function handleConditions (conditions: Condition[]) {
  if (conditions.length === 1) {
    const ct = conditions[0]
    ct.path.replaceWith(
      t.jSXExpressionContainer(
        t.logicalExpression('&&', ct.tester.expression, cloneDeep(ct.path.node))
      )
    )
  }
  if (conditions.length > 1) {
    const lastLength = conditions.length - 1
    const lastCon = conditions[lastLength]
    let lastAlternate: t.Expression = cloneDeep(lastCon.path.node)
    if (lastCon.condition === WX_ELSE_IF) {
      lastAlternate = t.logicalExpression(
        '&&',
        lastCon.tester.expression,
        lastAlternate
      )
    }
    const node = conditions
      .slice(0, lastLength)
      .reduceRight((acc: t.Expression, condition) => {
        return t.conditionalExpression(
          condition.tester.expression,
          cloneDeep(condition.path.node),
          acc
        )
      }, lastAlternate)
    conditions[0].path.replaceWith(t.jSXExpressionContainer(node))
    conditions.slice(1).forEach(c => c.path.remove())
  }
}

function parseText (node: Text) {
  const { type, content } = parseContent(node.content)
  if (type === 'raw') {
    return t.jSXText(content)
  }
  return t.jSXExpressionContainer(buildTemplate(content))
}

function transformLoop (
  name: string,
  attr: NodePath<t.JSXAttribute>,
  jsx: NodePath<t.JSXElement>,
  value: AttrValue
) {
  if (name !== WX_FOR) {
    return
  }
  if (!value || !t.isJSXExpressionContainer(value)) {
    throw new Error('wx:for 的值必须使用 "{{}}"  包裹')
  }
  attr.remove()
  let item = t.stringLiteral('item')
  let index = t.stringLiteral('index')
  jsx
    .get('openingElement')
    .get('attributes')
    .forEach(p => {
      const node = p.node
      if (node.name.name === WX_FOR_ITEM) {
        if (!node.value || !t.isStringLiteral(node.value)) {
          throw new Error(WX_FOR_ITEM + ' 的值必须是一个字符串')
        }
        item = node.value
        p.remove()
      }
      if (node.name.name === WX_FOR_INDEX) {
        if (!node.value || !t.isStringLiteral(node.value)) {
          throw new Error(WX_FOR_INDEX + ' 的值必须是一个字符串')
        }
        index = node.value
        p.remove()
      }
      if (node.name.name === WX_KEY) {
        p.get('name').replaceWith(t.jSXIdentifier('key'))
      }
    })

  const replacement = t.jSXExpressionContainer(
    t.callExpression(
      t.memberExpression(value.expression, t.identifier('map')),
      [
        t.arrowFunctionExpression(
          [t.identifier(item.value), t.identifier(index.value)],
          t.blockStatement([t.returnStatement(jsx.node)])
        )
      ]
    )
  )

  const block = buildBlockElement()
  block.children = [replacement]
  jsx.replaceWith(block)
}

function parseText (node: Text, tagName?: string) {
  if (tagName === 'wxs') {
    return t.jSXText(node.content)
  }
  const { type, content } = parseContent(node.content)
  if (type === 'raw') {
    const text = content.replace(/([{}]+)/g,"{'$1'}")
    return t.jSXText(text)
  }
  return t.jSXExpressionContainer(buildTemplate(content))
}

function parseAttribute (attr: Attribute) {
  const { key, value } = attr

  let jsxValue: null | t.JSXExpressionContainer | t.StringLiteral = null

  if (value) {
    const { type, content } = parseContent(value)
    jsxValue =
      type === 'raw'
        ? t.stringLiteral(content)
        : t.jSXExpressionContainer(buildTemplate(content))
  }

  const jsxKey = handleAttrKey(key)
  if (/^on[A-Z]/.test(jsxKey) && jsxValue && t.isStringLiteral(jsxValue)) {
    jsxValue = t.jSXExpressionContainer(
      t.memberExpression(t.thisExpression(), t.identifier(jsxValue.value))
    )
  }
  return t.jSXAttribute(t.jSXIdentifier(jsxKey), jsxValue)
}

function parseNode (node: AllKindNode) {
  if (node.type === NodeType.Text) {
    return parseText(node)
  } else if (node.type === NodeType.Comment) {
    const emptyStatement = t.jSXEmptyExpression()
    emptyStatement.innerComments = [{
      type: 'CommentBlock',
      value: ' ' + node.content + ' '
    }] as any[]
    return t.jSXExpressionContainer(emptyStatement)
  }
  return parseElement(node)
}

