/**
 * 统一解析结点入参、出参：将 action 中的变量引用用 variableContext 解析为实际值。
 * 规则：{var}、{{var}} 为变量（替换为变量值），"hello" 为字符串字面量，"hello{var}" 为字符串+变量拼接。
 */
const setParser = require('./actions/set-parser.js')
const resolveValue = setParser.resolveValue
const replaceVariablesInString = setParser.replaceVariablesInString
const extractVarName = setParser.extractVarName

/** 视为入参的字段（会被解析）；inVars 由各结点按需解析（因部分结点将 inVars 某项作为输出变量名）。 */
const INPUT_KEYS = [
  'value', 'target', 'template', 'area', 'savePath', 'condition', 'delay', 'interval',
  'items', 'screenshot', 'region', 'method', 'clear', 'timeout', 'retry',
  'min', 'max', 'avatar1', 'avatar2', 'friendAvatar', 'avatar', 'path', 'filePath',
  'inputDataString', 'textVariable', 'senderVariable', 'appendMode',
  'summaryPrompt', 'historyPrompt', 'model', 'prompt', 'systemPrompt',
  'regionArea', 'saveDir', 'url', 'filename', 'imageUrl',
]

/**
 * 解析单值：先对字符串做 {{var}} 替换，再对整体做 {var} 引用解析
 */
function resolveInputValue(val, variableContext) {
  if (variableContext == null) return val
  if (typeof val === 'string') {
    const replaced = replaceVariablesInString(val, variableContext)
    let result = resolveValue(replaced, variableContext)
    if (result === val && /^[\w-]+$/.test(val) && variableContext[val] !== undefined) result = variableContext[val]
    return result
  }
  if (Array.isArray(val)) return val.map(item => resolveInputValue(item, variableContext))
  if (typeof val === 'object' && val !== null) {
    const out = {}
    for (const k in val) out[k] = resolveInputValue(val[k], variableContext)
    return out
  }
  return val
}

/**
 * 解析整条 action 的入参，返回新对象（不修改原 action）
 * @param {object} action - 原始或已 parse 的 action
 * @param {object} variableContext - 变量表
 * @returns {object} 入参解析后的 action 副本
 */
function resolveActionInputs(action, variableContext) {
  if (!action || typeof action !== 'object') return action
  if (!variableContext || typeof variableContext !== 'object') return Object.assign({}, action)

  const resolved = Object.assign({}, action)

  for (const key of INPUT_KEYS) {
    if (key in resolved && resolved[key] !== undefined && resolved[key] !== null) {
      resolved[key] = resolveInputValue(resolved[key], variableContext)
    }
  }

  if (resolved.inVars && Array.isArray(resolved.inVars)) {
    resolved.inVars = resolved.inVars.map((v) => resolveInputValue(v, variableContext))
  }
  if (resolved.outVars && Array.isArray(resolved.outVars)) {
    resolved.outVars = resolved.outVars.map((v) => (typeof v === 'string' ? extractVarName(v) : v))
  }

  if (resolved.condition && typeof resolved.condition === 'object' && !Array.isArray(resolved.condition)) {
    const c = resolved.condition
    if (c.interval != null) resolved.condition = Object.assign({}, c, { interval: resolveInputValue(c.interval, variableContext) })
    if (c.repeat != null) resolved.condition = Object.assign({}, resolved.condition, { repeat: resolveInputValue(c.repeat, variableContext) })
  }

  return resolved
}

module.exports = {
  resolveActionInputs,
  resolveInputValue,
}