import type { SystemLabelTemplate, SystemTemplateElementBase } from '../print/types/printer'
import { resolveTemplateDefaultValueForElement } from './printInputOffset'
import { applyNutritionDefaultJsonToConfig } from './nutritionDefaultsMerge'

function asRecord(v: unknown): Record<string, unknown> {
  if (v != null && typeof v === 'object' && !Array.isArray(v)) return v as Record<string, unknown>
  return {}
}

function normalizeConfig(raw: unknown): Record<string, unknown> {
  if (raw == null) return {}
  if (typeof raw === 'string') {
    const t = raw.trim()
    if (!t) return {}
    try {
      const parsed = JSON.parse(t) as unknown
      if (parsed != null && typeof parsed === 'object' && !Array.isArray(parsed)) {
        return { ...(parsed as Record<string, unknown>) }
      }
    } catch {
      return {}
    }
    return {}
  }
  const o = asRecord(raw)
  return { ...o }
}

/**
 * 落库/列表返回的 element 可能把 text、src、fontSize 等摊在根上，仅 `config` 为空或不全；
 * 合并进 config 后打印与预览才能读到样式与图片地址。
 */
function mergeFlatElementFieldsIntoConfig(
  e: Record<string, unknown>,
  cfg: Record<string, unknown>,
): Record<string, unknown> {
  const out = { ...cfg }
  const keys = [
    'text',
    'Text',
    'prefix',
    'Prefix',
    'suffix',
    'Suffix',
    'fontSize',
    'FontSize',
    'textAlign',
    'TextAlign',
    'fontFamily',
    'fontWeight',
    'color',
    'Color',
    'src',
    'Src',
    'url',
    'Url',
    'data',
    'Data',
    'value',
    'Value',
    'unit',
    'Unit',
    'format',
    'Format',
    'decimal',
    'Decimal',
    'inputType',
    'InputType',
    'offsetDays',
    'OffsetDays',
    'multipleOptionId',
    'MultipleOptionId',
    'multipleOptionName',
    'MultipleOptionName',
    'selectedOptionValues',
    'SelectedOptionValues',
    'errorLevel',
    'scaleMode',
    'showText',
    'placeholder',
    'Placeholder',
  ] as const
  for (const k of keys) {
    const existing = out[k]
    const has =
      existing !== undefined &&
      existing !== null &&
      !(typeof existing === 'string' && String(existing).trim() === '')
    if (has) continue
    const v = e[k]
    if (v !== undefined && v !== null && !(typeof v === 'string' && String(v).trim() === '')) {
      out[k] = v as unknown
    }
  }
  return out
}

const TEXT_PRODUCT_PLACEHOLDERS = new Set(['', '文本', 'text', 'Text', 'TEXT', 'Label', 'label'])

/**
 * Web 端设计器里 TEXT_PRODUCT 若为 FIXED 且占位「文本」，预览页用当前商品名覆盖（与列表传入的 productName 一致）。
 */
export function overlayProductNameOnPreviewTemplate(
  template: SystemLabelTemplate,
  productName: string | undefined
): SystemLabelTemplate {
  const name = (productName ?? '').trim()
  if (!name) return template
  const elements = (template.elements || []).map((el) => {
    const type = String(el.type || '').toUpperCase()
    if (type !== 'TEXT_PRODUCT') return el
    const raw = String((el.config as any)?.text ?? (el.config as any)?.Text ?? '').trim()
    if (raw && !TEXT_PRODUCT_PLACEHOLDERS.has(raw)) return el
    return {
      ...el,
      config: { ...(el.config || {}), text: name },
    }
  })
  return { ...template, elements }
}

/**
 * 解析接口 `labelSizeText`（如 `2"x2"`、`6.00x4.00cm`、`2.00*2.00"`）。
 * 无单位后缀时默认 **inch**（与历史 `2"x2"` 一致）。
 */
export function parseLabelSizeText(
  raw: string | null | undefined
): { width: number; height: number; unit: 'inch' | 'mm' | 'cm' | 'px' } | null {
  if (raw == null) return null
  let s = String(raw).trim()
  if (!s) return null
  s = s.replace(/["'\u201C\u201D\u2018\u2019\u2032\u2033]/g, '').replace(/\s+/g, '').toLowerCase()
  const m = s.match(/^(\d+(?:\.\d+)?)[*×x](\d+(?:\.\d+)?)(mm|cm|inch|in|px)?$/i)
  if (!m) return null
  const w = Number(m[1])
  const h = Number(m[2])
  if (!Number.isFinite(w) || !Number.isFinite(h) || w <= 0 || h <= 0) return null
  const suf = (m[3] || '').toLowerCase()
  let unit: 'inch' | 'mm' | 'cm' | 'px' = 'inch'
  if (suf === 'mm') unit = 'mm'
  else if (suf === 'cm') unit = 'cm'
  else if (suf === 'px') unit = 'px'
  else if (suf === 'in' || suf === 'inch') unit = 'inch'
  return { width: w, height: h, unit }
}

