/**
 * Node built-in test runner for pure strategy cascade model.
 * Mirrors strategyCascadeModel.ts logic (kept small + isolated).
 * Run: node --test src/components/company/strategyCascadeModel.node-test.mjs
 */
import { describe, it } from 'node:test';
import assert from 'node:assert/strict';

const CANONICAL_CASCADE_ORDER = [
  'tax_psi_ulgi',
  'regional_fst',
  'national_feng',
  'debt_loan_guarantee',
  'direct_eu_prep',
];

function normalizeStrategyResult(raw) {
  const empty = {
    paths: [],
    primaryPathId: null,
    recommendedPathIds: [],
    deMinimisExhausted: false,
    mspStatus: null,
    deMinimisUsedEur: null,
    notes: [],
    cascadeOrder: [...CANONICAL_CASCADE_ORDER],
  };
  if (!raw || typeof raw !== 'object') return empty;

  const pathsIn = Array.isArray(raw.paths) ? raw.paths : [];
  const paths = pathsIn
    .filter((p) => p && typeof p === 'object')
    .map((p) => {
      const checklistIds = Array.isArray(p.checklist_ids)
        ? p.checklist_ids.map(String).filter(Boolean)
        : undefined;
      const view = {
        id: String(p.id || ''),
        label: String(p.label || p.id || 'Ścieżka'),
        score: Number(p.score) || 0,
        reasons: Array.isArray(p.reasons) ? p.reasons.map(String).filter(Boolean) : [],
        primary: Boolean(p.primary),
        de_minimis_blocked: Boolean(p.de_minimis_blocked),
      };
      if (checklistIds && checklistIds.length > 0) {
        view.checklist_ids = checklistIds;
      }
      if (p.checklist_id != null && p.checklist_id !== '') {
        view.checklist_id = String(p.checklist_id);
      } else if (checklistIds && checklistIds.length > 0) {
        view.checklist_id = checklistIds[0];
      }
      if (p.never_say_submit_to_parp != null) {
        view.never_say_submit_to_parp = Boolean(p.never_say_submit_to_parp);
      }
      return view;
    })
    .filter((p) => p.id);

  paths.sort((a, b) => b.score - a.score);

  const primaryFromFlag = paths.find((p) => p.primary)?.id ?? null;
  const primaryPathId =
    (typeof raw.primary_path_id === 'string' && raw.primary_path_id) || primaryFromFlag;

  if (primaryPathId) {
    for (const p of paths) {
      p.primary = p.id === primaryPathId && !p.de_minimis_blocked;
    }
    if (!paths.some((p) => p.primary)) {
      const fallback = paths.find((p) => !p.de_minimis_blocked);
      if (fallback) fallback.primary = true;
    }
  }

  const rec = Array.isArray(raw.recommended_paths) ? raw.recommended_paths : [];
  const recommendedPathIds = rec
    .map((p) => (p && typeof p === 'object' ? String(p.id || '') : ''))
    .filter(Boolean);

  const elig =
    raw.eligibility_summary && typeof raw.eligibility_summary === 'object'
      ? raw.eligibility_summary
      : {};

  return {
    paths,
    primaryPathId: paths.find((p) => p.primary)?.id ?? primaryPathId,
    recommendedPathIds:
      recommendedPathIds.length > 0
        ? recommendedPathIds
        : paths.filter((p) => !p.de_minimis_blocked).slice(0, 4).map((p) => p.id),
    deMinimisExhausted: Boolean(elig.de_minimis_exhausted),
    mspStatus: elig.msp != null ? String(elig.msp) : null,
    deMinimisUsedEur:
      typeof elig.de_minimis_used_eur === 'number' ? elig.de_minimis_used_eur : null,
    notes: Array.isArray(raw.notes) ? raw.notes.map(String) : [],
    cascadeOrder: Array.isArray(raw.cascade_order)
      ? raw.cascade_order.map(String)
      : [...CANONICAL_CASCADE_ORDER],
  };
}

function formatScore(score) {
  if (!Number.isFinite(score)) return '—';
  return Math.round(score).toString();
}

function isBlockedPath(path) {
  return Boolean(path.de_minimis_blocked);
}

const TAX_CHECKLIST_LABELS = {
  psi: 'PSI',
  ulga_br: 'Ulga B+R',
  ip_box: 'IP Box',
};

function formatTaxChecklistId(id) {
  return TAX_CHECKLIST_LABELS[id] || id;
}

function hasTaxChecklists(path) {
  return Array.isArray(path.checklist_ids) && path.checklist_ids.length > 0;
}

