/**
 * Tests for movement lineage validation (run before / with the service module).
 *   node --test server/__tests__/movement-lineage-service.test.js
 */
const { describe, it } = require('node:test');
const assert = require('node:assert/strict');
const {
  isValidProofUrl,
  validateCreatePayload,
  validateDeleteVotePayload,
  DEFAULT_MOVEMENT_LINEAGE,
} = require('../movement-lineage-service');

describe('isValidProofUrl', () => {
  it('accepts http and https URLs', () => {
    assert.equal(isValidProofUrl('https://www.metmuseum.org/toah/hd/byza/hd_byza.htm'), true);
    assert.equal(isValidProofUrl('http://example.com/essay'), true);
  });

  it('rejects empty, non-http, and garbage', () => {
    assert.equal(isValidProofUrl(''), false);
    assert.equal(isValidProofUrl('   '), false);
    assert.equal(isValidProofUrl(null), false);
    assert.equal(isValidProofUrl('ftp://files.example/a'), false);
    assert.equal(isValidProofUrl('not-a-url'), false);
    assert.equal(isValidProofUrl('www.metmuseum.org/page'), false);
  });
});

describe('validateCreatePayload', () => {
  it('requires source, target, and proof URL', () => {
    const r = validateCreatePayload({});
    assert.equal(r.ok, false);
    assert.match(r.error, /sourceMovementId/i);
  });

  it('rejects same source and target', () => {
    const r = validateCreatePayload({
      sourceMovementId: 3,
      targetMovementId: 3,
      proofUrl: 'https://www.theartstory.org/movement/cubism/',
    });
    assert.equal(r.ok, false);
    assert.match(r.error, /different/i);
  });

  it('requires a valid proof URL', () => {
    const r = validateCreatePayload({
      sourceMovementId: 1,
      targetMovementId: 2,
      proofUrl: 'see Wikipedia',
    });
    assert.equal(r.ok, false);
    assert.match(r.error, /proof/i);
  });

  it('accepts a valid payload and normalizes fields', () => {
    const r = validateCreatePayload({
      sourceMovementId: '10',
      targetMovementId: 20,
      proofUrl: '  https://www.metmuseum.org/essays/cubism  ',
      proofLabel: '  Met Cubism  ',
      linkYearApprox: '1907',
      notes: ' Cézanne → Picasso ',
    });
    assert.equal(r.ok, true);
    assert.deepEqual(r.value, {
      sourceMovementId: 10,
      targetMovementId: 20,
      proofUrl: 'https://www.metmuseum.org/essays/cubism',
      proofLabel: 'Met Cubism',
      linkYearApprox: 1907,
      notes: 'Cézanne → Picasso',
    });
  });

  it('allows null optional year and blank optional label/notes', () => {
    const r = validateCreatePayload({
      sourceMovementId: 1,
      targetMovementId: 2,
      proofUrl: 'https://example.org/a',
      proofLabel: '',
      linkYearApprox: '',
      notes: null,
    });
    assert.equal(r.ok, true);
    assert.equal(r.value.proofLabel, null);
    assert.equal(r.value.linkYearApprox, null);
    assert.equal(r.value.notes, null);
  });
});

describe('validateDeleteVotePayload', () => {
  it('requires a non-empty reason', () => {
    assert.equal(validateDeleteVotePayload({}).ok, false);
    assert.equal(validateDeleteVotePayload({ reason: '  ' }).ok, false);
    assert.match(validateDeleteVotePayload({ reason: '' }).error, /reason/i);
  });

  it('rejects reasons that are too short', () => {
    const r = validateDeleteVotePayload({ reason: 'no' });
    assert.equal(r.ok, false);
    assert.match(r.error, /reason/i);
  });

  it('accepts and trims a valid reason', () => {
    const r = validateDeleteVotePayload({
      reason: '  Incorrect lineage: Cubism did not derive from Fauvism.  ',
    });
    assert.equal(r.ok, true);
    assert.equal(r.value.reason, 'Incorrect lineage: Cubism did not derive from Fauvism.');
  });
});

describe('DEFAULT_MOVEMENT_LINEAGE', () => {
  it('has unique source→target pairs with proof URLs', () => {
    assert.ok(DEFAULT_MOVEMENT_LINEAGE.length >= 20);
    const keys = new Set();
    for (const row of DEFAULT_MOVEMENT_LINEAGE) {
      assert.ok(row.sourceName);
      assert.ok(row.targetName);
      assert.notEqual(row.sourceName, row.targetName);
      assert.equal(isValidProofUrl(row.proofUrl), true, row.proofUrl);
      const key = `${row.sourceName}→${row.targetName}`;
      assert.equal(keys.has(key), false, `duplicate ${key}`);
      keys.add(key);
    }
  });
});