/**
 * Metrics wall taxonomy — maps chart catalog entries into sections/groups.
 * Versioned independently so new collectors can land without UI rewrites.
 */

export const TAXONOMY_VERSION = 1

/** @typedef {{ id: string, title: string, order: number, match: (id: string, meta: object) => boolean }} SectionDef */

/** @type {SectionDef[]} */
export const SECTIONS = [
  {
    id: 'system',
    title: 'System',
    order: 10,
    match: (id, meta) =>
      starts(id, [
        'system.',
        'cpu.',
        'mem.',
        'disk_',
        'disk.',
        'net.',
        'ip.',
        'ipv4.',
        'ipv6.',
        'processes.',
      ]) || ctxStarts(meta, ['system.', 'cpu.', 'mem.', 'disk.', 'net.', 'ip.']),
  },
  {
    id: 'containers',
    title: 'Containers',
    order: 20,
    match: (id, meta) =>
      starts(id, ['docker.', 'cgroup.', 'peardock.']) ||
      ctxStarts(meta, ['docker.', 'cgroup.', 'peardock.']),
  },
  {
    id: 'storage',
    title: 'Storage',
    order: 30,
    match: (id, meta) =>
      starts(id, ['zfs.', 'bcache.', 'dmcache.', 'md.', 'mdstat.', 'smart.', 'fs.', 'ioping.']) ||
      ctxStarts(meta, ['zfs.', 'bcache.', 'dmcache.', 'md.', 'smart.', 'fs.']),
  },
  {
    id: 'hardware',
    title: 'Hardware',
    order: 40,
    match: (id, meta) =>
      starts(id, ['sensors.', 'gpu.', 'nvidia.', 'ipmi.', 'system.power', 'power.']) ||
      ctxStarts(meta, ['sensors.', 'gpu.', 'ipmi.', 'power.']),
  },
  {
    id: 'applications',
    title: 'Applications',
    order: 50,
    match: (id, meta) =>
      starts(id, [
        'nginx.',
        'apache.',
        'redis.',
        'mysql.',
        'postgres.',
        'memcached.',
        'mongodb.',
        'rabbitmq.',
        'kafka.',
        'nats.',
        'unbound.',
      ]) ||
      ctxStarts(meta, [
        'nginx.',
        'apache.',
        'redis.',
        'mysql.',
        'postgres.',
        'memcached.',
        'mongodb.',
        'rabbitmq.',
        'kafka.',
        'nats.',
        'unbound.',
      ]),
  },
  {
    id: 'network-svc',
    title: 'Network services',
    order: 60,
    match: (id, meta) =>
      starts(id, ['sockets.', 'net.conntrack', 'system.softnet', 'ip.tcp', 'ip.udp']) ||
      ctxStarts(meta, ['sockets.', 'net.conntrack']),
  },
  {
    id: 'observability',
    title: 'Observability',
    order: 70,
    match: (id, meta) =>
      starts(id, ['ebpf.', 'statsd.', 'prometheus.', 'peardata.', 'self.']) ||
      ctxStarts(meta, ['ebpf.', 'statsd.', 'prometheus.', 'peardata.']),
  },
  {
    id: 'fleet',
    title: 'Fleet',
    order: 80,
    match: (id, meta) => starts(id, ['fleet.']) || ctxStarts(meta, ['fleet.']),
  },
  {
    id: 'other',
    title: 'Other',
    order: 900,
    match: () => true,
  },
]

/**
 * @param {string} id
 * @param {string[]} prefixes
 */
function starts(id, prefixes) {
  const s = String(id || '')
  return prefixes.some((p) => s === p || s.startsWith(p))
}

/**
 * @param {object} meta
 * @param {string[]} prefixes
 */
function ctxStarts(meta, prefixes) {
  const c = String(meta?.context || meta?.name || '')
  return prefixes.some((p) => c === p || c.startsWith(p))
}

/**
 * @param {string} id
 * @param {object} meta
 */
export function sectionForChart(id, meta = {}) {
  for (const sec of SECTIONS) {
    if (sec.id === 'other') continue
    if (sec.match(id, meta)) return sec
  }
  return SECTIONS[SECTIONS.length - 1]
}

/**
 * @param {Record<string, object>} catalog
 * @param {string} [filter]
 * @returns {{
 *   sections: Array<{
 *     id: string,
 *     title: string,
 *     order: number,
 *     count: number,
 *     groups: Array<{ family: string, charts: Array<{ id: string, meta: object }> }>
 *   }>
 * }}
 */
export function groupCatalog(catalog, filter = '') {
  const q = String(filter || '')
    .trim()
    .toLowerCase()
  /** @type {Map<string, { id: string, title: string, order: number, families: Map<string, Array<{ id: string, meta: object }>> }>} */
  const bySection = new Map()
  for (const sec of SECTIONS) {
    bySection.set(sec.id, {
      id: sec.id,
      title: sec.title,
      order: sec.order,
      families: new Map(),
    })
  }

  const ids = Object.keys(catalog || {})
  for (const id of ids) {
    const meta = catalog[id] || {}
    if (q && !matchesFilter(id, meta, q)) continue
    const sec = sectionForChart(id, meta)
    const bucket = bySection.get(sec.id)
    if (!bucket) continue
    const family = String(meta.family || meta.context || '_default')
    if (!bucket.families.has(family)) bucket.families.set(family, [])
    bucket.families.get(family).push({ id, meta })
  }

  const sections = [...bySection.values()]
    .map((sec) => {
      const groups = [...sec.families.entries()]
        .map(([family, charts]) => ({
          family,
          charts: charts.sort(compareCharts),
        }))
        .sort((a, b) => a.family.localeCompare(b.family))
      const count = groups.reduce((n, g) => n + g.charts.length, 0)
      return { id: sec.id, title: sec.title, order: sec.order, count, groups }
    })
    .filter((s) => s.count > 0)
    .sort((a, b) => a.order - b.order)

  return { sections }
}

/**
 * @param {string} id
 * @param {object} meta
 * @param {string} q lowercase
 */
function matchesFilter(id, meta, q) {
  const hay = [
    id,
    meta.title,
    meta.name,
    meta.context,
    meta.family,
    meta.plugin,
    meta.units,
  ]
    .filter(Boolean)
    .join(' ')
    .toLowerCase()
  return hay.includes(q)
}

/**
 * @param {{ id: string, meta: object }} a
 * @param {{ id: string, meta: object }} b
 */
function compareCharts(a, b) {
  const pa = Number(a.meta?.priority) || 99999
  const pb = Number(b.meta?.priority) || 99999
  if (pa !== pb) return pa - pb
  return a.id.localeCompare(b.id)
}

/** Time presets for the global metrics bar (seconds of history). */
export const TIME_PRESETS = [
  { id: '1m', label: '1m', seconds: 60 },
  { id: '5m', label: '5m', seconds: 300 },
  { id: '15m', label: '15m', seconds: 900 },
  { id: '1h', label: '1h', seconds: 3600 },
  { id: '6h', label: '6h', seconds: 21600 },
]