import { useEffect, useRef, useState } from "react";
import { driverImportOffline, driverInstall, driverStatus, type DriverStatusItem } from "./api";
import { driverById } from "./catalog";
import { DriverIcon } from "./DriverIcon";
import { OpsModal } from "./OpsModal";
import { useWorkspaceStore } from "./store";

const LABELS: Record<string, string> = {
  mongodb: "MongoDB",
  zookeeper: "ZooKeeper",
  dameng: "达梦 DM8",
};

function fmtSize(n: number): string {
  if (n >= 1 << 20) return `${(n / (1 << 20)).toFixed(1)} MB`;
  if (n >= 1 << 10) return `${(n / (1 << 10)).toFixed(0)} KB`;
  return `${n} B`;
}

/**
 * 驱动管理弹框：agent 驱动（MongoDB / ZooKeeper / 达梦）的运行时状态与维护入口。
 * 在线环境首次连接会自动下载；这里提供预装、离线包导入与商用 jar 指引。
 */
export function DriverManager({ onClose }: { onClose: () => void }) {
  const notify = useWorkspaceStore((s) => s.notify);
  const notifyError = useWorkspaceStore((s) => s.notifyError);
  const [items, setItems] = useState<DriverStatusItem[] | null>(null);
  const [busy, setBusy] = useState<string | null>(null);
  const fileRef = useRef<HTMLInputElement>(null);

  const reload = async () => {
    try {
      setItems(await driverStatus());
    } catch (e) {
      notifyError(e, "toast");
    }
  };
  useEffect(() => {
    void reload();
    // eslint-disable-next-line react-hooks/exhaustive-deps
  }, []);

  const install = async (id: string) => {
    setBusy(id);
    try {
      const r = await driverInstall(id);
      if (r.drivers) setItems(r.drivers);
      if (r.ok) {
        notify({ kind: "success", title: "安装完成", message: `${LABELS[id] ?? id} 驱动已就绪`, mode: "toast" });
      } else {
        notify({ kind: "error", title: "安装失败", message: r.error ?? "未知错误", mode: "modal" });
      }
    } catch (e) {
      notifyError(e, "modal");
    } finally {
      setBusy(null);
    }
  };

  const importZip = async (f: File) => {
    setBusy("import");
    try {
      const r = await driverImportOffline(f);
      if (r.drivers) setItems(r.drivers);
      if (r.ok) {
        notify({ kind: "success", title: "导入完成", message: `已导入 ${r.imported} 个文件`, mode: "toast" });
      } else {
        notify({ kind: "error", title: "导入失败", message: r.error ?? "包校验失败", mode: "modal" });
      }
    } catch (e) {
      notifyError(e, "modal");
    } finally {
      setBusy(null);
      if (fileRef.current) fileRef.current.value = "";
    }
  };

  const jdk = items?.find((x) => x.jdkRequired);

  return (
    <OpsModal variant="info" title="驱动管理" onOk={onClose}>
      <div className="space-y-2" style={{ minWidth: 480 }}>
        {/* 环境状态行 */}
        <div
          className="flex items-center gap-3 rounded border px-2.5 py-1.5 text-[11.5px]"
          style={{ borderColor: "var(--ops-border)", background: "var(--ops-surface-2)" }}
        >
          <span style={{ color: "var(--ops-muted)" }}>JVM：</span>
          {jdk?.jdkOk ? (
            <span style={{ color: "var(--ops-accent)" }}>已检测到 Java {jdk.javaVersion}</span>
          ) : (
            <span style={{ color: "var(--ops-danger)" }}>未找到 Java（agent 驱动需 JDK 17+）</span>
          )}
          <span style={{ color: "var(--ops-muted)" }}>·</span>
          <span style={{ color: "var(--ops-muted)" }}>agent：</span>
          <span style={{ color: items?.[0]?.agentInstalled ? "var(--ops-accent)" : "var(--ops-warning)" }}>
            {items?.[0]?.agentInstalled ? "已安装" : "缺失（连接时自动下载）"}
          </span>
        </div>

        {/* 驱动行 */}
        {items === null && <div className="py-3 text-[12px]" style={{ color: "var(--ops-muted)" }}>加载中…</div>}
        {items?.map((d) => {
          const done = d.allInstalled;
          const badge = !d.jdkOk
            ? { t: "缺 JDK", c: "var(--ops-danger)" }
            : done
              ? { t: "已安装", c: "var(--ops-accent)" }
              : d.license === "proprietary"
                ? { t: "需自备 jar", c: "var(--ops-warning)" }
                : { t: "未安装", c: "var(--ops-muted)" };
          const total = d.jars.reduce((s, j) => s + (j.size || 0), 0);
          const got = d.jars.filter((j) => j.installed).length;
          return (
            <div
              key={d.id}
              className="flex items-center gap-2.5 rounded border px-2.5 py-2"
              style={{ borderColor: "var(--ops-border-soft)" }}
            >
              <DriverIcon driver={d.id} size={20} />
              <div className="min-w-0 flex-1">
                <div className="flex items-center gap-2">
                  <span className="text-[12.5px] font-medium">{LABELS[d.id] ?? d.label}</span>
                  <span
                    className="rounded px-1 text-[10px]"
                    style={{ color: badge.c, background: `color-mix(in srgb, ${badge.c} 12%, transparent)` }}
                  >
                    {badge.t}
                  </span>
                </div>
                <div className="text-[10.5px]" style={{ color: "var(--ops-muted)" }}>
                  {d.license === "proprietary"
                    ? "商用许可不代下载：把官方 DmJdbcDriver jar 放到 ~/.opsxdb/drivers/dameng/"
                    : d.jars.length > 0
                      ? `驱动 jar ${got}/${d.jars.length}${total > 0 ? ` · ${fmtSize(total)}` : ""}${d.autoFetch ? " · 连接时自动下载" : ""}`
                      : "—"}
                </div>
              </div>
              {d.autoFetch && !done && d.jdkOk && (
                <button
                  type="button"
                  className="ops-btn-secondary h-6 px-2 text-[11px]"
                  disabled={busy !== null}
                  onClick={() => void install(d.id)}
                >
                  {busy === d.id ? "安装中…" : "安装"}
                </button>
              )}
            </div>
          );
        })}

        {/* 离线包导入 */}
        <div
          className="flex items-center gap-2 border-t pt-2 text-[11px]"
          style={{ borderColor: "var(--ops-border-soft)", color: "var(--ops-muted)" }}
        >
          <span>内网/离线：</span>
          <button
            type="button"
            className="ops-btn-secondary h-6 px-2 text-[11px]"
            disabled={busy !== null}
            onClick={() => fileRef.current?.click()}
          >
            {busy === "import" ? "导入中…" : "导入离线驱动包…"}
          </button>
          <span className="truncate">（opsxdb-driver 仓库 pack.sh 产物 .zip）</span>
          <input
            ref={fileRef}
            type="file"
            accept=".zip"
            className="hidden"
            onChange={(e) => {
              const f = e.target.files?.[0];
              if (f) void importZip(f);
            }}
          />
        </div>
      </div>
    </OpsModal>
  );
}