import { useMemo, useState } from "react";
import { useAsyncData } from "../../lib/useAsyncData";
import { adminListPlugins, adminSetPluginPolicy, adminPluginUninstall, getStoredRole } from "../../lib/api";
import type { AdminPluginRecord } from "../../lib/types";
import { useAutoReload } from "../hooks";
import { useAuditStore } from "../audit";
import { AdminTable, Notice, PageHeader, type AdminColumn } from "../components";
import { Button, Surface, Switch, Tag } from "../../components/primitives";
import { InstalledPluginsPanel } from "./plugins/InstalledPlugins";

type CapKind = "tool" | "skill" | "channel";

const KIND_LABELS: Record<CapKind, string> = {
  tool: "工具 Tool",
  skill: "技能 Skill",
  channel: "渠道 Channel",
};

// Channel adapters are not gated by the tool policy (group/stranger markers are a
// tool concept; a channel is configured via its own 渠道管理 page), so the
// channel block shows identity + a pointer rather than the policy switches.
function channelColumns(): AdminColumn<AdminPluginRecord>[] {
  return [
    { key: "name", title: "名称", render: (p) => <span className="font-medium">{p.name}</span> },
    { key: "desc", title: "描述", render: (p) => <span className="block max-w-md truncate text-[var(--mu-text-mid)]">{p.description || "—"}</span> },
    { key: "admin", title: "配置", render: () => <span className="text-xs text-[var(--mu-text-lo)]">渠道配置见「渠道管理」页</span> },
  ];
}

/** Columns for a tool / skill row (has environment markers, owner can edit). */
function registeredColumns(
  isOwner: boolean,
  busy: string | null,
  setPolicy: (name: string, allowInGroup: boolean, allowInStranger: boolean) => void,
  uninstall: (name: string) => void,
): AdminColumn<AdminPluginRecord>[] {
  return [
    { key: "name", title: "名称", render: (p) => <span className="font-medium">{p.name}</span> },
    { key: "kind", title: "类型", render: (p) => <Tag tone="accent">{(KIND_LABELS as Record<string, string>)[p.kind] ?? p.kind}</Tag> },
    { key: "desc", title: "描述", render: (p) => <span className="block max-w-sm truncate text-[var(--mu-text-mid)]">{p.description || "—"}</span> },
    {
      key: "policy",
      title: "环境授权（owner）",
      render: (p) => (
        <span className="flex items-center gap-4">
          <label className="flex items-center gap-1.5">
            <Switch
              checked={p.allowInGroup}
              disabled={!isOwner || busy === p.name}
              onChange={(v) => setPolicy(p.name, v, p.allowInStranger)}
            />
            <span className="text-xs text-[var(--mu-text-mid)]">群聊</span>
          </label>
          <label className="flex items-center gap-1.5">
            <Switch
              checked={p.allowInStranger}
              disabled={!isOwner || busy === p.name}
              onChange={(v) => setPolicy(p.name, p.allowInGroup, v)}
            />
            <span className="text-xs text-[var(--mu-text-mid)]">陌生人</span>
          </label>
          {busy === p.name ? <span className="text-xs text-[var(--mu-text-lo)]">保存中…</span> : null}
        </span>
      ),
    },
    {
      key: "actions",
      title: "操作",
      render: (p) => (
        <Button size="sm" variant="ghost" disabled={!isOwner || busy !== null} onClick={() => uninstall(p.name)}>
          卸载
        </Button>
      ),
    },
  ];
}

export function PluginsModule(): React.ReactNode {
  const { data, loading, error, reload } = useAsyncData(adminListPlugins, []);
  useAutoReload(reload, 10000);
  const isOwner = getStoredRole() === "owner";
  const log = useAuditStore((s) => s.log);
  const [busy, setBusy] = useState<string | null>(null);
  const [fail, setFail] = useState<string | null>(null);
  const [msg, setMsg] = useState<string | null>(null);

