import React from 'react';

import Navigation from '../lib/navigation.js';

const navigate = view => Navigation.navigateTo(view);

const VIEW_CONFIG = {
  'chat-inbound-request': {relationship: 'pending_inbound', variant: 'inbound-request'},
  'chat-inbound-message': {relationship: 'pending_inbound', variant: 'inbound-message'},
  'chat-outbound-request': {relationship: 'pending_outbound', variant: 'outbound-request'},
  'chat-status': {relationship: 'friend', variant: 'status'},
  'chat-friend': {relationship: 'friend', variant: 'friend'},
  'chat-media': {relationship: 'friend', variant: 'media'},
  'chat-blocked': {relationship: 'blocked_by_peer', variant: 'blocked'},
  'chat-deleted': {relationship: 'none', variant: 'deleted'},
  'chat-standard': {relationship: 'friend', variant: 'standard'},
  'chat-attachments': {relationship: 'friend', variant: 'attachments'},
  'chat-mixed': {relationship: 'friend', variant: 'mixed'},
  'chat-contact-card': {relationship: 'friend', variant: 'contact-card'}
};

const ATTACHMENTS = [
  {id: 'photo', icon: 'image', label: '照片'},
  {id: 'camera', icon: 'photo_camera', label: '拍摄'},
  {id: 'call', icon: 'call', label: '视频语音'},
  {id: 'card', icon: 'contact_page', label: '名片'},
  {id: 'file', icon: 'folder', label: '文件'},
  {id: 'favorite', icon: 'bookmark', label: '收藏'},
  {id: 'video', icon: 'videocam', label: '视频通话'}
];

function Icon({children}) {
  return <i className="material-icons" aria-hidden="true">{children}</i>;
}

function Toast({message, onDone}) {
  React.useEffect(() => {
    if (!message) return undefined;
    const timer = window.setTimeout(onDone, 2200);
    return () => window.clearTimeout(timer);
  }, [message, onDone]);
  return message ? <div className="chat-toast" role="status">{message}</div> : null;
}

function ChatAvatar({mine = false, peer = false}) {
  return <div className="chat-avatar"><img src={mine ? 'img/bkg/p05.jpg' : peer ? 'img/bkg/p09.jpg' : 'img/bkg/p14.jpg'} alt="" /></div>;
}

function Status({value, failedReason}) {
  if (!value && !failedReason) return null;
  return <div className={'chat-message-status' + (failedReason ? ' failed' : '')}>
    {failedReason ? <Icon>error</Icon> : null}<span>{failedReason || value}</span>
  </div>;
}

function FileCard() {
  return <div className="chat-file-card">
    <div><strong>365天艾宾浩斯记忆曲线复习计划.pdf</strong><small>115KB</small></div>
    <span className="chat-file-icon">P</span>
  </div>;
}

function ContactCard({onOpen}) {
  return <button type="button" className="chat-contact-card" onClick={onOpen}>
    <span><img src="img/bkg/p15.jpg" alt="" /><strong>栗子来了</strong></span>
    <small>个人名片 · 账号 QL1024</small>
  </button>;
}

function VoiceMessage({duration = 6, playing = false}) {
  return <div className="chat-voice-message"><Icon>{playing ? 'graphic_eq' : 'volume_up'}</Icon><strong>{duration}″</strong><span /></div>;
}

function ImageMessage({progress}) {
  return <div className="chat-image-message">
    <img src="img/bkg/p22.jpg" alt="会话图片" />
    {progress < 100 ? <div className="chat-upload-progress"><progress value={progress} max="100" /><strong>{progress}%</strong></div> : null}
  </div>;
}

function Bubble({mine = false, children, status, failedReason, type = 'text', onOpenCard}) {
  return <div className={'chat-message-row' + (mine ? ' mine' : '')}>
    {!mine ? <ChatAvatar peer /> : null}
    <div className="chat-message-stack">
      {type === 'file' ? <FileCard /> : type === 'card' ? <ContactCard onOpen={onOpenCard} /> :
        <div className={'chat-bubble ' + type + (mine ? ' mine' : '')}>{children}</div>}
      <Status value={status} failedReason={failedReason} />
    </div>
    {mine ? <ChatAvatar mine /> : null}
  </div>;
}

function RelationNotice({children, action, onAction}) {
  return <div className="chat-relation-notice"><span>{children}</span>{action ? <button type="button" onClick={onAction}>{action}</button> : null}</div>;
}

function ChatTimeline({variant, uploadProgress, sendStatus, onRetry, onOpenCard, onFriendAction}) {
  if (variant === 'inbound-request' || variant === 'inbound-message') {
    return <>
      <p className="chat-time">7月30日 11:40</p>
      <Bubble>{variant === 'inbound-request' ? '请求添加你为好友' : '我是祈万事安好'}</Bubble>
      <RelationNotice>以上是打招呼的消息</RelationNotice>
      <div className="chat-request-actions"><button type="button" onClick={() => onFriendAction('declined')}>拒绝</button><button type="button" className="primary" onClick={() => onFriendAction('accepted')}>通过申请</button></div>
    </>;
  }

