import type { SystemLabelTemplate, SystemTemplateElementBase } from '../print/types/printer'

function normalizePaletteSlug (raw: string): string {
  return String(raw ?? '').trim().toLowerCase().replace(/[^a-z0-9]+/g, '')
}

function readTypeAdd (el: SystemTemplateElementBase): string {
  return String((el as SystemTemplateElementBase & { typeAdd?: string }).typeAdd ?? '').trim().toLowerCase()
}

/** 是否为模板「Entered Automatically → Label ID」控件 */
export function isLabelIdTemplateElement (el: SystemTemplateElementBase): boolean {
  const typeAdd = readTypeAdd(el)
  if (typeAdd.startsWith('auto_') && typeAdd.includes('label id')) return true

  const en = normalizePaletteSlug(String(el.elementName ?? ''))
  if (/^labelid\d*$/.test(en)) return true

  const vst = String(el.valueSourceType ?? '').toUpperCase()
  const type = String(el.type ?? '').toUpperCase()
  if (vst === 'AUTO_DB' && type === 'TEXT_STATIC' && /^labelid/.test(en)) return true

  return false
}

export function templateIncludesLabelIdElement (
  template: SystemLabelTemplate | null | undefined,
): boolean {
  return !!(template?.elements?.some(isLabelIdTemplateElement))
}

/** 按元素 config.prefix 拼展示行（避免重复前缀） */
export function formatLabelIdDisplayLine (
  rawId: string,
  config?: Record<string, unknown>,
): string {
  const id = String(rawId ?? '').trim()
  const prefix = String(config?.prefix ?? config?.Prefix ?? 'LABEL ID: ').trim()
  if (!id) return prefix ? `${prefix}—` : '—'
  const lowerPrefix = prefix.toLowerCase()
  if (prefix && id.toLowerCase().startsWith(lowerPrefix)) return id
  if (!prefix) return id
  const needsSpace = !prefix.endsWith(':') && !prefix.endsWith(' ')
  return needsSpace ? `${prefix} ${id}` : `${prefix}${id}`
}

/** 将 Label ID 写入模板内对应 AUTO 控件（预览/出纸同源） */
export function applyLabelIdDisplayToTemplate (
  template: SystemLabelTemplate,
  labelIdText: string,
): SystemLabelTemplate {
  const elements = (template.elements || []).map((el) => {
    if (!isLabelIdTemplateElement(el)) return el
    const cfg = { ...(el.config || {}) } as Record<string, unknown>
    const line = formatLabelIdDisplayLine(labelIdText, cfg)
    return {
      ...el,
      config: { ...cfg, text: line, Text: line },
    }
  })
  return { ...template, elements }
}