import { useState, useMemo } from "react";
import { useTranslation } from "react-i18next";
import { cn } from "@/lib/utils";
import { Button } from "@/components/ui/button";
import { Input } from "@/components/ui/input";
import { Checkbox } from "@/components/ui/checkbox";
import {
  DropdownMenu,
  DropdownMenuContent,
  DropdownMenuItem,
  DropdownMenuLabel,
  DropdownMenuSeparator,
  DropdownMenuTrigger,
} from "@/components/ui/dropdown-menu";
import {
  Table,
  TableBody,
  TableCell,
  TableHead,
  TableHeader,
  TableRow,
} from "@/components/ui/table";
import {
  Select,
  SelectContent,
  SelectItem,
  SelectTrigger,
  SelectValue,
} from "@/components/ui/select";
import {
  Search,
  Plus,
  Trash2,
  Download,
  Upload,
  Cloud,
  FileSpreadsheet,
  RefreshCw,
  ChevronLeft,
  ChevronRight,
} from "lucide-react";
import { useServers, useServerMutations } from "@/hooks/api";
import { ServerStatsStrip } from "./ServerStatsStrip";
import { useConfirm } from "@/components/ui/confirm-dialog";
import { toast } from "sonner";
import { CloudServerImport } from "./CloudServerImport";
import { TerminalDialog } from "./TerminalDialog";
import { RdpDialog } from "./RdpDialog";
import { ServerFileBrowser } from "./ServerFileBrowser";
import type { JsonData } from "@/types/common";
import { ExcelServerImport } from "./ExcelServerImport";
import { ServerForm, EMPTY_FORM, type ServerFormData } from "./ServerForm";
import { getTags } from "./serverHelpers";
import { ServerTableRow } from "./ServerTableRow";
import { ServerDetailSheet } from "./ServerDetailSheet";
import { usePermission } from "@/hooks/usePermission";
import { PageShell } from "@/components/layout/PageShell";
import { ContentPanel } from "@/components/layout/ContentPanel";
import { Server } from "lucide-react";

export function ServerManager() {
  const { t } = useTranslation();
  const confirm = useConfirm();
  const { hasPermission } = usePermission();
  const [selectedServers, setSelectedServers] = useState<string[]>([]);
  const [searchQuery, setSearchQuery] = useState("");
  const [statusFilter, setStatusFilter] = useState<string>("all");
  const [cloudImportOpen, setCloudImportOpen] = useState(false);
  const [excelImportOpen, setExcelImportOpen] = useState(false);

  // 创建/编辑表单状态
  const [formOpen, setFormOpen] = useState(false);
  const [editingId, setEditingId] = useState<string | null>(null);
  const [formData, setFormData] = useState<ServerFormData>(EMPTY_FORM);
  const [formSaving, setFormSaving] = useState(false);
  const [detailsOpen, setDetailsOpen] = useState(false);

  // 终端 Dialog 状态
  const [terminalOpen, setTerminalOpen] = useState(false);
  const [terminalServer, setTerminalServer] = useState<{
    id: number;
    name: string;
    ip: string;
    username?: string;
    hasAuth?: boolean;
  } | null>(null);
  const [rdpOpen, setRdpOpen] = useState(false);
  const [rdpServer, setRdpServer] = useState<{
    id: number;
    name: string;
    ip: string;
  } | null>(null);

  // 文件浏览 Dialog 状态
  const [fileBrowserOpen, setFileBrowserOpen] = useState(false);
  const [fileBrowserServer, setFileBrowserServer] = useState<{
    id: number;
    name: string;
  } | null>(null);
  const [detailServer, setDetailServer] = useState<JsonData | null>(null);

  // 分页状态
  const [page, setPage] = useState(1);
  const [pageSize, setPageSize] = useState(10);

  const queryParams = useMemo(() => {
    const params: Record<string, unknown> = { page, page_size: pageSize };
    if (searchQuery) params.keyword = searchQuery;
    if (statusFilter && statusFilter !== "all") params.status = statusFilter;
    return params;
  }, [page, pageSize, searchQuery, statusFilter]);

  const {
    data,
    isLoading: loading,
    isFetching,
    refetch,
  } = useServers(queryParams);
  const {
    createMutation,
    updateMutation,
    deleteMutation,
    batchDeleteMutation,
  } = useServerMutations();
  const servers = data?.list ?? [];
  const total = data?.total ?? 0;

  const getServerDisplayName = (server: JsonData) =>
    server.alias || server.cloud_instance_name || server.hostname || server.ip || "";

