import { pool } from '../db.js'
import { encrypt, decrypt } from '../crypto.js'
import { requireAdmin } from '../auth.js'
import { INTEGRATIONS, MASKED } from '../integrations/schema.js'
import { testConnection as newbookTest, fetchSiteList } from '../integrations/newbook.js'
import { testConnection as resosTest } from '../integrations/resos.js'

function decryptSecrets(row) {
  if (!row.secrets) return {}
  try { return JSON.parse(decrypt(row.secrets)) } catch { return {} }
}

function maskRow(row) {
  const schema = INTEGRATIONS[row.slug]
  const existing = decryptSecrets(row)
  const masked = {}
  for (const f of schema?.secretFields ?? []) {
    masked[f] = existing[f] ? MASKED : null
  }
  return { slug: row.slug, name: row.name, config: row.config, secrets: masked, enabled: row.enabled, updated_at: row.updated_at }
}

export async function integrationRoutes(app) {
  // GET /settings/api/integrations
  app.get('/integrations', { preHandler: requireAdmin }, async () => {
    const { rows } = await pool.query('SELECT * FROM integrations ORDER BY slug')
    return rows.map(maskRow)
  })

  // GET /settings/api/integrations/:slug
  app.get('/integrations/:slug', { preHandler: requireAdmin }, async (req, reply) => {
    const { rows: [row] } = await pool.query('SELECT * FROM integrations WHERE slug = $1', [req.params.slug])
    if (!row) return reply.status(404).send({ error: 'Not found' })
    return maskRow(row)
  })

  // PUT /settings/api/integrations/:slug
  app.put('/integrations/:slug', { preHandler: requireAdmin }, async (req, reply) => {
    const { slug } = req.params
    const schema = INTEGRATIONS[slug]
    if (!schema) return reply.status(404).send({ error: 'Unknown integration' })

    const body = req.body || {}

    // Build config (plaintext fields)
    const config = {}
    for (const f of schema.configFields) {
      if (body[f] !== undefined) config[f] = body[f]
    }

    // Merge secrets — skip masked sentinel values so we don't overwrite with garbage
    const { rows: [existing] } = await pool.query('SELECT secrets FROM integrations WHERE slug = $1', [slug])
    const prev = existing ? decryptSecrets(existing) : {}
    const next = { ...prev }
    for (const f of schema.secretFields) {
      if (body[f] !== undefined && body[f] !== MASKED && body[f] !== '') {
        next[f] = body[f]
      }
    }
    const secretsEnc = Object.keys(next).length ? encrypt(JSON.stringify(next)) : null
    const enabled = body.enabled !== undefined ? Boolean(body.enabled) : true

    await pool.query(`
      INSERT INTO integrations (slug, name, config, secrets, enabled, updated_at)
      VALUES ($1, $2, $3, $4, $5, NOW())
      ON CONFLICT (slug) DO UPDATE SET
        config = EXCLUDED.config,
        secrets = EXCLUDED.secrets,
        enabled = EXCLUDED.enabled,
        updated_at = NOW()
    `, [slug, schema.name, config, secretsEnc, enabled])

    const { rows: [updated] } = await pool.query('SELECT * FROM integrations WHERE slug = $1', [slug])
    return maskRow(updated)
  })

  // POST /settings/api/integrations/:slug/test
  app.post('/integrations/:slug/test', { preHandler: requireAdmin }, async (req, reply) => {
    const { rows: [row] } = await pool.query('SELECT * FROM integrations WHERE slug = $1', [req.params.slug])
    if (!row) return reply.status(404).send({ error: 'Not found' })
    const creds = { ...row.config, ...decryptSecrets(row) }
    try {
      if (req.params.slug === 'newbook') await newbookTest(creds)
      else if (req.params.slug === 'resos') await resosTest(creds)
      else return reply.status(400).send({ error: `No test available for ${req.params.slug}` })
      return { ok: true }
    } catch (e) {
      return { ok: false, error: e.message }
    }
  })

  // POST /settings/api/integrations/newbook/sync-rooms
  app.post('/integrations/newbook/sync-rooms', { preHandler: requireAdmin }, async (req, reply) => {
    const { rows: [row] } = await pool.query(`SELECT * FROM integrations WHERE slug = 'newbook'`)
    if (!row?.enabled) return reply.status(400).send({ error: 'Newbook integration not enabled' })
    const creds = { ...row.config, ...decryptSecrets(row) }
    if (!creds.api_key) return reply.status(400).send({ error: 'Newbook credentials not configured' })

    let raw
    try { raw = await fetchSiteList(creds) }
    catch (e) { return reply.status(502).send({ error: e.message }) }

    // Normalise: site_list returns array with category_id, category_name, site_id, site_name
    const items = Array.isArray(raw) ? raw : (raw?.data ?? [])
    const catMap = {}
    const sites = []
    for (const item of items) {
      const cid = String(item.category_id)
      if (!catMap[cid]) {
        catMap[cid] = { id: cid, name: item.category_name, sort_order: Object.keys(catMap).length, colour: null }
      }
      if (item.site_id) {
        sites.push({ id: String(item.site_id), name: item.site_name, category_id: cid })
      }
    }

    // Preserve existing sort_order and colour customisations
    const { rows: [prev] } = await pool.query(`SELECT value FROM global_config WHERE key = 'newbook.rooms'`)
    const prevCats = {}
    for (const c of prev?.value?.categories ?? []) prevCats[c.id] = c

    const categories = Object.values(catMap).map(c => ({
      ...c,
      sort_order: prevCats[c.id]?.sort_order ?? c.sort_order,
      colour: prevCats[c.id]?.colour ?? null,
    })).sort((a, b) => a.sort_order - b.sort_order)

    const value = { categories, sites, synced_at: new Date().toISOString() }
    await pool.query(`
      INSERT INTO global_config (key, value, updated_at) VALUES ('newbook.rooms', $1, NOW())
      ON CONFLICT (key) DO UPDATE SET value = EXCLUDED.value, updated_at = NOW()
    `, [value])

    return value
  })

  // PUT /settings/api/integrations/newbook/rooms — save reorder + colour changes
  app.put('/integrations/newbook/rooms', { preHandler: requireAdmin }, async (req, reply) => {
    const { rows: [row] } = await pool.query(`SELECT value FROM global_config WHERE key = 'newbook.rooms'`)
    if (!row) return reply.status(404).send({ error: 'No room data — sync first' })
    const categories = (req.body?.categories ?? row.value.categories).map((c, i) => ({ ...c, sort_order: i }))
    const updated = { ...row.value, categories }
    await pool.query(`UPDATE global_config SET value = $1, updated_at = NOW() WHERE key = 'newbook.rooms'`, [updated])
    return updated
  })
}