  if (variant === 'outbound-request') {
    return <>
      <p className="chat-time">7月30日 11:40</p>
      <Bubble mine status="已发送">请求添加你为好友</Bubble>
      <RelationNotice>好友申请已发送，等待对方处理</RelationNotice>
    </>;
  }

  if (variant === 'status') {
    return <>
      <p className="chat-time">7月30日 11:40</p>
      <Bubble mine status={sendStatus}>我是祈万事安好</Bubble>
      <RelationNotice>你已添加安妮，现在可以开始聊天。</RelationNotice>
    </>;
  }

  if (variant === 'friend') {
    return <>
      <p className="chat-time">8月27日 11:11</p>
      <RelationNotice>你们已成为好友，现在可以开始聊天</RelationNotice>
      <Bubble>我们已成为好友，现在我们可以开始聊天</Bubble>
      <Bubble mine status="已读">你还好吗？</Bubble>
    </>;
  }

  if (variant === 'media') {
    return <>
      <p className="chat-time">8月27日 11:11</p>
      <RelationNotice>接雨彤创建群聊</RelationNotice>
      <Bubble mine status="已读">你还好吗？</Bubble>
      <Bubble mine type="image"><ImageMessage progress={uploadProgress} /></Bubble>
      <Bubble mine type="voice"><VoiceMessage duration={6} playing /></Bubble>
      <Bubble type="voice"><VoiceMessage duration={6} /></Bubble>
    </>;
  }

  if (variant === 'blocked') {
    return <>
      <p className="chat-time">7月30日 11:40</p>
      <Bubble mine status="已读">请求添加你为好友</Bubble>
      <RelationNotice>你已添加了安妮，现在可以开始聊天。</RelationNotice>
      <p className="chat-time">7月30日 13:00</p>
      <Bubble mine status="已读">这边在网上看见你的留言，你想了解什么课程了</Bubble>
      <Bubble>有课程辅导的老师？对新手友好吗？</Bubble>
      <Bubble mine failedReason="消息已发送，但被对方拒收了">这个不用担心特别好上手，学起来特别简单</Bubble>
      <Bubble mine failedReason="消息已发送，但被对方拒收了">拉黑我这么速度，真的牛</Bubble>
    </>;
  }

  if (variant === 'deleted') {
    return <>
      <p className="chat-time">7月30日 13:00</p>
      <Bubble mine status="已读">你好我是XXX推荐过来的，这边想了解课程是吗</Bubble>
      <Bubble>这边目前找到更好的课程，不考虑你们家，谢谢</Bubble>
      <Bubble mine status="已读">这是我们导师名片，你可以加一下，对比一下价格</Bubble>
      <RelationNotice action="发送朋友验证" onAction={() => onFriendAction('resent')}>你还不是他（她）朋友。</RelationNotice>
      <Bubble mine failedReason="发送失败，需重新添加好友">这么突然把我删了，真心累了</Bubble>
      <RelationNotice action="发送朋友验证" onAction={() => onFriendAction('resent')}>你还不是他（她）朋友。</RelationNotice>
    </>;
  }

  const base = <>
    <p className="chat-time">7月30日 11:40</p>
    <Bubble mine status="已读">请求添加你为好友</Bubble>
    <RelationNotice>你已添加了安妮，现在可以开始聊天。</RelationNotice>
    <p className="chat-time">7月30日 13:00</p>
    <Bubble mine status="已读">你好，我是王珊珊，很高兴认识你，你怎么称呼</Bubble>
    <Bubble>你好，我是安妮，想跟你咨询一下设计课程，方便？</Bubble>
  </>;

  if (variant === 'standard') {
    return <>{base}<Bubble mine status="未读">非常方便，这是我们的课程目录，你可以看看了解一下</Bubble><Bubble mine type="file" status="未读" /></>;
  }
  if (variant === 'mixed') {
    return <>{base}<Bubble mine type="file" status="已送达" /><Bubble type="card" onOpenCard={onOpenCard} /></>;
  }
  if (variant === 'contact-card') {
    return <>{base}<Bubble mine status="已读">这是我们导师名片，你可以加一下，有问题随时联系他</Bubble><Bubble mine type="card" status="已送达" onOpenCard={onOpenCard} /><Bubble>好的，非常感谢，那我这边就直接联系他吧</Bubble><Bubble mine status="已读">没问题的，有疑问随时沟通</Bubble></>;
  }
  return base;
}

function AttachmentPanel({onChoose}) {
  return <div className="chat-attachment-panel">
    {ATTACHMENTS.map(item => <button type="button" key={item.id} onClick={() => onChoose(item)}><span><Icon>{item.icon}</Icon></span><small>{item.label}</small></button>)}
  </div>;
}

