import { CompletionItem, TextDocument, Position } from 'vscode'
import { Completion } from './Completion'
import * as vscode from 'vscode'
import { utils } from '../utils'
import { SubviewNameCompletion } from './SubviewNameCompletion'

export class SlotCompletion extends Completion {
  public completionArr: CompletionItem[] = []
  private svNameComplet: SubviewNameCompletion
  private triggerType: 'default' | 'afterColon' | 'outAccept' = 'default'
  private prevTriggerType: string = ''
  private prevAccept: { [key: string]: boolean } = {}
  constructor(svNameComplet: SubviewNameCompletion) {
    super()
    this.svNameComplet = svNameComplet
  }
  public validateContext(document: TextDocument, position: Position): boolean {
    const linePrefix = utils.getLinePrefix(document, position)
    const matchRes = linePrefix.match(/<Slot(.*?)accept="(.*)/)
    if (matchRes) {
      this.prevAccept = {}
      const acceptArr = matchRes[2].split(',')
      const lastAccept = acceptArr[acceptArr.length - 1]
      acceptArr.forEach((acceptItem) => {
        const splits = acceptItem.split(':')
        if (splits[1]) {
          this.prevAccept[splits[1]] = true
        }
      })
      if (lastAccept.includes(':')) {
        this.triggerType = 'afterColon'
      } else {
        this.triggerType = 'default'
      }
      return true
    }
    return false
  }
  public getCompletionArr() {
    if (this.prevTriggerType !== this.triggerType) {
      this.prevTriggerType = this.triggerType
      this.completionArr = this.svNameComplet.completionArr.map((el) => this.getCompletionItem(el.label as string))
    }
    return this.completionArr.filter(({ label }) => !this.prevAccept[label as string])
  }
  protected getCompletionItem(label: string): CompletionItem {
    const compleItem = new vscode.CompletionItem(label)
    compleItem.kind = vscode.CompletionItemKind.Function
    compleItem.documentation = `winged子视图${label}`
    if (this.triggerType === 'afterColon') {
      compleItem.insertText = new vscode.SnippetString(label)
    } else if (this.triggerType === 'default') {
      compleItem.insertText = new vscode.SnippetString(`${utils.pascalToCamel(label)}:${label}`)
    }
    return compleItem
  }
}