import { useState, type FormEvent } from 'react'
import { api, type Channel, type Key, type Stats } from '../api'
import { channelName, num, type Action } from '../common'
import { formatTime, keyExpiry } from '../time'
import { IconPlus } from '../components/icons'
import { Badge, Dialog, Feedback, Table } from '../components/ui'

interface KeyForm {
  name: string
  all_channels: boolean
  channels: string[]
  expires_at: string
}

const EMPTY_FORM: KeyForm = { name: '', all_channels: false, channels: [], expires_at: '' }

interface KeysProps {
  keys: Key[]
  stats: Stats | null
  channels: Channel[]
  timezone: string
  busy: boolean
  error: string
  notice: string
  action: Action
  refresh: () => void
  notify: (msg: string) => void
  clearError: () => void
  /** 跳转到概览页并按该 Key 筛选统计。 */
  onViewStats: (k: Key) => void
}

export function KeysPage({ keys, stats, channels, timezone, busy, error, notice, action, refresh, notify, clearError, onViewStats }: KeysProps) {
  const [creating, setCreating] = useState(false)
  const [keyForm, setKeyForm] = useState<KeyForm>(EMPTY_FORM)
  const [newKey, setNewKey] = useState('')

  const time = formatTime

  function openCreate() {
    setCreating(true)
    setKeyForm(EMPTY_FORM)
  }

  function closeCreate() {
    setCreating(false)
    clearError()
  }

  function submit(e: FormEvent) {
    e.preventDefault()
    action(async () => {
      if (!keyForm.all_channels && !keyForm.channels.length) throw new Error('请选择至少一个渠道，或授权全部渠道。')
      const expires_at = keyExpiry(keyForm.expires_at)
      const r = await api<{ key: string }>('/keys', 'POST', { ...keyForm, channels: keyForm.all_channels ? [] : keyForm.channels, expires_at })
      setNewKey(r.key)
      setCreating(false)
      refresh()
    })
  }

  function toggle(k: Key) {
    action(async () => {
      await api('/keys/' + encodeURIComponent(k.id), 'PATCH', { enabled: !k.enabled })
      refresh()
    })
  }

  function revoke(k: Key) {
    if (!confirm(`确定撤销 Key“${k.name}”？历史记录将保留。`)) return
    action(async () => {
      await api('/keys/' + encodeURIComponent(k.id), 'DELETE')
      refresh()
      notify('Key 已撤销，历史记录已保留。')
    })
  }

  function copyKey() {
    action(async () => {
      if (!navigator.clipboard) throw new Error('无法自动复制，请选中密钥手动复制。')
      await navigator.clipboard.writeText(newKey)
      notify('密钥已复制。')
    })
  }

  function toggleChannel(id: string, checked: boolean) {
    setKeyForm({
      ...keyForm,
      channels: checked ? [...keyForm.channels, id] : keyForm.channels.filter(c => c !== id),
    })
  }

  return (
    <section className="panel">
      <div className="section-head">
        <h2>访问密钥 <small>{keys.length}</small></h2>
        <button className="primary" onClick={openCreate}><IconPlus />创建 Key</button>
      </div>
      <Table
        heads={['名称 / 前缀', '渠道权限', '状态', '请求 / tokens', '有效期 / 创建时间', '操作']}
        rows={keys.map(k => {
          const u = stats?.by_key?.find(u => u.key_id === k.id)
          return [
            <><button className="link" onClick={() => onViewStats(k)}>{k.name}</button><code className="sub">{k.prefix}…</code></>,
            k.all_channels ? '全部渠道' : k.channels?.map(id => channelName(channels, id)).join('、') || '无渠道权限',
            <Badge variant={k.revoked ? 'danger' : k.enabled ? 'good' : 'neutral'}>{k.revoked ? '已撤销' : k.enabled ? '启用' : '停用'}</Badge>,
            <>{num(u?.requests ?? 0)} 次<small className="sub">输入 {num(u?.input_tokens ?? 0)} / 输出 {num(u?.output_tokens ?? 0)}</small></>,
            <>{time(k.expires_at) === '—' ? '永不过期' : time(k.expires_at)}<small className="sub">创建于 {time(k.created_at)}</small></>,
            <div className="actions">
              <button disabled={busy || k.revoked} onClick={() => toggle(k)}>{k.enabled ? '停用' : '启用'}</button>
              <button className="danger" disabled={busy} onClick={() => revoke(k)}>撤销</button>
            </div>,
          ]
        })}
      />
      {creating && (
        <Dialog id="key-title" title="创建访问密钥" onClose={closeCreate}>
          <Feedback error={error} notice={notice} />
          <form onSubmit={submit}>
            <fieldset disabled={busy}>
              <label>名称
                <input autoFocus required value={keyForm.name} onChange={e => setKeyForm({ ...keyForm, name: e.target.value })} />
              </label>
              <label>有效期（{timezone}，可选）
                <input type="datetime-local" value={keyForm.expires_at} onChange={e => setKeyForm({ ...keyForm, expires_at: e.target.value })} />
                <small>留空表示永不过期。</small>
              </label>
              <label className="check">
                <input type="checkbox" checked={keyForm.all_channels} onChange={e => setKeyForm({ ...keyForm, all_channels: e.target.checked })} />允许全部渠道（包含未来新增渠道）
              </label>
              {!keyForm.all_channels && (
                <div className="channel-options">
                  <p>选择允许访问的渠道</p>
                  {!channels.length && <p className="muted">暂无渠道，请先创建渠道。</p>}
                  {channels.map(c => (
                    <label className="check" key={c.id}>
                      <input type="checkbox" checked={keyForm.channels.includes(c.id)} onChange={e => toggleChannel(c.id, e.target.checked)} />
                      {c.name}{!c.enabled && '（停用）'}
                    </label>
                  ))}
                </div>
              )}
              <div className="dialog-actions">
                <button type="button" onClick={closeCreate}>取消</button>
                <button className="primary">{busy ? '创建中…' : '创建 Key'}</button>
              </div>
            </fieldset>
          </form>
        </Dialog>
      )}
      {newKey && (
        <Dialog id="secret-title" title="Key 已创建">
          <div className="alert warning">完整密钥仅展示这一次。请立即复制并妥善保存，关闭后无法再次查看。</div>
          <label>完整密钥
            <textarea autoFocus readOnly rows={3} value={newKey} onFocus={e => e.target.select()} />
          </label>
          <Feedback error={error} notice={notice} />
          <div className="dialog-actions">
            <button onClick={() => { setNewKey(''); notify('') }}>我已保存，关闭</button>
            <button className="primary" onClick={copyKey}>复制密钥</button>
          </div>
        </Dialog>
      )}
    </section>
  )
}