  // 详情抽屉内打开终端/RDP/文件时先关闭抽屉，避免同 z-index 的 Sheet 遮挡弹窗 // Logan.Li
  const closeDetailSheet = () => setDetailServer(null);

  const openTerminal = (server: JsonData) => {
    closeDetailSheet();
    setTerminalServer({
      id: server.id,
      name: getServerDisplayName(server),
      ip: server.ip,
      username: server.username || "root",
      hasAuth: server.has_auth ?? true,
    });
    setTerminalOpen(true);
  };

  const openRdp = (server: JsonData) => {
    closeDetailSheet();
    setRdpServer({ id: server.id, name: getServerDisplayName(server), ip: server.ip });
    setRdpOpen(true);
  };

  const openFileBrowser = (server: JsonData) => {
    closeDetailSheet();
    setFileBrowserServer({ id: server.id, name: getServerDisplayName(server) });
    setFileBrowserOpen(true);
  };

  // 搜索/筛选变化时重置到第1页
  const handleSearch = (val: string) => {
    setSearchQuery(val);
    setPage(1);
  };
  const handleStatusFilter = (val: string) => {
    setStatusFilter(val);
    setPage(1);
  };

  // 导出 CSV
  const toggleSelectAll = () => {
    if (selectedServers.length === servers.length) {
      setSelectedServers([]);
    } else {
      setSelectedServers(servers.map((s) => String(s.id)));
    }
  };

  const toggleSelect = (id: string) => {
    if (selectedServers.includes(id)) {
      setSelectedServers(selectedServers.filter((s) => s !== id));
    } else {
      setSelectedServers([...selectedServers, id]);
    }
  };

  const handleDelete = async (id: string) => {
    const server = servers.find((s) => String(s.id) === String(id));
    const name = server ? getServerDisplayName(server) : id;
    const ok = await confirm({
      title: t("server.deleteTitle"),
      description: t("server.deleteConfirm", {
        name,
        ip: server?.ip || "-",
      }),
      confirmText: t("common.delete"),
      variant: "destructive",
    });
    if (!ok) return;
    try {
      await deleteMutation.mutateAsync(id);
      toast.success(t("server.deleted"));
    } catch (e) {
      console.error("[ServerManager] delete failed:", e);
      toast.error(t("server.deleteFailed"));
    }
  };

  // 批量删除
  const handleBatchDelete = async () => {
    if (selectedServers.length === 0) return;
    const ok = await confirm({
      title: t("server.batchDeleteTitle"),
      description: t("server.batchDeleteConfirm", {
        count: selectedServers.length,
      }),
      confirmText: t("server.batchDelete"),
      variant: "destructive",
    });
    if (!ok) return;
    try {
      await batchDeleteMutation.mutateAsync(
        selectedServers.map((id) => Number(id)),
      );
      toast.success(
        t("server.deletedCount", { count: selectedServers.length }),
      );
      setSelectedServers([]);
    } catch (e) {
      console.error("[ServerManager] batch delete failed:", e);
      toast.error(t("server.batchDeleteFailed"));
    }
  };

  // 打开创建表单
  const openCreateForm = () => {
    setEditingId(null);
    setFormData(EMPTY_FORM);
    setDetailsOpen(false);
    setFormOpen(true);
  };

  // 打开编辑表单
  const openEditForm = (server: JsonData) => {
    setEditingId(server.id);
    setFormData({
      hostname: server.hostname || "",
      alias: server.alias || "",
      ip: server.ip || "",
      public_ip: server.public_ip || "",
      port: String(server.port || 22),
      username: server.username || "root",
      auth_type: server.auth_type || "password",
      os_type:
        server.os_type || (server.protocol === "rdp" ? "windows" : "linux"),
      protocol:
        server.protocol || (server.os_type === "windows" ? "rdp" : "ssh"),
      rdp_port: String(server.rdp_port || 3389),
      password: "",
      ssh_key: "",
      credential_id: null as number | null,
      os: server.os || "",
      cpu: String(server.cpu || ""),
      memory: server.memory ? String(Math.round(server.memory / 1024)) : "", // MB → GB
      disk: String(server.disk || ""),
      status: server.status || "running",
      tags: server.tags || "",
      description: server.description || "",
    });
    setDetailsOpen(false);
    setFormOpen(true);
  };

