#!/usr/bin/env node
'use strict';

const os = require('os');
const { createStateStore } = require('./lib/state-store');

const VALUE_FLAGS = new Set([
  '--db',
  '--id',
  '--limit',
  '--metadata-json',
  '--owner',
  '--priority',
  '--repo',
  '--repo-root',
  '--session',
  '--session-id',
  '--source',
  '--source-id',
  '--status',
  '--title',
  '--url',
]);

function showHelp(exitCode = 0) {
  console.log(`
Usage:
  node scripts/work-items.js list [--db <path>] [--json] [--limit <n>]
  node scripts/work-items.js show <id> [--db <path>] [--json]
  node scripts/work-items.js upsert [<id>] --title <title> [options] [--json]
  node scripts/work-items.js close <id> [--status done] [--db <path>] [--json]

Track Linear, GitHub, handoff, and manual roadmap items in the ECC SQLite state
store so "ecc status" can include linked work and blocked operator follow-up.

Options:
  --id <id>                 Stable local work-item id for upsert
  --source <source>         Source system, e.g. linear, github, handoff, manual
  --source-id <id>          Source-local identifier, e.g. ECC-20 or PR number
  --status <status>         Status such as open, in-progress, blocked, done
  --priority <priority>     Optional priority label
  --url <url>               Optional source URL
  --owner <owner>           Optional owner label
  --repo-root <path>        Optional repo root to associate with this item
  --repo <path>             Alias for --repo-root
  --session-id <id>         Optional ECC session id
  --session <id>            Alias for --session-id
  --metadata-json <json>    Optional JSON metadata payload
  --db <path>               SQLite state database path
  --json                    Emit JSON
`);
  process.exit(exitCode);
}

function assignOption(options, flag, value) {
  if (flag === '--db') options.dbPath = value;
  else if (flag === '--id') options.id = value;
  else if (flag === '--limit') options.limit = value;
  else if (flag === '--metadata-json') options.metadataJson = value;
  else if (flag === '--owner') options.owner = value;
  else if (flag === '--priority') options.priority = value;
  else if (flag === '--repo' || flag === '--repo-root') options.repoRoot = value;
  else if (flag === '--session' || flag === '--session-id') options.sessionId = value;
  else if (flag === '--source') options.source = value;
  else if (flag === '--source-id') options.sourceId = value;
  else if (flag === '--status') options.status = value;
  else if (flag === '--title') options.title = value;
  else if (flag === '--url') options.url = value;
  else throw new Error(`Unknown argument: ${flag}`);
}

function parseArgs(argv) {
  const args = argv.slice(2);
  const parsed = {
    command: 'list',
    dbPath: null,
    help: false,
    json: false,
    limit: 20,
    positionals: [],
  };

  if (args[0] && !args[0].startsWith('-')) {
    parsed.command = args.shift();
  }

  for (let index = 0; index < args.length; index += 1) {
    const arg = args[index];
    if (arg === '--help' || arg === '-h') {
      parsed.help = true;
    } else if (arg === '--json') {
      parsed.json = true;
    } else if (VALUE_FLAGS.has(arg)) {
      const value = args[index + 1];
      if (!value || value.startsWith('--')) {
        throw new Error(`Missing value for ${arg}`);
      }
      assignOption(parsed, arg, value);
      index += 1;
    } else if (!arg.startsWith('-')) {
      parsed.positionals.push(arg);
    } else {
      throw new Error(`Unknown argument: ${arg}`);
    }
  }

  return parsed;
}

function parseMetadataJson(value) {
  if (value === undefined || value === null) {
    return null;
  }

  try {
    return JSON.parse(value);
  } catch (error) {
    throw new Error(`Invalid --metadata-json: ${error.message}`);
  }
}

function resolveWorkItemId(options) {
  return options.id || options.positionals[0] || null;
}

function normalizeLimit(value) {
  const parsed = Number.parseInt(value, 10);
  if (!Number.isFinite(parsed) || parsed <= 0) {
    throw new Error(`Invalid limit: ${value}`);
  }
  return parsed;
}

function buildUpsertPayload(options, existing = null) {
  const id = resolveWorkItemId(options);
  if (!id) {
    throw new Error('Missing work item id. Pass <id> or --id <id>.');
  }

  const title = options.title ?? (existing && existing.title);
  if (!title) {
    throw new Error('Missing --title for a new work item.');
  }