/**
 * 用 `labelSizeText` 覆盖模板物理宽高（解析失败则保持原模板）。
 * 注意：App 预览画布应以接口 **template.width / height / unit** 为准（见 preview 页），勿与本函数同时叠加强制覆盖。
 */
export function applyLabelSizeTextToTemplate(
  template: SystemLabelTemplate,
  labelSizeText: string | null | undefined
): SystemLabelTemplate {
  const parsed = parseLabelSizeText(labelSizeText)
  if (!parsed) return template
  return {
    ...template,
    unit: parsed.unit,
    width: parsed.width,
    height: parsed.height,
  }
}

/**
 * 从预览接口响应中取出 `templateProductDefaultValues`（elementId → 字符串，兼容 PascalCase / 嵌套 data）。
 */
export function extractTemplateProductDefaultValuesFromPreviewPayload(payload: unknown): Record<string, string> {
  const tryLayer = (layer: unknown): Record<string, string> | null => {
    if (layer == null || typeof layer !== 'object' || Array.isArray(layer)) return null
    const L = layer as Record<string, unknown>
    const raw = L.templateProductDefaultValues ?? L.TemplateProductDefaultValues
    if (raw == null || typeof raw !== 'object' || Array.isArray(raw)) return null
    const out: Record<string, string> = {}
    for (const [k, v] of Object.entries(raw as Record<string, unknown>)) {
      const key = String(k).trim()
      if (!key) continue
      if (v == null) out[key] = ''
      else if (typeof v === 'string') out[key] = v
      else if (typeof v === 'number' || typeof v === 'boolean') out[key] = String(v)
      else out[key] = JSON.stringify(v)
    }
    return Object.keys(out).length ? out : null
  }

  const unwrapTemplateNode = (raw: unknown): Record<string, unknown> | null => {
    if (raw == null) return null
    if (typeof raw === 'string') {
      const s = raw.trim()
      if (!s) return null
      try {
        const p = JSON.parse(s) as unknown
        if (p != null && typeof p === 'object' && !Array.isArray(p)) return p as Record<string, unknown>
      } catch {
        return null
      }
      return null
    }
    if (typeof raw === 'object' && !Array.isArray(raw)) return raw as Record<string, unknown>
    return null
  }

  /** 多来源合并：后者覆盖前者，便于「嵌套在 template 内」与「与 template 平级」同时存在时取全。 */
  const mergeMaps = (...maps: (Record<string, string> | null | undefined)[]): Record<string, string> => {
    const out: Record<string, string> = {}
    for (const m of maps) {
      if (!m) continue
      for (const [k, v] of Object.entries(m)) {
        const key = String(k).trim()
        if (!key) continue
        out[key] = v
      }
    }
    return out
  }

  if (payload == null || typeof payload !== 'object') return {}
  const r = payload as Record<string, unknown>
  const nested = r.data ?? r.Data
  const inner =
    nested != null && typeof nested === 'object' && !Array.isArray(nested)
      ? (nested as Record<string, unknown>)
      : null

  const innerTpl = inner ? unwrapTemplateNode(inner.template ?? inner.Template) : null
  const rootTpl = unwrapTemplateNode(r.template ?? r.Template)

  return mergeMaps(
    innerTpl ? tryLayer(innerTpl) : null,
    rootTpl ? tryLayer(rootTpl) : null,
    inner ? tryLayer(inner) : null,
    tryLayer(r),
    tryLayer(payload),
  )
}

function isTemplateSectionScanElement(el: SystemTemplateElementBase): boolean {
  const cfg = el.config || {}
  const typeAdd = String(
    (el as { typeAdd?: string }).typeAdd ??
    cfg.typeAdd ??
    cfg.TypeAdd ??
    el.type ??
    '',
  )
    .trim()
    .toLowerCase()
  if (!typeAdd.startsWith('template_')) return false
  const t = String(el.type || '').toUpperCase()
  return t === 'BARCODE' || t === 'QRCODE'
}