  const uninstall = (name: string) => {
    setBusy(name);
    setFail(null);
    setMsg(null);
    adminPluginUninstall(name)
      .then(() => {
        log("plugin.uninstall", "ok");
        setMsg(`已卸载 ${name}`);
        reload();
      })
      .catch((err: unknown) => {
        log("plugin.uninstall", "error");
        setFail(err instanceof Error ? err.message : "卸载失败");
      })
      .finally(() => setBusy(null));
  };

  const setPolicy = (name: string, allowInGroup: boolean, allowInStranger: boolean) => {
    setBusy(name);
    setFail(null);
    adminSetPluginPolicy(name, allowInGroup, allowInStranger)
      .then(() => {
        log(`policy.set:${name}`, "ok");
        reload();
      })
      .catch((err: unknown) => {
        log(`policy.set:${name}`, "error");
        setFail(err instanceof Error ? err.message : "策略更新失败");
      })
      .finally(() => setBusy(null));
  };

  const byKind = useMemo(() => {
    const groups: Record<CapKind, AdminPluginRecord[]> = { tool: [], skill: [], channel: [] };
    for (const cap of data ?? []) {
      const k = cap.kind as CapKind;
      if (groups[k]) groups[k].push(cap);
    }
    return groups;
  }, [data]);

  const toolSkillColumns = registeredColumns(isOwner, busy, setPolicy, uninstall);
  const channelCols = channelColumns();

  return (
    <div className="space-y-5">
      <PageHeader
        title="插件与能力"
        subtitle="已注册能力（按工具 / 技能 / 渠道分组）+ 运行时 MCP 安装/卸载 · POST /api/v1/admin/plugins/policy (owner-only)"
      />

      {!isOwner ? <Notice tone="warn">当前角色为 {getStoredRole()}，工具策略/插件安装仅 owner 可写（读取/查看可见）。</Notice> : null}
      {fail ? <Notice tone="err">{fail}</Notice> : null}
      {msg ? <Notice tone="ok">{msg}</Notice> : null}

      <InstalledPluginsPanel />

      <Surface className="space-y-3">
        <div className="flex flex-wrap items-center gap-2">
          <h3 className="text-sm font-semibold">已注册能力</h3>
          <span className="text-xs text-[var(--mu-text-lo)]">GET /api/v1/admin/plugins · 按工具 / 技能 / 渠道分组</span>
        </div>

        {(["tool", "skill"] as CapKind[]).map((kind) => {
          const rows = byKind[kind];
          return (
            <div key={kind} className="space-y-1.5">
              <div className="flex items-center gap-2 pt-1">
                <Tag tone="accent">{KIND_LABELS[kind]}</Tag>
                <span className="text-xs text-[var(--mu-text-lo)]">{rows.length} 个</span>
              </div>
              <AdminTable
                columns={toolSkillColumns}
                rows={loading ? null : rows}
                loading={loading}
                error={error}
                emptyTitle={`无${KIND_LABELS[kind]}`}
                rowKey={(p) => `${kind}:${p.name}`}
              />
            </div>
          );
        })}

        <div className="space-y-1.5">
          <div className="flex items-center gap-2 pt-1">
            <Tag tone="neutral">{KIND_LABELS.channel}</Tag>
            <span className="text-xs text-[var(--mu-text-lo)]">{byKind.channel.length} 个</span>
          </div>
          <AdminTable
            columns={channelCols}
            rows={loading ? null : byKind.channel}
            loading={loading}
            error={error}
            emptyTitle="无渠道"
            rowKey={(p) => `channel:${p.name}`}
          />
        </div>
      </Surface>

      <Notice>工具 schema / 技能为后端 M10+ 提供；此页按类型分组展示已注册能力。群聊/陌生人环境可见性标记（默认关闭）仅对工具/技能生效。</Notice>
    </div>
  );
}