/**
 * Project management service
 */

import type { Track } from '@/types/track';
import {
  saveProject,
  loadProject,
  getAllProjects,
  deleteProject,
  serializeAudioBuffer,
  deserializeAudioBuffer,
  type ProjectData,
  type SerializedTrack,
} from './db';
import type { ProjectMetadata } from './db';
import { getAudioContext } from '../audio/context';
import { generateId } from '../audio/effects/chain';

// Re-export ProjectMetadata for easier importing
export type { ProjectMetadata } from './db';

/**
 * Generate unique project ID
 */
export function generateProjectId(): string {
  return `project_${Date.now()}_${Math.random().toString(36).substr(2, 9)}`;
}

/**
 * Convert tracks to serialized format
 */
function serializeTracks(tracks: Track[]): SerializedTrack[] {
  return tracks.map(track => ({
    id: track.id,
    name: track.name,
    color: track.color,
    volume: track.volume,
    pan: track.pan,
    muted: track.mute,
    soloed: track.solo,
    collapsed: track.collapsed,
    height: track.height,
    audioBuffer: track.audioBuffer ? serializeAudioBuffer(track.audioBuffer) : null,
    effects: track.effectChain?.effects || [],
    automation: track.automation,
    recordEnabled: track.recordEnabled,
  }));
}

/**
 * Convert serialized tracks back to Track format
 */
function deserializeTracks(serialized: SerializedTrack[]): Track[] {
  const audioContext = getAudioContext();

  return serialized.map(track => ({
    id: track.id,
    name: track.name,
    color: track.color,
    volume: track.volume,
    pan: track.pan,
    mute: track.muted,
    solo: track.soloed,
    collapsed: track.collapsed,
    height: track.height,
    audioBuffer: track.audioBuffer ? deserializeAudioBuffer(track.audioBuffer, audioContext) : null,
    effectChain: {
      id: generateId(),
      name: `${track.name} FX`,
      effects: track.effects,
    },
    automation: track.automation,
    recordEnabled: track.recordEnabled,
    selected: false,
    showEffects: false,
    selection: null, // Reset selection on load
  }));
}

/**
 * Calculate total project duration
 */
function calculateDuration(tracks: Track[]): number {
  let maxDuration = 0;

  for (const track of tracks) {
    if (track.audioBuffer) {
      maxDuration = Math.max(maxDuration, track.audioBuffer.duration);
    }
  }

  return maxDuration;
}

/**
 * Save current project state
 */
export async function saveCurrentProject(
  projectId: string | null,
  projectName: string,
  tracks: Track[],
  settings: {
    zoom: number;
    currentTime: number;
    sampleRate: number;
  },
  description?: string
): Promise<string> {
  const id = projectId || generateProjectId();
  const now = Date.now();

  const metadata: ProjectMetadata = {
    id,
    name: projectName,
    description,
    createdAt: projectId ? (await loadProject(id))?.metadata.createdAt || now : now,
    updatedAt: now,
    duration: calculateDuration(tracks),
    sampleRate: settings.sampleRate,
    trackCount: tracks.length,
  };

  const projectData: ProjectData = {
    metadata,
    tracks: serializeTracks(tracks),
    settings,
  };

  await saveProject(projectData);
  return id;
}

/**
 * Load project and restore state
 */
export async function loadProjectById(projectId: string): Promise<{
  tracks: Track[];
  settings: {
    zoom: number;
    currentTime: number;
    sampleRate: number;
  };
  metadata: ProjectMetadata;
} | null> {
  const project = await loadProject(projectId);
  if (!project) return null;

  return {
    tracks: deserializeTracks(project.tracks),
    settings: project.settings,
    metadata: project.metadata,
  };
}

/**
 * Get list of all projects
 */
export async function listProjects(): Promise<ProjectMetadata[]> {
  return getAllProjects();
}

/**
 * Delete a project
 */
export async function removeProject(projectId: string): Promise<void> {
  return deleteProject(projectId);
}

/**
 * Duplicate a project
 */
export async function duplicateProject(sourceProjectId: string, newName: string): Promise<string> {
  const project = await loadProject(sourceProjectId);
  if (!project) throw new Error('Project not found');

  const newId = generateProjectId();
  const now = Date.now();

  const newProject: ProjectData = {
    ...project,
    metadata: {
      ...project.metadata,
      id: newId,
      name: newName,
      createdAt: now,
      updatedAt: now,
    },
  };

  await saveProject(newProject);
  return newId;
}