import test from 'node:test';
import assert from 'node:assert/strict';
import fs from 'node:fs';
import {
    newImportExemption,
    evaluateImportExemption,
    recordImportExemptions,
    saveImportExemptionBook,
    importExemptionBook,
    importExemptionCurrent,
    importExemptionRules,
    importDevelopmentSource,
    importDevelopmentFields,
} from '../../resources/js/lib/iva-import-exemptions.ts';
import { createProjectDossierReport } from '../../resources/js/lib/project-dossier-report.ts';
const frozen = JSON.parse(
    fs.readFileSync(
        new URL('./fixtures/iva-g6h-preserved-inputs.json', import.meta.url),
        'utf8',
    ),
);
const rules = importExemptionRules.filter((r) => r.branch === 'P060');
const row = (rule) => ({
    ...newImportExemption('g6h-' + rule.id, 'MZN'),
    treatment: rule.id,
    description: 'SYNTHETIC QA materiais/equipamentos projecto ONU',
    period: '2026-12',
    declaredValue: '5000',
    importer: 'SYNTHETIC QA entidade promotora',
    documentRef: 'SYNTHETIC QA G6H ' + rule.id,
    documentDate: '2026-11-14',
    evidence:
        'SYNTHETIC QA pressupostos expressos; concessão aduaneira no plano e lista aprovada; não documento real',
    ...Object.fromEntries(
        importDevelopmentFields.map(([key, label]) => [
            key,
            'SYNTHETIC QA ' +
                label +
                ';operação2026-12/bens A;pressuposto expresso',
        ]),
    ),
    ...(rule.id === 'un_development_reduction'
        ? {
              developmentReductionPercent: '50',
              developmentNormalVat: '800',
              developmentNormalVatRef:
                  'SYNTHETIC QA IVA sem benefício informado, não calculado da base pelo portal',
          }
        : {}),
    conditions: Object.fromEntries(
        rule.conditions.map(([key]) => [key, 'yes']),
    ),
});
const draft = () => ({
    ...structuredClone(frozen),
    context_opportunity: 'opportunity:338',
    project_title: 'SYNTHETIC QA — G6H / Projecto de desenvolvimento',
});

void test('P060 own funding,accreditation,destination,decision,list/plan and customs conditions;unknown/no never produce exempt zero', () => {
    assert.equal(rules.length, 2);
    assert.match(importDevelopmentSource, /12\(4\)/);
    for (const rule of rules) {
        const input = row(rule),
            ok = evaluateImportExemption(input, 'MZN');
        assert.equal(
            ok.importVat,
            rule.id === 'un_development_exemption' ? '0.00' : '400.00',
        );
        assert.equal(
            ok.status,
            rule.id === 'un_development_exemption' ? 'exempt' : 'reduced',
        );
        assert.equal(ok.serviceVat, undefined);
        for (const [key] of rule.conditions)
            for (const value of ['', 'unknown', 'no']) {
                const r = evaluateImportExemption(
                    {
                        ...input,
                        conditions: { ...input.conditions, [key]: value },
                    },
                    'MZN',
                );
                assert.equal(
                    r.status,
                    value === 'no' ? 'not_applicable' : 'indeterminate',
                );
                assert.equal(r.importVat, null);
            }
        for (const [key] of importDevelopmentFields)
            assert.equal(
                evaluateImportExemption({ ...input, [key]: '' }, 'MZN')
                    .importVat,
                null,
            );
        for (const patch of [
            { period: '2025-12' },
            { documentDate: '2026-02-30' },
            { currency: 'USD' },
            { documentRef: '' },
            { evidence: '' },
        ])
            assert.equal(
                evaluateImportExemption({ ...input, ...patch }, 'MZN')
                    .importVat,
                null,
            );
    }
});

void test('partial benefit is exact proportion of supplied VAT,not a VAT/customs rate or full exemption;missing is not zero', () => {
    const input = row(rules[1]);
    for (const [normal, percent, expected] of [
        ['800', '25', '600.00'],
        ['800', '75', '200.00'],
        ['1.234567', '33.333333', '0.82304467078189'],
        ['999999999999999.999999', '99.999999', '9999999.99999999999999'],
        ['0', '50', '0.00'],
    ]) {
        const r = evaluateImportExemption(
            {
                ...input,
                developmentNormalVat: normal,
                developmentReductionPercent: percent,
            },
            'MZN',
        );
        assert.equal(r.status, 'reduced');
        assert.equal(r.importVat, expected);
        assert.ok(!r.reason.includes('%/100'));
    }
    for (const patch of [
        { developmentReductionPercent: '' },
        { developmentReductionPercent: '-1' },
        { developmentReductionPercent: '101' },
        { developmentReductionPercent: '100' },
        { developmentReductionPercent: '0.0000001' },
        { developmentNormalVat: '' },
        { developmentNormalVat: '-1' },
        { developmentNormalVat: 'NaN' },
        { developmentNormalVatRef: '' },
    ])
        assert.equal(
            evaluateImportExemption({ ...input, ...patch }, 'MZN').importVat,
            null,
        );
    assert.equal(
        evaluateImportExemption(
            { ...input, developmentReductionPercent: '0' },
            'MZN',
        ).status,
        'not_applicable',
    );
    const full = row(rules[0]);
    assert.equal(
        evaluateImportExemption(
            {
                ...full,
                developmentNormalVat: '',
                developmentReductionPercent: '50',
            },
            'MZN',
        ).importVat,
        '0.00',
        'hidden stale partial fields do not override full-rights condition',
    );
    assert.equal(
        evaluateImportExemption({ ...full, treatment: rules[1].id }, 'MZN')
            .status,
        'indeterminate',
        'switch does not inherit own rights-reduction eligibility',
    );
});

