(data),
  sendTokenExpirationWarning: (...args: unknown[]) =>
    mockSendTokenExpirationWarning(...args),
  sendPeriodConfirmationEmail: (...args: unknown[]) =>
    mockSendPeriodConfirmationEmail(...args),
}));

import { POST } from "./route";

describe("POST /api/cron/notifications", () => {
  const validSecret = "test-cron-secret";

  // Helper to create a mock user
  function createMockUser(overrides: Partial<User> = {}): User {
    return {
      id: "user123",
      email: "test@example.com",
      garminConnected: true,
      garminOauth1Token: "encrypted:oauth1-token",
      garminOauth2Token: "encrypted:oauth2-token",
      garminTokenExpiresAt: new Date(Date.now() + 30 * 24 * 60 * 60 * 1000),
      garminRefreshTokenExpiresAt: null,
      calendarToken: "cal-token",
      lastPeriodDate: new Date("2025-01-01"),
      cycleLength: 28,
      notificationTime: "07:00",
      timezone: "UTC",
      activeOverrides: [],
      created: new Date("2024-01-01"),
      updated: new Date("2025-01-10"),
      ...overrides,
    };
  }

  // Helper to create a mock daily log
  function createMockDailyLog(overrides: Partial<DailyLog> = {}): DailyLog {
    return {
      id: "log123",
      user: "user123",
      date: new Date(),
      cycleDay: 5,
      phase: "FOLLICULAR",
      bodyBatteryCurrent: 85,
      bodyBatteryYesterdayLow: 50,
      hrvStatus: "Balanced",
      weekIntensityMinutes: 45,
      phaseLimit: 120,
      remainingMinutes: 75,
      trainingDecision: "TRAIN",
      decisionReason: "OK to train - follow phase plan",
      notificationSentAt: null,
      created: new Date(),
      ...overrides,
    };
  }

  // Helper to create mock request with optional auth header
  function createMockRequest(authHeader?: string): Request {
    const headers = new Headers();
    if (authHeader) {
      headers.set("authorization", authHeader);
    }
    return {
      headers,
    } as unknown as Request;
  }

  beforeEach(() => {
    vi.clearAllMocks();
    mockUsers = [];
    mockDailyLogs = [];
    process.env.CRON_SECRET = validSecret;
    // Mock current time to 07:00 UTC
    vi.useFakeTimers();
    vi.setSystemTime(new Date("2025-01-15T07:00:00Z"));
  });

  afterEach(() => {
    vi.useRealTimers();
  });

  describe("Authentication", () => {
    it("returns 401 when authorization header is missing", async () => {
      const response = await POST(createMockRequest());

      expect(response.status).toBe(401);
      const body = await response.json();
      expect(body.error).toBe("Unauthorized");
    });

    it("returns 401 when secret is incorrect", async () => {
      const response = await POST(createMockRequest("Bearer wrong-secret"));

      expect(response.status).toBe(401);
      const body = await response.json();
      expect(body.error).toBe("Unauthorized");
    });

    it("returns 401 when CRON_SECRET env var is not set", async () => {
      process.env.CRON_SECRET = "";

      const response = await POST(createMockRequest(`Bearer ${validSecret}`));

      expect(response.status).toBe(401);
    });
  });

  describe("User time matching", () => {
    it("sends notification when current hour matches user notificationTime in UTC", async () => {
      // Current time is 07:00 UTC, user wants notifications at 07:00 UTC
      mockUsers = [
        createMockUser({ notificationTime: "07:00", timezone: "UTC" }),
      ];
      mockDailyLogs = [createMockDailyLog()];

      const response = await POST(createMockRequest(`Bearer ${validSecret}`));

      expect(response.status).toBe(200);
      expect(mockSendDailyEmail).toHaveBeenCalled();
    });

    it("does not send notification when hour does not match", async () => {
      // Current time is 07:00 UTC, user wants notifications at 08:00 UTC
      mockUsers = [
        createMockUser({ notificationTime: "08:00", timezone: "UTC" }),
      ];
      mockDailyLogs = [createMockDailyLog()];

      const response = await POST(createMockRequest(`Bearer ${validSecret}`));

      expect(response.status).toBe(200);
      expect(mockSendDailyEmail).not.toHaveBeenCalled();
    });

