// Pure render helpers for PluginAssetPanels.vue (ADR-010 get_asset_panels, Path
// A). Kept separate from the .vue so the mapping logic - which turns a plugin's
// JSON panel declaration + its endpoint data into rendered rows - is unit
// tested directly (same pattern as geenforce/entryForm.js).

export function subst(text, assetid) {
  return String(text).replace('{assetid}', assetid)
}

// Panel endpoints are declared absolute (/api/...); the api instance already
// carries the /api base, so strip it before fetching through the instance.
export function toApiPath(endpoint, assetid) {
  return subst(endpoint, assetid).replace(/^\/api(?=\/)/, '')
}

export function formatValue(value, spec = {}) {
  if (value === null || value === undefined || value === '') return ''
  if (spec.format === 'date') {
    const raw = String(value)
    return new Date(raw + (raw.length === 10 ? 'T00:00:00' : '')).toLocaleDateString()
  }
  // Timestamps arrive as UTC ISO ("2026-09-04T16:13:29Z") because the wire
  // format is UTC by contract. Render in the viewer's local zone: an operator
  // comparing "last reported" against the clock on the wall cannot do the
  // offset in their head, and the Z suffix invites reading it as local.
  if (spec.format === 'datetime') {
    const parsed = new Date(String(value))
    if (isNaN(parsed)) return value
    return parsed.toLocaleString()
  }
  if (typeof value === 'boolean') return value ? 'Yes' : 'No'
  return value
}

export function humanize(key) {
  return key.charAt(0).toUpperCase() + key.slice(1)
}

export function rows(panel) {
  const data = panel._data
  let list
  if (Array.isArray(data)) list = data
  else if (data && Array.isArray(data.rows)) list = data.rows
  else if (data && Array.isArray(data.items)) list = data.items
  else if (data && Array.isArray(data.reports)) list = data.reports
  else return []
  // Optional panel-level row filter so two panels can share one endpoint feed
  // and each show a slice of it (for example Tracked Services vs Tracked
  // Processes off the same services snapshot). Absent filter = all rows.
  const filter = panel.filter
  if (filter && filter.key) {
    const want = String(filter.equals).toLowerCase()
    return list.filter((item) => String(item[filter.key]).toLowerCase() === want)
  }
  return list
}

// Optional in-card filter chips. A list panel declares facets: {key, order,
// labels} and the renderer offers one chip per distinct value of that key,
// with a count. Filtering is client-side over rows the panel already fetched -
// no extra request, and the counts stay honest because they are computed from
// the same array.
//
// Declared rather than hardcoded because the reason it exists is generic: the
// activity feed mixes info, warning and critical, and somebody triaging wants
// the criticals alone. Any list panel with a category column has that problem.
// Colour names carry no meaning to a reader. A panel keyed on statecolor
// (green/yellow/red) is labelled by the LEVEL those map to, while one keyed on
// a word (info/warning/critical) is labelled by the word itself.
const COLOUR_VALUES = ['green', 'yellow', 'red', 'grey', 'gray', 'blue']
const LEVEL_ORDER = ['critical', 'warning', 'ok', 'unknown']

// A panel that shows a health dot has already declared what it is dotting on.
// Reuse that instead of asking every panel to declare filters a second time:
// any card with a status rollup gets chips, and the two cannot disagree.
function facetSpec(panel) {
  if (panel.facets && panel.facets.key) return panel.facets
  const status = panel.status
  if (!status || !status.key) return null
  const levels = status.levels || {}
  const order = Object.keys(levels).sort(
    (a, b) => LEVEL_ORDER.indexOf(levels[a]) - LEVEL_ORDER.indexOf(levels[b])
  )
  const labels = {}
  Object.keys(levels).forEach((value) => {
    labels[value] = COLOUR_VALUES.includes(String(value).toLowerCase())
      ? humanize(levels[value])
      : humanize(value)
  })
  return { key: status.key, order, labels }
}