  // 保存表单
  const handleSave = async () => {
    if (!formData.hostname || !formData.ip) return;
    try {
      setFormSaving(true);
      const payload: Record<string, unknown> = {
        hostname: formData.hostname,
        alias: formData.alias,
        ip: formData.ip,
        public_ip: formData.public_ip || undefined,
        port: Number(formData.port) || 22,
        os_type: formData.os_type || "linux",
        protocol: formData.protocol || "ssh",
        rdp_port: Number(formData.rdp_port) || 3389,
        username: formData.username || "root",
        auth_type: formData.auth_type || "password",
        os: formData.os,
        cpu: Number(formData.cpu) || 0,
        memory: (Number(formData.memory) || 0) * 1024, // GB → MB
        disk: Number(formData.disk) || 0,
        status: formData.status,
        tags: formData.tags || undefined,
        description: formData.description || undefined,
      };
      // 凭证关联 — 下拉选择后自动关联，无需手输密码
      if (formData.credential_id) {
        payload.credential_id = formData.credential_id;
      } else {
        // 手动输入模式：仅填了密码才提交
        if (formData.password) {
          payload.password = formData.password;
        }
        if (formData.ssh_key) {
          payload.ssh_key = formData.ssh_key;
        }
      }
      if (editingId) {
        await updateMutation.mutateAsync({ id: editingId, data: payload });
      } else {
        await createMutation.mutateAsync(payload);
      }
      toast.success(editingId ? t("server.updated") : t("server.created"));
      setFormOpen(false);
    } catch (e) {
      console.error("[ServerManager] save failed:", e);
      toast.error(t("server.saveFailed"));
    } finally {
      setFormSaving(false);
    }
  };

  // 导出 CSV — 将当前服务器列表导出为 CSV 文件 // Logan.Li
  const handleExport = () => {
    if (servers.length === 0) {
      toast.error(t("server.noExportData"));
      return;
    }
    const headers = [
      t("server.csv.name"),
      t("server.csv.hostname"),
      t("server.csv.ip"),
      t("server.csv.publicIp"),
      t("server.csv.port"),
      t("server.csv.os"),
      t("server.csv.cpu"),
      t("server.csv.memory"),
      t("server.csv.disk"),
      t("server.csv.status"),
      t("server.csv.tags"),
    ];
    const rows = servers.map((s) => {
      const memGB = s.memory ? Math.round(Number(s.memory) / 1024) : 0;
      const tags = getTags(s).join(";");
      return [
        getServerDisplayName(s),
        s.hostname || "",
        s.ip || "",
        s.public_ip || "",
        s.port || 22,
        s.os || "",
        s.cpu || 0,
        memGB,
        s.disk || 0,
        s.status || "",
        tags,
      ];
    });
    const csv = [headers, ...rows]
      .map((row) =>
        row.map((cell) => `"${String(cell).replace(/"/g, '""')}"`).join(","),
      )
      .join("\n");
    const blob = new Blob(["\ufeff" + csv], {
      type: "text/csv;charset=utf-8;",
    });
    const url = URL.createObjectURL(blob);
    const a = document.createElement("a");
    a.href = url;
    a.download = `servers_${new Date().toISOString().slice(0, 10)}.csv`;
    a.click();
    URL.revokeObjectURL(url);
    toast.success(t("server.exported", { count: servers.length }));
  };

  const colSpanCount = 8;

  const tableToolbar = (
    <>
      <div className="flex items-center gap-3 flex-wrap">
        <div className="relative w-64">
          <Search className="absolute left-3 top-1/2 -translate-y-1/2 h-4 w-4 dg-text-muted" />
          <Input
            placeholder={t("server.searchPlaceholder")}
            value={searchQuery}
            onChange={(e) => handleSearch(e.target.value)}
            className="pl-9 h-9 dg-input"
          />
        </div>
        <Select value={statusFilter} onValueChange={handleStatusFilter}>
          <SelectTrigger className="w-32 h-9 dg-input">
            <SelectValue placeholder={t("common.status")} />
          </SelectTrigger>
          <SelectContent>
            <SelectItem value="all">{t("server.allStatus")}</SelectItem>
            <SelectItem value="running">{t("common.running")}</SelectItem>
            <SelectItem value="stopped">{t("common.stopped")}</SelectItem>
            <SelectItem value="maintenance">
              {t("common.maintenance")}
            </SelectItem>
            <SelectItem value="offline">{t("common.offline")}</SelectItem>
          </SelectContent>
        </Select>
      </div>
      {selectedServers.length > 0 && (
        <div className="flex items-center gap-2">
          <span className="text-sm dg-text-secondary">
            {t("server.selected", { count: selectedServers.length })}
          </span>
          {hasPermission("server:delete") && (
            <Button
              variant="outline"
              size="sm"
              className="dg-btn-danger dg-btn-sm"
              onClick={handleBatchDelete}
            >
              <Trash2 className="h-4 w-4 mr-2" />
              {t("server.batchDelete")}
            </Button>
          )}
        </div>
      )}
    </>
  );

