/**
 * Tests for #1762 — `computeBackupGroups` strict identity rule.
 *
 * Slots pair ONLY when they share the same Bambu preset ID
 * (`tray_info_idx`). User-tagged spools without a preset never pair.
 * Empty slots are skipped; non-empty slots without a peer come back as
 * 1-member entries so the modal can list them as "Slots without a peer".
 */
import { describe, it, expect } from 'vitest';

import { computeBackupGroups } from '../../utils/amsHelpers';

function ams(id: number, tray: Array<{
  tray_type?: string | null;
  tray_sub_brands?: string | null;
  tray_color?: string | null;
  tray_info_idx?: string | null;
}>) {
  return {
    id,
    tray: tray.map((t, i) => ({
      id: i,
      tray_type: t.tray_type ?? null,
      tray_sub_brands: t.tray_sub_brands ?? null,
      tray_color: t.tray_color ?? null,
      tray_info_idx: t.tray_info_idx ?? null,
    })),
  };
}

describe('computeBackupGroups', () => {
  it('returns empty list for missing/empty AMS input', () => {
    expect(computeBackupGroups(undefined, {}, false)).toEqual([]);
    expect(computeBackupGroups([], {}, false)).toEqual([]);
  });

  it('skips empty slots entirely', () => {
    const groups = computeBackupGroups(
      [ams(0, [
        { tray_type: null, tray_color: null, tray_info_idx: null },
        { tray_type: null, tray_color: null, tray_info_idx: null },
      ])],
      {},
      false,
    );
    expect(groups).toEqual([]);
  });

  it('groups two slots in different AMS units holding the same preset', () => {
    const groups = computeBackupGroups(
      [
        ams(0, [{ tray_type: 'PLA', tray_color: '#000000', tray_info_idx: 'GFA00' }]),
        ams(1, [{ tray_type: 'PLA', tray_color: '#000000', tray_info_idx: 'GFA00' }]),
      ],
      {},
      false,
    );

    expect(groups).toHaveLength(1);
    expect(groups[0].presetId).toBe('GFA00');
    expect(groups[0].members.map((m) => m.globalTrayId)).toEqual([0, 4]);
  });

  it('STRICT rule: two slots without a preset never pair, even with matching material+colour', () => {
    const groups = computeBackupGroups(
      [
        ams(0, [{ tray_type: 'PLA', tray_sub_brands: 'PLA Basic', tray_color: '#FF0000' }]),
        ams(1, [{ tray_type: 'PLA', tray_sub_brands: 'PLA Basic', tray_color: '#FF0000' }]),
      ],
      {},
      false,
    );

    // Two lone slots — no pair.
    expect(groups).toHaveLength(2);
    expect(groups.every((g) => g.members.length === 1)).toBe(true);
    expect(groups.every((g) => g.presetId === null)).toBe(true);
  });

  it('does NOT group slots with different presets even if same material', () => {
    const groups = computeBackupGroups(
      [ams(0, [
        { tray_type: 'PLA', tray_color: '#000000', tray_info_idx: 'GFA00' },
        { tray_type: 'PLA', tray_color: '#FFFFFF', tray_info_idx: 'GFA01' },
      ])],
      {},
      false,
    );
    expect(groups).toHaveLength(2);
    expect(groups.every((g) => g.members.length === 1)).toBe(true);
  });

  it('returns lone slots alongside pairs in the same list', () => {
    const groups = computeBackupGroups(
      [
        ams(0, [
          { tray_type: 'PLA', tray_color: '#000000', tray_info_idx: 'GFA00' },
          { tray_type: 'PETG', tray_color: '#0000FF', tray_info_idx: 'GFG99' },
        ]),
        ams(1, [{ tray_type: 'PLA', tray_color: '#000000', tray_info_idx: 'GFA00' }]),
      ],
      {},
      false,
    );
    // 1 pair + 1 lone, pair first by sort order.
    expect(groups).toHaveLength(2);
    expect(groups[0].members).toHaveLength(2);
    expect(groups[1].members).toHaveLength(1);
    expect(groups[1].displayName).toContain('PETG');
  });

  it('on dual-extruder printers, scopes pairs per extruder side', () => {
    // ams 0 = right (0), ams 1 = left (1). Same preset on different sides:
    // each comes back as a 1-member entry.
    const groups = computeBackupGroups(
      [
        ams(0, [{ tray_type: 'PLA', tray_color: '#000000', tray_info_idx: 'GFA00' }]),
        ams(1, [{ tray_type: 'PLA', tray_color: '#000000', tray_info_idx: 'GFA00' }]),
      ],
      { '0': 0, '1': 1 },
      true,
    );
    expect(groups).toHaveLength(2);
    expect(groups.every((g) => g.members.length === 1)).toBe(true);
    expect(groups[0].extruder).toBe(0);
    expect(groups[1].extruder).toBe(1);
  });

