import {
  Activity,
  AlertTriangle,
  Archive,
  ArrowRight,
  Box,
  Braces,
  Check,
  CircleStop,
  CloudUpload,
  Cpu,
  Download,
  FileCode2,
  Package,
  Play,
  RadioTower,
  RefreshCw,
  RotateCcw,
  Search,
  Server,
  SquareTerminal,
  X,
  Zap,
} from "lucide-react";
import { ReactNode, useState } from "react";
import {
  BackendCapability,
  BackendRuntime,
  BackendWitPackage,
  witPackageDownloadUrl,
} from "../api";
import {
  EventTone,
  RuntimeEvent,
  Service,
  ServiceStatus,
  STATUS_META,
  formatDuration,
  serviceKey,
} from "../console-model";

function PageHeading({
  eyebrow,
  title,
  description,
  actions,
}: {
  eyebrow: string;
  title: string;
  description: string;
  actions?: ReactNode;
}) {
  return (
    <div className="page-heading">
      <div>
        <span className="eyebrow">{eyebrow}</span>
        <h1>{title}</h1>
        <p>{description}</p>
      </div>
      {actions && <div className="heading-actions">{actions}</div>}
    </div>
  );
}

export function Overview({
  services,
  filteredServices,
  events,
  running,
  faulted,
  totalCalls,
  deploymentCount,
  runtime,
  selectedService,
  onSelect,
  onDeploy,
  onInvoke,
  onStatus,
  onActivate,
  onViewAll,
  onRefresh,
  onRuntimeAction,
  runtimeAction,
  deploymentAction,
}: {
  services: Service[];
  filteredServices: Service[];
  events: RuntimeEvent[];
  running: number;
  faulted: number;
  totalCalls: number;
  deploymentCount: number;
  runtime: BackendRuntime | null;
  selectedService: Service | null;
  onSelect: (service: Service) => void;
  onDeploy: () => void;
  onInvoke: (service: Service) => void;
  onStatus: (service: Service, status: ServiceStatus) => void;
  onActivate: (service: Service) => void;
  onViewAll: () => void;
  onRefresh: () => void;
  onRuntimeAction: (action: "start" | "stop" | "restart") => void;
  runtimeAction: "start" | "stop" | "restart" | null;
  deploymentAction: string | null;
}) {
  const errorCount = services.reduce((sum, service) => sum + service.errors, 0);
  const latencies = services
    .map((service) => service.latencyMs)
    .filter((latency): latency is number => latency !== null);
  const latestLatency = latencies.length ? Math.max(...latencies) : null;

  return (
    <>
      <PageHeading
        eyebrow="LOCAL RUNTIME"
        title="运行概览"
        description={`${services.length} 个已注册版本，${running} 个 Actor 正在运行。`}
        actions={
          <>
            <button
              className="icon-button"
              type="button"
              aria-label="刷新"
              title="刷新"
              onClick={onRefresh}
            >
              <RefreshCw size={17} />
            </button>
            <button className="primary-button" type="button" onClick={onDeploy}>
              <CloudUpload size={17} />
              注册组件
            </button>
          </>
        }
      />

      <section className="metric-grid" aria-label="关键指标">
        <Metric
          icon={<Package size={18} />}
          label="服务版本"
          value={services.length.toString()}
          note={`${deploymentCount} 个对外服务`}
          tone="cyan"
        />
        <Metric
          icon={<Activity size={18} />}
          label="运行实例"
          value={running.toString()}
          note={`${services.length - running} 个未运行`}
          tone="green"
        />
        <Metric
          icon={<Zap size={18} />}
          label="累计调用"
          value={totalCalls.toLocaleString("zh-CN")}
          note="持久化统计"
          tone="amber"
        />
        <Metric
          icon={<AlertTriangle size={18} />}
          label="异常"
          value={(faulted + errorCount).toString()}
          note={faulted + errorCount ? "需要检查" : "无异常"}
          tone="coral"
        />
      </section>