export function facets(panel) {
  const spec = facetSpec(panel)
  if (!spec || !spec.key) return []
  const all = rows(panel)
  const counts = new Map()
  all.forEach((item) => {
    const value = item[spec.key]
    if (value === null || value === undefined || value === '') return
    const key = String(value)
    counts.set(key, (counts.get(key) || 0) + 1)
  })
  // Declared order first, so severity reads critical-warning-info rather than
  // alphabetically; anything unexpected in the data still gets a chip.
  const declared = (spec.order || []).filter((value) => counts.has(value))
  const extra = [...counts.keys()].filter((value) => !declared.includes(value)).sort()
  return [...declared, ...extra].map((value) => ({
    value,
    label: (spec.labels && spec.labels[value]) || humanize(value),
    count: counts.get(value)
  }))
}

// rows() after the viewer's chip selection. An empty selection means "no filter
// applied", NOT "hide everything": a card that vanished when you deselected the
// last chip would read as broken.
export function facetedRows(panel, selected) {
  const all = rows(panel)
  const spec = facetSpec(panel)
  if (!spec || !spec.key || !selected || !selected.length) return all
  return all.filter((item) => selected.includes(String(item[spec.key])))
}

export function mapTitle(panel, item) {
  const key = panel.map && panel.map.title
  return key ? item[key] : ''
}

export function mapBadge(panel, item) {
  const badge = panel.map && panel.map.badge
  if (!badge) return null
  const raw = item[badge.label]
  const label = (badge.labelmap && badge.labelmap[raw]) || raw
  return { label, color: badge.color ? item[badge.color] : undefined }
}

export function mapMeta(panel, item) {
  const meta = (panel.map && panel.map.meta) || []
  return meta
    .map((spec) => {
      const value = formatValue(item[spec.key], spec)
      if (value === '') return null
      const text = spec.label ? `${spec.label} ${value}` : value
      return { text, mono: !!spec.mono }
    })
    .filter(Boolean)
}

export function mapBody(panel, item) {
  const key = panel.map && panel.map.body
  if (!key) return null
  const value = item[key]
  if (value === null || value === undefined || value === '') return null
  return String(value)
}

export function manageLink(panel, assetid) {
  return panel.manage ? subst(panel.manage.to, assetid) : null
}

export function keyvalueFields(panel) {
  const data = panel._data
  if (data && Array.isArray(data.fields)) {
    return data.fields.map((f) => ({
      label: f.label, value: formatValue(f.value, f), mono: !!f.mono,
    }))
  }
  if (data && typeof data === 'object' && !Array.isArray(data)) {
    return Object.entries(data).map(([k, v]) => ({
      label: humanize(k), value: formatValue(v),
    }))
  }
  return []
}

export function tableColumns(panel) {
  if (Array.isArray(panel.columns) && panel.columns.length) {
    return panel.columns.map((c) => ({ key: c.key, label: c.label || humanize(c.key) }))
  }
  const first = rows(panel)[0]
  if (!first) return []
  return Object.keys(first).map((k) => ({ key: k, label: humanize(k) }))
}

export function cell(row, col) {
  return formatValue(row[col.key], col)
}

export function badges(panel) {
  const data = panel._data
  const list = Array.isArray(data) ? data : (data && data.badges) || []
  return list.map((b) => ({ label: b.label, color: b.color }))
}

// Header status rollup for a card. A panel opts in with
// status: { key, levels: { <rowvalue>: 'critical'|'warning'|'ok'|'unknown' } }.
// The card header then shows a single green/yellow/red dot reflecting the worst
// row: any critical -> red, else any warning -> yellow, else ok -> green. A
// value not in levels is treated as unknown and does not raise the level.
export const STATUS_RANK = { ok: 1, unknown: 1, warning: 2, critical: 3 }
export const STATUS_COLOR = {
  ok: '#2dce89',
  warning: '#ffc107',
  critical: '#f5365c',
  unknown: '#6c757d',
}

export function rollupStatus(panel) {
  const status = panel && panel.status
  if (!status || !status.key) return null
  const items = rows(panel)
  if (!items.length) return null
  const levels = status.levels || {}
  let worst = 'ok'
  let sawKnown = false
  for (const item of items) {
    const level = levels[item[status.key]]
    if (!level) continue
    sawKnown = true
    if (STATUS_RANK[level] > STATUS_RANK[worst]) worst = level
  }
  if (!sawKnown) return null
  return { level: worst, color: STATUS_COLOR[worst] || STATUS_COLOR.unknown }
}