  it('on dual-extruder printers, pairs slots on the same extruder side', () => {
    const groups = computeBackupGroups(
      [
        ams(0, [{ tray_type: 'PLA', tray_color: '#000000', tray_info_idx: 'GFA00' }]),
        ams(1, [{ tray_type: 'PLA', tray_color: '#000000', tray_info_idx: 'GFA00' }]),
        ams(2, [{ tray_type: 'PLA', tray_color: '#000000', tray_info_idx: 'GFA00' }]),
      ],
      { '0': 0, '1': 1, '2': 0 },
      true,
    );

    // Right-side pair (AMS 0 + 2), left-side lone (AMS 1).
    const rightPair = groups.find((g) => g.extruder === 0 && g.members.length === 2);
    expect(rightPair).toBeDefined();
    expect(rightPair!.members.map((m) => m.globalTrayId).sort((a, b) => a - b)).toEqual([0, 8]);
    const leftLone = groups.find((g) => g.extruder === 1);
    expect(leftLone).toBeDefined();
    expect(leftLone!.members).toHaveLength(1);
  });

  it('handles AMS-HT (single-tray, id >= 128) via getGlobalTrayId — pairs with regular AMS slot', () => {
    const groups = computeBackupGroups(
      [
        ams(0, [{ tray_type: 'PLA', tray_color: '#000000', tray_info_idx: 'GFA00' }]),
        ams(128, [{ tray_type: 'PLA', tray_color: '#000000', tray_info_idx: 'GFA00' }]),
      ],
      {},
      false,
    );
    expect(groups).toHaveLength(1);
    expect(groups[0].members.map((m) => m.globalTrayId).sort((a, b) => a - b)).toEqual([0, 128]);
  });

  it('STRICT colour rule: same preset, different colours do NOT pair', () => {
    // Reporter screenshot scenario — three PETG HF slots all sharing the
    // same Bambu profile ID (e.g. GFG99) but in three different colours
    // cannot back each other up; the firmware would correctly swap PETG HF
    // but the print would change colour mid-run.
    const groups = computeBackupGroups(
      [
        ams(0, [{ tray_type: 'PETG', tray_color: '#000000', tray_info_idx: 'GFG99' }]),
        ams(1, [{ tray_type: 'PETG', tray_color: '#FF0000', tray_info_idx: 'GFG99' }]),
        ams(2, [{ tray_type: 'PETG', tray_color: '#00FF00', tray_info_idx: 'GFG99' }]),
      ],
      {},
      false,
    );
    // Three lone slots — no pair.
    expect(groups).toHaveLength(3);
    expect(groups.every((g) => g.members.length === 1)).toBe(true);
  });

  it('colour normalisation: 6-char and 8-char hex of the same RGB pair correctly', () => {
    const groups = computeBackupGroups(
      [
        ams(0, [{ tray_type: 'PLA', tray_color: '000000', tray_info_idx: 'GFA00' }]),
        ams(1, [{ tray_type: 'PLA', tray_color: '000000FF', tray_info_idx: 'GFA00' }]),
      ],
      {},
      false,
    );
    expect(groups).toHaveLength(1);
    expect(groups[0].members).toHaveLength(2);
  });

  it('defensively dedupes duplicate ams.id entries (first wins)', () => {
    // Observed in the wild: status.ams sometimes contains the same ams.id
    // twice (VP-aggregated switch printers, MQTT partial-update edge cases).
    // The modal must NOT render the same slot label with conflicting
    // materials — first occurrence wins, second is dropped.
    const groups = computeBackupGroups(
      [
        ams(0, [{ tray_type: 'PETG', tray_color: '#000000', tray_info_idx: 'GFG99' }]),
        ams(0, [{ tray_type: 'PLA', tray_color: '#000000', tray_info_idx: 'GFA00' }]),
      ],
      {},
      false,
    );
    expect(groups).toHaveLength(1);
    expect(groups[0].displayName).toContain('PETG');
  });

  it('preserves display name + tray colour from the first slot for the modal swatch', () => {
    const groups = computeBackupGroups(
      [
        ams(0, [{ tray_type: 'PLA', tray_sub_brands: 'PLA Basic', tray_color: '#1A1A1A', tray_info_idx: 'GFA00' }]),
        ams(1, [{ tray_type: 'PLA', tray_sub_brands: 'PLA Basic', tray_color: '#1A1A1A', tray_info_idx: 'GFA00' }]),
      ],
      {},
      false,
    );
    expect(groups[0].displayName).toBe('PLA Basic');
    expect(groups[0].trayColor).toBe('#1A1A1A');
  });
});