#!/usr/bin/env npx tsx
/**
 * Prepare all projects for exact-key migration (CF-762)
 * For each project: delete → recreate → assign shared issue type scheme
 * Then the migration script can run for all projects at once.
 *
 * Usage:
 *   npx tsx scripts/prepare-all-projects.ts [--dry-run] [--exclude CF]
 */

import pg from 'pg';
import dotenv from 'dotenv';
import { dirname, join } from 'path';
import { fileURLToPath } from 'url';

const __dirname = dirname(fileURLToPath(import.meta.url));
dotenv.config({ path: join(__dirname, '..', '.env'), override: true });

const { Pool } = pg;

const JIRA_URL = process.env.JIRA_URL || 'https://agiliton.atlassian.net';
const JIRA_USER = process.env.JIRA_USERNAME || process.env.JIRA_EMAIL || '';
const JIRA_TOKEN = process.env.JIRA_API_TOKEN || '';
const JIRA_AUTH = Buffer.from(`${JIRA_USER}:${JIRA_TOKEN}`).toString('base64');
const SHARED_SCHEME_ID = '10329'; // Agiliton Software Issue Type Scheme

const pool = new Pool({
  host: process.env.POSTGRES_HOST || 'postgres.agiliton.internal',
  port: 5432, database: 'agiliton', user: 'agiliton',
  password: 'QtqiwCOAUpQNF6pjzOMAREzUny2bY8V1', max: 3,
});

const args = process.argv.slice(2);
const DRY_RUN = args.includes('--dry-run');
const excludeIdx = args.indexOf('--exclude');
const EXCLUDE = excludeIdx >= 0 ? args[excludeIdx + 1]?.split(',') || [] : [];

function delay(ms: number): Promise<void> {
  return new Promise(resolve => setTimeout(resolve, ms));
}

async function jiraFetch(path: string, options: RequestInit = {}): Promise<Response> {
  return fetch(`${JIRA_URL}/rest/api/3${path}`, {
    ...options,
    headers: {
      Authorization: `Basic ${JIRA_AUTH}`,
      'Content-Type': 'application/json',
      Accept: 'application/json',
      ...options.headers,
    },
  });
}

async function getJiraProjects(): Promise<Array<{ key: string; name: string; id: string }>> {
  const res = await jiraFetch('/project');
  if (!res.ok) return [];
  return res.json() as Promise<Array<{ key: string; name: string; id: string }>>;
}

async function deleteProject(key: string): Promise<boolean> {
  const res = await jiraFetch(`/project/${key}?enableUndo=false`, { method: 'DELETE' });
  return res.status === 204;
}

async function createProject(key: string, name: string, leadAccountId: string): Promise<string | null> {
  const res = await jiraFetch('/project', {
    method: 'POST',
    body: JSON.stringify({
      key,
      name,
      projectTypeKey: 'business',
      leadAccountId,
      assigneeType: 'UNASSIGNED',
    }),
  });
  if (res.ok || res.status === 201) {
    const data = await res.json() as { id: string };
    return data.id;
  }
  console.error(`  FAIL create ${key}: ${res.status} ${await res.text()}`);
  return null;
}

async function assignScheme(projectId: string): Promise<boolean> {
  const res = await jiraFetch('/issuetypescheme/project', {
    method: 'PUT',
    body: JSON.stringify({
      issueTypeSchemeId: SHARED_SCHEME_ID,
      projectId,
    }),
  });
  return res.ok || res.status === 204;
}

async function verifyScheme(key: string): Promise<boolean> {
  const res = await jiraFetch(`/project/${key}/statuses`);
  if (!res.ok) return false;
  const statuses = await res.json() as Array<{ name: string }>;
  const names = statuses.map(s => s.name);
  return names.includes('Epic') && names.includes('Task') && names.includes('Bug');
}

async function main() {
  console.log('=== Prepare Projects for Migration ===');
  console.log(`Mode: ${DRY_RUN ? 'DRY RUN' : 'LIVE'}`);
  console.log(`Exclude: ${EXCLUDE.length > 0 ? EXCLUDE.join(', ') : 'none'}`);
  console.log('');

