/**
 * Phase 10 — /stats command handler tests.
 * Injectable deps — no vi.mock.
 */
import { describe, it, expect, vi } from 'vitest';
import { MessageFlags } from 'discord.js';
import { handleStats, handleStatsAutocomplete } from '../handlers/commands/stats.js';

const MS_PER_DAY = 24 * 60 * 60 * 1000;
const NOW_MS = 1_700_000_000_000; // fixed epoch for deterministic cutoff assertions

// ---------------------------------------------------------------------------
// Factories
// ---------------------------------------------------------------------------

function makeInteraction({ userId = 'caller-001', memberUserId, memberUsername, periodStr, source } = {}) {
  return {
    user: { id: userId, username: 'testuser' },
    guildId: 'guild-001',
    options: {
      getUser: (name) => {
        if (name === 'member' && memberUserId) {
          return { id: memberUserId, username: memberUsername || 'member-user' };
        }
        return null;
      },
      getString: (name) => {
        if (name === 'period') return periodStr || null;
        if (name === 'source') return source || null;
        return null;
      }
    },
    reply: vi.fn().mockResolvedValue(undefined)
  };
}

function makeStaffAction(events = []) {
  return {
    find: vi.fn().mockReturnValue({ lean: () => Promise.resolve(events) })
  };
}

function captureStaffAction() {
  let capturedFilter;
  return {
    sa: {
      find: (filter) => {
        capturedFilter = filter;
        return { lean: () => Promise.resolve([]) };
      }
    },
    getFilter: () => capturedFilter
  };
}

function deps(overrides = {}) {
  return {
    StaffAction: makeStaffAction(),
    now: () => NOW_MS,
    adminIds: [],
    ...overrides
  };
}

// ---------------------------------------------------------------------------
// handleStatsAutocomplete
// ---------------------------------------------------------------------------

describe('handleStatsAutocomplete', () => {
  function makeAutoInteraction(focusedValue = '') {
    return {
      options: { getFocused: () => focusedValue },
      respond: vi.fn().mockResolvedValue(undefined)
    };
  }

  it('returns all 5 presets when focused input is empty', async () => {
    const i = makeAutoInteraction('');
    await handleStatsAutocomplete(i);
    const [[suggestions]] = i.respond.mock.calls;
    expect(suggestions).toHaveLength(5);
    const values = suggestions.map(s => s.value);
    expect(values).toContain('7 days');
    expect(values).toContain('30 days');
    expect(values).toContain('3 months');
    expect(values).toContain('6 months');
    expect(values).toContain('1 year');
  });

  it('filters to presets matching the typed substring', async () => {
    const i = makeAutoInteraction('days');
    await handleStatsAutocomplete(i);
    const [[suggestions]] = i.respond.mock.calls;
    const values = suggestions.map(s => s.value);
    expect(values).toContain('7 days');
    expect(values).toContain('30 days');
    expect(values).not.toContain('3 months');
    expect(values).not.toContain('1 year');
  });

  it('echoes typed input as first suggestion when it does not exactly match a preset', async () => {
    const i = makeAutoInteraction('14d');
    await handleStatsAutocomplete(i);
    const [[suggestions]] = i.respond.mock.calls;
    expect(suggestions[0].value).toBe('14d');
    expect(suggestions[0].name).toBe('14d');
  });

  it('does not duplicate a preset when typed input exactly matches one', async () => {
    const i = makeAutoInteraction('30 days');
    await handleStatsAutocomplete(i);
    const [[suggestions]] = i.respond.mock.calls;
    expect(suggestions.filter(s => s.value === '30 days')).toHaveLength(1);
  });

  it('calls interaction.respond exactly once', async () => {
    const i = makeAutoInteraction('');
    await handleStatsAutocomplete(i);
    expect(i.respond).toHaveBeenCalledTimes(1);
  });
});

// ---------------------------------------------------------------------------
// handleStats — gating (STATS_ADMIN_IDS)
// ---------------------------------------------------------------------------

describe('handleStats — gating', () => {
  it('caller views own stats when no member option is provided', async () => {
    const interaction = makeInteraction({ userId: 'caller-001' });
    await handleStats(interaction, deps());
    expect(interaction.reply).toHaveBeenCalledTimes(1);
    const [[replyArg]] = interaction.reply.mock.calls;
    expect(replyArg.content).toBeUndefined();
    expect(replyArg.embeds).toBeDefined();
  });

  it('admin can view another member\'s stats', async () => {
    const interaction = makeInteraction({ userId: 'admin-001', memberUserId: 'other-002' });
    await handleStats(interaction, deps({ adminIds: ['admin-001'] }));
    const [[replyArg]] = interaction.reply.mock.calls;
    expect(replyArg.embeds).toBeDefined();
    expect(replyArg.content).toBeUndefined();
  });

  it('non-admin is blocked with the exact error message when member option is set', async () => {
    const interaction = makeInteraction({ userId: 'plain-001', memberUserId: 'other-002' });
    await handleStats(interaction, deps({ adminIds: [] }));
    const [[replyArg]] = interaction.reply.mock.calls;
    expect(replyArg.content).toBe('You can only view your own stats.');
    expect(replyArg.flags).toBe(MessageFlags.Ephemeral);
    expect(replyArg.embeds).toBeUndefined();
  });

