"use client"

import { useMemo } from "react"
import {
  type ColumnDef,
  getCoreRowModel,
  getSortedRowModel,
  useReactTable,
} from "@tanstack/react-table"
import type { Server } from "@/lib/data"
import { Flag } from "@/components/flag"
import { Sparkline } from "@/components/sparkline"
import { StatusDot } from "@/components/status-dot"
import { cn } from "@/lib/utils"
import { DataGridShell } from "@/components/data-grids/shared/data-grid-shell"
import {
  DATA_GRID_CELL_PAD,
  DATA_GRID_CELL_PAD_FIRST,
  DATA_GRID_CELL_PAD_LAST,
} from "@/components/data-grids/shared/data-grid-layout"
import { DataGridSortHeader } from "@/components/data-grids/shared/data-grid-sort-header"
import { EmptyState } from "@/components/empty-state"
import {
  AlertCircleIcon,
  ClockIcon,
  CpuIcon,
  HardDriveIcon,
  ServerIcon,
  SearchIcon,
  ThermometerIcon,
} from "lucide-react"

export interface UptimeResourceRow {
  serverId: string
  server: Server
  hasData: boolean
  cpu: number
  cpuHistory: number[]
  ramUsed: number
  ramTotal: number
  ramPct: number
  hddUsed: number
  hddTotal: number
  hddPct: number
  uptimeSeconds: number
  boardName: string
  temp?: number
}

function TypeChip({ type }: { type: "jump-host" | "exit-node" | "home-router" }) {
  return (
    <span className={cn(
      "inline-flex items-center rounded px-1.5 py-0.5 text-[10px] font-bold border shrink-0",
      type === "home-router"
        ? "bg-emerald-500/10 text-emerald-600 dark:text-emerald-400 border-emerald-500/20"
        : type === "jump-host"
          ? "bg-violet-500/10 text-violet-600 dark:text-violet-400 border-violet-500/20"
          : "bg-sky-500/10 text-sky-600 dark:text-sky-400 border-sky-500/20",
    )}>
      {type === "jump-host" ? "JH" : type === "home-router" ? "HR" : "EN"}
    </span>
  )
}

function fmtMB(mb: number): string {
  if (mb >= 1024) return `${(mb / 1024).toFixed(mb >= 10240 ? 0 : 1)} ГБ`
  return `${mb.toFixed(1)} МБ`
}

function fmtUptime(sec: number): string {
  const d = Math.floor(sec / 86400)
  const h = Math.floor((sec % 86400) / 3600)
  const m = Math.floor((sec % 3600) / 60)
  if (d > 0) return `${d}д ${h}ч`
  if (h > 0) return `${h}ч ${m}м`
  return `${m}м`
}

function resPctColor(pct: number, warn = 70, crit = 85): string {
  if (pct >= crit) return "text-red-600 dark:text-red-400"
  if (pct >= warn) return "text-amber-600 dark:text-amber-400"
  return "text-emerald-600 dark:text-emerald-400"
}

function resBarColor(pct: number, warn = 70, crit = 85): string {
  if (pct >= crit) return "bg-red-500"
  if (pct >= warn) return "bg-amber-500"
  return "bg-emerald-500"
}

function MiniBar({
  pct,
  warn = 70,
  crit = 85,
  className,
}: {
  pct: number
  warn?: number
  crit?: number
  className?: string
}) {
  return (
    <div className={cn("h-1.5 rounded-full bg-muted overflow-hidden", className)}>
      <div
        className={cn("h-full rounded-full transition-all duration-700", resBarColor(pct, warn, crit))}
        style={{ width: `${Math.min(100, Math.max(0, pct))}%` }}
      />
    </div>
  )
}