    it("handles timezone conversion correctly", async () => {
      // Current time is 07:00 UTC = 02:00 America/New_York (EST is UTC-5)
      mockUsers = [
        createMockUser({
          notificationTime: "02:00",
          timezone: "America/New_York",
        }),
      ];
      mockDailyLogs = [createMockDailyLog()];

      const response = await POST(createMockRequest(`Bearer ${validSecret}`));

      expect(response.status).toBe(200);
      expect(mockSendDailyEmail).toHaveBeenCalled();
    });

    it("skips users with non-matching timezone hours", async () => {
      // Current time is 07:00 UTC = 02:00 EST, user wants 07:00 EST (which is 12:00 UTC)
      mockUsers = [
        createMockUser({
          notificationTime: "07:00",
          timezone: "America/New_York",
        }),
      ];
      mockDailyLogs = [createMockDailyLog()];

      const response = await POST(createMockRequest(`Bearer ${validSecret}`));

      expect(response.status).toBe(200);
      expect(mockSendDailyEmail).not.toHaveBeenCalled();
    });
  });

  describe("DailyLog handling", () => {
    it("does not send notification if no DailyLog exists for today", async () => {
      mockUsers = [
        createMockUser({ notificationTime: "07:00", timezone: "UTC" }),
      ];
      mockDailyLogs = []; // No daily log

      const response = await POST(createMockRequest(`Bearer ${validSecret}`));

      expect(response.status).toBe(200);
      expect(mockSendDailyEmail).not.toHaveBeenCalled();
      const body = await response.json();
      expect(body.skippedNoLog).toBe(1);
    });

    it("does not send notification if already sent today", async () => {
      mockUsers = [
        createMockUser({ notificationTime: "07:00", timezone: "UTC" }),
      ];
      mockDailyLogs = [createMockDailyLog({ notificationSentAt: new Date() })];

      const response = await POST(createMockRequest(`Bearer ${validSecret}`));

      expect(response.status).toBe(200);
      expect(mockSendDailyEmail).not.toHaveBeenCalled();
      const body = await response.json();
      expect(body.skippedAlreadySent).toBe(1);
    });

    it("updates notificationSentAt after sending email", async () => {
      mockUsers = [
        createMockUser({ notificationTime: "07:00", timezone: "UTC" }),
      ];
      mockDailyLogs = [createMockDailyLog({ id: "log456" })];

      await POST(createMockRequest(`Bearer ${validSecret}`));

      expect(mockPbUpdate).toHaveBeenCalledWith("log456", {
        notificationSentAt: expect.any(String),
      });
    });
  });

  describe("Email content", () => {
    it("sends email with correct user email address", async () => {
      mockUsers = [
        createMockUser({
          email: "recipient@example.com",
          notificationTime: "07:00",
          timezone: "UTC",
        }),
      ];
      mockDailyLogs = [createMockDailyLog()];

      await POST(createMockRequest(`Bearer ${validSecret}`));

      expect(mockSendDailyEmail).toHaveBeenCalledWith(
        expect.objectContaining({
          to: "recipient@example.com",
        }),
      );
    });

    it("includes cycle day and phase from DailyLog", async () => {
      mockUsers = [
        createMockUser({ notificationTime: "07:00", timezone: "UTC" }),
      ];
      mockDailyLogs = [
        createMockDailyLog({ cycleDay: 10, phase: "FOLLICULAR" }),
      ];

      await POST(createMockRequest(`Bearer ${validSecret}`));

      expect(mockSendDailyEmail).toHaveBeenCalledWith(
        expect.objectContaining({
          cycleDay: 10,
          phase: "FOLLICULAR",
        }),
      );
    });

    it("includes biometric data from DailyLog", async () => {
      mockUsers = [
        createMockUser({ notificationTime: "07:00", timezone: "UTC" }),
      ];
      mockDailyLogs = [
        createMockDailyLog({
          bodyBatteryCurrent: 90,
          bodyBatteryYesterdayLow: 45,
          hrvStatus: "Balanced",
          weekIntensityMinutes: 60,
          phaseLimit: 120,
          remainingMinutes: 60,
        }),
      ];

      await POST(createMockRequest(`Bearer ${validSecret}`));

      expect(mockSendDailyEmail).toHaveBeenCalledWith(
        expect.objectContaining({
          bodyBatteryCurrent: 90,
          bodyBatteryYesterdayLow: 45,
          hrvStatus: "Balanced",
          weekIntensity: 60,
          phaseLimit: 120,
          remainingMinutes: 60,
        }),
      );
    });