function Composer({relationship, attachmentOpen, setAttachmentOpen, onSend}) {
  const [draft, setDraft] = React.useState(sessionStorage.getItem('im-chat-draft') || '');
  const canSend = relationship === 'friend';
  const updateDraft = value => {
    setDraft(value);
    sessionStorage.setItem('im-chat-draft', value);
  };
  const submit = e => {
    e.preventDefault();
    if (!canSend || !draft.trim()) return;
    onSend(draft.trim());
    updateDraft('');
  };
  return <form className={'chat-composer' + (!canSend ? ' locked' : '')} onSubmit={submit}>
    <button type="button" aria-label="语音" disabled={!canSend} onClick={() => navigate('voice-ready')}><Icon>record_voice_over</Icon></button>
    <input value={draft} onChange={e => updateDraft(e.target.value)} placeholder={canSend ? '输入消息' : relationship === 'pending_inbound' ? '请先处理好友申请' : relationship === 'pending_outbound' ? '等待对方通过好友申请' : '当前无法发送消息'} disabled={!canSend} />
    <button type="button" aria-label="表情" disabled={!canSend} onClick={() => navigate('emoji-panel')}><Icon>sentiment_satisfied_alt</Icon></button>
    {draft.trim() ? <button type="submit" className="chat-send-button">发送</button> : <button type="button" aria-label="更多" disabled={!canSend} onClick={() => setAttachmentOpen(!attachmentOpen)}><Icon>{attachmentOpen ? 'keyboard' : 'add_circle_outline'}</Icon></button>}
  </form>;
}

export default function DirectMessageView({view}) {
  const config = VIEW_CONFIG[view] || VIEW_CONFIG['chat-standard'];
  const [relationship, setRelationship] = React.useState(config.relationship);
  const [variant, setVariant] = React.useState(config.variant);
  const [attachmentOpen, setAttachmentOpen] = React.useState(config.variant === 'attachments');
  const [uploadProgress, setUploadProgress] = React.useState(config.variant === 'media' ? 76 : 100);
  const [sendStatus, setSendStatus] = React.useState('发送中');
  const [extraMessages, setExtraMessages] = React.useState([]);
  const [toast, setToast] = React.useState('');

  React.useEffect(() => {
    if (variant !== 'status') return undefined;
    const stages = ['已发送', '已送达', '已读'];
    const timers = stages.map((status, index) => window.setTimeout(() => setSendStatus(status), 600 * (index + 1)));
    return () => timers.forEach(timer => window.clearTimeout(timer));
  }, [variant]);

  React.useEffect(() => {
    if (variant !== 'media' || uploadProgress >= 100) return undefined;
    const timer = window.setTimeout(() => setUploadProgress(value => Math.min(value + 4, 100)), 350);
    return () => window.clearTimeout(timer);
  }, [variant, uploadProgress]);

  const friendAction = action => {
    if (action === 'declined') {
      setRelationship('none');
      setToast('已拒绝好友申请');
    } else {
      setRelationship(action === 'accepted' ? 'friend' : 'pending_outbound');
      if (action === 'accepted') setVariant('friend');
      setToast(action === 'accepted' ? '好友申请已通过' : '好友验证已发送');
    }
  };

  return <div className="chat-product-page">
    <header className="chat-product-header">
      <button type="button" onClick={() => navigate('messages-home')} aria-label="返回消息"><Icon>arrow_back_ios_new</Icon></button>
      <div><h1>接语彤</h1><span><i />在线</span></div>
      <button type="button" onClick={() => navigate('friend-settings')} aria-label="会话设置"><Icon>more_vert</Icon></button>
    </header>
    <main className="chat-product-timeline">
      <ChatTimeline variant={variant} uploadProgress={uploadProgress} sendStatus={sendStatus}
        onRetry={() => setToast('正在重试发送')} onOpenCard={() => navigate('friend-profile')} onFriendAction={friendAction} />
      {extraMessages.map(item => <Bubble mine status={item.status} key={item.id}>{item.text}</Bubble>)}
    </main>
    {relationship === 'friend' ? null : <div className="chat-permission-banner"><Icon>info_outline</Icon>{relationship === 'pending_inbound' ? '通过好友申请后即可发送消息' : relationship === 'pending_outbound' ? '好友申请正在等待处理' : relationship === 'none' ? '对方已不是你的好友，发送消息前需重新验证' : '当前关系状态下无法发送消息'}</div>}
    <Composer relationship={relationship} attachmentOpen={attachmentOpen} setAttachmentOpen={setAttachmentOpen}
      onSend={text => {
        const id = Date.now();
        setExtraMessages(items => items.concat({id, text, status: '发送中'}));
        window.setTimeout(() => setExtraMessages(items => items.map(item => item.id === id ? {...item, status: '已发送'} : item)), 600);
      }} />
    {attachmentOpen && relationship === 'friend' ? <AttachmentPanel onChoose={item => {
      setToast(`已选择${item.label}，上传接口将在联调阶段接入`);
      if (item.id === 'card') navigate('chat-contact-card');
      if (item.id === 'photo' || item.id === 'camera') navigate('media-uploading');
      if (item.id === 'call' || item.id === 'video') navigate('call-history');
      if (item.id === 'file') navigate('upload-file');
      if (item.id === 'favorite') navigate('favorites');
    }} /> : null}
    <Toast message={toast} onDone={() => setToast('')} />
  </div>;
}