import type { SectionId } from '@/content/types';
import type {
  AudioInitialState,
  ChapterIntent,
  DriveEnergySample,
  MusicMood,
} from '@/audio/types';

const JOURNEY_MUSIC = Object.freeze({
  start: { mood: 'open', entryPhrase: 0 },
  profile: { mood: 'open', entryPhrase: 1 },
  experience: { mood: 'shadow', entryPhrase: 2 },
  infrastructure: { mood: 'shadow', entryPhrase: 3 },
  'selected-builds': { mood: 'lift', entryPhrase: 4 },
  'additional-work': { mood: 'lift', entryPhrase: 5 },
  toolkit: { mood: 'resolve', entryPhrase: 6 },
  contact: { mood: 'resolve', entryPhrase: 7 },
} as const satisfies Readonly<Record<
  SectionId,
  { readonly mood: MusicMood; readonly entryPhrase: number }
>>);

export function resolveChapterIntent(
  sectionId: SectionId,
  generation = 0,
): ChapterIntent {
  const chapter = JOURNEY_MUSIC[sectionId];
  return Object.freeze({
    sectionId,
    mood: chapter.mood,
    atStart: sectionId === 'start',
    entryPhrase: chapter.entryPhrase,
    generation: Math.max(0, Math.trunc(generation)),
  });
}

export const DEFAULT_CHAPTER_INTENT = resolveChapterIntent('start');
export const DEFAULT_DRIVE_ENERGY = Object.freeze({
  energy: 0,
  source: 'idle',
} as const satisfies DriveEnergySample);

export const DEFAULT_AUDIO_INITIAL_STATE = Object.freeze({
  chapter: DEFAULT_CHAPTER_INTENT,
  drive: DEFAULT_DRIVE_ENERGY,
} as const satisfies AudioInitialState);