      <section className="runtime-band">
        <div className="runtime-band-title">
          <div className="runtime-symbol">
            <Cpu size={18} />
          </div>
          <div>
            <strong>Wasmeld Runtime</strong>
            <span>
              {runtime?.status === "running"
                ? "Engine 已启用 fuel 与 epoch interruption"
                : "Engine 与所有 Actor 已释放"}
            </span>
          </div>
          <div className="runtime-controls" aria-label="Runtime 生命周期">
            {runtime?.status === "stopped" ? (
              <button
                className="icon-button"
                type="button"
                aria-label="启动 Runtime"
                title="启动 Runtime"
                disabled={runtimeAction !== null}
                onClick={() => onRuntimeAction("start")}
              >
                <Play size={15} />
              </button>
            ) : (
              <>
                <button
                  className="icon-button"
                  type="button"
                  aria-label="重启 Runtime"
                  title="重启 Runtime"
                  disabled={runtimeAction !== null || !runtime}
                  onClick={() => onRuntimeAction("restart")}
                >
                  <RotateCcw size={15} />
                </button>
                <button
                  className="icon-button runtime-stop-button"
                  type="button"
                  aria-label="停止 Runtime"
                  title="停止 Runtime"
                  disabled={runtimeAction !== null || !runtime}
                  onClick={() => onRuntimeAction("stop")}
                >
                  <CircleStop size={15} />
                </button>
              </>
            )}
          </div>
        </div>
        <RuntimeStat
          label="已加载版本"
          value={(runtime?.registered_services ?? 0).toString()}
          detail={`${runtime?.managed_services ?? services.length} 个受管制品`}
        />
        <RuntimeStat
          label="活跃 Store"
          value={(runtime?.running_services ?? running).toString()}
          detail="串行 Actor"
        />
        <RuntimeStat
          label="最近延迟"
          value={latestLatency === null ? "—" : `${latestLatency} ms`}
          detail="各服务最近调用"
        />
        <RuntimeStat
          label="运行时间"
          value={runtime?.status === "running" ? formatDuration(runtime.uptime_ms) : "—"}
          detail="当前 Runtime 实例"
        />
      </section>

      <div className="overview-grid">
        <section className="panel service-panel">
          <div className="panel-header">
            <div>
              <h2>服务状态</h2>
              <p>已注册版本及当前 Actor 状态</p>
            </div>
            <button className="text-button" type="button" onClick={onViewAll}>
              查看全部
              <ArrowRight size={15} />
            </button>
          </div>
          <ServiceTable
            services={filteredServices.slice(0, 5)}
            selectedKey={selectedService ? serviceKey(selectedService) : ""}
            onSelect={onSelect}
            onInvoke={onInvoke}
            onStatus={onStatus}
            onActivate={onActivate}
            canActivate={runtime?.status === "running"}
            deploymentAction={deploymentAction}
            compact
          />
        </section>

        <aside className="panel event-panel">
          <div className="panel-header">
            <div>
              <h2>实时事件</h2>
              <p>Runtime 生命周期与调用结果</p>
            </div>
            <span className="live-label">
              <span />
              LIVE
            </span>
          </div>
          <EventList events={events.slice(0, 5)} />
        </aside>
      </div>

      {selectedService && (
        <section className="detail-strip">
          <div className="detail-identity">
            <div className="artifact-icon">
              <FileCode2 size={20} />
            </div>
            <div>
              <span>当前选中</span>
              <strong>
                {selectedService.id}
                <small>@{selectedService.revision}</small>
              </strong>
            </div>
          </div>
          <DetailValue label="内存上限" value={`${selectedService.memoryMb} MB`} />
          <DetailValue label="Fuel / 调用" value={selectedService.fuel} />
          <DetailValue label="Deadline" value={`${selectedService.deadlineMs} ms`} />
          <DetailValue label="Mailbox" value={selectedService.mailbox.toString()} />
          <div className="detail-actions">
            {!selectedService.active && (
              <button
                className="secondary-button"
                type="button"
                disabled={runtime?.status !== "running" || deploymentAction !== null}
                onClick={() => onActivate(selectedService)}
              >
                <RadioTower size={16} />
                设为对外
              </button>
            )}
            <button
              className="secondary-button"
              type="button"
              disabled={selectedService.status !== "running"}
              onClick={() => onInvoke(selectedService)}
            >
              <SquareTerminal size={16} />
              测试调用
            </button>
          </div>
        </section>
      )}
    </>
  );
}