interface UptimeResourcesDataGridProps {
  rows: UptimeResourceRow[]
}

function UptimeResourcesDataGrid({ rows }: UptimeResourcesDataGridProps) {
  const columns = useMemo<ColumnDef<UptimeResourceRow>[]>(
    () => [
      {
        id: "name",
        accessorFn: (row) => row.server.name,
        header: ({ column }) => (
          <DataGridSortHeader column={column} title="Сервер" className="ml-1" />
        ),
        cell: ({ row }) => {
          const r = row.original
          const srv = r.server
          const offline = srv.status !== "online"
          const noMetrics = offline || !r.hasData
          const isCrit =
            !noMetrics &&
            (r.cpu >= 85 || r.ramPct >= 85 || r.hddPct >= 85 || (r.temp ?? 0) >= 70)
          return (
            <div className="flex items-center gap-2 flex-wrap">
              {isCrit && <AlertCircleIcon className="size-3.5 text-red-500 shrink-0" />}
              {!isCrit && <StatusDot status={srv.status} pulse={!offline} />}
              <Flag code={srv.country} size={16} />
              <span className="font-mono font-semibold">{srv.name}</span>
              <TypeChip type={srv.type} />
              <span className="text-xs text-muted-foreground hidden xl:inline">{srv.site}</span>
              {!offline && !r.hasData && (
                <span className="text-[10px] rounded border border-amber-500/30 bg-amber-500/10 text-amber-700 dark:text-amber-400 px-1.5 py-0.5">
                  нет данных
                </span>
              )}
            </div>
          )
        },
        meta: {
          headerTitle: "Сервер",
          headerClassName: DATA_GRID_CELL_PAD_FIRST,
          cellClassName: DATA_GRID_CELL_PAD_FIRST,
        },
      },
      {
        id: "board",
        accessorKey: "boardName",
        header: () => (
          <span className="text-xs font-medium text-muted-foreground hidden md:inline">
            Модель · ROS
          </span>
        ),
        enableSorting: false,
        cell: ({ row }) => {
          const r = row.original
          return (
            <div className="hidden md:flex flex-col leading-tight">
              <span className="font-mono text-xs text-muted-foreground">
                {r.hasData ? r.boardName : "—"}
              </span>
              <span className="text-[10px] text-muted-foreground/50">{r.server.os}</span>
            </div>
          )
        },
        meta: { headerClassName: "hidden md:table-cell", cellClassName: "hidden md:table-cell px-4 py-3" },
      },
      {
        id: "cpu",
        accessorKey: "cpu",
        header: ({ column }) => (
          <span className="inline-flex items-center gap-1.5">
            <CpuIcon className="size-3.5 text-muted-foreground" />
            <DataGridSortHeader column={column} title="CPU" />
          </span>
        ),
        cell: ({ row }) => {
          const r = row.original
          const offline = r.server.status !== "online"
          const noMetrics = offline || !r.hasData
          if (noMetrics) {
            return (
              <span className="text-xs text-muted-foreground/30">
                {offline ? "—" : "нет опроса"}
              </span>
            )
          }
          const cpuColor =
            r.cpu >= 85 ? "hsl(0 84% 60%)" : r.cpu >= 70 ? "hsl(38 92% 50%)" : "hsl(142 76% 36%)"
          return (
            <div className="flex flex-col gap-1.5 min-w-[140px]">
              <div className="flex items-center gap-2">
                <span className={cn("font-mono text-sm font-semibold tabular-nums w-10 shrink-0", resPctColor(r.cpu))}>
                  {r.cpu}%
                </span>
                <MiniBar pct={r.cpu} className="flex-1" />
              </div>
              <Sparkline data={r.cpuHistory} width={120} height={18} color={cpuColor} filled />
            </div>
          )
        },
        meta: {
          headerTitle: "CPU",
          headerClassName: cn(DATA_GRID_CELL_PAD, "min-w-[160px]"),
          cellClassName: cn(DATA_GRID_CELL_PAD, "min-w-[160px]"),
        },
      },
      {
        id: "ram",
        accessorKey: "ramPct",
        header: ({ column }) => (
          <span className="inline-flex items-center gap-1.5">
            <HardDriveIcon className="size-3.5 text-muted-foreground" />
            <DataGridSortHeader column={column} title="RAM" />
          </span>
        ),
        cell: ({ row }) => {
          const r = row.original
          const offline = r.server.status !== "online"
          const noMetrics = offline || !r.hasData
          if (noMetrics) {
            return <span className="text-xs text-muted-foreground/30">{offline ? "—" : "нет опроса"}</span>
          }
          return (
            <div className="flex flex-col gap-1.5 min-w-[155px]">
              <div className="flex items-center justify-between text-xs">
