"use client"

import { useMemo, useState, type ReactNode } from "react"
import type { ServerStatus, ServerType } from "@/lib/data"
import { Flag } from "@/components/flag"
import { StatusDot } from "@/components/status-dot"
import { Badge } from "@/components/reui/badge"
import { IconTile } from "@/components/reui/icon-tile"
import {
  Frame,
  FrameHeader,
  FramePanel,
  FrameTitle,
} from "@/components/reui/frame"
import { ScrollArea } from "@/components/ui/scroll-area"
import {
  InputGroup,
  InputGroupAddon,
  InputGroupInput,
} from "@/components/ui/input-group"
import { cn } from "@/lib/utils"
import { LayersIcon, SearchIcon, ServerIcon } from "lucide-react"

/** Preview: https://reui.io/preview/base/list-9 · https://reui.io/docs/components/base/icon-tile · https://reui.io/preview/base/components/c-input-group-1 */
export const ALL_SERVERS_ID = "all"

export interface ServerTileItem {
  id: string
  name: string
  country?: string
  status?: ServerStatus
  type?: ServerType
  count?: number
  enabled?: boolean
  selectable?: boolean
  title?: string
}

function typeBadgeVariant(
  type: ServerType,
): "focus-light" | "info-light" | "success-light" {
  if (type === "jump-host") return "focus-light"
  if (type === "home-router") return "success-light"
  return "info-light"
}

function typeBadgeLabel(type: ServerType): string {
  if (type === "jump-host") return "JH"
  if (type === "home-router") return "HR"
  return "EN"
}

function ServerTypeBadge({ type }: { type: ServerType }) {
  return (
    <Badge variant={typeBadgeVariant(type)} size="xs" className="font-mono">
      {typeBadgeLabel(type)}
    </Badge>
  )
}

function matchesQuery(item: ServerTileItem, q: string): boolean {
  if (!q) return true
  const hay = [item.name, item.title ?? ""].join(" ").toLowerCase()
  return hay.includes(q)
}

function ServerTileRail({
  items,
  selectedId,
  onSelect,
  allCount = 0,
  showHeader = true,
  showAll = true,
  showCount = true,
  showType = true,
  headerRight,
  className,
}: {
  items: ServerTileItem[]
  selectedId: string
  onSelect: (id: string) => void
  allCount?: number
  showHeader?: boolean
  showAll?: boolean
  showCount?: boolean
  showType?: boolean
  headerRight?: ReactNode
  className?: string
}) {
  const [query, setQuery] = useState("")
  const q = query.trim().toLowerCase()

  const filtered = useMemo(
    () => items.filter((item) => matchesQuery(item, q)),
    [items, q],
  )

  const showAllTile = showAll && !q

  return (
    <Frame dense spacing="sm" className={cn("flex h-full min-h-0 w-full flex-col", className)}>
      <FramePanel className="flex min-h-0 flex-1 flex-col gap-0 p-0">
        <FrameHeader className="flex flex-col gap-2 border-b px-3 py-2">
          {showHeader ? (
            <div className="flex items-center justify-between gap-2">
              <FrameTitle className="text-xs font-medium uppercase tracking-wide text-muted-foreground">
                Серверы
              </FrameTitle>
              {headerRight}
            </div>
          ) : headerRight ? (
            <div className="flex justify-end">{headerRight}</div>
          ) : null}
          <InputGroup>
            <InputGroupAddon>
              <SearchIcon className="size-3.5" />
            </InputGroupAddon>
            <InputGroupInput
              value={query}
              onChange={(e) => setQuery(e.target.value)}
              placeholder="Поиск…"
              aria-label="Поиск сервера"
            />
          </InputGroup>
        </FrameHeader>
        <ScrollArea className="min-h-0 flex-1">
          <div className="flex flex-col gap-0.5 p-1.5" role="listbox" aria-label="Серверы">
            {showAllTile ? (
              <ServerTileButton
                selected={selectedId === ALL_SERVERS_ID}
                onSelect={() => onSelect(ALL_SERVERS_ID)}
                title="Все серверы"
                name="Все"
                count={showCount ? allCount : undefined}
                icon={
                  <IconTile variant="elevated" size="sm" aria-hidden="true">
                    <LayersIcon className="text-muted-foreground" />
                  </IconTile>
                }
              />
            ) : null}
            {filtered.map((item) => (
              <ServerTileButton
                key={item.id}
                selected={selectedId === item.id}
                onSelect={() => onSelect(item.id)}
                title={item.title ?? item.name}
                name={item.name}
                count={showCount ? item.count : undefined}
                enabled={item.enabled}
                selectable={item.selectable}
                status={item.status}
                type={showType ? item.type : undefined}
                icon={
                  <IconTile variant="elevated" size="sm" aria-hidden="true">
                    {item.country ? (
                      <Flag code={item.country} size={16} />
                    ) : (
                      <ServerIcon className="text-muted-foreground" />
                    )}
                  </IconTile>
                }
              />
            ))}
            {filtered.length === 0 && !showAllTile ? (
              <p className="px-2 py-3 text-center text-xs text-muted-foreground">
                {items.length === 0 ? "Нет доступных серверов" : "Ничего не найдено"}
              </p>
            ) : null}
          </div>
        </ScrollArea>
      </FramePanel>
    </Frame>
  )
}

function ServerTileButton({
  selected,
  onSelect,
  title,
  name,
  count,
  enabled = true,
  selectable = true,
  status,
  type,
  icon,
}: {
  selected: boolean
  onSelect: () => void
  title: string
  name: string
  count?: number
  enabled?: boolean
  selectable?: boolean
  status?: ServerStatus
  type?: ServerType
  icon: ReactNode
}) {
  return (
    <button
      type="button"
      role="option"
      aria-selected={selected}
      title={title}
      disabled={!selectable}
      onClick={onSelect}
      className={cn(
        "flex h-11 w-full items-center gap-2 rounded-md px-2 text-left transition-colors",
        selected
          ? "bg-muted ring-1 ring-border"
          : "hover:bg-muted/60",
        !enabled && !selected && "opacity-40",
        !selectable && "cursor-not-allowed opacity-40 hover:bg-transparent",
      )}
    >
      {icon}
      <span className="flex min-w-0 flex-1 items-center gap-1.5">
        {status ? <StatusDot status={status} /> : null}
        <span className="min-w-0 truncate font-mono text-[11px] font-medium">{name}</span>
        {type ? <ServerTypeBadge type={type} /> : null}
      </span>
      {count != null ? (
        <Badge
          variant={selected ? "secondary" : "outline"}
          size="xs"
          className="tabular-nums"
        >
          {count}
        </Badge>
      ) : null}
    </button>
  )
}

export { ServerTileRail, ServerTypeBadge }