from __future__ import annotations

import argparse
import shutil
import tempfile
from pathlib import Path
from time import monotonic

from generator.arrange.generate import generate_performance_scores
from generator.practice.generate import generate_practice_scores
from generator.score import count_json_files, validate_generated_tree
from generator.summary import validate_expected_performance_summary, validate_practice_parts
from generator.parts import source_paths
from generator.engraving import Fonts, Style, engrave_tree
from generator.engraving.cache import renderer_fingerprint
from generator.playback import compile_tree
from generator.catalog import build_catalog

RUNTIME_FONT_FILES = ("PetalumaScript.otf", "OFL.txt")

def copy_runtime_fonts(static_assets_dir: Path, output_dir: Path) -> None:
  source = static_assets_dir / "fonts" / "petaluma"
  destination = output_dir / "fonts" / "petaluma"
  destination.mkdir(parents=True, exist_ok=True)
  for name in RUNTIME_FONT_FILES:
    shutil.copy2(source / name, destination / name)

def parse_args() -> argparse.Namespace:
  parser = argparse.ArgumentParser(description="Generate Product Vamp package score assets.")
  parser.add_argument("--data-dir", type=Path)
  parser.add_argument("--output-dir", type=Path)
  parser.add_argument("--renderer-fingerprint", action="store_true", help="Print the engraving cache identity without generating assets.")
  parser.add_argument("--static-assets-dir", type=Path, default=Path("package/assets"))
  parser.add_argument("--check", action="store_true")
  parser.add_argument("--engraving-cache", type=Path)
  parser.add_argument("--jobs", type=int, default=1, choices=range(1, 17), metavar="1-16")
  parser.add_argument("--progress", action="store_true")
  args = parser.parse_args()
  if not args.renderer_fingerprint and (args.data_dir is None or args.output_dir is None):
    parser.error('--data-dir and --output-dir are required for generation')
  return args

def generate_assets(args: argparse.Namespace) -> None:
  data_dir = args.data_dir.resolve()
  output_dir = args.output_dir.resolve()
  static_assets_dir = args.static_assets_dir.resolve()
  cache_dir = getattr(args, 'engraving_cache', None)
  cache_dir = cache_dir.resolve() if cache_dir else None
  if cache_dir and (cache_dir.is_relative_to(output_dir) or output_dir.is_relative_to(cache_dir)):
    raise ValueError('engraving cache and generated assets must not overlap')
  progress = getattr(args, 'progress', False)
  started = monotonic()

  def report(message):
    if progress:
      print(f'Assets [{monotonic() - started:.0f}s]: {message}', flush=True)

  report('checking source paths')
  for source in sorted(data_dir.rglob('*.xml')):
    if source.is_relative_to(data_dir / 'rhythms'):
      continue
    if source.parent not in (data_dir / 'practice', data_dir / 'songs'):
      raise ValueError(f'{source}: MusicXML sources belong directly under data/practice or data/songs')
  source_paths(data_dir / 'songs')
  source_paths(data_dir / 'practice', practice=True)
  output_dir.parent.mkdir(parents=True, exist_ok=True)
  with tempfile.TemporaryDirectory(prefix='.vamp-assets-', dir=output_dir.parent) as temporary:
    staged = Path(temporary) / 'assets'
    staged.mkdir(parents=True, exist_ok=True)
    copy_runtime_fonts(static_assets_dir, staged)
    report('generating performance and practice parts')
    performance_count = generate_performance_scores(data_dir / 'songs', staged / 'songs')
    practice_count = generate_practice_scores(data_dir / 'practice', staged / 'practice')
    validate_generated_tree(staged)
    if args.check:
      validate_expected_performance_summary(data_dir / 'expected' / 'performance_summary.json', staged / 'songs')
      validate_practice_parts(staged / 'practice')
    report('compiling playback')
    compile_tree(staged)
    report('engraving pages')
    engrave_tree(staged, static_assets_dir / 'fonts' / 'petaluma', cache_dir=cache_dir, jobs=getattr(args, 'jobs', 1), progress=progress)
    report('validating score, page, and audio assets')
    validate_generated_tree(staged)
    report('building catalog database')
    build_catalog(staged)
    backup = Path(temporary) / 'previous'
    if output_dir.exists():
      output_dir.rename(backup)
    try:
      staged.rename(output_dir)
    except OSError:
      if backup.exists():
        backup.rename(output_dir)
      raise
    report('publishing complete')
    print(f'Generated Product Vamp assets: {performance_count} performance scores, '
      f'{practice_count} practice parts, {count_json_files(output_dir)} total JSON files.')
    if args.check:
      print('Generator check passed.')

def main() -> int:
  args = parse_args()
  if args.renderer_fingerprint:
    print(renderer_fingerprint(Fonts(args.static_assets_dir / 'fonts' / 'petaluma'), Style()))
  else:
    generate_assets(args)
  return 0

if __name__ == "__main__":
  raise SystemExit(main())