function transformIf (
  name: string,
  attr: NodePath<t.JSXAttribute>,
  jsx: NodePath<t.JSXElement>,
  value: AttrValue
) {
  if (name !== WX_IF) {
    return
  }
  const conditions: Condition[] = []
  let siblings: NodePath<t.Node>[] = []
  try {
    siblings = jsx.getAllNextSiblings().filter(s => !(s.isJSXExpressionContainer() && s.get('expression').isJSXEmptyExpression()))
  } catch (error) {
    return
  }
  if (value === null || !t.isJSXExpressionContainer(value)) {
    // tslint:disable-next-line
    console.error('wx:if 的值需要用双括号 `{{}}` 包裹它的值')
    if (value && t.isStringLiteral(value)) {
      value = t.jSXExpressionContainer(buildTemplate(value.value))
    }
  }
  conditions.push({
    condition: WX_IF,
    path: jsx,
    tester: value as t.JSXExpressionContainer
  })
  attr.remove()
  for (let index = 0; index < siblings.length; index++) {
    const sibling = siblings[index]
    const next = cloneDeep(siblings[index + 1])
    const currMatches = findWXIfProps(sibling)
    const nextMatches = findWXIfProps(next)
    if (currMatches === null) {
      break
    }
    conditions.push({
      condition: currMatches.reg.input as string,
      path: sibling as any,
      tester: currMatches.tester as t.JSXExpressionContainer
    })
    if (nextMatches === null) {
      break
    }
  }
  handleConditions(conditions)
}

export function parseModule (jsx: NodePath<t.JSXElement>, dirPath: string, type: 'include' | 'import') {
  const openingElement = jsx.get('openingElement')
  const attrs = openingElement.get('attributes')
  const src = attrs.find(attr => attr.get('name').isJSXIdentifier({ name: 'src' }))
  if (!src) {
    throw new Error(`${type} 标签必须包含 \`src\` 属性`)
  }
  const value = src.get('value')
  if (!value.isStringLiteral()) {
    throw new Error(`${type} 标签的 src 属性值必须是一个字符串`)
  }
  const srcValue = value.node.value
  if (type === 'import') {
    const wxml = getWXMLsource(dirPath, srcValue, type)
    const { imports } = parseWXML(resolve(dirPath, srcValue), wxml, true)
    try {
      jsx.remove()
    } catch (error) {
     //
    }
    return imports
  } else {
    const { wxml } = parseWXML(dirPath, getWXMLsource(dirPath, srcValue, type), true)
    const block = buildBlockElement()
    try {
      if (wxml) {
        block.children = [wxml as any]
        jsx.replaceWith(wxml)
      } else {
        block.children = [t.jSXExpressionContainer(t.jSXEmptyExpression())]
        jsx.replaceWith(block)
      }
    } catch (error) {
      //
    }
  }
}

export function parseTemplate (path: NodePath<t.JSXElement>, dirPath: string) {
  const openingElement = path.get('openingElement')
  const attrs = openingElement.get('attributes')
  const is = attrs.find(attr => attr.get('name').isJSXIdentifier({ name: 'is' }))
  const data = attrs.find(attr => attr.get('name').isJSXIdentifier({ name: 'data' }))
  // const spread = attrs.find(attr => attr.get('name').isJSXIdentifier({ name: 'spread' }))
  const name = attrs.find(attr => attr.get('name').isJSXIdentifier({ name: 'name' }))
  const refIds = new Set<string>()
  if (name) {
    const value = name.node.value
    if (value === null || !t.isStringLiteral(value)) {
      throw new Error('template 的 `name` 属性只能是字符串')
    }
    const className = pascalName(value.value) + pascalName(basename(dirPath))
    path.traverse({
      Identifier (p) {
        if (!p.isReferencedIdentifier()) {
          return
        }
        const jsxExprContainer = p.findParent(p => p.isJSXExpressionContainer())
        if (!jsxExprContainer || !jsxExprContainer.isJSXExpressionContainer()) {
          return
        }
        refIds.add(p.node.name)
      }
    })

    const block = buildBlockElement()
    block.children = path.node.children
    let render: t.ClassMethod
    if (refIds.size === 0) {
      // 无状态组件
      render = buildRender(block, [], [])
    } else if (refIds.size === 1) {
      // 只有一个数据源
      render = buildRender(block, [], Array.from(refIds), Array.from(refIds)[0])
    } else {
      // 使用 ...spread
      render = buildRender(block, [], Array.from(refIds), [])
    }