function Metric({
  icon,
  label,
  value,
  note,
  tone,
}: {
  icon: ReactNode;
  label: string;
  value: string;
  note: string;
  tone: string;
}) {
  return (
    <article className="metric">
      <div className={`metric-icon metric-${tone}`}>{icon}</div>
      <div className="metric-copy">
        <span>{label}</span>
        <strong>{value}</strong>
      </div>
      <small>{note}</small>
    </article>
  );
}

function RuntimeStat({ label, value, detail }: { label: string; value: string; detail: string }) {
  return (
    <div className="runtime-stat">
      <span>{label}</span>
      <strong>{value}</strong>
      <small>{detail}</small>
    </div>
  );
}

function DetailValue({ label, value }: { label: string; value: string }) {
  return (
    <div className="detail-value">
      <span>{label}</span>
      <strong>{value}</strong>
    </div>
  );
}

function StatusBadge({ status }: { status: ServiceStatus }) {
  const meta = STATUS_META[status];
  return (
    <span className={`status-badge ${meta.className}`}>
      <span />
      {meta.label}
    </span>
  );
}

function CapabilitySummary({ capabilities }: { capabilities: BackendCapability[] }) {
  if (capabilities.length === 0) {
    return <span className="capability-empty">无</span>;
  }

  const [first, ...remaining] = capabilities;
  return (
    <span
      className="capability-summary"
      title={capabilities.map((capability) => capability.interface).join("\n")}
    >
      <Braces size={12} />
      <span>
        {first.package}/{first.name} @{first.version}
      </span>
      {remaining.length > 0 && <small>+{remaining.length}</small>}
    </span>
  );
}

function ServiceTable({
  services,
  selectedKey,
  onSelect,
  onInvoke,
  onStatus,
  onActivate,
  canActivate,
  deploymentAction,
  compact = false,
}: {
  services: Service[];
  selectedKey?: string;
  onSelect: (service: Service) => void;
  onInvoke: (service: Service) => void;
  onStatus: (service: Service, status: ServiceStatus) => void;
  onActivate: (service: Service) => void;
  canActivate: boolean;
  deploymentAction: string | null;
  compact?: boolean;
}) {
  if (services.length === 0) {
    return (
      <div className="empty-state">
        <Search size={22} />
        <strong>没有匹配的服务</strong>
        <span>调整搜索关键词或状态筛选。</span>
      </div>
    );
  }

  return (
    <div className="table-scroll">
      <table className={`data-table ${compact ? "service-table-compact" : "service-table-full"}`}>
        <thead>
          <tr>
            <th>服务</th>
            <th>状态</th>
            {!compact && <th>制品</th>}
            {!compact && <th>Host 能力</th>}
            <th>调用</th>
            <th>延迟</th>
            <th>
              <span className="sr-only">操作</span>
            </th>
          </tr>
        </thead>
        <tbody>
          {services.map((service) => (
            <tr
              key={`${service.id}-${service.revision}`}
              className={selectedKey === serviceKey(service) ? "selected" : ""}
            >
              <td>
                <button
                  className="service-cell service-select"
                  type="button"
                  aria-label={`选择 ${service.id}@${service.revision}`}
                  onClick={() => onSelect(service)}
                >
                  <span className="service-glyph">
                    <Box size={16} />
                  </span>
                  <span>
                    <span className="service-title">
                      <strong>{service.id}</strong>
                      {service.active && (
                        <span className="active-deployment-badge">
                          <RadioTower size={10} />
                          对外
                        </span>
                      )}
                    </span>
                    <small>
                      {service.revision} · {service.description}
                    </small>
                  </span>
                </button>
              </td>
              <td>
                <StatusBadge status={service.status} />
              </td>
              {!compact && <td className="artifact-cell">{service.artifact}</td>}
              {!compact && (
                <td>
                  <CapabilitySummary capabilities={service.capabilities} />
                </td>
              )}
              <td className="numeric-cell">{service.calls.toLocaleString("zh-CN")}</td>
              <td className="numeric-cell">
                {service.latencyMs ? `${service.latencyMs} ms` : "—"}
              </td>
              <td>
                <div className="row-actions">
                  <button
                    className={service.active ? "active-deployment-button" : ""}
                    type="button"
                    aria-label={
                      service.active
                        ? `${service.id}@${service.revision} 是当前对外版本`
                        : `将 ${service.id}@${service.revision} 设为对外版本`
                    }
                    title={
                      service.active
                        ? "当前对外版本"
                        : canActivate
                          ? "设为对外版本"
                          : "请先启动 Runtime"
                    }
                    disabled={service.active || !canActivate || deploymentAction !== null}
                    onClick={() => onActivate(service)}
                  >
                    {deploymentAction === serviceKey(service) ? (
                      <RefreshCw className="spin" size={15} />
                    ) : (
                      <RadioTower size={15} />
                    )}
                  </button>
                  {service.status === "running" ? (
                    <>
                      <button
                        type="button"
                        aria-label={`调用 ${service.id}`}
                        title="测试调用"
                        onClick={() => onInvoke(service)}
                      >
                        <SquareTerminal size={15} />
                      </button>
                      <button
                        type="button"
                        aria-label={`重启 ${service.id}`}
                        title="重启"
                        onClick={() => onStatus(service, "running")}
                      >
                        <RotateCcw size={15} />
                      </button>
                      <button
                        type="button"
                        aria-label={`停止 ${service.id}`}
                        title="停止"
                        onClick={() => onStatus(service, "stopped")}
                      >
                        <CircleStop size={15} />
                      </button>
                    </>
                  ) : (
                    <button
                      type="button"
                      aria-label={`启动 ${service.id}`}
                      title="启动"
                      onClick={() => onStatus(service, "running")}
                    >
                      <Play size={15} />
                    </button>
                  )}
                </div>
              </td>
            </tr>
          ))}
        </tbody>
      </table>
    </div>
  );
}