  return (
    <PageShell
      variant="list"
      title={t("server.title")}
      subtitle={t("server.subtitle")}
      icon={<Server className="h-5 w-5" />}
      metrics={<ServerStatsStrip servers={servers} />}
      actions={
        <>
          <Button
            variant="outline"
            className="dg-btn-secondary"
            onClick={() => refetch()}
            disabled={isFetching}
          >
            <RefreshCw
              className={cn("h-4 w-4 mr-2", isFetching && "animate-spin")}
            />
            {t("common.refresh")}
          </Button>
          <Button
            variant="outline"
            className="dg-btn-secondary"
            onClick={handleExport}
          >
            <Download className="h-4 w-4 mr-2" />
            {t("common.export")}
          </Button>
          {hasPermission("server:create") && (
            <DropdownMenu>
              <DropdownMenuTrigger asChild>
                <Button variant="outline" className="dg-btn-secondary">
                  <Upload className="h-4 w-4 mr-2" />
                  {t("server.batchImport")}
                </Button>
              </DropdownMenuTrigger>
              <DropdownMenuContent>
                <DropdownMenuLabel>
                  {t("server.importMethod")}
                </DropdownMenuLabel>
                <DropdownMenuSeparator />
                <DropdownMenuItem onClick={() => setCloudImportOpen(true)}>
                  <Cloud className="h-4 w-4 mr-2 dg-text-blue" />
                  {t("server.cloudImport")}
                  <span className="ml-2 text-xs dg-text-muted">
                    {t("server.cloudImportHint")}
                  </span>
                </DropdownMenuItem>
                <DropdownMenuItem onClick={() => setExcelImportOpen(true)}>
                  <FileSpreadsheet className="h-4 w-4 mr-2 dg-text-green" />
                  {t("server.csvImport")}
                  <span className="ml-2 text-xs dg-text-muted">
                    {t("server.csvImportHint")}
                  </span>
                </DropdownMenuItem>
              </DropdownMenuContent>
            </DropdownMenu>
          )}
          {hasPermission("server:create") && (
            <Button className="dg-btn-primary" onClick={openCreateForm}>
              <Plus className="h-4 w-4 mr-2" />
              {t("server.addServer")}
            </Button>
          )}
        </>
      }
    >
      <ContentPanel toolbar={tableToolbar}>
        <div>
          <Table>
            <TableHeader>
              <TableRow className="border-[var(--dg-border)] hover:bg-transparent">
                <TableHead className="w-12">
                  <Checkbox
                    checked={
                      selectedServers.length === servers.length &&
                      servers.length > 0
                    }
                    onCheckedChange={toggleSelectAll}
                  />
                </TableHead>
                <TableHead className="text-[var(--dg-text-secondary)]">
                  {t("server.assetName")}
                </TableHead>
                <TableHead className="text-[var(--dg-text-secondary)]">
                  {t("server.ipAddress")}
                </TableHead>
                <TableHead className="text-[var(--dg-text-secondary)]">
                  {t("server.publicIp")}
                </TableHead>
                <TableHead className="text-[var(--dg-text-secondary)]">
                  {t("common.status")}
                </TableHead>
                <TableHead className="text-[var(--dg-text-secondary)]">
                  {t("server.config")}
                </TableHead>
                <TableHead className="text-[var(--dg-text-secondary)]">
                  {t("server.tags")}
                </TableHead>
                <TableHead className="text-[var(--dg-text-secondary)] text-right">
                  {t("common.actions")}
                </TableHead>
              </TableRow>
            </TableHeader>
            <TableBody>
              {loading ? (
                <TableRow className="border-[var(--dg-border)]">
                  <TableCell
                    colSpan={colSpanCount}
                    className="text-center text-[var(--dg-text-muted)] py-12"
                  >
                    <RefreshCw className="h-5 w-5 animate-spin mx-auto mb-2" />
                    {t("common.loading")}
                  </TableCell>
                </TableRow>
              ) : servers.length === 0 ? (
                <TableRow className="border-[var(--dg-border)]">
                  <TableCell
                    colSpan={colSpanCount}
                    className="text-center text-[var(--dg-text-muted)] py-12"
                  >
                    {t("server.noData")}
                  </TableCell>
                </TableRow>
              ) : (
                servers.map((server) => (
                  <ServerTableRow
                    key={server.id}
                    server={server}
                    selected={selectedServers.includes(String(server.id))}
                    onToggleSelect={toggleSelect}
                    onOpenTerminal={openTerminal}
                    onOpenRdp={openRdp}
                    onOpenFiles={openFileBrowser}
                    onOpenEdit={openEditForm}
                    onOpenDetail={setDetailServer}
                    onDelete={handleDelete}
                  />
                ))
              )}
            </TableBody>
          </Table>
        </div>