    const classDecl = t.classDeclaration(
      t.identifier(className),
      t.memberExpression(t.identifier('Taro'), t.identifier('Component')),
      t.classBody([render!]),
      []
    )
    path.remove()
    return {
      name: className,
      ast: classDecl
    }
  } else if (is) {
    const value = is.node.value
    if (!value) {
      throw new Error('template 的 `is` 属性不能为空')
    }
    if (t.isStringLiteral(value)) {
      const className = pascalName(value.value)
      let attributes: t.JSXAttribute[] = []
      if (data) {
        attributes.push(data.node)
      }
      path.replaceWith(t.jSXElement(
        t.jSXOpeningElement(t.jSXIdentifier(className), attributes),
        t.jSXClosingElement(t.jSXIdentifier(className)),
        [],
        true
      ))
    } else if (t.isJSXExpressionContainer(value)) {
      if (t.isStringLiteral(value.expression)) {
        const className = pascalName(value.expression.value)
        let attributes: t.JSXAttribute[] = []
        if (data) {
          attributes.push(data.node)
        }
        path.replaceWith(t.jSXElement(
          t.jSXOpeningElement(t.jSXIdentifier(className), attributes),
          t.jSXClosingElement(t.jSXIdentifier(className)),
          [],
          true
        ))
      } else if (t.isConditional(value.expression)) {
        const { test, consequent, alternate } = value.expression
        if (!t.isStringLiteral(consequent) || !t.isStringLiteral(alternate)) {
          throw new Error('当 template is 标签是三元表达式时，他的两个值都必须为字符串')
        }
        let attributes: t.JSXAttribute[] = []
        if (data) {
          attributes.push(data.node)
        }
        const block = buildBlockElement()
        block.children = [t.jSXExpressionContainer(t.conditionalExpression(
          test,
          t.jSXElement(
            t.jSXOpeningElement(t.jSXIdentifier('Template'), attributes.concat(
              [t.jSXAttribute(t.jSXIdentifier('is'), consequent)]
            )),
            t.jSXClosingElement(t.jSXIdentifier('Template')),
            [],
//.........这里部分代码省略.........

//.........这里部分代码省略.........
        } else if (t.isReturnStatement(parentNode)) {
          if (!isFinalReturn) {
            const caller = parentPath.findParent(p => p.isCallExpression())
            if (caller.isCallExpression()) {
              const callee = caller.node.callee
              if (
                t.isMemberExpression(callee) &&
                t.isIdentifier(callee.property) &&
                callee.property.name === 'map'
              ) {
                let ary = callee.object
                const blockStatementPath = parentPath.findParent(p => p.isBlockStatement()) as NodePath<t.BlockStatement>
                const body = blockStatementPath.node.body
                let stateToBeAssign = new Set<string>()
                for (const statement of body) {
                  if (t.isVariableDeclaration(statement)) {
                    for (const dcl of statement.declarations) {
                      if (t.isIdentifier(dcl.id)) {
                        const scope = blockStatementPath.scope
                        const stateName = scope.generateUid(LOOP_STATE)
                        stateToBeAssign.add(stateName)
                        blockStatementPath.scope.rename(dcl.id.name, stateName)
                      }
                    }
                  }
                }
                if (t.isCallExpression(ary) || isContainFunction(caller.get('callee').get('object'))) {
                  const variableName = `anonymousState_${bodyScope.generateUid()}`
                  caller.getStatementParent().insertBefore(
                    buildConstVariableDeclaration(variableName, ary)
                  )
                  ary = t.identifier(variableName)
                }
                setJSXAttr(jsxElementPath.node, Adapter.for, t.jSXExpressionContainer(ary))
                const [func] = caller.node.arguments
                if (
                  t.isFunctionExpression(func) ||
                  t.isArrowFunctionExpression(func)
                ) {
                  const [item, index] = func.params
                  if (t.isIdentifier(item)) {
                    setJSXAttr(
                      jsxElementPath.node,
                      Adapter.forItem,
                      t.stringLiteral(item.name)
                    )
                    loopScopes.add(item.name)
                  } else {
                    setJSXAttr(
                      jsxElementPath.node,
                      Adapter.forItem,
                      t.stringLiteral('__item')
                    )
                  }
                  if (t.isIdentifier(index)) {
                    setJSXAttr(
                      jsxElementPath.node,
                      Adapter.forIndex,
                      t.stringLiteral(index.name)
                    )
                    loopScopes.add(index.name)
                  }
                  caller.replaceWith(jsxElementPath.node)
                  if (statementParent) {
                    const name = findIdentifierFromStatement(
                      statementParent.node as t.VariableDeclaration