                <span className={cn("font-mono font-semibold", resPctColor(r.ramPct))}>{r.ramPct}%</span>
                <span className="text-muted-foreground/60 font-mono text-[10px]">
                  {fmtMB(r.ramUsed)}/{fmtMB(r.ramTotal)}
                </span>
              </div>
              <MiniBar pct={r.ramPct} />
            </div>
          )
        },
        meta: {
          headerTitle: "RAM",
          headerClassName: cn(DATA_GRID_CELL_PAD, "min-w-[175px]"),
          cellClassName: cn(DATA_GRID_CELL_PAD, "min-w-[175px]"),
        },
      },
      {
        id: "hdd",
        accessorKey: "hddPct",
        header: ({ column }) => (
          <span className="inline-flex items-center gap-1.5">
            <HardDriveIcon className="size-3.5 text-muted-foreground" />
            <DataGridSortHeader column={column} title="Диск" />
          </span>
        ),
        cell: ({ row }) => {
          const r = row.original
          const offline = r.server.status !== "online"
          const noMetrics = offline || !r.hasData
          if (noMetrics) {
            return <span className="text-xs text-muted-foreground/30">{offline ? "—" : "нет опроса"}</span>
          }
          return (
            <div className="flex flex-col gap-1.5 min-w-[155px]">
              <div className="flex items-center justify-between text-xs">
                <span className={cn("font-mono font-semibold", resPctColor(r.hddPct))}>{r.hddPct}%</span>
                <span className="text-muted-foreground/60 font-mono text-[10px]">
                  {fmtMB(r.hddUsed)}/{fmtMB(r.hddTotal)}
                </span>
              </div>
              <MiniBar pct={r.hddPct} />
            </div>
          )
        },
        meta: {
          headerTitle: "Диск",
          headerClassName: cn(DATA_GRID_CELL_PAD, "min-w-[175px]"),
          cellClassName: cn(DATA_GRID_CELL_PAD, "min-w-[175px]"),
        },
      },
      {
        id: "uptime",
        accessorKey: "uptimeSeconds",
        header: ({ column }) => (
          <span className="inline-flex items-center gap-1.5">
            <ClockIcon className="size-3.5 text-muted-foreground" />
            <DataGridSortHeader column={column} title="Uptime" />
          </span>
        ),
        cell: ({ row }) => {
          const r = row.original
          const offline = r.server.status !== "online"
          const noMetrics = offline || !r.hasData
          return (
            <span className="font-mono text-xs text-muted-foreground">
              {noMetrics ? "—" : fmtUptime(r.uptimeSeconds)}
            </span>
          )
        },
        meta: {
          headerTitle: "Uptime",
          headerClassName: DATA_GRID_CELL_PAD,
          cellClassName: DATA_GRID_CELL_PAD,
        },
      },
      {
        id: "temp",
        accessorKey: "temp",
        header: ({ column }) => (
          <span className="inline-flex items-center gap-1.5">
            <ThermometerIcon className="size-3.5 text-muted-foreground" />
            <DataGridSortHeader column={column} title="°C" />
          </span>
        ),
        cell: ({ row }) => {
          const r = row.original
          const offline = r.server.status !== "online"
          const noMetrics = offline || !r.hasData
          if (r.temp !== undefined && !noMetrics) {
            return (
              <span
                className={cn(
                  "font-mono text-sm font-semibold tabular-nums",
                  r.temp >= 70
                    ? "text-red-600 dark:text-red-400"
                    : r.temp >= 55
                      ? "text-amber-600 dark:text-amber-400"
                      : "text-muted-foreground",
                )}
              >
                {r.temp}°C
              </span>
            )
          }
          return <span className="text-muted-foreground/30 text-xs">—</span>
        },
        meta: {
          headerTitle: "°C",
          headerClassName: DATA_GRID_CELL_PAD_LAST,
          cellClassName: DATA_GRID_CELL_PAD_LAST,
        },
      },
    ],
    [],
  )

  const table = useReactTable({
    data: rows,
    columns,
    getCoreRowModel: getCoreRowModel(),
    getSortedRowModel: getSortedRowModel(),
    getRowId: (row) => row.serverId,
  })

  if (rows.length === 0) {
    return (
      <EmptyState
        icon={<SearchIcon className="size-4" />}
        title="Ничего не найдено"
        className="border-0 py-12"
      />
    )
  }

  return (
    <DataGridShell
      table={table}
      recordCount={rows.length}
      tableClassNames={{
        headerRow: "border-b border-border bg-muted/30",
        bodyRow: cn(
          "group/row hover:bg-muted/30",
          "[&:has([data-resource-offline=true])]:opacity-50",
          "[&:has([data-resource-crit=true])]:bg-red-500/3",
        ),
      }}
    />
  )
}

export { UptimeResourcesDataGrid, type UptimeResourcesDataGridProps }