import { Download, RefreshCw } from "lucide-react";
import { useCallback, useEffect, useMemo, useState } from "react";

import { platformApiClient } from "../api/client";
import type { DependencyProbeViewResponse, JobResponse, ServerInstanceResponse } from "../api/types";
import type { PageComponentProps } from "../contracts/page";
import {
  canUpdateServerGame,
  gameUpdateStatusFromProbe,
  gameUpdateStatusLabel,
  steamUpdateProbe,
  type GameUpdateStatus
} from "../contracts/serverManagement";
import { dependencyJobRequest, serverLifecycleCommandRequest } from "../schemas/serverManagement";
import { ConfirmDialog } from "./OperationControls";
import { ResultBadge } from "./StateViews";

const dependencyCheckPollAttempts = 45;
const dependencyCheckPollMs = 2000;

export function gameUpdateCheckNote(status?: GameUpdateStatus): string {
  if (!status) {
    return "尚未检查过 SCUM 公开分支版本。";
  }
  if (status.availability === "available") {
    const installed = status.installed ? `本地 ${status.installed}` : "本地版本未知";
    const latest = status.latest ? `公开分支 ${status.latest}` : "公开分支版本未知";
    return `${installed}，${latest}，可以执行更新。`;
  }
  if (status.availability === "up-to-date") {
    return status.installed ? `本地版本 ${status.installed} 已与公开分支一致。` : "本地版本已与公开分支一致。";
  }
  return "SteamCMD 未返回可比较的版本号，请稍后重新检查或在服务器上确认 SteamCMD 可用。";
}

interface ServerGameUpdatePanelProps {
  instance: ServerInstanceResponse;
  session: PageComponentProps["session"];
  operations: PageComponentProps["operations"];
  canManage: boolean;
  onChanged: () => void;
}

export function ServerGameUpdatePanel({ instance, session, operations, canManage, onChanged }: ServerGameUpdatePanelProps) {
  const [probe, setProbe] = useState<DependencyProbeViewResponse | null>(null);
  const [supported, setSupported] = useState(false);
  const [busy, setBusy] = useState<"check" | "update" | null>(null);
  const [note, setNote] = useState<string | null>(null);
  const [result, setResult] = useState<{ status: "succeeded" | "failed" | "pending"; label: string } | null>(null);
  const [confirmUpdate, setConfirmUpdate] = useState(false);
  const status = useMemo(() => gameUpdateStatusFromProbe(probe ?? undefined), [probe]);
  const updateAvailable = status?.availability === "available";
  const updateAllowed = updateAvailable && canUpdateServerGame(instance.state);

  const loadCatalog = useCallback(async () => {
    try {
      const catalog = await platformApiClient.getDependencyCatalog(instance.id);
      const candidate = steamUpdateProbe(catalog) ?? null;
      setProbe(candidate);
      setSupported(candidate !== null);
    } catch {
      setProbe(null);
      setSupported(false);
    }
  }, [instance.id]);

  useEffect(() => {
    void loadCatalog();
  }, [loadCatalog]);

  async function checkForUpdate() {
    if (!probe) {
      return;
    }
    const operationId = operations.begin({ intent: "检查游戏更新", targetKind: "server", targetId: instance.id, requester: session.displayName });
    setBusy("check");
    setNote("正在向 SteamCMD 查询 SCUM 公开分支版本…");
    setResult({ status: "pending", label: "正在检查版本" });
    try {
      const job = await platformApiClient.checkDependencies(instance.id, dependencyJobRequest(instance.id, probe.key));
      const finalJob = await waitForDependencyCheckJob(job.id);
      if (!finalJob) {
        throw new Error("版本检查任务还没有返回结果，可稍后在运维控制台查看该任务。");
      }
      if (finalJob.state !== "succeeded") {
        throw new Error(finalJob.progress.message || finalJob.executionResult?.summary || "版本检查失败");
      }
      const catalog = await platformApiClient.getDependencyCatalog(instance.id);
      const candidate = steamUpdateProbe(catalog) ?? null;
      setProbe(candidate);
      const label = gameUpdateStatusLabel(gameUpdateStatusFromProbe(candidate ?? undefined));
      const summary = gameUpdateCheckNote(gameUpdateStatusFromProbe(candidate ?? undefined));
      setNote(summary);
      setResult({ status: "succeeded", label });
      operations.succeed(operationId, `游戏版本检查完成：${label}。${summary}`, finalJob);
    } catch (error) {
      const reason = error instanceof Error ? error.message : "版本检查失败";
      setNote(reason);
      setResult({ status: "failed", label: reason });
      operations.fail(operationId, reason, operationId);
    } finally {
      setBusy(null);
    }
  }