    it("includes training decision from DailyLog", async () => {
      mockUsers = [
        createMockUser({ notificationTime: "07:00", timezone: "UTC" }),
      ];
      mockDailyLogs = [
        createMockDailyLog({
          trainingDecision: "TRAIN",
          decisionReason: "OK to train - follow phase plan",
        }),
      ];

      await POST(createMockRequest(`Bearer ${validSecret}`));

      expect(mockSendDailyEmail).toHaveBeenCalledWith(
        expect.objectContaining({
          decision: expect.objectContaining({
            status: "TRAIN",
            reason: "OK to train - follow phase plan",
          }),
        }),
      );
    });

    it("includes nutrition guidance based on cycle day", async () => {
      mockUsers = [
        createMockUser({ notificationTime: "07:00", timezone: "UTC" }),
      ];
      mockDailyLogs = [createMockDailyLog({ cycleDay: 10 })]; // Day 10 = follicular, flax+pumpkin seeds

      await POST(createMockRequest(`Bearer ${validSecret}`));

      expect(mockSendDailyEmail).toHaveBeenCalledWith(
        expect.objectContaining({
          seeds: expect.stringContaining("Flax"),
          carbRange: expect.any(String),
          ketoGuidance: expect.any(String),
        }),
      );
    });
  });

  describe("Error handling", () => {
    it("continues processing other users when email sending fails", async () => {
      mockUsers = [
        createMockUser({
          id: "user1",
          email: "user1@example.com",
          notificationTime: "07:00",
          timezone: "UTC",
        }),
        createMockUser({
          id: "user2",
          email: "user2@example.com",
          notificationTime: "07:00",
          timezone: "UTC",
        }),
      ];
      mockDailyLogs = [
        createMockDailyLog({ id: "log1", user: "user1" }),
        createMockDailyLog({ id: "log2", user: "user2" }),
      ];
      // First email fails, second succeeds
      mockSendDailyEmail
        .mockRejectedValueOnce(new Error("Email error"))
        .mockResolvedValueOnce(undefined);

      const response = await POST(createMockRequest(`Bearer ${validSecret}`));

      expect(response.status).toBe(200);
      const body = await response.json();
      expect(body.errors).toBe(1);
      expect(body.notificationsSent).toBe(1);
    });

    it("handles null body battery values", async () => {
      mockUsers = [
        createMockUser({ notificationTime: "07:00", timezone: "UTC" }),
      ];
      mockDailyLogs = [
        createMockDailyLog({
          bodyBatteryCurrent: null,
          bodyBatteryYesterdayLow: null,
        }),
      ];

      await POST(createMockRequest(`Bearer ${validSecret}`));

      expect(mockSendDailyEmail).toHaveBeenCalledWith(
        expect.objectContaining({
          bodyBatteryCurrent: null,
          bodyBatteryYesterdayLow: null,
        }),
      );
    });
  });

  describe("Response format", () => {
    it("returns success with zero notifications when no users match", async () => {
      mockUsers = [];

      const response = await POST(createMockRequest(`Bearer ${validSecret}`));

      expect(response.status).toBe(200);
      const body = await response.json();
      expect(body).toMatchObject({
        success: true,
        notificationsSent: 0,
        errors: 0,
      });
    });

    it("returns summary with counts", async () => {
      mockUsers = [
        createMockUser({
          id: "user1",
          notificationTime: "07:00",
          timezone: "UTC",
        }),
        createMockUser({
          id: "user2",
          notificationTime: "07:00",
          timezone: "UTC",
        }),
      ];
      mockDailyLogs = [
        createMockDailyLog({ id: "log1", user: "user1" }),
        createMockDailyLog({ id: "log2", user: "user2" }),
      ];

      const response = await POST(createMockRequest(`Bearer ${validSecret}`));

      expect(response.status).toBe(200);
      const body = await response.json();
      expect(body).toMatchObject({
        success: true,
        notificationsSent: 2,
        errors: 0,
        skippedNoLog: 0,
        skippedAlreadySent: 0,
        skippedWrongTime: 0,
      });
    });

    it("includes timestamp in response", async () => {
      mockUsers = [];

      const response = await POST(createMockRequest(`Bearer ${validSecret}`));

      const body = await response.json();
      expect(body.timestamp).toBeDefined();
      expect(new Date(body.timestamp)).toBeInstanceOf(Date);
    });
  });
});