/** 预览/打印接口响应中的产品 codeValue（兼容 PascalCase / data 嵌套） */
export function extractProductCodeValueFromPreviewPayload(payload: unknown): string {
  const readLayer = (layer: Record<string, unknown> | null | undefined): string => {
    if (!layer) return ''
    const cv =
      layer.codeValue ??
      layer.CodeValue ??
      layer.productCodeValue ??
      layer.ProductCodeValue
    if (cv != null && String(cv).trim()) return String(cv).trim()
    const prod = layer.product ?? layer.Product
    if (prod != null && typeof prod === 'object' && !Array.isArray(prod)) {
      const p = prod as Record<string, unknown>
      const nested = p.codeValue ?? p.CodeValue
      if (nested != null && String(nested).trim()) return String(nested).trim()
    }
    return ''
  }
  if (payload == null || typeof payload !== 'object') return ''
  const r = payload as Record<string, unknown>
  const nested = r.data ?? r.Data
  const inner =
    nested != null && typeof nested === 'object' && !Array.isArray(nested)
      ? (nested as Record<string, unknown>)
      : null
  return (
    readLayer(inner) ||
    readLayer(r) ||
    ''
  )
}

/** 将产品 codeValue 写入 Template 分组下的 BARCODE / QRCODE（覆盖模板内静态 data） */
export function applyProductCodeValueToTemplateScanElements(
  template: SystemLabelTemplate,
  codeValue: string | null | undefined,
): SystemLabelTemplate {
  const cv = String(codeValue ?? '').trim()
  if (!cv) return template
  const elements = (template.elements || []).map((el) => {
    if (!isTemplateSectionScanElement(el)) return el
    const cfg = { ...(el.config || {}) } as Record<string, unknown>
    cfg.data = cv
    cfg.Data = cv
    if (String(el.type || '').toUpperCase() === 'BARCODE') {
      cfg.barcodeData = cv
      cfg.BarcodeData = cv
      cfg.value = cv
      cfg.Value = cv
      cfg.content = cv
      cfg.Content = cv
    }
    return { ...el, config: cfg }
  })
  return { ...template, elements }
}

/**
 * 将平台录入的默认值合并进模板元素 config，供画布预览（键与 elements[].id 一致）。
 */
export function applyTemplateProductDefaultValuesToTemplate(
  template: SystemLabelTemplate,
  defaults: Record<string, string>
): SystemLabelTemplate {
  const keys = Object.keys(defaults)
  if (!keys.length) return template
  const elements = (template.elements || []).map((el) => {
    const byName = (el.elementName ?? '').trim()
    const v =
      defaults[el.id] ?? (byName ? defaults[byName] : undefined)
    if (v === undefined) return el
    const type = String(el.type || '').toUpperCase()
    const cfg = { ...(el.config || {}) } as Record<string, any>

    if (type === 'IMAGE' || type === 'LOGO') {
      cfg.src = v
      cfg.url = v
      cfg.Src = v
      cfg.Url = v
      return { ...el, config: cfg }
    }
    if (type === 'BARCODE' || type === 'QRCODE') {
      cfg.data = v
      cfg.Data = v
      if (type === 'BARCODE') {
        cfg.barcodeData = v
        cfg.BarcodeData = v
        cfg.value = v
        cfg.Value = v
        cfg.content = v
        cfg.Content = v
      }
      return { ...el, config: cfg }
    }
    if (type === 'WEIGHT') {
      cfg.value = v
      cfg.Value = v
      cfg.text = v
      cfg.Text = v
      return { ...el, config: cfg }
    }

    if (type === 'DATE' || type === 'TIME' || type === 'DURATION') {
      const text = resolveTemplateDefaultValueForElement(el, v, new Date())
      cfg.text = text
      cfg.Text = text
      return { ...el, config: cfg }
    }

    if (type === 'NUTRITION') {
      const s = String(v).trim()
      if (s.startsWith('{')) {
        const merged = applyNutritionDefaultJsonToConfig(cfg, s)
        return { ...el, config: merged }
      }
      cfg.text = s
      cfg.Text = s
      return { ...el, config: cfg }
    }

    cfg.text = v
    cfg.Text = v
    return { ...el, config: cfg }
  })
  return { ...template, elements }
}

function elementArrayLength (o: Record<string, unknown>): number {
  const a = o.elements ?? o.Elements
  return Array.isArray(a) ? a.length : 0
}

/**
 * 列表 `renderTemplateJson` / 接口 9 落库可能是：① 根上直接 elements；② 包在 `printInputJson`；③ 包在 `template`（对象或 JSON 字符串）；
 * ④ 根上既有 `template: {}` 又有 `elements` 时，**不能**误用空 template 丢掉根级 elements（会导致重打无字、无图）。
 */
function pickTemplateRootRecord (payload: Record<string, unknown>): Record<string, unknown> {
  const unwrapTemplateKey = (raw: unknown): Record<string, unknown> | null => {
    if (raw == null) return null
    if (typeof raw === 'string') {
      const s = raw.trim()
      if (!s) return null
      try {
        const p = JSON.parse(s) as unknown
        if (p != null && typeof p === 'object' && !Array.isArray(p)) return p as Record<string, unknown>
      } catch {
        return null
      }
      return null
    }
    if (typeof raw === 'object' && !Array.isArray(raw)) return raw as Record<string, unknown>
    return null
  }

