/**
 * 截止日推算：依相依關係拓撲排序，任一工作包的截止日不得早於它的先決工作包。
 * 這支腳本不碰 Gitea，純算數字，所以測試只餵檔案、只看 stdout。
 */
import test from 'node:test';
import assert from 'node:assert/strict';
import { mkdtempSync, mkdirSync, writeFileSync } from 'node:fs';
import { join } from 'node:path';
import { runScript, tmpRoot } from './helpers/run-script.js';

/** 把一份排程計畫寫成暫存檔，回傳路徑 */
function writePlan(plan) {
  mkdirSync(tmpRoot, { recursive: true });
  const dir = mkdtempSync(join(tmpRoot, 'plan-'));
  const path = join(dir, 'plan.json');
  writeFileSync(path, JSON.stringify(plan));
  return path;
}

const run = (plan, args = []) =>
  runScript('schedule.js', ['--plan-file', writePlan(plan), ...args]);

/** 依 index 取出算出來的截止日 */
const dueOf = (json) =>
  Object.fromEntries(json.data.schedule.map((wp) => [wp.index, wp.dueDate]));

test('沒有相依時，每顆各自從起始日加上自己的人天', async () => {
  const { code, json } = await run({
    startDate: '2026-09-21',
    workPackages: [
      { index: 1, title: '甲', days: 2 },
      { index: 2, title: '乙', days: 5 },
    ],
  });

  assert.equal(code, 0);
  assert.deepEqual(dueOf(json), { 1: '2026-09-23', 2: '2026-09-26' });
});

test('有先決時，截止日從先決的截止日往後算', async () => {
  const { json } = await run({
    startDate: '2026-09-21',
    workPackages: [
      { index: 1, title: '甲', days: 2 },
      { index: 2, title: '乙', days: 3, depends: [1] },
    ],
  });

  assert.deepEqual(dueOf(json), { 1: '2026-09-23', 2: '2026-09-26' });
});

test('多個先決時取最晚的那一個當起點', async () => {
  const { json } = await run({
    startDate: '2026-09-21',
    workPackages: [
      { index: 1, title: '甲', days: 2 },
      { index: 2, title: '乙', days: 9 },
      { index: 3, title: '丙', days: 1, depends: [1, 2] },
    ],
  });

  assert.equal(dueOf(json)[3], '2026-10-01', '要等最晚的乙做完才開始');
});

test('任一工作包的截止日都不早於它的先決', async () => {
  const { json } = await run({
    startDate: '2026-09-21',
    workPackages: [
      { index: 1, title: '甲', days: 3 },
      { index: 2, title: '乙', days: 1, depends: [1] },
      { index: 3, title: '丙', days: 1, depends: [2] },
      { index: 4, title: '丁', days: 4, depends: [1] },
      { index: 5, title: '戊', days: 2, depends: [3, 4] },
    ],
  });

  const due = dueOf(json);
  const depends = { 2: [1], 3: [2], 4: [1], 5: [3, 4] };
  for (const [index, prerequisites] of Object.entries(depends)) {
    for (const p of prerequisites) {
      assert.ok(due[index] > due[p], `#${index} 的截止日不該早於先決 #${p}`);
    }
  }
});

test('輸出的順序即拓撲順序，先決一定排在後續之前', async () => {
  const { json } = await run({
    startDate: '2026-09-21',
    workPackages: [
      { index: 3, title: '丙', days: 1, depends: [2] },
      { index: 1, title: '甲', days: 1 },
      { index: 2, title: '乙', days: 1, depends: [1] },
    ],
  });

  assert.deepEqual(json.data.order, [1, 2, 3]);
});

test('相依成環時中止，並指出環上的成員', async () => {
  const { code, json } = await run({
    startDate: '2026-09-21',
    workPackages: [
      { index: 1, title: '甲', days: 1, depends: [2] },
      { index: 2, title: '乙', days: 1, depends: [1] },
    ],
  });

  assert.equal(code, 1);
  assert.equal(json.error.code, 'CYCLE_DETECTED');
  assert.match(json.error.message, /1/);
  assert.match(json.error.message, /2/);
});

test('先決指向不存在的工作包時中止', async () => {
  const { code, json } = await run({
    startDate: '2026-09-21',
    workPackages: [{ index: 1, title: '甲', days: 1, depends: [99] }],
  });

  assert.equal(code, 1);
  assert.equal(json.error.code, 'UNKNOWN_DEPENDENCY');
  assert.match(json.error.message, /99/);
});

test('人天必須是正數', async () => {
  const { json } = await run({
    startDate: '2026-09-21',
    workPackages: [{ index: 1, title: '甲', days: 0 }],
  });

  assert.equal(json.error.code, 'BAD_PLAN');
  assert.match(json.error.message, /days/);
});

test('起始日格式不對時中止', async () => {
  const { json } = await run({
    startDate: '2026/09/21',
    workPackages: [{ index: 1, title: '甲', days: 1 }],
  });

  assert.equal(json.error.code, 'BAD_PLAN');
  assert.match(json.error.message, /startDate/);
});

test('計畫檔不存在時帶著路徑失敗', async () => {
  const { code, json } = await runScript('schedule.js', ['--plan-file', '/nonexistent/plan.json']);

  assert.equal(code, 1);
  assert.equal(json.error.code, 'PLAN_FILE_MISSING');
  assert.match(json.error.message, /\/nonexistent\/plan\.json/);
});

test('計畫檔不是合法 JSON 時中止', async () => {
  mkdirSync(tmpRoot, { recursive: true });
  const dir = mkdtempSync(join(tmpRoot, 'plan-'));
  const path = join(dir, 'plan.json');
  writeFileSync(path, '{ 這不是 JSON');

  const { json } = await runScript('schedule.js', ['--plan-file', path]);

  assert.equal(json.error.code, 'BAD_PLAN');
});

test('輸出保留標題與人天，呼叫端不必回頭對照計畫檔', async () => {
  const { json } = await run({
    startDate: '2026-09-21',
    workPackages: [{ index: 7, title: '建立抽取契約', days: 3 }],
  });

  assert.deepEqual(json.data.schedule[0], {
    index: 7,
    title: '建立抽取契約',
    days: 3,
    dueDate: '2026-09-24',
  });
});

test('這支腳本完全不碰 Gitea：沒有登入資訊也能算', async () => {
  const { code } = await runScript(
    'schedule.js',
    ['--plan-file', writePlan({ startDate: '2026-09-21', workPackages: [{ index: 1, title: '甲', days: 1 }] })],
    { env: { TEA_SDLC_CONFIG: '/nonexistent/tea.yml' } },
  );

  assert.equal(code, 0);
});