  it('non-admin can view their own stats (no member option)', async () => {
    const interaction = makeInteraction({ userId: 'plain-001' });
    await handleStats(interaction, deps({ adminIds: [] }));
    const [[replyArg]] = interaction.reply.mock.calls;
    expect(replyArg.content).toBeUndefined();
    expect(replyArg.embeds).toBeDefined();
  });

  it('StaffAction is never queried when the non-admin gate fires', async () => {
    const sa = makeStaffAction();
    const interaction = makeInteraction({ userId: 'plain-001', memberUserId: 'other-002' });
    await handleStats(interaction, deps({ StaffAction: sa, adminIds: [] }));
    expect(sa.find).not.toHaveBeenCalled();
  });
});

// ---------------------------------------------------------------------------
// handleStats — period default (no option → 30 days)
// ---------------------------------------------------------------------------

describe('handleStats — period default', () => {
  it('uses a 30-day cutoff when no period option is given', async () => {
    const { sa, getFilter } = captureStaffAction();
    const interaction = makeInteraction();
    await handleStats(interaction, { StaffAction: sa, now: () => NOW_MS, adminIds: [] });
    const expectedCutoff = new Date(NOW_MS - 30 * MS_PER_DAY);
    expect(getFilter().createdAt.$gte.getTime()).toBe(expectedCutoff.getTime());
  });

  it('embed title includes "30 days" when no period option', async () => {
    const interaction = makeInteraction();
    await handleStats(interaction, deps());
    const [[replyArg]] = interaction.reply.mock.calls;
    expect(replyArg.embeds[0].data.title).toContain('30 days');
  });

  it('embed title includes the user-supplied period label', async () => {
    const interaction = makeInteraction({ periodStr: '7 days' });
    await handleStats(interaction, deps());
    const [[replyArg]] = interaction.reply.mock.calls;
    expect(replyArg.embeds[0].data.title).toContain('7 days');
  });
});

// ---------------------------------------------------------------------------
// handleStats — source filter passthrough
// ---------------------------------------------------------------------------

describe('handleStats — source filter', () => {
  it('source="email" counts only email events', async () => {
    const events = [
      { staffId: 'caller-001', type: 'claim', tier: 0, ticketType: 'email',   resolverId: null, toId: null, fromId: null },
      { staffId: 'caller-001', type: 'claim', tier: 0, ticketType: 'discord', resolverId: null, toId: null, fromId: null }
    ];
    const sa = { find: () => ({ lean: () => Promise.resolve(events) }) };
    const interaction = makeInteraction({ source: 'email' });
    await handleStats(interaction, { StaffAction: sa, now: () => NOW_MS, adminIds: [] });
    const [[replyArg]] = interaction.reply.mock.calls;
    const claimsField = replyArg.embeds[0].data.fields.find(f => f.name === 'Claims');
    // Only 1 email claim should be counted
    expect(claimsField.value).toMatch(/^1/);
  });

  it('source label appears in embed description', async () => {
    const interaction = makeInteraction({ source: 'discord' });
    await handleStats(interaction, deps());
    const [[replyArg]] = interaction.reply.mock.calls;
    expect(replyArg.embeds[0].data.description).toContain('discord');
  });

  it('omitted source defaults to "all" and shows "all sources" in description', async () => {
    const interaction = makeInteraction();
    await handleStats(interaction, deps());
    const [[replyArg]] = interaction.reply.mock.calls;
    expect(replyArg.embeds[0].data.description).toContain('all sources');
  });
});

// ---------------------------------------------------------------------------
// handleStats — StaffAction query filter shape
// ---------------------------------------------------------------------------

describe('handleStats — query filter shape', () => {
  it('$or includes all 4 target fields', async () => {
    const { sa, getFilter } = captureStaffAction();
    const interaction = makeInteraction({ userId: 'user-001' });
    await handleStats(interaction, { StaffAction: sa, now: () => NOW_MS, adminIds: [] });

    expect(getFilter().$or).toHaveLength(4);
    expect(getFilter().$or).toContainEqual({ staffId: 'user-001' });
    expect(getFilter().$or).toContainEqual({ resolverId: 'user-001' });
    expect(getFilter().$or).toContainEqual({ toId: 'user-001' });
    expect(getFilter().$or).toContainEqual({ fromId: 'user-001' });
  });

  it('createdAt.$gte is a Date instance', async () => {
    const { sa, getFilter } = captureStaffAction();
    const interaction = makeInteraction();
    await handleStats(interaction, { StaffAction: sa, now: () => NOW_MS, adminIds: [] });
    expect(getFilter().createdAt.$gte).toBeInstanceOf(Date);
  });

  it('admin querying another member uses member id (not admin id) in $or', async () => {
    const { sa, getFilter } = captureStaffAction();
    const interaction = makeInteraction({ userId: 'admin-001', memberUserId: 'other-002' });
    await handleStats(interaction, { StaffAction: sa, now: () => NOW_MS, adminIds: ['admin-001'] });
    expect(getFilter().$or).toContainEqual({ staffId: 'other-002' });
    expect(getFilter().$or).not.toContainEqual({ staffId: 'admin-001' });
  });
});