  return {
    id,
    source: options.source ?? (existing && existing.source) ?? 'manual',
    sourceId: options.sourceId ?? (existing && existing.sourceId) ?? null,
    title,
    status: options.status ?? (existing && existing.status) ?? 'open',
    priority: options.priority ?? (existing && existing.priority) ?? null,
    url: options.url ?? (existing && existing.url) ?? null,
    owner: options.owner ?? (existing && existing.owner) ?? null,
    repoRoot: options.repoRoot ?? (existing && existing.repoRoot) ?? process.cwd(),
    sessionId: options.sessionId ?? (existing && existing.sessionId) ?? null,
    metadata: options.metadataJson !== undefined
      ? parseMetadataJson(options.metadataJson)
      : ((existing && existing.metadata) ?? null),
    createdAt: existing ? existing.createdAt : undefined,
    updatedAt: new Date().toISOString(),
  };
}

function printWorkItem(item) {
  const sourceId = item.sourceId ? `#${item.sourceId}` : item.id;
  console.log(`${item.source}/${sourceId} ${item.status}: ${item.title}`);
  console.log(`ID: ${item.id}`);
  console.log(`Priority: ${item.priority || '(none)'}`);
  console.log(`Owner: ${item.owner || '(unassigned)'}`);
  console.log(`Repo: ${item.repoRoot || '(none)'}`);
  console.log(`Session: ${item.sessionId || '(none)'}`);
  console.log(`Updated: ${item.updatedAt}`);
  if (item.url) {
    console.log(`URL: ${item.url}`);
  }
}

function printWorkItemList(payload) {
  console.log(`Work items: ${payload.items.length} shown / ${payload.totalCount} total`);
  if (payload.items.length === 0) {
    console.log('  - none');
    return;
  }

  for (const item of payload.items) {
    const sourceId = item.sourceId ? `#${item.sourceId}` : item.id;
    console.log(`  - ${item.source}/${sourceId} ${item.status}: ${item.title}`);
    console.log(`    ID: ${item.id}`);
    console.log(`    Owner: ${item.owner || '(unassigned)'}`);
    console.log(`    Updated: ${item.updatedAt}`);
    if (item.url) {
      console.log(`    URL: ${item.url}`);
    }
  }
}

async function main() {
  let store = null;

  try {
    const options = parseArgs(process.argv);
    if (options.help) {
      showHelp(0);
    }

    store = await createStateStore({
      dbPath: options.dbPath,
      homeDir: process.env.HOME || os.homedir(),
    });

    if (options.command === 'list') {
      const payload = store.listWorkItems({ limit: normalizeLimit(options.limit) });
      if (options.json) {
        console.log(JSON.stringify(payload, null, 2));
      } else {
        printWorkItemList(payload);
      }
      return;
    }

    if (options.command === 'show') {
      const id = resolveWorkItemId(options);
      if (!id) {
        throw new Error('Missing work item id.');
      }
      const item = store.getWorkItemById(id);
      if (!item) {
        throw new Error(`Work item not found: ${id}`);
      }
      if (options.json) {
        console.log(JSON.stringify(item, null, 2));
      } else {
        printWorkItem(item);
      }
      return;
    }

    if (options.command === 'upsert') {
      const id = resolveWorkItemId(options);
      const existing = id ? store.getWorkItemById(id) : null;
      const item = store.upsertWorkItem(buildUpsertPayload(options, existing));
      if (options.json) {
        console.log(JSON.stringify(item, null, 2));
      } else {
        printWorkItem(item);
      }
      return;
    }

    if (options.command === 'close') {
      const id = resolveWorkItemId(options);
      if (!id) {
        throw new Error('Missing work item id.');
      }
      const existing = store.getWorkItemById(id);
      if (!existing) {
        throw new Error(`Work item not found: ${id}`);
      }
      const item = store.upsertWorkItem(buildUpsertPayload({
        ...options,
        id,
        status: options.status || 'done',
      }, existing));
      if (options.json) {
        console.log(JSON.stringify(item, null, 2));
      } else {
        printWorkItem(item);
      }
      return;
    }

    throw new Error(`Unknown command: ${options.command}`);
  } catch (error) {
    console.error(`Error: ${error.message}`);
    process.exit(1);
  } finally {
    if (store) {
      store.close();
    }
  }
}

if (require.main === module) {
  main();
}

module.exports = {
  buildUpsertPayload,
  main,
  parseArgs,
};