import { DatabaseSync } from 'node:sqlite';
import { pool } from '../../lib/db/pool.js';
import * as pages from '../../lib/db/repos/pages.js';
import * as projects from '../../lib/db/repos/projects.js';
import * as tasks from '../../lib/db/repos/tasks.js';
import * as messages from '../../lib/db/repos/messages.js';
import * as map from '../../lib/db/repos/migration_map.js';

const SYS = { kind: 'system', id: null };
const slugify = (s) => (s || '').toLowerCase().replace(/[^a-z0-9]+/g, '-').replace(/(^-|-$)/g, '').slice(0, 60) || 'item';

// conversations.create() has no space_id param; insert directly so migrated chats
// live in the void1 Space.
async function createConversation(title, spaceId) {
  const { rows: [r] } = await pool.query(
    `INSERT INTO conversations(title, space_id, metadata) VALUES($1,$2,'{}') RETURNING id`, [title || 'Conversation', spaceId]);
  return r.id;
}

export async function importVoid1({ sqlitePath, spaceId, dryRun = false }) {
  const db = new DatabaseSync(sqlitePath, { readOnly: true });
  const n = { pages: 0, projects: 0, tasks: 0, conversations: 0, messages: 0 };
  const projIds = new Map();   // void1 project id -> void2 project id

  for (const w of db.prepare(`SELECT * FROM wiki_pages`).all()) {
    if (await map.seen('void1', `wiki_pages:${w.id}`, 'page')) continue;
    n.pages++; if (dryRun) continue;
    const p = await pages.create({ space_id: spaceId, slug: slugify(w.slug || w.title), title: w.title || 'Untitled', body_md: w.content || '' }, SYS);
    await map.record('void1', `wiki_pages:${w.id}`, 'page', p.id);
  }
  for (const pr of db.prepare(`SELECT * FROM projects`).all()) {
    const existing = await map.seen('void1', `projects:${pr.id}`, 'project');
    if (existing) { projIds.set(pr.id, existing); continue; }
    n.projects++; if (dryRun) continue;
    const created = await projects.create({ space_id: spaceId, slug: slugify(pr.name), name: pr.name || 'Project', description: pr.description || null, status: pr.status === 'archived' ? 'archived' : 'active' }, SYS);
    projIds.set(pr.id, created.id);
    await map.record('void1', `projects:${pr.id}`, 'project', created.id);
  }
  for (const t of db.prepare(`SELECT * FROM project_tasks`).all()) {
    if (await map.seen('void1', `project_tasks:${t.id}`, 'task')) continue;
    n.tasks++; if (dryRun) continue;
    const created = await tasks.create({ space_id: spaceId, project_id: projIds.get(t.project_id) || null, title: t.text || 'Task', position: t.position ?? 0 }, SYS);
    await map.record('void1', `project_tasks:${t.id}`, 'task', created.id);
  }
  for (const j of db.prepare(`SELECT * FROM project_journal`).all()) {
    if (await map.seen('void1', `project_journal:${j.id}`, 'page')) continue;
    n.pages++; if (dryRun) continue;
    const p = await pages.create({ space_id: spaceId, slug: slugify(`journal-${j.id}`), title: `Journal ${j.id}`, body_md: j.content || '' }, SYS);
    await map.record('void1', `project_journal:${j.id}`, 'page', p.id);
  }
  for (const c of db.prepare(`SELECT * FROM conversations`).all()) {
    let convId = await map.seen('void1', `conversations:${c.id}`, 'conversation');
    if (!convId) {
      n.conversations++;
      if (!dryRun) {
        convId = await createConversation(c.title, spaceId);
        await map.record('void1', `conversations:${c.id}`, 'conversation', convId);
      }
    }
    for (const m of db.prepare(`SELECT * FROM messages WHERE conversation_id=? ORDER BY created_at`).all(c.id)) {
      if (await map.seen('void1', `messages:${m.id}`, 'message')) continue;
      n.messages++; if (dryRun) continue;
      const appended = await messages.append(convId, { role: m.role === 'assistant' ? 'assistant' : 'user', body: m.content || '' });
      await map.record('void1', `messages:${m.id}`, 'message', appended.id);
    }
  }
  db.close();
  return n;
}