/**
 * Mirror of strategyCascadeModel.resolveAutoSelectedPath
 */
function resolveAutoSelectedPath(view, currentSelected, userHasPicked) {
  if (userHasPicked && currentSelected) {
    const still = view.paths.find(
      (p) => p.id === currentSelected && !isBlockedPath(p),
    );
    if (still) return null;
  }
  if (currentSelected) {
    const still = view.paths.find(
      (p) => p.id === currentSelected && !isBlockedPath(p),
    );
    if (still && !userHasPicked) {
      return null;
    }
  }
  const primary =
    view.paths.find((p) => p.primary && !isBlockedPath(p)) ||
    view.paths.find((p) => p.id === view.primaryPathId && !isBlockedPath(p)) ||
    view.paths.find((p) => !isBlockedPath(p));
  if (!primary) return null;
  if (primary.id === currentSelected) return null;
  return primary;
}

describe('normalizeStrategyResult', () => {
  it('returns empty for null', () => {
    const v = normalizeStrategyResult(null);
    assert.equal(v.paths.length, 0);
    assert.equal(v.primaryPathId, null);
  });

  it('keeps ≥4 paths and marks primary non-blocked', () => {
    const v = normalizeStrategyResult({
      paths: [
        { id: 'tax_psi_ulgi', label: 'Tax', score: 55, primary: false },
        { id: 'regional_fst', label: 'Region', score: 70, primary: true },
        { id: 'national_feng', label: 'FENG', score: 60, primary: false },
        {
          id: 'debt_loan_guarantee',
          label: 'Debt',
          score: 80,
          primary: false,
          de_minimis_blocked: true,
        },
        { id: 'direct_eu_prep', label: 'EU', score: 40, primary: false },
      ],
      primary_path_id: 'regional_fst',
      recommended_paths: [
        { id: 'regional_fst' },
        { id: 'national_feng' },
        { id: 'tax_psi_ulgi' },
        { id: 'direct_eu_prep' },
      ],
      eligibility_summary: { de_minimis_exhausted: true, msp: 'srednia' },
    });
    assert.ok(v.paths.length >= 4);
    assert.equal(v.primaryPathId, 'regional_fst');
    assert.equal(v.paths.find((p) => p.id === 'regional_fst')?.primary, true);
    assert.equal(v.paths.find((p) => p.id === 'debt_loan_guarantee')?.de_minimis_blocked, true);
    assert.equal(v.deMinimisExhausted, true);
    // blocked path still visible (sorted by score first)
    assert.equal(v.paths[0].id, 'debt_loan_guarantee');
    assert.ok(v.recommendedPathIds.includes('regional_fst'));
  });

  it('does not mark blocked path as primary even if API says so', () => {
    const v = normalizeStrategyResult({
      paths: [
        { id: 'debt_loan_guarantee', label: 'Debt', score: 90, primary: true, de_minimis_blocked: true },
        { id: 'tax_psi_ulgi', label: 'Tax', score: 50, primary: false },
        { id: 'regional_fst', label: 'R', score: 48 },
        { id: 'national_feng', label: 'F', score: 47 },
      ],
      primary_path_id: 'debt_loan_guarantee',
    });
    assert.notEqual(v.primaryPathId, 'debt_loan_guarantee');
    assert.equal(v.paths.find((p) => p.id === 'debt_loan_guarantee')?.primary, false);
    assert.ok(v.paths.some((p) => p.primary && !p.de_minimis_blocked));
  });