  async function submitUpdate() {
    const operationId = operations.begin({ intent: "更新游戏版本", targetKind: "server", targetId: instance.id, requester: session.displayName });
    setBusy("update");
    try {
      const response = await platformApiClient.updateServerGame(instance.id, serverLifecycleCommandRequest(instance, "update"));
      const message = `更新任务 ${response.job.id} 已派发：先按插件声明优雅关闭 SCUM 服务，再执行 SteamCMD 更新，成功后自动重新启动。`;
      setNote(message);
      setResult({ status: "pending", label: "更新任务已派发" });
      operations.succeed(operationId, message, response.job);
      onChanged();
    } catch (error) {
      const reason = error instanceof Error ? error.message : "更新派发失败";
      setNote(reason);
      setResult({ status: "failed", label: reason });
      operations.fail(operationId, reason, operationId);
    } finally {
      setBusy(null);
    }
  }

  if (!supported || !probe) {
    return null;
  }

  return (
    <article className="console-panel console-module server-game-update-panel" aria-label="game version update">
      <div className="panel-header">
        <h2>
          <RefreshCw size={16} style={{ verticalAlign: "-2px" }} /> 游戏版本更新
        </h2>
        {result && <ResultBadge status={result.status} label={result.label} />}
      </div>
      <p className="section-copy">检查 Steam 公开分支的 SCUM 版本号，发现新版本后更新按钮会点亮。更新会先通过插件声明的优雅关机流程停止 SCUM 服务，关闭失败时中止更新，不会直接结束进程。</p>
      <dl className="console-stat-strip">
        <div>
          <dt>本地版本</dt>
          <dd>{status?.installed ?? "未记录"}</dd>
        </div>
        <div>
          <dt>公开分支版本</dt>
          <dd>{status?.latest ?? "未记录"}</dd>
        </div>
        <div>
          <dt>更新状态</dt>
          <dd>{gameUpdateStatusLabel(status)}</dd>
        </div>
      </dl>
      <p className="console-note">{note ?? gameUpdateCheckNote(status)}</p>
      <div className="console-row-actions">
        <button type="button" className="icon-command" disabled={!canManage || busy !== null} title={canManage ? "向 SteamCMD 查询最新 SCUM 版本号" : "当前账号没有管理权限"} onClick={() => void checkForUpdate()}>
          <RefreshCw size={15} />
          <span>检查更新</span>
        </button>
        <button
          type="button"
          className={updateAvailable ? "primary-command" : "icon-command"}
          disabled={!canManage || !updateAllowed || busy !== null}
          title={updateTitle(canManage, updateAvailable, updateAllowed, instance.state)}
          onClick={() => setConfirmUpdate(true)}
        >
          <Download size={15} />
          <span>更新版本</span>
        </button>
      </div>
      <ConfirmDialog
        open={confirmUpdate}
        title="更新 SCUM 服务端"
        description={`确认更新 ${instance.name}（${instance.id}）？平台会先让插件优雅关闭 SCUM 服务（RCON 通知玩家并等待进程退出），关闭失败则中止更新；SteamCMD 校验更新完成后会自动重新启动服务。`}
        confirmLabel="关闭并更新"
        busy={busy === "update"}
        onCancel={() => setConfirmUpdate(false)}
        onConfirm={() => {
          setConfirmUpdate(false);
          void submitUpdate();
        }}
      />
    </article>
  );
}

function updateTitle(canManage: boolean, updateAvailable: boolean, updateAllowed: boolean, state: ServerInstanceResponse["state"]): string {
  if (!canManage) {
    return "当前账号没有管理权限";
  }
  if (!updateAvailable) {
    return "先检查更新；检测到新版本后该按钮会点亮";
  }
  if (!updateAllowed) {
    return `当前状态 ${state} 不能执行游戏更新`;
  }
  return "优雅关闭 SCUM 服务后执行 SteamCMD 更新，成功后自动启动";
}

async function waitForDependencyCheckJob(jobId: string): Promise<JobResponse | null> {
  for (let attempt = 0; attempt < dependencyCheckPollAttempts; attempt += 1) {
    const current = await platformApiClient.getJob(jobId);
    if (current.state === "succeeded" || current.state === "failed" || current.state === "cancelled") {
      return current;
    }
    await new Promise((resolve) => window.setTimeout(resolve, dependencyCheckPollMs));
  }
  return null;
}