import { Pause, Play, ShieldAlert } from "lucide-react";
import type { ReactNode } from "react";
import { toast } from "sonner";
import { useUpdateSettings } from "~/api/settings.ts";
import { Switch } from "~/components/ui/switch.tsx";
import { errorMessage } from "~/lib/api.ts";
import { cn } from "~/lib/utils.ts";
import { num } from "./resource-section.tsx";
import { SettingsBlock } from "./settings-block.tsx";
import { type CardSpec, n, SettingsCard, SettingsGate } from "./settings-card.tsx";

// 自动化分区:总开关、只读对账、缓存水位、每日下载预算、保留天数

const GiB = 1024 ** 3;

const CACHE_CARD: CardSpec = {
  anchor: "cache",
  title: "缓存水位",
  description: "缓存卷使用率到硬阈值时停止新增下载并暂停纳管任务；降到恢复水位以下只恢复因阈值暂停的任务。",
  fields: [
    { name: "cache.hardThresholdPercent", label: "硬阈值(%)", kind: "number" },
    { name: "cache.resumePercent", label: "恢复水位(%)", kind: "number", hint: "低于硬阈值" },
    { name: "cache.cleanupTargetPercent", label: "清理目标(%)", kind: "number", hint: "不高于恢复水位" },
    { name: "cache.checkIntervalSec", label: "检查间隔（秒）", kind: "number", hint: "10–3600" },
  ],
  fromSettings: (s) => ({
    "cache.hardThresholdPercent": n(s.cache.hardThresholdPercent),
    "cache.resumePercent": n(s.cache.resumePercent),
    "cache.cleanupTargetPercent": n(s.cache.cleanupTargetPercent),
    "cache.checkIntervalSec": n(s.cache.checkIntervalSec),
  }),
  toPatch: (v) => ({
    cache: {
      hardThresholdPercent: num(v["cache.hardThresholdPercent"]),
      resumePercent: num(v["cache.resumePercent"]),
      cleanupTargetPercent: num(v["cache.cleanupTargetPercent"]),
      checkIntervalSec: num(v["cache.checkIntervalSec"]),
    },
  }),
};

const BUDGET_CARD: CardSpec = {
  anchor: "budget",
  title: "每日预算",
  description: "任一项到上限后不再建新的下载计划；前两项按自然日计。",
  fields: [
    { name: "budget.maxNewTitlesPerDay", label: "每日新作品数", kind: "number" },
    { name: "budget.maxDownloadGiBPerDay", label: "每日下载量(GiB)", kind: "number" },
    { name: "budget.maxConcurrentDownloads", label: "最大并发下载", kind: "number", hint: "1–100" },
  ],
  fromSettings: (s) => ({
    "budget.maxNewTitlesPerDay": n(s.budget.maxNewTitlesPerDay),
    "budget.maxDownloadGiBPerDay": n(Math.round((s.budget.maxDownloadBytesPerDay / GiB) * 100) / 100),
    "budget.maxConcurrentDownloads": n(s.budget.maxConcurrentDownloads),
  }),
  toPatch: (v) => {
    const gib = num(v["budget.maxDownloadGiBPerDay"]);
    return {
      budget: {
        maxNewTitlesPerDay: num(v["budget.maxNewTitlesPerDay"]),
        maxDownloadBytesPerDay: gib === undefined ? undefined : Math.round(gib * GiB),
        maxConcurrentDownloads: num(v["budget.maxConcurrentDownloads"]),
      },
    };
  },
};

const RETENTION_CARD: CardSpec = {
  anchor: "retention",
  title: "保留",
  fields: [
    {
      name: "retention.seedRetentionDays",
      label: "源文件保留天数",
      kind: "number",
      hint: "复制入库后下载源在缓存里至少留这么久；0–365",
    },
    { name: "retention.logRetentionDays", label: "日志保留天数", kind: "number", hint: "观察与日志类数据" },
  ],
  fromSettings: (s) => ({
    "retention.seedRetentionDays": n(s.retention.seedRetentionDays),
    "retention.logRetentionDays": n(s.retention.logRetentionDays),
  }),
  toPatch: (v) => ({
    retention: {
      seedRetentionDays: num(v["retention.seedRetentionDays"]),
      logRetentionDays: num(v["retention.logRetentionDays"]),
    },
  }),
};

function ToggleRow({
  id,
  icon,
  title,
  description,
  checked,
  onChange,
  disabled,
  tone,
}: {
  id: string;
  icon: ReactNode;
  title: string;
  description: string;
  checked: boolean;
  onChange: (v: boolean) => void;
  disabled: boolean;
  tone: "success" | "warning";
}) {
  return (
    <div className="flex items-start gap-4 py-4 first:pt-0 last:pb-0">
      <span
        className={cn(
          "grid h-9 w-9 shrink-0 place-items-center rounded-full",
          tone === "success" ? "bg-success/10 text-success" : "bg-warning/10 text-warning",
        )}
      >
        {icon}
      </span>
      <span className="min-w-0 flex-1">
        <label htmlFor={id} className="block cursor-pointer text-sm font-medium text-foreground">
          {title}
        </label>
        <span className="block text-caption text-muted-foreground">{description}</span>
      </span>
      <Switch id={id} checked={checked} onCheckedChange={onChange} disabled={disabled} aria-label={title} />
    </div>
  );
}

function Switches() {
  const update = useUpdateSettings();
  const set = async (patch: { enabled?: boolean; readOnlyReconcile?: boolean }, msg: string) => {
    try {
      await update.mutateAsync({ automation: patch });
      toast.success(msg);
    } catch (err) {
      toast.error(errorMessage(err, "切换失败"));
    }
  };
  return (
    <SettingsGate>
      {(s) => (
        <SettingsBlock section="automation" anchor="switches" title="开关" description="切换后立即生效。">
          <div className="divide-y divide-border/60">
            <ToggleRow
              id="tg-automation"
              icon={s.automation.enabled ? <Play className="h-4 w-4" /> : <Pause className="h-4 w-4" />}
              tone={s.automation.enabled ? "success" : "warning"}
              title={`自动化总开关 · ${s.automation.enabled ? "运行中" : "已暂停"}`}
              description="关闭后自动收录、下载、整理全部停止；查询与手动操作不受影响。"
              checked={s.automation.enabled}
              disabled={update.isPending}
              onChange={(v) => set({ enabled: v }, v ? "自动化已恢复" : "自动化已暂停")}
            />
            <ToggleRow
              id="tg-readonly"
              icon={<ShieldAlert className="h-4 w-4" />}
              tone={s.automation.readOnlyReconcile ? "warning" : "success"}
              title={`只读对账 · ${s.automation.readOnlyReconcile ? "开启" : "关闭"}`}
              description="从备份恢复后先开启：只核对库存与路径，不做自动写入。核对完再关闭。"
              checked={s.automation.readOnlyReconcile}
              disabled={update.isPending}
              onChange={(v) => set({ readOnlyReconcile: v }, v ? "已开启只读对账" : "已关闭只读对账")}
            />
          </div>
        </SettingsBlock>
      )}
    </SettingsGate>
  );
}

export function AutomationSection() {
  return (
    <div className="grid gap-8">
      <Switches />
      <SettingsGate>
        {(s) => (
          <>
            <SettingsCard section="automation" spec={CACHE_CARD} settings={s} />
            <SettingsCard section="automation" spec={BUDGET_CARD} settings={s} />
            <SettingsCard section="automation" spec={RETENTION_CARD} settings={s} />
          </>
        )}
      </SettingsGate>
    </div>
  );
}