// ---------------------------------------------------------------------------
// handleStats — embed output reflects shapeStats with tier labels
// ---------------------------------------------------------------------------

describe('handleStats — embed content', () => {
  it('reply is ephemeral', async () => {
    const interaction = makeInteraction();
    await handleStats(interaction, deps());
    const [[replyArg]] = interaction.reply.mock.calls;
    expect(replyArg.flags).toBe(MessageFlags.Ephemeral);
  });

  it('embed title contains the target username', async () => {
    const interaction = makeInteraction({ userId: 'caller-001' }); // username = 'testuser'
    await handleStats(interaction, deps());
    const [[replyArg]] = interaction.reply.mock.calls;
    expect(replyArg.embeds[0].data.title).toContain('testuser');
  });

  it('escalations field maps tier 1 → "Tier 2" and tier 2 → "Tier 3"', async () => {
    const events = [
      { staffId: 'caller-001', type: 'escalate', tier: 1, ticketType: 'email', resolverId: null, toId: null, fromId: null },
      { staffId: 'caller-001', type: 'escalate', tier: 2, ticketType: 'email', resolverId: null, toId: null, fromId: null }
    ];
    const sa = { find: () => ({ lean: () => Promise.resolve(events) }) };
    const interaction = makeInteraction();
    await handleStats(interaction, { StaffAction: sa, now: () => NOW_MS, adminIds: [] });
    const [[replyArg]] = interaction.reply.mock.calls;
    const field = replyArg.embeds[0].data.fields.find(f => f.name === 'Escalations');
    expect(field.value).toContain('Tier 2');
    expect(field.value).toContain('Tier 3');
  });

  it('de-escalations field maps tier 1 → "Tier 2" and tier 2 → "Tier 3"', async () => {
    const events = [
      { staffId: 'caller-001', type: 'deescalate', tier: 1, ticketType: 'email', resolverId: null, toId: null, fromId: null },
      { staffId: 'caller-001', type: 'deescalate', tier: 2, ticketType: 'email', resolverId: null, toId: null, fromId: null }
    ];
    const sa = { find: () => ({ lean: () => Promise.resolve(events) }) };
    const interaction = makeInteraction();
    await handleStats(interaction, { StaffAction: sa, now: () => NOW_MS, adminIds: [] });
    const [[replyArg]] = interaction.reply.mock.calls;
    const field = replyArg.embeds[0].data.fields.find(f => f.name === 'De-escalations');
    expect(field.value).toContain('Tier 2');
    expect(field.value).toContain('Tier 3');
  });

  it('claims-while-escalated sub-breakdown uses tier labels in Claims field', async () => {
    const events = [
      { staffId: 'caller-001', type: 'claim', tier: 1, ticketType: 'email', resolverId: null, toId: null, fromId: null },
      { staffId: 'caller-001', type: 'claim', tier: 2, ticketType: 'email', resolverId: null, toId: null, fromId: null }
    ];
    const sa = { find: () => ({ lean: () => Promise.resolve(events) }) };
    const interaction = makeInteraction();
    await handleStats(interaction, { StaffAction: sa, now: () => NOW_MS, adminIds: [] });
    const [[replyArg]] = interaction.reply.mock.calls;
    const field = replyArg.embeds[0].data.fields.find(f => f.name === 'Claims');
    expect(field.value).toContain('Tier 2');
    expect(field.value).toContain('Tier 3');
  });

  it('empty stats returns a valid zero-filled embed without throwing', async () => {
    const interaction = makeInteraction();
    await handleStats(interaction, deps());
    const [[replyArg]] = interaction.reply.mock.calls;
    expect(replyArg.embeds).toHaveLength(1);
    const claimsField = replyArg.embeds[0].data.fields.find(f => f.name === 'Claims');
    expect(claimsField.value).toMatch(/^0/);
    const escalField = replyArg.embeds[0].data.fields.find(f => f.name === 'Escalations');
    expect(escalField.value).toBe('0');
  });

  it('Email / Discord split field reflects bySource from shapeStats', async () => {
    const events = [
      { staffId: 'caller-001', type: 'claim', tier: 0, ticketType: 'email',   resolverId: null, toId: null, fromId: null },
      { staffId: 'caller-001', type: 'claim', tier: 0, ticketType: 'discord', resolverId: null, toId: null, fromId: null }
    ];
    const sa = { find: () => ({ lean: () => Promise.resolve(events) }) };
    const interaction = makeInteraction();
    await handleStats(interaction, { StaffAction: sa, now: () => NOW_MS, adminIds: [] });
    const [[replyArg]] = interaction.reply.mock.calls;
    const splitField = replyArg.embeds[0].data.fields.find(f => f.name === 'Email / Discord split');
    expect(splitField.value).toContain('Email');
    expect(splitField.value).toContain('Discord');
  });
});