  // Get current user for project lead
  const meRes = await jiraFetch('/myself');
  const me = await meRes.json() as { accountId: string };

  // Get existing Jira projects
  const jiraProjects = await getJiraProjects();
  const jiraProjectMap = new Map(jiraProjects.map(p => [p.key, p]));
  console.log(`Jira projects: ${jiraProjects.length}`);

  // Get DB projects with tasks
  const dbProjects = await pool.query(
    `SELECT p.key, p.name, COUNT(t.id) as task_count,
            MAX(CAST(REGEXP_REPLACE(t.id, '^' || p.key || '-', '') AS INTEGER)) as max_id
     FROM projects p
     JOIN tasks t ON t.project = p.key
     WHERE p.key ~ '^[A-Z]{2,5}$'
     GROUP BY p.key, p.name
     ORDER BY p.key`
  );

  console.log(`DB projects with tasks: ${dbProjects.rows.length}`);
  console.log('');

  // Filter: must exist in Jira, not excluded
  const toProcess = dbProjects.rows.filter((p: any) => {
    if (EXCLUDE.includes(p.key)) return false;
    if (!jiraProjectMap.has(p.key)) return false;
    return true;
  });

  console.log(`Projects to prepare: ${toProcess.length}`);
  console.log('');

  // Summary table
  console.log('Project | Tasks | Max ID | Placeholders | Status');
  console.log('--------|-------|--------|-------------|-------');
  let totalTasks = 0;
  let totalPlaceholders = 0;
  for (const p of toProcess) {
    const placeholders = p.max_id - p.task_count;
    totalTasks += parseInt(p.task_count);
    totalPlaceholders += placeholders;
    console.log(`${p.key.padEnd(7)} | ${String(p.task_count).padStart(5)} | ${String(p.max_id).padStart(6)} | ${String(placeholders).padStart(11)} | pending`);
  }
  console.log(`TOTAL   | ${String(totalTasks).padStart(5)} | ${String(totalTasks + totalPlaceholders).padStart(6)} | ${String(totalPlaceholders).padStart(11)} |`);
  console.log('');

  if (DRY_RUN) {
    console.log('[DRY RUN] Would process above projects. Run without --dry-run to execute.');
    await pool.end();
    return;
  }

  // Process each project
  let success = 0;
  let failed = 0;
  for (let i = 0; i < toProcess.length; i++) {
    const p = toProcess[i];
    const jiraProject = jiraProjectMap.get(p.key)!;
    console.log(`[${i + 1}/${toProcess.length}] ${p.key} (${p.name})...`);

    // 1. Delete
    await delay(1000);
    const deleted = await deleteProject(p.key);
    if (!deleted) {
      console.error(`  FAIL delete ${p.key}`);
      failed++;
      continue;
    }
    console.log(`  Deleted`);

    // 2. Wait a bit for Jira to process
    await delay(2000);

    // 3. Recreate
    const newId = await createProject(p.key, jiraProject.name || p.name, me.accountId);
    if (!newId) {
      console.error(`  FAIL recreate ${p.key}`);
      failed++;
      continue;
    }
    console.log(`  Recreated (id=${newId})`);

    // 4. Assign shared scheme
    await delay(1000);
    const schemeOk = await assignScheme(newId);
    if (!schemeOk) {
      console.error(`  FAIL assign scheme for ${p.key}`);
      failed++;
      continue;
    }

    // 5. Verify
    const verified = await verifyScheme(p.key);
    if (!verified) {
      console.error(`  FAIL verify scheme for ${p.key} (missing Epic/Task/Bug)`);
      failed++;
      continue;
    }

    console.log(`  Scheme OK (Epic/Task/Bug)`);
    success++;
  }

  console.log(`\n=== Preparation Summary ===`);
  console.log(`Success: ${success}`);
  console.log(`Failed: ${failed}`);
  console.log(`\nRun migration: npx tsx scripts/migrate-tasks-to-jira.ts --skip-preflight`);

  await pool.end();
}

main().catch(err => { console.error(err); process.exit(1); });