/**
 * 调用树弹框：盖在编辑区上，预览的卡片留在后面。点遮罩、点叉、按 Esc 关掉，焦点回到打开它的按钮。
 * 点树上的一行跳到它在的文件和行。接口在契约文件里没对上时写明原因，不当成没人调用。
 */

import type { ReactElement } from 'react'
import type { CallJump, CallTree, CallTreeNode, ContractMiss, KindBadge } from './types'
import { Box, Braces, Send, X } from 'lucide-react'
import { useEffect, useState } from 'react'
import { createPortal } from 'react-dom'
import { kindProps } from './BlockTree'

export function CallTreeDialog({ kind, badge, name, where, status, trees, contractMiss, onClose, onJump }: {
  /** 当前块的种类，整条路径用这个种类色；库规则的卡片按 badge 的颜色 */
  kind: string
  badge?: KindBadge
  name: string
  where: string
  status: 'loading' | 'empty' | 'ready'
  trees: readonly CallTree[]
  /** 接口在契约文件里没对上时有 */
  contractMiss?: ContractMiss
  onClose: () => void
  /** 点了树上的一行 */
  onJump: (jump: CallJump) => void
}): ReactElement {
  const [selected, setSelected] = useState(0)
  const tree = trees[Math.min(selected, Math.max(trees.length - 1, 0))]

  useEffect(() => {
    const onKey = (event: KeyboardEvent) => {
      if (event.key !== 'Escape')
        return
      document.querySelector<HTMLButtonElement>('[data-call-tree][data-active]')?.focus()
      onClose()
    }
    window.addEventListener('keydown', onKey)
    return () => window.removeEventListener('keydown', onKey)
  }, [onClose])

  function close(): void {
    document.querySelector<HTMLButtonElement>('[data-call-tree][data-active]')?.focus()
    onClose()
  }

  return createPortal(
    <div
      className="cr-call-overlay"
      onClick={(event) => {
        if (event.target === event.currentTarget)
          close()
      }}
    >
      <div
        role="dialog"
        aria-modal="true"
        aria-label={name ? `调用树 ${name}` : '调用树'}
        className="cr-call-dialog"
        {...kindProps({ kind, badge })}
      >
        <div className="cr-call-title">
          <span className="cr-call-heading">调用树</span>
          {name && <span className="cr-call-symbol">{name}</span>}
          {where && <span className="cr-call-loc">{where}</span>}
          <button type="button" className="cr-tool cr-call-close" aria-label="关闭" onClick={close}>
            <X size={16} strokeWidth={1.8} />
          </button>
        </div>
        {status === 'ready' && trees.length > 1 && (
          <div className="cr-call-entries" role="tablist" aria-label="调用树入口">
            {trees.map((item, index) => (
              <button
                key={item.id}
                type="button"
                role="tab"
                aria-selected={index === selected}
                data-active={index === selected ? '' : undefined}
                className="cr-call-entry"
                onClick={() => setSelected(index)}
              >
                <span>{item.name}</span>
                <span className="cr-call-hits">{`${item.hits} 处`}</span>
              </button>
            ))}
          </div>
        )}
        <div className="cr-call-body">
          {status === 'loading' && <p className="cr-call-note">正在查调用关系</p>}
          {status !== 'loading' && contractMiss && <ContractNote miss={contractMiss} />}
          {status === 'empty' && !contractMiss && <p className="cr-call-note">没有调用它的地方</p>}
          {status === 'ready' && tree && <CallNodes node={tree.root} depth={0} path={tree.id} onJump={onJump} />}
        </div>
      </div>
    </div>,
    document.body,
  )
}

/**
 * 接口在契约文件里没对上：分不出是哪一条时列出那几条；没有这一条时让人重新生成、列出找到的契约文件；
 * 一份契约文件都没有时说没找到。
 */
function ContractNote({ miss }: { miss: ContractMiss }): ReactElement {
  if (miss.files.length === 0)
    return <p className="cr-call-note">工作区里没找到接口契约文件（openapi-typescript 生成的 .d.ts 或 openapi.json）</p>
  const [text, items] = miss.ambiguous
    ? ['接口契约文件里有几条都对得上这个接口，按 operationId 也分不出是哪一条', miss.ambiguous]
    : ['接口契约文件里没有这个接口，重新生成后再看', miss.files]
  return (
    <div className="cr-call-note">
      <p>{text}</p>
      <ul className="cr-call-files">
        {items.map(item => <li key={item} className="cr-call-loc">{item}</li>)}
      </ul>
    </div>
  )
}

const NODE_ICONS: Record<string, typeof Braces> = { class: Box, request: Send }

function CallNodes({ node, depth, path, onJump }: { node: CallTreeNode, depth: number, path: string, onJump: (jump: CallJump) => void }): ReactElement {
  const Icon = NODE_ICONS[node.kind] ?? Braces
  return (
    <>
      <div className="cr-call-row" style={{ paddingLeft: depth * 22 }}>
        <span className="cr-call-guide" />
        <button type="button" className="cr-call-card" data-current={node.current ? '' : undefined} onClick={() => onJump(node.jump)}>
          <span className="cr-call-line">
            <Icon size={14} strokeWidth={1.8} aria-hidden />
            <span className="cr-call-name">{node.name}</span>
            {node.current && <span className="cr-call-pill">当前</span>}
          </span>
          <span className="cr-call-sub">
            {node.detail && <span>{node.detail}</span>}
            <span className="cr-call-loc">{node.where}</span>
          </span>
        </button>
      </div>
      {node.children.map((child, index) => (
        <CallNodes key={`${path}/${index}`} node={child} depth={depth + 1} path={`${path}/${index}`} onJump={onJump} />
      ))}
      {node.otherCalls !== undefined && node.otherCalls > 0 && (
        <div className="cr-call-row" style={{ paddingLeft: (depth + 1) * 22 }}>
          <span className="cr-call-guide" data-folded="" />
          <span className="cr-call-folded">{`另外 ${node.otherCalls} 处调用`}</span>
        </div>
      )}
    </>
  )
}