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'});

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);
 }
});

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');
});

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));
});

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');
});