function EventList({ events }: { events: RuntimeEvent[] }) {
  const icons: Record<EventTone, ReactNode> = {
    success: <Check size={14} />,
    warning: <AlertTriangle size={14} />,
    danger: <X size={14} />,
    neutral: <CircleStop size={14} />,
  };

  return (
    <div className="event-list">
      {events.map((event) => (
        <div className="event-row" key={event.id}>
          <span className={`event-icon event-${event.tone}`}>{icons[event.tone]}</span>
          <div>
            <strong>{event.title}</strong>
            <span>{event.detail}</span>
          </div>
          <time>{event.time}</time>
        </div>
      ))}
    </div>
  );
}

export function ServicesView({
  services,
  statusFilter,
  onFilter,
  onDeploy,
  onInvoke,
  onSelect,
  onStatus,
  onActivate,
  canActivate,
  deploymentAction,
}: {
  services: Service[];
  statusFilter: "all" | ServiceStatus;
  onFilter: (status: "all" | ServiceStatus) => void;
  onDeploy: () => void;
  onInvoke: (service: Service) => void;
  onSelect: (service: Service) => void;
  onStatus: (service: Service, status: ServiceStatus) => void;
  onActivate: (service: Service) => void;
  canActivate: boolean;
  deploymentAction: string | null;
}) {
  return (
    <>
      <PageHeading
        eyebrow="REGISTRY"
        title="服务版本"
        description="管理不可变 Wasm Component 制品及当前对外版本。"
        actions={
          <button className="primary-button" type="button" onClick={onDeploy}>
            <CloudUpload size={17} />
            注册组件
          </button>
        }
      />
      <section className="panel full-panel">
        <div className="filterbar">
          <div className="segmented" aria-label="状态筛选">
            {[
              ["all", "全部"],
              ["running", "运行中"],
              ["stopped", "已停止"],
              ["faulted", "故障"],
            ].map(([value, label]) => (
              <button
                type="button"
                key={value}
                className={statusFilter === value ? "active" : ""}
                onClick={() => onFilter(value as "all" | ServiceStatus)}
              >
                {label}
              </button>
            ))}
          </div>
          <span className="result-count">{services.length} 个版本</span>
        </div>
        <ServiceTable
          services={services}
          onSelect={onSelect}
          onInvoke={onInvoke}
          onStatus={onStatus}
          onActivate={onActivate}
          canActivate={canActivate}
          deploymentAction={deploymentAction}
        />
      </section>
    </>
  );
}

export function WitPackagesView({
  apiBase,
  packages,
  onPublish,
}: {
  apiBase: string;
  packages: BackendWitPackage[];
  onPublish: () => void;
}) {
  function downloadPackage(packageMetadata: BackendWitPackage) {
    const anchor = document.createElement("a");
    anchor.href = witPackageDownloadUrl(apiBase, packageMetadata);
    anchor.download = `${packageMetadata.name.replace(":", "-")}-${packageMetadata.version}.wasm`;
    document.body.append(anchor);
    anchor.click();
    anchor.remove();
  }