void test('save/recovery/report keep77 delivered branches and partial P084/P085 exact;new contexts/history and reference edits isolated', () => {
    const d = draft(),
        prior = JSON.parse(d.modelo_a_snapshot);
    let book = recordImportExemptions(d, {
        rows: rules.map((rule) => ({ ...row(rule), conditions: {} })),
    });
    book = recordImportExemptions(d, {
        ...book,
        rows: rules.map((rule) => ({
            ...row(rule),
            conditions: {
                ...row(rule).conditions,
                developmentFavourableDecision: 'no',
            },
        })),
    });
    book = recordImportExemptions(d, { ...book, rows: rules.map(row) });
    assert.equal(book.history.length, 2);
    assert.ok(
        book.history.every((h) => h.rows.every((r) => r.importVat === null)),
    );
    assert.ok(importExemptionCurrent(d, book));
    assert.match(book.result.sourceKey, /import-un-development\/1/);
    for (const field of [
        'developmentDecisionRef',
        'developmentListRef',
        'developmentPlanRef',
        'developmentScope',
        'developmentRightsRef',
        'developmentReductionPercent',
        'developmentNormalVat',
    ])
        assert.ok(
            !importExemptionCurrent(d, {
                ...book,
                rows: book.rows.map((r) => ({ ...r, [field]: 'changed' })),
            }),
        );
    assert.ok(
        !importExemptionCurrent(
            { ...d, context_opportunity: 'opportunity:339' },
            book,
        ),
    );
    d.modelo_a_snapshot = saveImportExemptionBook(d, book);
    assert.deepEqual(importExemptionBook(JSON.parse(JSON.stringify(d))), book);
    const next = JSON.parse(d.modelo_a_snapshot);
    assert.deepEqual(
        { ...next, importExemptions: prior.importExemptions },
        prior,
    );
    for (const [scope, previous] of Object.entries(prior.importExemptions)) {
        assert.deepEqual(next.importExemptions[scope], previous);
        assert.ok(
            importExemptionCurrent(
                { ...d, context_opportunity: scope },
                previous,
            ),
        );
    }
    assert.equal(
        next.importExemptions['opportunity:337'].result.rows[0].importVat,
        '0.00',
    );
    assert.equal(
        next.importExemptions['opportunity:336'].result.rows[0].serviceVat,
        '0.00',
    );
    assert.equal(
        next.importExemptions['opportunity:336'].result.rows[0].importVat,
        null,
    );
    assert.equal(
        next.books['opportunity:329'].result.periods[0].fields['11'],
        null,
    );
    const report = JSON.stringify(
        createProjectDossierReport(d, {
            selectedSections: new Set(['finance']),
            version: 'QA G6H',
        }),
    );
    for (const token of [
        'P060',
        '12(2)(c)',
        '12(4)',
        '400.00',
        'opportunity:338',
        'Manica',
        '2026-12',
        'Lista discriminada aprovada',
        'Plano de importações',
        'Redução proporcional',
        'campo11',
    ])
        assert.ok(report.includes(token), token);
    if (process.env.IVA_G6H_CALCULATED)
        fs.writeFileSync(process.env.IVA_G6H_CALCULATED, JSON.stringify(d));
});

void test('optional fields retain documents when switching,while malformed references cannot overwrite saved originals', () => {
    const d = draft(),
        original = d.modelo_a_snapshot;
    for (const key of [
        ...importDevelopmentFields.map(([key]) => key),
        'developmentReductionPercent',
        'developmentNormalVat',
        'developmentNormalVatRef',
    ])
        assert.throws(
            () =>
                saveImportExemptionBook(d, {
                    rows: [{ ...row(rules[1]), [key]: 42 }],
                }),
            /Referências do projecto de desenvolvimento/,
        );
    assert.equal(d.modelo_a_snapshot, original);
    const changed = { ...row(rules[1]), treatment: 'un_development_exemption' };
    d.modelo_a_snapshot = saveImportExemptionBook(d, { rows: [changed] });
    assert.equal(
        importExemptionBook(d).rows[0].developmentReductionPercent,
        '50',
    );
    assert.equal(
        importExemptionBook(d).rows[0].developmentPlanRef,
        changed.developmentPlanRef,
    );
    assert.equal(
        evaluateImportExemption(changed, 'MZN').status,
        'indeterminate',
    );
});