const { query } = require('../../utils/db')

const COLS =
  'id, category, title, slug, excerpt, body, image_url, published, author_id, created_at, updated_at, published_at, announced_at, announce_job_id'

// Published posts for a category, newest first — public feed.
async function listPublished(category) {
  return query(
    `SELECT ${COLS} FROM posts WHERE category = ? AND published = 1 ` +
      'ORDER BY COALESCE(published_at, created_at) DESC, id DESC',
    [category],
  )
}

// Every published post, across categories, newest first — the option source
// behind `core.announce.post`'s `postId` param (EVENTS.md §F, Phase 10). Its own
// query rather than a loop over `listPublished` because an authoring dropdown
// wants one bounded, ordered list and needs neither the body nor the excerpt: a
// hundred posts' bodies would be a megabyte of HTML sent to draw a `<select>`.
async function listPublishedForOptions(limit = 200) {
  const n = Math.min(Math.max(Number(limit) || 200, 1), 500)
  return query(
    'SELECT id, category, title FROM posts WHERE published = 1 ' +
      `ORDER BY COALESCE(published_at, created_at) DESC, id DESC LIMIT ${n}`,
  )
}

// All posts for a category (admin), newest first.
async function listAll(category) {
  if (category) {
    return query(`SELECT ${COLS} FROM posts WHERE category = ? ORDER BY id DESC`, [category])
  }
  return query(`SELECT ${COLS} FROM posts ORDER BY id DESC`)
}

async function findById(id) {
  const rows = await query(`SELECT ${COLS} FROM posts WHERE id = ? LIMIT 1`, [id])
  return rows[0] || null
}

async function findPublished(category, id, slug) {
  const rows = await query(
    `SELECT ${COLS} FROM posts WHERE category = ? AND published = 1 AND (id = ? OR slug = ?) LIMIT 1`,
    [category, id, slug],
  )
  return rows[0] || null
}

async function insert(post) {
  const res = await query(
    'INSERT INTO posts (category, title, slug, excerpt, body, image_url, published, author_id, published_at) ' +
      'VALUES (?, ?, ?, ?, ?, ?, ?, ?, ?)',
    [
      post.category,
      post.title,
      post.slug || null,
      post.excerpt || null,
      post.body || null,
      post.image_url || null,
      post.published ? 1 : 0,
      post.author_id || null,
      post.published ? new Date() : null,
    ],
  )
  return res.insertId
}

async function update(id, fields) {
  const cols = []
  const params = []
  for (const [key, val] of Object.entries(fields)) {
    cols.push(`${key} = ?`)
    params.push(val)
  }
  if (cols.length === 0) return
  params.push(id)
  await query(`UPDATE posts SET ${cols.join(', ')} WHERE id = ?`, params)
}

async function remove(id) {
  return query('DELETE FROM posts WHERE id = ?', [id])
}

async function countByCategory() {
  return query('SELECT category, COUNT(*) AS c FROM posts GROUP BY category')
}

module.exports = {
  listPublished,
  listPublishedForOptions,
  listAll,
  findById,
  findPublished,
  insert,
  update,
  remove,
  countByCategory,
}