  return (
    <>
      <PageHeading
        eyebrow="WIT REGISTRY"
        title="WIT 包"
        description="管理组件开发所依赖的不可变、版本化 WIT Package。"
        actions={
          <button className="primary-button" type="button" onClick={onPublish}>
            <CloudUpload size={17} />
            发布 WIT 包
          </button>
        }
      />
      <section className="panel full-panel">
        <div className="filterbar">
          <span className="registry-note">发布后不可覆盖；包名、版本与依赖由制品自动解析。</span>
          <span className="result-count">{packages.length} 个包版本</span>
        </div>
        {packages.length === 0 ? (
          <div className="empty-state">
            <FileCode2 size={22} />
            <strong>没有匹配的 WIT 包</strong>
            <span>发布二进制 WIT Package，或调整搜索关键词。</span>
          </div>
        ) : (
          <div className="table-scroll">
            <table className="data-table wit-package-table">
              <thead>
                <tr>
                  <th>Package</th>
                  <th>依赖</th>
                  <th>SHA-256</th>
                  <th>
                    <span className="sr-only">操作</span>
                  </th>
                </tr>
              </thead>
              <tbody>
                {packages.map((packageMetadata) => {
                  const dependencies = packageMetadata.dependencies
                    .map((dependency) => `${dependency.name}@${dependency.version}`)
                    .join(", ");
                  return (
                    <tr key={`${packageMetadata.name}@${packageMetadata.version}`}>
                      <td aria-label={`${packageMetadata.name}@${packageMetadata.version}`}>
                        <div className="service-cell">
                          <span className="service-glyph">
                            <FileCode2 size={16} />
                          </span>
                          <span>
                            <strong>{packageMetadata.name}</strong>
                            <small>{packageMetadata.version}</small>
                          </span>
                        </div>
                      </td>
                      <td className="artifact-cell" title={dependencies || "无直接依赖"}>
                        {dependencies || "无直接依赖"}
                      </td>
                      <td className="artifact-cell" title={packageMetadata.sha256}>
                        {packageMetadata.sha256}
                      </td>
                      <td>
                        <div className="row-actions">
                          <button
                            type="button"
                            title="下载 WIT 包"
                            aria-label={`下载 ${packageMetadata.name}@${packageMetadata.version}`}
                            onClick={() => downloadPackage(packageMetadata)}
                          >
                            <Download size={15} />
                          </button>
                        </div>
                      </td>
                    </tr>
                  );
                })}
              </tbody>
            </table>
          </div>
        )}
      </section>
    </>
  );
}

export function InstancesView({
  services,
  onInvoke,
  onStatus,
  onRefresh,
}: {
  services: Service[];
  onInvoke: (service: Service) => void;
  onStatus: (service: Service, status: ServiceStatus) => void;
  onRefresh: () => void;
}) {
  const instances = services.filter(
    (service) => service.status === "running" || service.status === "faulted",
  );

