from __future__ import annotations

import argparse
import json
import pathlib
import re
import sqlite3
import tempfile
import sys
if __name__ == '__main__' and __package__ is None:
  sys.path.insert(0, str(pathlib.Path(__file__).resolve().parents[1]))

import generator.performance

APPLICATION_ID = 0x56414D50
SONG_COLUMNS = """
  id TEXT PRIMARY KEY NOT NULL CHECK(length(trim(id)) BETWEEN 1 AND 160),
  title TEXT NOT NULL CHECK(length(trim(title)) BETWEEN 1 AND 200),
  composer TEXT NOT NULL,
  key_signature TEXT NOT NULL,
  source_path TEXT NOT NULL UNIQUE CHECK(length(source_path) > 0),
  source_json TEXT NOT NULL CHECK(json_valid(source_json)),
  measure_count INTEGER NOT NULL CHECK(measure_count > 0),
  total_pages INTEGER NOT NULL CHECK(total_pages BETWEEN 1 AND 10000),
  title_image TEXT NOT NULL CHECK(length(title_image) = 64 AND title_image NOT GLOB '*[^0-9a-f]*')
"""

def metadata(path: pathlib.Path, root: pathlib.Path) -> dict:
  if path.is_symlink() or not path.resolve().is_relative_to(root.resolve()):
    raise ValueError('score escapes the asset root')
  text = path.read_text(encoding='utf-8')
  document = json.loads(text)
  if not isinstance(document, dict) or not isinstance(document.get('music'), dict) or not isinstance(document.get('presentation'), dict):
    raise ValueError('score bundle requires music and presentation objects')
  music, presentation = document['music'], document['presentation']
  if len(music['staves']) != 1 or (presentation['width'], presentation['height']) != (976, 484):
    raise ValueError('expected one staff and 976x484 pages')
  staff, meta = music['staves'][0], music['metadata']
  for name in ('title', 'composer', 'key_signature', 'time_signature'):
    if not isinstance(meta[name], str):
      raise ValueError(f'{name} must be a string')
  key = meta['key_signature']
  title_image = presentation.get('title_image')
  if not isinstance(title_image, str) or not re.fullmatch('[0-9a-f]{64}', title_image):
    raise ValueError('presentation requires a generated Pico title image; regenerate assets')
  if not isinstance(staff['name'], str):
    raise ValueError('staff name must be a string')
  relative = path.relative_to(root)
  return dict(id=path.stem, title=meta['title'], composer=meta['composer'], key_signature=key,
    source_path=relative.as_posix(), source_json=text,
    measure_count=len(staff['measures']), total_pages=len(presentation['pages']), title_image=title_image, part=staff['name'])

def populate(connection: sqlite3.Connection, root: pathlib.Path, audio_assets=None) -> None:
  if not root.is_dir():
    raise ValueError(f'{root}: score asset directory not found')
  if audio_assets is None:
    audio_assets = []
    for path in sorted(root.glob('sounds/*.wav')):
      if path.name not in ('beat1.wav', 'beat2.wav'):
        raise ValueError(f'{path}: unknown metronome sample')
      audio_assets.append(generator.performance.describe_wav(path, root))
    for path in sorted(root.glob('backing/*.wav')):
      match = re.fullmatch(r'([a-z0-9]+(?:_[a-z0-9]+)*)_(60|70|80|90|100|110|120)\.wav', path.name)
      if not match:
        raise ValueError(f'{path}: invalid backing filename')
      audio_assets.append(generator.performance.describe_wav(path, root, song_id=match[1], bpm=int(match[2])))
  folder = root / 'songs'
  if (folder.exists() or folder.is_symlink()) and not folder.is_dir():
    raise ValueError(f'{folder}: score asset directory not found')
  with connection:
    connection.execute('BEGIN')
    connection.execute(f'PRAGMA application_id = {APPLICATION_ID}')
    connection.execute(f'CREATE TABLE songs ({SONG_COLUMNS}, part TEXT NOT NULL) STRICT')
    connection.execute('CREATE INDEX songs_menu ON songs(title, composer, part, id)')
    connection.execute('CREATE TABLE resources (id TEXT PRIMARY KEY, value TEXT NOT NULL CHECK(json_valid(value))) STRICT')
    connection.execute('INSERT INTO resources VALUES (?, ?)', ('audio', json.dumps(audio_assets)))
    for path in sorted(folder.rglob('*.json')):
      try:
        if path.parent != folder:
          raise ValueError('unexpected songs score path')
        row = metadata(path, root)
        connection.execute(f'INSERT INTO songs ({", ".join(row)}) VALUES ({", ".join("?" for _ in row)})', tuple(row.values()))
      except (ValueError, KeyError, TypeError, sqlite3.Error) as error:
        raise ValueError(f'{path}: {error}') from error
    if connection.execute('PRAGMA integrity_check').fetchall() != [('ok',)]:
      raise ValueError('catalog integrity check failed')

def build_catalog(root: pathlib.Path, destination: pathlib.Path | None = None, *, audio_assets=None) -> pathlib.Path:
  if not root.is_dir():
    raise ValueError(f'{root}: score asset directory not found')
  destination = destination or root / 'catalog.db'
  destination.parent.mkdir(parents=True, exist_ok=True)
  with tempfile.TemporaryDirectory(prefix='.vamp_catalog_', dir=destination.parent) as temporary:
    staged = pathlib.Path(temporary) / 'catalog.db'
    connection = sqlite3.connect(staged)
    try:
      populate(connection, root, audio_assets)
    finally:
      connection.close()
    staged.replace(destination)
  return destination

if __name__ == '__main__':
  parser = argparse.ArgumentParser(description='Compile generated score bundles into a read-only runtime catalog.')
  parser.add_argument('assets', type=pathlib.Path)
  parser.add_argument('destination', type=pathlib.Path, nargs='?')
  arguments = parser.parse_args()
  build_catalog(arguments.assets, arguments.destination)