  if (elementArrayLength(payload) > 0) return payload

  const pi = payload.printInputJson ?? payload.PrintInputJson
  if (pi != null && typeof pi === 'object' && !Array.isArray(pi)) {
    const p = pi as Record<string, unknown>
    if (elementArrayLength(p) > 0) return p
  }

  const nested =
    unwrapTemplateKey(payload.template ?? payload.Template) ?? asRecord(payload.template ?? payload.Template)
  if (elementArrayLength(nested) > 0) return nested

  if (pi != null && typeof pi === 'object' && !Array.isArray(pi)) return pi as Record<string, unknown>
  if (Object.keys(nested).length > 0) return nested
  return payload
}

/**
 * 将接口 8.2 返回的 template（或整段 DTO）规范为 SystemLabelTemplate，供打印适配器与预览画布使用。
 */
export function normalizeLabelTemplateFromPreviewApi(payload: unknown): SystemLabelTemplate | null {
  if (payload == null || typeof payload !== 'object') return null
  let root = payload as Record<string, unknown>
  const wrapped = root.data ?? root.Data
  if (wrapped != null && typeof wrapped === 'object' && !Array.isArray(wrapped)) {
    root = wrapped as Record<string, unknown>
  }
  const t = pickTemplateRootRecord(root)
  const elementsRaw = t.elements ?? t.Elements
  if (!Array.isArray(elementsRaw)) return null

  const elements: SystemTemplateElementBase[] = (elementsRaw as unknown[]).map((el, index) => {
    const e = asRecord(el)
    let cfg = normalizeConfig(
      e.config ?? e.Config ?? e.ConfigJson ?? e.configJson ?? e.ConfigString,
    )
    cfg = mergeFlatElementFieldsIntoConfig(e, cfg)
    const type = String(e.type ?? e.elementType ?? e.ElementType ?? 'TEXT_STATIC')
    const vst = e.valueSourceType ?? e.ValueSourceType
    const ik = e.inputKey ?? e.InputKey
    const en = e.elementName ?? e.ElementName
    return {
      id: String(e.id ?? e.Id ?? `el-${index}`),
      type,
      x: Number(e.x ?? e.posX ?? e.PosX ?? 0),
      y: Number(e.y ?? e.posY ?? e.PosY ?? 0),
      width: Number(e.width ?? e.Width ?? 0),
      height: Number(e.height ?? e.Height ?? 0),
      rotation: String(e.rotation ?? e.Rotation ?? 'horizontal') as 'horizontal' | 'vertical',
      border: String(e.border ?? e.BorderType ?? e.borderType ?? 'none'),
      config: cfg as Record<string, any>,
      zIndex: Number(e.zIndex ?? e.ZIndex ?? 0),
      orderNum: Number(e.orderNum ?? e.OrderNum ?? index),
      valueSourceType: vst != null ? String(vst) : undefined,
      inputKey: ik != null && String(ik).trim() !== '' ? String(ik).trim() : undefined,
      elementName: en != null && String(en).trim() !== '' ? String(en).trim() : undefined,
    } as SystemTemplateElementBase & { zIndex: number; orderNum: number }
  })

  const unitRaw = String(t.unit ?? t.Unit ?? 'inch').toLowerCase()
  const unit = (unitRaw === 'mm' || unitRaw === 'cm' || unitRaw === 'px' ? unitRaw : 'inch') as
    | 'inch'
    | 'mm'
    | 'cm'
    | 'px'

  return {
    id: String(t.id ?? t.Id ?? 'preview'),
    name: String(t.name ?? t.Name ?? 'Label'),
    labelType: String(t.labelType ?? t.LabelType ?? ''),
    unit,
    width: Number(t.width ?? t.Width ?? 2),
    height: Number(t.height ?? t.Height ?? 2),
    appliedLocation: String(t.appliedLocation ?? t.AppliedLocation ?? 'ALL'),
    showRuler: !!(t.showRuler ?? t.ShowRuler),
    showGrid: !!(t.showGrid ?? t.ShowGrid),
    elements,
  }
}

export function sortElementsForPreview(
  elements: SystemTemplateElementBase[]
): SystemTemplateElementBase[] {
  return [...elements].sort((a, b) => {
    const za = Number((a as any).zIndex ?? 0)
    const zb = Number((b as any).zIndex ?? 0)
    if (za !== zb) return za - zb
    const oa = Number((a as any).orderNum ?? 0)
    const ob = Number((b as any).orderNum ?? 0)
    return oa - ob
  })
}