/**
 * Local Shell picker — choose Zsh / Bash (default marked)
 */

import { useEffect, useRef, useState, useCallback } from 'react'
import { Laptop, ChevronDown } from 'lucide-react'
import { useTabStore } from '../../../stores/tabStore'
import { shellDisplayFromPath } from '../../../utils/shellName'
import { fallbackLocalShells } from '../../../utils/platformShells'

export interface ShellOption {
  path: string
  name: string
  kind: string
  isDefault: boolean
}

interface LocalShellMenuProps {
  /** Compact icon-only trigger (sidebar) */
  compact?: boolean
  className?: string
}

export default function LocalShellMenu({ compact = false, className = '' }: LocalShellMenuProps) {
  const { addTab } = useTabStore()
  const [open, setOpen] = useState(false)
  const [shells, setShells] = useState<ShellOption[]>([])
  const rootRef = useRef<HTMLDivElement>(null)

  useEffect(() => {
    const fallback = () => setShells(fallbackLocalShells() as ShellOption[])

    void window.opsxApi?.localListShells?.().then((res) => {
      if (res?.success && res.shells?.length) {
        setShells(res.shells)
      } else {
        fallback()
      }
    }).catch(fallback)
  }, [])

  useEffect(() => {
    if (!open) return
    const onDoc = (e: MouseEvent) => {
      if (rootRef.current && !rootRef.current.contains(e.target as Node)) {
        setOpen(false)
      }
    }
    document.addEventListener('mousedown', onDoc)
    return () => document.removeEventListener('mousedown', onDoc)
  }, [open])

  const openShell = useCallback(
    (opt?: ShellOption) => {
      const chosen =
        opt ||
        shells.find((s) => s.isDefault) ||
        shells[0] || {
          path: '',
          name: 'Local',
          kind: 'unknown',
          isDefault: true,
        }
      const display = shellDisplayFromPath(chosen.path || chosen.name)
      addTab({
        title: display.title,
        type: 'terminal',
        isLocal: true,
        localShellPath: chosen.path || undefined,
        localShellKind: display.kind,
      })
      setOpen(false)
    },
    [addTab, shells]
  )

  const badgeClass = (kind: string) => {
    if (kind === 'zsh') return 'bg-teal-700 text-teal-100'
    if (kind === 'bash') return 'bg-dark-600 text-emerald-300'
    if (kind === 'fish') return 'bg-violet-700 text-violet-100'
    return 'bg-dark-600 text-content-secondary'
  }

  return (
    <div ref={rootRef} className={`relative ${className}`}>
      {compact ? (
        <div className="flex">
          <button
            type="button"
            onClick={() => openShell()}
            title="打开默认本地 Shell"
            className="flex items-center justify-center px-2.5 py-2 bg-dark-700 hover:bg-dark-600 border border-dark-600/60 rounded-l-lg text-sm font-medium transition-colors text-content-primary border-r-0"
          >
            <Laptop className="w-4 h-4" />
          </button>
          <button
            type="button"
            onClick={() => setOpen((v) => !v)}
            title="选择 Shell"
            className="flex items-center justify-center px-1.5 py-2 bg-dark-700 hover:bg-dark-600 border border-dark-600/60 rounded-r-lg text-content-secondary"
          >
            <ChevronDown className="w-3 h-3" />
          </button>
        </div>
      ) : (
        <button
          type="button"
          onClick={() => setOpen((v) => !v)}
          className="w-full flex items-center gap-3 p-4 rounded-2xl border border-dark-700/50 bg-dark-800/70 hover:bg-dark-800 hover:border-accent-blue/40 transition-all text-left"
        >
          <div className="w-11 h-11 rounded-xl bg-accent-blue/15 border border-accent-blue/20 flex items-center justify-center">
            <Laptop className="w-5 h-5 text-accent-blue" />
          </div>
          <div className="flex-1 min-w-0">
            <div className="font-medium text-content-primary">本地 Shell</div>
            <div className="text-xs text-txt-muted mt-0.5">打开本机终端</div>
          </div>
          <ChevronDown className={`w-4 h-4 text-txt-faint transition-transform ${open ? 'rotate-180' : ''}`} />
        </button>
      )}

      {open && (
        <div
          className={`
            absolute z-50 mt-1 py-1.5 rounded-xl border border-dark-600/80 bg-dark-800 shadow-xl
            min-w-[200px]
            ${compact ? 'right-0' : 'left-0 right-0'}
          `}
        >
          <div className="px-3 py-1.5 text-[10px] font-semibold uppercase tracking-wider text-txt-faint">
            本地 Shell
          </div>
          {shells.map((s) => (
            <button
              key={s.path}
              type="button"
              onClick={() => openShell(s)}
              className="w-full flex items-center gap-2.5 px-3 py-2 hover:bg-dark-700/70 transition-colors text-left"
            >
              <span
                className={`w-7 h-7 rounded-lg flex items-center justify-center text-[10px] font-bold flex-shrink-0 ${badgeClass(s.kind)}`}
              >
                {s.kind === 'bash' ? '$' : s.kind === 'zsh' ? 'zsh' : s.kind.slice(0, 2)}
              </span>
              <span className="text-sm text-content-primary flex-1">{s.name}</span>
              {s.isDefault && (
                <span className="text-[10px] px-1.5 py-0.5 rounded-md bg-dark-700 text-txt-muted border border-dark-600">
                  默认
                </span>
              )}
            </button>
          ))}
        </div>
      )}
    </div>
  )
}

/** Programmatic open helper for menu / palette */
// eslint-disable-next-line react-refresh/only-export-components
export function openLocalShellTab(shell?: { path?: string; kind?: string; name?: string }) {
  const { addTab } = useTabStore.getState()
  const display = shellDisplayFromPath(shell?.path || shell?.name)
  addTab({
    title: display.title,
    type: 'terminal',
    isLocal: true,
    localShellPath: shell?.path,
    localShellKind: shell?.kind || display.kind,
  })
}