  it('passes through tax checklist_ids and never_say_submit_to_parp', () => {
    const v = normalizeStrategyResult({
      paths: [
        {
          id: 'tax_psi_ulgi',
          label: 'Podatki / PSI / ulgi',
          score: 75,
          primary: true,
          checklist_ids: ['psi', 'ulga_br', 'ip_box'],
          checklist_id: 'psi',
          never_say_submit_to_parp: true,
        },
        { id: 'regional_fst', label: 'Region', score: 50 },
        { id: 'national_feng', label: 'FENG', score: 48 },
        { id: 'debt_loan_guarantee', label: 'Debt', score: 40 },
      ],
      primary_path_id: 'tax_psi_ulgi',
    });
    const tax = v.paths.find((p) => p.id === 'tax_psi_ulgi');
    assert.ok(tax);
    assert.deepEqual(tax.checklist_ids, ['psi', 'ulga_br', 'ip_box']);
    assert.equal(tax.checklist_id, 'psi');
    assert.equal(tax.never_say_submit_to_parp, true);
    assert.equal(hasTaxChecklists(tax), true);
    assert.equal(hasTaxChecklists(v.paths.find((p) => p.id === 'regional_fst')), false);
    assert.equal(formatTaxChecklistId('psi'), 'PSI');
    assert.equal(formatTaxChecklistId('ulga_br'), 'Ulga B+R');
    assert.equal(formatTaxChecklistId('ip_box'), 'IP Box');
  });

  it('defaults checklist_id from first checklist_ids entry', () => {
    const v = normalizeStrategyResult({
      paths: [
        {
          id: 'tax_psi_ulgi',
          label: 'Tax',
          score: 60,
          checklist_ids: ['psi', 'ulga_br', 'ip_box'],
        },
        { id: 'regional_fst', label: 'R', score: 50 },
        { id: 'national_feng', label: 'F', score: 48 },
        { id: 'debt_loan_guarantee', label: 'D', score: 40 },
      ],
    });
    const tax = v.paths.find((p) => p.id === 'tax_psi_ulgi');
    assert.equal(tax.checklist_id, 'psi');
  });
});

describe('formatScore', () => {
  it('rounds finite scores', () => {
    assert.equal(formatScore(55.4), '55');
    assert.equal(formatScore(55.6), '56');
  });
  it('handles non-finite', () => {
    assert.equal(formatScore(NaN), '—');
  });
});

describe('resolveAutoSelectedPath', () => {
  const baseView = () =>
    normalizeStrategyResult({
      paths: [
        { id: 'regional_fst', label: 'Region', score: 70, primary: true },
        { id: 'national_feng', label: 'FENG', score: 60, primary: false },
        { id: 'tax_psi_ulgi', label: 'Tax', score: 55, primary: false },
        {
          id: 'debt_loan_guarantee',
          label: 'Debt',
          score: 80,
          de_minimis_blocked: true,
        },
        { id: 'direct_eu_prep', label: 'EU', score: 40, primary: false },
      ],
      primary_path_id: 'regional_fst',
    });

  it('auto-picks primary when nothing selected', () => {
    const v = baseView();
    const auto = resolveAutoSelectedPath(v, null, false);
    assert.ok(auto);
    assert.equal(auto.id, 'regional_fst');
    assert.equal(auto.primary, true);
  });

  it('does not re-notify when parent already holds primary', () => {
    const v = baseView();
    const auto = resolveAutoSelectedPath(v, 'regional_fst', false);
    assert.equal(auto, null);
  });

  it('keeps user pick when still valid', () => {
    const v = baseView();
    const auto = resolveAutoSelectedPath(v, 'national_feng', true);
    assert.equal(auto, null);
  });

  it('falls back when user pick is blocked', () => {
    const v = baseView();
    const auto = resolveAutoSelectedPath(v, 'debt_loan_guarantee', true);
    assert.ok(auto);
    assert.equal(auto.id, 'regional_fst');
  });

  it('never auto-selects de_minimis_blocked path', () => {
    const v = normalizeStrategyResult({
      paths: [
        {
          id: 'debt_loan_guarantee',
          label: 'Debt',
          score: 99,
          primary: true,
          de_minimis_blocked: true,
        },
        { id: 'tax_psi_ulgi', label: 'Tax', score: 50 },
        { id: 'regional_fst', label: 'R', score: 48 },
        { id: 'national_feng', label: 'F', score: 47 },
      ],
      primary_path_id: 'debt_loan_guarantee',
    });
    const auto = resolveAutoSelectedPath(v, null, false);
    assert.ok(auto);
    assert.notEqual(auto.id, 'debt_loan_guarantee');
    assert.equal(auto.de_minimis_blocked, false);
  });
});