import type { Torrent, TorrentAction } from './shared';
import {
  ChevronsDown,
  ChevronsUp,
  CircleCheckBig,
  FolderInput,
  Pause,
  Play,
  Plus,
  RefreshCw,
  Search,
  Settings2,
  Rabbit,
  Tag,
  Trash2,
  Turtle,
  X,
} from 'lucide-react';
import { Button } from '@/components/ui/button';
import { Input } from '@/components/ui/input';
import {
  DropdownMenu,
  DropdownMenuContent,
  DropdownMenuItem,
  DropdownMenuSeparator,
  DropdownMenuTrigger,
} from '@/components/ui/dropdown-menu';
import { Tooltip, TooltipContent, TooltipTrigger } from '@/components/ui/tooltip';

// Actions above the list. Everything acts on the current selection except Add and the turtle toggle; with
// nothing selected the selection-scoped buttons are disabled rather than silently acting on all torrents,
// which is the single most destructive mistake a torrent client UI can make.

type TorrentToolbarProps = {
  selected: Torrent[];
  search: string;
  onSearch: (value: string) => void;
  onAct: (action: TorrentAction) => void;
  onAdd: () => void;
  onRemove: () => void;
  onMove: () => void;
  onLabels: () => void;
  onOptions: () => void;
  /** Session alt-speed ("turtle mode"), which is global rather than per-torrent. */
  altSpeed: boolean;
  onToggleAltSpeed: () => void;
  total: number;
  shown: number;
};

export const TorrentToolbar = ({
  selected,
  search,
  onSearch,
  onAct,
  onAdd,
  onRemove,
  onMove,
  onLabels,
  onOptions,
  altSpeed,
  onToggleAltSpeed,
  total,
  shown,
}: TorrentToolbarProps) => {
  const none = selected.length === 0;
  // "Start" and "Pause" are offered by what the selection can actually do, so a paused selection doesn't
  // show a live Pause button that would be a no-op.
  const anyStopped = selected.some((t) => t.status === 0);
  const anyRunning = selected.some((t) => t.status !== 0);

  return (
    <div className="flex shrink-0 flex-wrap items-center gap-1 border-b border-border px-3 py-2">
      <Button size="sm" onClick={onAdd}>
        <Plus className="mr-1.5 h-3.5 w-3.5" />
        Add
      </Button>

      <Separator />

      <IconButton label="Start" icon={Play} disabled={none || !anyStopped} onClick={() => onAct('start')} />
      <IconButton label="Pause" icon={Pause} disabled={none || !anyRunning} onClick={() => onAct('stop')} />
      <IconButton label="Verify local data" icon={CircleCheckBig} disabled={none} onClick={() => onAct('verify')} />
      <IconButton
        label="Ask tracker for more peers"
        icon={RefreshCw}
        disabled={none}
        onClick={() => onAct('reannounce')}
      />

      <Separator />

      <IconButton label="Move up the queue" icon={ChevronsUp} disabled={none} onClick={() => onAct('queue-up')} />
      <IconButton label="Move down the queue" icon={ChevronsDown} disabled={none} onClick={() => onAct('queue-down')} />

      <Separator />

      <IconButton label="Set location" icon={FolderInput} disabled={none} onClick={onMove} />
      <IconButton label="Labels" icon={Tag} disabled={none} onClick={onLabels} />
      <IconButton label="Torrent options" icon={Settings2} disabled={none} onClick={onOptions} />
      <IconButton label="Remove" icon={Trash2} disabled={none} onClick={onRemove} destructive />

      <Separator />

      <DropdownMenu>
        <DropdownMenuTrigger asChild>
          <Button size="sm" variant="ghost" className="text-xs">
            More
          </Button>
        </DropdownMenuTrigger>
        <DropdownMenuContent align="start">
          <DropdownMenuItem disabled={none} onSelect={() => onAct('start-now')}>
            Start now (skip the queue)
          </DropdownMenuItem>
          <DropdownMenuSeparator />
          <DropdownMenuItem disabled={none} onSelect={() => onAct('queue-top')}>
            Move to the top of the queue
          </DropdownMenuItem>
          <DropdownMenuItem disabled={none} onSelect={() => onAct('queue-bottom')}>
            Move to the bottom of the queue
          </DropdownMenuItem>
        </DropdownMenuContent>
      </DropdownMenu>

      <IconButton
        label={altSpeed ? 'Alternative speed limits are on' : 'Turn on alternative speed limits'}
        icon={altSpeed ? Turtle : Rabbit}
        onClick={onToggleAltSpeed}
        active={altSpeed}
      />

      <div className="ml-auto flex items-center gap-2">
        {selected.length > 0 && (
          <span className="text-xs tabular-nums text-muted-foreground">{selected.length} selected</span>
        )}
        <span className="text-xs tabular-nums text-muted-foreground">
          {shown === total ? `${total}` : `${shown} / ${total}`}
        </span>
        <div className="relative">
          <Search className="pointer-events-none absolute left-2 top-1/2 h-3.5 w-3.5 -translate-y-1/2 text-muted-foreground" />
          <Input
            value={search}
            onChange={(ev) => onSearch(ev.target.value)}
            placeholder="Filter by name or label"
            className="h-8 w-56 pl-7 pr-7 text-xs"
          />
          {search && (
            <button
              type="button"
              onClick={() => onSearch('')}
              className="absolute right-2 top-1/2 -translate-y-1/2 text-muted-foreground hover:text-foreground"
              aria-label="Clear filter"
            >
              <X className="h-3.5 w-3.5" />
            </button>
          )}
        </div>
      </div>
    </div>
  );
};

const Separator = () => <span className="mx-1 h-5 w-px bg-border" />;

type IconButtonProps = {
  label: string;
  icon: React.ComponentType<{ className?: string }>;
  onClick: () => void;
  disabled?: boolean;
  destructive?: boolean;
  active?: boolean;
};

const IconButton = ({ label, icon: Icon, onClick, disabled, destructive, active }: IconButtonProps) => (
  <Tooltip>
    <TooltipTrigger asChild>
      <Button
        size="sm"
        variant="ghost"
        disabled={disabled}
        onClick={onClick}
        aria-label={label}
        className={`h-8 w-8 p-0 ${destructive ? 'hover:text-destructive' : ''} ${active ? 'bg-muted text-primary' : ''}`}
      >
        <Icon className="h-4 w-4" />
      </Button>
    </TooltipTrigger>
    <TooltipContent>{label}</TooltipContent>
  </Tooltip>
);