// tabs: [{ label, fields: [{label, value, mono}] }]. One section is shown at a
// time, so a panel with 30 values stays the height of its largest section
// instead of dragging one multicol column far past the other.
//
// A section may instead carry { columns, rows, empty } and render as a table.
// This exists so two tables that belong side by side for the reader but share
// NO key can sit in one card - Storage is per volume, Disk health is per
// physical device. The sections are independent tables by design: nothing here
// reconciles rows across them, unlike the mapped-drive merge where two sources
// described the same drive.
export function tabSections(panel) {
  const data = panel._data
  const sections = (data && Array.isArray(data.sections)) ? data.sections : []
  return sections
    .map((s) => {
      if (Array.isArray(s.columns) && s.columns.length) {
        return {
          label: s.label,
          columns: s.columns.map((c) => ({ key: c.key, label: c.label || humanize(c.key) })),
          rows: Array.isArray(s.rows) ? s.rows : [],
          empty: s.empty || '',
          fields: [],
        }
      }
      return {
        label: s.label,
        fields: (s.fields || []).map((f) => ({
          label: f.label, value: formatValue(f.value, f), mono: !!f.mono,
        })),
      }
    })
    // A table section declares its columns up front, so it survives having no
    // rows and shows its own empty message. Dropping it would take the tab with
    // it and read as "this machine has no disks" rather than "nothing reported".
    .filter((s) => s.fields.length > 0 || (s.columns && s.columns.length > 0))
}

// Inline row action for a list panel. A monitored services/processes row may
// carry action: { running, start, stop, status } when it has a registered
// command (e.g. MTConnect). The card renders a single toggle on that row: when
// running it offers Stop, otherwise Start. Rows with no action are badge-only.
// commandendpoint on the panel is where the enqueue POST goes.
export function rowAction(panel, item) {
  const action = item && item.action
  if (!action || (!action.start && !action.stop)) return null
  const running = action.running === true
  return {
    running,
    // The action name to enqueue for the primary toggle button.
    toggle: running ? action.stop : action.start,
    toggleLabel: running ? 'Stop' : 'Start',
    // status is a non-mutating probe, always available when declared.
    status: action.status || null,
    // Generic actions (service_*/process_*) carry the subject to act on; fixed
    // actions (mtconnect_*) leave this null.
    target: action.target || null,
    // The declared enqueue endpoint template; the caller substitutes assetid.
    endpoint: panel.commandendpoint || null,
  }
}

// A table needs the full card width. `table` panels get it via panel.render,
// but a `tabs` panel only needs it when one of its sections is a table, and
// that is not knowable from the declaration - it depends on fetched data.
export function spansFullWidth(panel) {
  if (!panel) return false
  if (panel.render === 'table') return true
  if (panel.render !== 'tabs') return false
  return tabSections(panel).some((s) => (s.columns || []).length > 0)
}

// A panel declaring `empty` is asking to stay visible with nothing in it and
// say so - "No installed software reported." is an answer, where an absent
// card is a question. `list` honoured that and `table` did not, for no reason
// anybody wrote down, so a table panel with an empty message still vanished.
// It matters more now that a panel can be the only thing in a tab: the tab
// itself disappears with it.
export function panelVisible(panel) {
  if (panel.render === 'tabs') return tabSections(panel).length > 0
  if (panel.render === 'list') return rows(panel).length > 0 || !!panel.empty
  if (panel.render === 'keyvalue') return keyvalueFields(panel).length > 0
  if (panel.render === 'table') return rows(panel).length > 0 || !!panel.empty
  if (panel.render === 'badge') return badges(panel).length > 0
  if (panel.render === 'operatorreports') return rows(panel).length > 0 || !!panel.empty
  return false
}