const test = require('node:test');
const assert = require('node:assert');
const {
  summarizePerHoster,
  classifyErrorCategory,
  summarizeBatchErrors,
  isRetryableCategory
} = require('../lib/stats');

function makeBatch(timestamp, results) {
  return {
    id: 'b-' + timestamp,
    timestamp: new Date(timestamp).toISOString(),
    files: [{ name: 'foo.mp4', size: 1, results }]
  };
}

test('summarizePerHoster counts ok and fail per hoster across all batches', () => {
  const history = [
    makeBatch(1, [
      { hoster: 'voe.sx', status: 'done' },
      { hoster: 'byse.sx', status: 'error', error: 'Not video file format' }
    ]),
    makeBatch(2, [
      { hoster: 'voe.sx', status: 'done' },
      { hoster: 'voe.sx', status: 'error', error: 'CSRF' },
      { hoster: 'byse.sx', status: 'done' }
    ])
  ];
  const s = summarizePerHoster(history);
  assert.strictEqual(s['voe.sx'].ok, 2);
  assert.strictEqual(s['voe.sx'].fail, 1);
  assert.strictEqual(s['voe.sx'].total, 3);
  assert.strictEqual(Math.round(s['voe.sx'].rate * 100), 67);
  assert.strictEqual(s['byse.sx'].ok, 1);
  assert.strictEqual(s['byse.sx'].fail, 1);
  assert.strictEqual(s['byse.sx'].rate, 0.5);
});

test('summarizePerHoster honors sinceMs cutoff', () => {
  const history = [
    makeBatch(1000, [{ hoster: 'voe.sx', status: 'done' }]),
    makeBatch(5000, [{ hoster: 'voe.sx', status: 'error', error: 'x' }])
  ];
  const s = summarizePerHoster(history, { sinceMs: 3000 });
  assert.strictEqual(s['voe.sx'].ok, 0);
  assert.strictEqual(s['voe.sx'].fail, 1);
});

test('summarizePerHoster honors lastNBatches (newest first)', () => {
  const history = [
    makeBatch(1000, [{ hoster: 'voe.sx', status: 'done' }]),
    makeBatch(2000, [{ hoster: 'voe.sx', status: 'done' }]),
    makeBatch(3000, [{ hoster: 'voe.sx', status: 'error', error: 'x' }])
  ];
  const s = summarizePerHoster(history, { lastNBatches: 1 });
  assert.strictEqual(s['voe.sx'].ok, 0);
  assert.strictEqual(s['voe.sx'].fail, 1);
});

test('summarizePerHoster handles empty / malformed input', () => {
  assert.deepStrictEqual(summarizePerHoster(null), {});
  assert.deepStrictEqual(summarizePerHoster([]), {});
  assert.deepStrictEqual(summarizePerHoster([{ id: 'x', files: null }]), {});
});

test('classifyErrorCategory: file-rejected phrases', () => {
  assert.strictEqual(classifyErrorCategory('Byse lehnte Datei ab: Not video file format'), 'file-rejected');
  assert.strictEqual(classifyErrorCategory('Duplicate file already exists'), 'file-rejected');
  assert.strictEqual(classifyErrorCategory('Datei zu groß (Max: 5 GB)'), 'file-rejected');
});

test('classifyErrorCategory: account-error phrases', () => {
  assert.strictEqual(classifyErrorCategory('Quota exceeded'), 'account-error');
  assert.strictEqual(classifyErrorCategory('account banned'), 'account-error');
  assert.strictEqual(classifyErrorCategory('not enough disk space'), 'account-error');
});

test('classifyErrorCategory: hoster-transient phrases', () => {
  assert.strictEqual(classifyErrorCategory('CSRF-Token nicht gefunden'), 'hoster-transient');
  assert.strictEqual(classifyErrorCategory('Kein Upload-Server erhalten: server busy'), 'hoster-transient');
  assert.strictEqual(classifyErrorCategory('Kein Filecode'), 'hoster-transient');
});

test('classifyErrorCategory: network phrases', () => {
  assert.strictEqual(classifyErrorCategory('socket hang up'), 'network');
  assert.strictEqual(classifyErrorCategory('fetch failed'), 'network');
  assert.strictEqual(classifyErrorCategory('Timeout while reading'), 'network');
});

test('classifyErrorCategory: aborted is its own bucket (not retryable)', () => {
  assert.strictEqual(classifyErrorCategory('Abgebrochen'), 'aborted');
  assert.strictEqual(isRetryableCategory('aborted'), false);
});

test('classifyErrorCategory: unknown for everything else', () => {
  assert.strictEqual(classifyErrorCategory(''), 'unknown');
  assert.strictEqual(classifyErrorCategory(null), 'unknown');
  assert.strictEqual(classifyErrorCategory('Some weird thing'), 'unknown');
});

test('summarizeBatchErrors buckets results by category', () => {
  const summary = {
    files: [
      { name: 'a.mp4', results: [
        { hoster: 'voe.sx', status: 'done' },
        { hoster: 'byse.sx', status: 'error', error: 'Not video file format' }
      ] },
      { name: 'b.mp4', results: [
        { hoster: 'voe.sx', status: 'error', error: 'CSRF' },
        { hoster: 'doodstream.com', status: 'error', error: 'socket hang up' }
      ] }
    ]
  };
  const buckets = summarizeBatchErrors(summary);
  assert.strictEqual(buckets['file-rejected'].length, 1);
  assert.strictEqual(buckets['file-rejected'][0].hoster, 'byse.sx');
  assert.strictEqual(buckets['hoster-transient'].length, 1);
  assert.strictEqual(buckets['hoster-transient'][0].hoster, 'voe.sx');
  assert.strictEqual(buckets['network'].length, 1);
  assert.strictEqual(buckets['network'][0].hoster, 'doodstream.com');
  assert.strictEqual(buckets['account-error'].length, 0);
});

test('isRetryableCategory: only transient + network + unknown retry-worthy', () => {
  assert.strictEqual(isRetryableCategory('hoster-transient'), true);
  assert.strictEqual(isRetryableCategory('network'), true);
  assert.strictEqual(isRetryableCategory('unknown'), true);
  assert.strictEqual(isRetryableCategory('file-rejected'), false);
  assert.strictEqual(isRetryableCategory('account-error'), false);
  assert.strictEqual(isRetryableCategory('aborted'), false);
});