import json
from pathlib import Path
import tempfile
import unittest

from generator.practice.generate import generate_practice_scores, key_file_name
from generator.score import slugify, validate_generated_tree
from generator.summary import validate_practice_variants
from generator.transposition import TARGET_KEYS
from tests.test_musicxml import xml_note, xml_score

class CatalogueTests(unittest.TestCase):
  def test_every_practice_source_has_its_own_complete_output(self):
    source = Path('data/practice')
    sources = sorted(source.rglob('*.xml'))
    self.assertTrue(sources)
    expected = set()
    for path in sources:
      relative = path.relative_to(source)
      self.assertEqual(len(relative.parts), 3, str(path))
      self.assertIn(relative.parts[0], ('chord', 'melody'), str(path))
      for key in TARGET_KEYS:
        expected.add(relative.parent / slugify(path.stem) / key_file_name(key))
    self.assertEqual(len(expected), len(sources) * len(TARGET_KEYS))
    with tempfile.TemporaryDirectory() as temporary:
      output = Path(temporary)
      self.assertEqual(generate_practice_scores(source, output), len(expected))
      self.assertEqual({p.relative_to(output) for p in output.rglob('*.json')}, expected)
      validate_practice_variants(output)
      validate_generated_tree(output)
  def test_numbered_paths_and_duplicate_titles_remain_distinct(self):
    names = ('chord/001_lesson/001-cycles.xml', 'chord/001_lesson/010-cycles.xml', 'chord/002_lesson/001-cycles.xml', 'melody/001_lesson/127-cycles.xml')
    with tempfile.TemporaryDirectory() as temporary:
      source, output = Path(temporary) / 'source', Path(temporary) / 'output'
      for name in names:
        path = source / name
        path.parent.mkdir(parents=True, exist_ok=True)
        path.write_text(xml_score(xml_note()), encoding='utf-8')
      self.assertEqual(generate_practice_scores(source, output), len(names) * len(TARGET_KEYS))
      for name in names:
        directory = output / Path(name).with_suffix('')
        self.assertEqual({p.name for p in directory.glob('*.json')}, {key_file_name(key) for key in TARGET_KEYS})
        self.assertEqual(json.loads((directory / 'c.json').read_text())['metadata']['title'], 'Fixture')
  def test_invalid_source_locations_fail_before_writing(self):
    for name in ('chords/001_lesson/001-exercise.xml', 'chord/001-exercise.xml', 'melody/001_lesson/extra/001-exercise.xml'):
      with self.subTest(name=name), tempfile.TemporaryDirectory() as temporary:
        source, output = Path(temporary) / 'source', Path(temporary) / 'output'
        for relative in ('chord/001_lesson/001-valid.xml', name):
          path = source / relative
          path.parent.mkdir(parents=True, exist_ok=True)
          path.write_text(xml_score(xml_note()), encoding='utf-8')
        with self.assertRaisesRegex(ValueError, 'practice source must be stored'):
          generate_practice_scores(source, output)
        self.assertFalse(output.exists())
  def test_normalized_filename_collisions_fail_before_writing(self):
    with tempfile.TemporaryDirectory() as temporary:
      source, output = Path(temporary) / 'source', Path(temporary) / 'output'
      lesson = source / 'chord' / '001_lesson'
      lesson.mkdir(parents=True)
      for name in ('001-Cycles.xml', '001_cycles.xml'):
        (lesson / name).write_text(xml_score(xml_note()), encoding='utf-8')
      with self.assertRaisesRegex(ValueError, 'output path collides'):
        generate_practice_scores(source, output)
      self.assertFalse(output.exists())