        {/* 分页 */}
        <div className="flex items-center justify-between px-4 py-3 border-t border-[var(--dg-border)]">
          <div className="flex items-center gap-2 text-sm text-[var(--dg-text-muted)]">
            <span>{t("server.perPage")}</span>
            <Select
              value={String(pageSize)}
              onValueChange={(v) => {
                setPageSize(Number(v));
                setPage(1);
              }}
            >
              <SelectTrigger className="w-16 h-8 bg-[var(--dg-bg-tertiary)] border-[var(--dg-border)] text-[var(--dg-text-primary)] text-xs">
                <SelectValue />
              </SelectTrigger>
              <SelectContent className="bg-[var(--dg-bg-tertiary)] border-[var(--dg-border)]">
                <SelectItem value="10">10</SelectItem>
                <SelectItem value="20">20</SelectItem>
                <SelectItem value="30">30</SelectItem>
              </SelectContent>
            </Select>
            <span>{t("server.items")}</span>
            <span className="ml-4">
              {t("server.totalItems", { count: total })}
            </span>
          </div>
          <div className="flex items-center gap-1">
            <Button
              variant="outline"
              size="sm"
              className="h-8 border-[var(--dg-border)] text-[var(--dg-text-secondary)] hover:text-[var(--dg-text-primary)] hover:bg-[var(--dg-bg-hover)]"
              disabled={page <= 1}
              onClick={() => setPage((p) => Math.max(1, p - 1))}
            >
              <ChevronLeft className="h-4 w-4" />
            </Button>
            <span className="text-sm text-[var(--dg-text-secondary)] px-2">
              {page} / {Math.max(1, Math.ceil(total / pageSize))}
            </span>
            <Button
              variant="outline"
              size="sm"
              className="h-8 border-[var(--dg-border)] text-[var(--dg-text-secondary)] hover:text-[var(--dg-text-primary)] hover:bg-[var(--dg-bg-hover)]"
              disabled={page >= Math.ceil(total / pageSize)}
              onClick={() => setPage((p) => p + 1)}
            >
              <ChevronRight className="h-4 w-4" />
            </Button>
          </div>
        </div>
      </ContentPanel>

      {/* 创建/编辑服务器 Dialog */}
      <ServerForm
        open={formOpen}
        onOpenChange={setFormOpen}
        editingId={editingId}
        formData={formData}
        setFormData={setFormData}
        detailsOpen={detailsOpen}
        setDetailsOpen={setDetailsOpen}
        onSave={handleSave}
        formSaving={formSaving}
      />
      <RdpDialog
        open={rdpOpen}
        onOpenChange={setRdpOpen}
        serverId={rdpServer?.id ?? null}
        serverName={rdpServer?.name || ""}
        serverIp={rdpServer?.ip || ""}
      />

      {/* Import Dialogs */}
      <CloudServerImport
        open={cloudImportOpen}
        onClose={() => {
          setCloudImportOpen(false);
          refetch();
        }}
      />
      <ExcelServerImport
        open={excelImportOpen}
        onClose={() => {
          setExcelImportOpen(false);
          refetch();
        }}
      />

      {/* 终端 Dialog */}
      <TerminalDialog
        open={terminalOpen}
        onOpenChange={setTerminalOpen}
        serverId={terminalServer?.id ?? null}
        serverName={terminalServer?.name ?? ""}
        serverIp={terminalServer?.ip ?? ""}
        username={terminalServer?.username || "root"}
        hasAuth={terminalServer?.hasAuth ?? true}
      />

      <ServerDetailSheet
        open={!!detailServer}
        onOpenChange={(v) => {
          if (!v) setDetailServer(null);
        }}
        server={
          detailServer
            ? servers.find((s) => String(s.id) === String(detailServer.id)) || detailServer
            : null
        }
        onOpenTerminal={openTerminal}
        onOpenRdp={openRdp}
        onOpenFiles={openFileBrowser}
        onOpenEdit={(s) => {
          setDetailServer(null);
          openEditForm(s);
        }}
      />

      {/* 文件浏览 Dialog */}
      <ServerFileBrowser
        open={fileBrowserOpen}
        onOpenChange={setFileBrowserOpen}
        serverId={fileBrowserServer?.id ?? null}
        serverName={fileBrowserServer?.name ?? ""}
      />
    </PageShell>
  );
}