  return (
    <>
      <PageHeading
        eyebrow="ACTORS"
        title="运行实例"
        description={`${instances.length} 个 Actor 保持独立 Store 与 Instance。`}
        actions={
          <button
            className="icon-button"
            type="button"
            title="刷新"
            aria-label="刷新"
            onClick={onRefresh}
          >
            <RefreshCw size={17} />
          </button>
        }
      />
      <section className="instance-list">
        {instances.length === 0 ? (
          <output className="instance-placeholder">
            <div className="instance-placeholder-icon">
              <Cpu size={22} />
            </div>
            <strong>暂无运行实例</strong>
            <span>0 ACTIVE ACTORS</span>
          </output>
        ) : (
          instances.map((service) => (
            <article className="instance-row" key={service.id}>
              <div className="instance-main">
                <span className={`instance-indicator ${service.status}`} />
                <div className="artifact-icon">
                  <Cpu size={19} />
                </div>
                <div>
                  <strong>
                    {service.id}@{service.revision}
                  </strong>
                  <span>actor/{service.id}-01</span>
                </div>
              </div>
              <DetailValue
                label="Store 内存"
                value={
                  service.status === "running"
                    ? `${Math.round(service.memoryMb * 0.42)} MB`
                    : "已释放"
                }
              />
              <DetailValue label="调用总数" value={service.calls.toLocaleString("zh-CN")} />
              <DetailValue
                label="最近延迟"
                value={service.latencyMs ? `${service.latencyMs} ms` : "—"}
              />
              <div className="instance-status">
                <StatusBadge status={service.status} />
                <span>{service.updatedAt}</span>
              </div>
              <div className="row-actions">
                <button
                  type="button"
                  title="测试调用"
                  aria-label={`调用 ${service.id}`}
                  disabled={service.status !== "running"}
                  onClick={() => onInvoke(service)}
                >
                  <SquareTerminal size={16} />
                </button>
                <button
                  type="button"
                  title="重启"
                  aria-label={`重启 ${service.id}`}
                  onClick={() => onStatus(service, "running")}
                >
                  <RotateCcw size={16} />
                </button>
                <button
                  type="button"
                  title="停止"
                  aria-label={`停止 ${service.id}`}
                  disabled={service.status !== "running"}
                  onClick={() => onStatus(service, "stopped")}
                >
                  <CircleStop size={16} />
                </button>
              </div>
            </article>
          ))
        )}
      </section>
    </>
  );
}

export function ActivityView({
  events,
  services,
}: {
  events: RuntimeEvent[];
  services: Service[];
}) {
  const calls = services.reduce((sum, service) => sum + service.calls, 0);
  const errors = services.reduce((sum, service) => sum + service.errors, 0);
  const latencies = services
    .map((service) => service.latencyMs)
    .filter((latency): latency is number => latency !== null);
  const averageLatency = latencies.length
    ? latencies.reduce((sum, latency) => sum + latency, 0) / latencies.length
    : null;

  function exportEvents() {
    const blob = new Blob([JSON.stringify(events, null, 2)], {
      type: "application/json",
    });
    const url = URL.createObjectURL(blob);
    const anchor = document.createElement("a");
    anchor.href = url;
    anchor.download = "wasmeld-events.json";
    anchor.click();
    URL.revokeObjectURL(url);
  }

  return (
    <>
      <PageHeading
        eyebrow="EVENT STREAM"
        title="调用记录"
        description="Runtime 生命周期、调用结果与沙箱拒绝记录。"
        actions={
          <button className="secondary-button" type="button" onClick={exportEvents}>
            <Archive size={16} />
            导出记录
          </button>
        }
      />
      <section className="panel full-panel">
        <div className="activity-summary">
          <div>
            <span>时间范围</span>
            <strong>当前进程</strong>
          </div>
          <div>
            <span>成功率</span>
            <strong>{calls ? `${(((calls - errors) / calls) * 100).toFixed(2)}%` : "—"}</strong>
          </div>
          <div>
            <span>平均延迟</span>
            <strong>{averageLatency === null ? "—" : `${averageLatency.toFixed(1)} ms`}</strong>
          </div>
          <div>
            <span>记录数</span>
            <strong>{events.length}</strong>
          </div>
        </div>
        <EventList events={events} />
      </section>
    </>
  );
}

export function SettingsView({
  endpoint,
  onSaveEndpoint,
}: {
  endpoint: string;
  onSaveEndpoint: (value: string) => void;
}) {
  const [value, setValue] = useState(endpoint);

  return (
    <>
      <PageHeading
        eyebrow="CONFIGURATION"
        title="运行设置"
        description="本地控制台连接与 Runtime 默认参数。"
      />
      <form
        className="settings-form"
        onSubmit={(event) => {
          event.preventDefault();
          onSaveEndpoint(value);
        }}
      >
        <section className="settings-section">
          <div className="settings-heading">
            <Server size={18} />
            <div>
              <h2>控制端连接</h2>
              <p>管理 API 的本地访问地址。</p>
            </div>
          </div>
          <div className="form-field wide-field">
            <label htmlFor="endpoint">API 地址</label>
            <input id="endpoint" value={value} onChange={(event) => setValue(event.target.value)} />
            <span>连接状态将在顶部工具栏显示。</span>
          </div>
        </section>

        <div className="form-footer">
          <button className="primary-button" type="submit">
            保存设置
          </button>
        </div>
      </form>
    </>
  );
}