import { describe, it, expect, vi } from 'vitest';

// Stub debugLog so the import chain doesn't pull in discord.js / config.
vi.mock('../services/debugLog.js', () => ({
  logError: vi.fn()
}));

import { recordAction, denormalizeTicket, deriveTicketType } from '../services/staffStats.js';

// ---------------------------------------------------------------------------
// deriveTicketType
// ---------------------------------------------------------------------------

describe('deriveTicketType', () => {
  it('returns "discord" for discord- prefix', () => {
    expect(deriveTicketType('discord-abc123')).toBe('discord');
  });

  it('returns "discord" for discord-msg- prefix', () => {
    expect(deriveTicketType('discord-msg-abc123')).toBe('discord');
  });

  it('returns "email" for a Gmail thread ID', () => {
    expect(deriveTicketType('18f3a2b1c0d4e5f6')).toBe('email');
  });

  it('returns "email" for null / undefined / empty gmailThreadId', () => {
    expect(deriveTicketType(null)).toBe('email');
    expect(deriveTicketType(undefined)).toBe('email');
    expect(deriveTicketType('')).toBe('email');
  });
});

// ---------------------------------------------------------------------------
// denormalizeTicket — field extraction
// ---------------------------------------------------------------------------

describe('denormalizeTicket', () => {
  const emailTicket = {
    gmailThreadId:  '18f3a2b1c0d4e5f6',
    escalationTier: 1,
    priority:       'high',
    game:           'Minecraft',
    senderEmail:    'user@example.com',
    creatorId:      '111222333444555666',
    claimerId:      '999888777666555444'
  };

  const discordTicket = {
    gmailThreadId:  'discord-msg-xyz789',
    escalationTier: 0,
    priority:       'normal',
    game:           null,
    senderEmail:    'noreply@discord',
    creatorId:      '777666555444333222'
  };

  it('derives ticketType "email" for a Gmail thread', () => {
    expect(denormalizeTicket(emailTicket).ticketType).toBe('email');
  });

  it('derives ticketType "discord" for a discord-msg- thread', () => {
    expect(denormalizeTicket(discordTicket).ticketType).toBe('discord');
  });

  it('copies all standard event fields from the ticket', () => {
    const f = denormalizeTicket(emailTicket);
    expect(f.tier).toBe(1);
    expect(f.priority).toBe('high');
    expect(f.game).toBe('Minecraft');
    expect(f.senderEmail).toBe('user@example.com');
    expect(f.creatorId).toBe('111222333444555666');
    expect(f.gmailThreadId).toBe('18f3a2b1c0d4e5f6');
  });

  it('defaults tier to 0 when escalationTier is absent', () => {
    expect(denormalizeTicket({ gmailThreadId: 'abc' }).tier).toBe(0);
  });

  it('does NOT include guildId (must come from call site)', () => {
    const f = denormalizeTicket(emailTicket);
    expect(Object.prototype.hasOwnProperty.call(f, 'guildId')).toBe(false);
  });

  it('returns {} for a null ticket', () => {
    expect(denormalizeTicket(null)).toEqual({});
  });
});

// ---------------------------------------------------------------------------
// recordAction — payload merging / override precedence
// ---------------------------------------------------------------------------

describe('recordAction payload merging', () => {
  const ticket = {
    gmailThreadId:  '18f3a2b1c0d4e5f6',
    escalationTier: 2,
    priority:       'medium',
    game:           'Rust',
    senderEmail:    'player@example.com',
    creatorId:      '100200300400500600'
  };

  it('payload fields override denormalized ticket fields', () => {
    const { ticket: t, ...overrides } = {
      ticket,
      guildId:  '555666777888999000',
      game:     'OverriddenGame',
      priority: 'low'
    };
    const merged = { ...denormalizeTicket(t), ...overrides };
    expect(merged.game).toBe('OverriddenGame');
    expect(merged.priority).toBe('low');
    expect(merged.guildId).toBe('555666777888999000');
  });

  it('guildId (call-site only) passes through from payload', () => {
    const { ticket: t, ...rest } = { ticket, guildId: '123456789012345678' };
    const merged = { ...denormalizeTicket(t), ...rest };
    expect(merged.guildId).toBe('123456789012345678');
  });

  it('close-only fields pass through from payload', () => {
    const { ticket: t, ...rest } = {
      ticket,
      closerType: 'staff',
      resolverId: '123456789012345678',
      wasClaimed: true
    };
    const merged = { ...denormalizeTicket(t), ...rest };
    expect(merged.closerType).toBe('staff');
    expect(merged.resolverId).toBe('123456789012345678');
    expect(merged.wasClaimed).toBe(true);
  });

  it('transfer-only fields (fromId/toId) pass through from payload', () => {
    const { ticket: t, ...rest } = {
      ticket,
      fromId: '111111111111111111',
      toId:   '222222222222222222'
    };
    const merged = { ...denormalizeTicket(t), ...rest };
    expect(merged.fromId).toBe('111111111111111111');
    expect(merged.toId).toBe('222222222222222222');
  });
});

// ---------------------------------------------------------------------------
// recordAction — fire-and-forget discipline
//
// In the test environment there is no real MongoDB connection and the
// StaffAction model schema is not registered, so mongoose.model('StaffAction')
// throws MissingSchemaError synchronously. This is exactly the kind of error
// recordAction must swallow — it proves the outer try/catch works. The async
// .catch() path is exercised transitively: any callers in later phases that
// succeed with a real DB connection will hit that path.
// ---------------------------------------------------------------------------

describe('recordAction fire-and-forget', () => {
  it('returns undefined (callers do not await)', () => {
    expect(recordAction('staff1', 'claim', {})).toBeUndefined();
  });

  it('does not throw when called with null / undefined / empty payload', () => {
    expect(() => recordAction('staff1', 'reopen', undefined)).not.toThrow();
    expect(() => recordAction('staff1', 'reopen', null)).not.toThrow();
    expect(() => recordAction('staff1', 'reopen', {})).not.toThrow();
  });

  it('does not throw even when the model layer errors (model not registered)', () => {
    // mongoose.model('StaffAction') throws MissingSchemaError synchronously in
    // this environment — recordAction must absorb it and never rethrow.
    expect(() => recordAction('staff1', 'close', {
      ticket: {
        gmailThreadId:  'discord-abc',
        escalationTier: 0,
        priority:       'normal',
        senderEmail:    'a@b.com',
        creatorId:      '123'
      },
      guildId:    '999',
      closerType: 'staff',
      resolverId: '123456789012345678',
      wasClaimed: true
    })).not.toThrow();
  });
});