// Entry CRUD — atomic data + tree (project/workflow via parent_id). Base, D1 only.
import type { Bindings, Entry } from '../types';

function uid(prefix: string): string {
  // deterministic-enough unique id without Math.random in hot path is fine here;
  // crypto.randomUUID is available in Workers runtime.
  return `${prefix}_${crypto.randomUUID()}`;
}

export interface CreateEntryInput {
  content?: string | null;
  entry_type: string;
  owner_id?: string | null;
  parent_id?: string | null;
  page_name?: string | null;
  refs_json?: string;
  tags_json?: string;
  task_status?: string | null;
  confidence?: number | null;
  metadata_json?: string | null;
  id?: string;
}

export async function createEntry(db: D1Database, input: CreateEntryInput): Promise<Entry> {
  const id = input.id ?? uid('e');
  await db
    .prepare(
      `INSERT INTO entries (id, content, entry_type, owner_id, parent_id, page_name, refs_json, tags_json, task_status, confidence, metadata_json)
       VALUES (?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?)`,
    )
    .bind(
      id,
      input.content ?? null,
      input.entry_type,
      input.owner_id ?? null,
      input.parent_id ?? null,
      input.page_name ?? null,
      input.refs_json ?? '[]',
      input.tags_json ?? '[]',
      input.task_status ?? null,
      input.confidence ?? null,
      input.metadata_json ?? null,
    )
    .run();
  const row = await getEntry(db, id);
  if (!row) throw new Error('createEntry: insert succeeded but row not found');
  return row;
}

export async function getEntry(db: D1Database, id: string): Promise<Entry | null> {
  const row = await db.prepare('SELECT * FROM entries WHERE id = ?').bind(id).first<Entry>();
  return row ?? null;
}

export interface ListEntriesFilter {
  entry_type?: string;
  owner_id?: string;
  parent_id?: string;
  page_name?: string;   // exact-match lookup (e.g. skill-/example- idempotency key)
  limit?: number;
  offset?: number;
}

export async function listEntries(db: D1Database, f: ListEntriesFilter = {}): Promise<Entry[]> {
  const conds: string[] = [];
  const params: unknown[] = [];
  if (f.entry_type) { conds.push('entry_type = ?'); params.push(f.entry_type); }
  if (f.owner_id) { conds.push('owner_id = ?'); params.push(f.owner_id); }
  if (f.parent_id) { conds.push('parent_id = ?'); params.push(f.parent_id); }
  if (f.page_name) { conds.push('page_name = ?'); params.push(f.page_name); }
  const where = conds.length ? `WHERE ${conds.join(' AND ')}` : '';
  const limit = Math.min(f.limit ?? 100, 1000);
  const offset = f.offset ?? 0;
  const res = await db
    .prepare(`SELECT * FROM entries ${where} ORDER BY created_at DESC LIMIT ? OFFSET ?`)
    .bind(...params, limit, offset)
    .all<Entry>();
  return res.results ?? [];
}

export interface UpdateEntryInput {
  content?: string | null;
  parent_id?: string | null;
  page_name?: string | null;
  refs_json?: string;
  tags_json?: string;
  task_status?: string | null;
  confidence?: number | null;
  metadata_json?: string | null;
}

export async function updateEntry(db: D1Database, id: string, patch: UpdateEntryInput): Promise<Entry | null> {
  const cols: string[] = [];
  const params: unknown[] = [];
  const map: Record<string, unknown> = patch as Record<string, unknown>;
  for (const k of ['content', 'parent_id', 'page_name', 'refs_json', 'tags_json', 'task_status', 'confidence', 'metadata_json']) {
    if (k in map && map[k] !== undefined) { cols.push(`${k} = ?`); params.push(map[k]); }
  }
  if (cols.length === 0) return getEntry(db, id);
  cols.push('updated_at = unixepoch()');
  await db.prepare(`UPDATE entries SET ${cols.join(', ')} WHERE id = ?`).bind(...params, id).run();
  return getEntry(db, id);
}

export async function deleteEntry(db: D1Database, id: string): Promise<void> {
  await db.prepare('DELETE FROM entries WHERE id = ?').bind(id).run();
}

// D1 LIKE keyword search (base; semantic search is the optional embed module).
export async function searchEntries(db: D1Database, q: string, owner_id?: string, limit = 50): Promise<Entry[]> {
  const conds = ['content LIKE ?'];
  const params: unknown[] = [`%${q}%`];
  if (owner_id) { conds.push('owner_id = ?'); params.push(owner_id); }
  const res = await db
    .prepare(`SELECT * FROM entries WHERE ${conds.join(' AND ')} ORDER BY updated_at DESC LIMIT ?`)
    .bind(...params, Math.min(limit, 200))
    .all<Entry>();
  return res.results ?? [];
}