import { ChevronDown, Pause, Play, ShieldAlert } from "lucide-react";
import { type ReactNode, useEffect, useState } from "react";
import { useLocation } from "react-router";
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 { type FormValues, num } from "./resource-section.tsx";
import { anchorId, 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、后台任务并发(WK-1)、存储预算与保留(CACHE-2)

const GiB = 1024 ** 3;

const CACHE_CARD: CardSpec = {
  anchor: "cache",
  title: "下载盘",
  description: "下载盘用量到暂停线时不再新增下载，并暂停本工具的下载任务；降到恢复线以下只恢复因此暂停的任务。",
  fields: [
    { name: "cache.hardThresholdPercent", label: "暂停线(%)", kind: "number" },
    { name: "cache.resumePercent", label: "恢复线(%)", kind: "number", hint: "低于暂停线" },
    { name: "cache.cleanupTargetPercent", label: "清理目标(%)", kind: "number", hint: "不高于恢复线" },
    { 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开始新的下载；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" },
  ],
  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"]),
    },
  }),
};

// CACHE-2:存储预算、流水保留期、缓存有效期(settings.storage,docs/runbook/storage.md)
const gbField = (k: string, label: string, hint?: string) => ({
  name: `storage.budgets.${k}`,
  label,
  kind: "number" as const,
  hint,
});
const dayField = (group: "retentionDays" | "cacheTtl", k: string, label: string, hint?: string) => ({
  name: `storage.${group}.${k}`,
  label,
  kind: "number" as const,
  hint,
});
const pick = (v: FormValues, prefix: string, keys: readonly string[]) =>
  Object.fromEntries(keys.map((k) => [k, num(v[`${prefix}.${k}`])]));

// WK-1:io worker 三条道的并发(settings.automation.workerLanes,docs/runbook/dev.md「IO Worker 分道」)
const LANE_KEYS = ["file", "network", "maintenance"] as const;
const WORKER_LANES_CARD: CardSpec = {
  anchor: "worker-lanes",
  title: "后台任务并发",
  description:
    "后台任务分三条道各自排队，互不占用。保存后几秒内生效，不用重启；服务器上设置了对应的环境变量时以环境变量为准。",
  fields: [
    { name: "automation.workerLanes.file", label: "文件道", kind: "number", hint: "整理、硬链接、移动、校验；1–16" },
    {
      name: "automation.workerLanes.network",
      label: "网络道",
      kind: "number",
      hint: "站点、RSS、TMDB、下载器、搜索；单站限流另计；1–16",
    },
    {
      name: "automation.workerLanes.maintenance",
      label: "维护道",
      kind: "number",
      hint: "清理、回填、对账；前两道有活时让路；1–16",
    },
  ],
  fromSettings: (s) =>
    Object.fromEntries(LANE_KEYS.map((k) => [`automation.workerLanes.${k}`, n(s.automation.workerLanes[k])])),
  toPatch: (v) => ({ automation: { workerLanes: pick(v, "automation.workerLanes", LANE_KEYS) } }),
};

const BUDGET_KEYS = ["pgDataGb", "pgDataWarnGb", "imagesGb", "backupsGb", "sessionsEvidenceGb"] as const;
const STORAGE_BUDGET_CARD: CardSpec = {
  anchor: "storage",
  title: "存储预算",
  description: "超过预算时健康页告警；图片缓存超出容量按最久未访问删除。单位 GB。",
  fields: [
    gbField("pgDataGb", "数据库预算", "超过为严重"),
    gbField("pgDataWarnGb", "数据库告警线", "不高于数据库预算"),
    gbField("imagesGb", "图片缓存容量"),
    gbField("backupsGb", "备份目录预算"),
    gbField("sessionsEvidenceGb", "智能体会话与截图证据预算"),
  ],
  fromSettings: (s) => Object.fromEntries(BUDGET_KEYS.map((k) => [`storage.budgets.${k}`, n(s.storage.budgets[k])])),
  toPatch: (v) => ({ storage: { budgets: pick(v, "storage.budgets", BUDGET_KEYS) } }),
};

const RETENTION_KEYS = [
  "observation",
  "sseEvent",
  "heartbeatHours",
  "taskRun",
  "agentEvent",
  "audit",
  "capabilityStats",
  "identityPoolArchive",
] as const;
const STORAGE_RETENTION_CARD: CardSpec = {
  anchor: "storage-retention",
  title: "流水数据保留",
  description: "到期由定时清理任务分批删除。单位天，心跳为小时。",
  fields: [
    dayField("retentionDays", "observation", "RSS 抓取记录"),
    dayField("retentionDays", "sseEvent", "实时事件"),
    dayField("retentionDays", "heartbeatHours", "进程心跳（小时）"),
    dayField("retentionDays", "taskRun", "任务运行记录"),
    dayField("retentionDays", "agentEvent", "智能体会话事件", "只删已结束的会话"),
    dayField("retentionDays", "audit", "审计日志", "能力调用审计除外"),
    dayField("retentionDays", "capabilityStats", "能力调用统计"),
    dayField(
      "retentionDays",
      "identityPoolArchive",
      "未识别资源归档",
      "未命中的条目这么久没有新证据就归档，仍可手动指定",
    ),
  ],
  fromSettings: (s) =>
    Object.fromEntries(RETENTION_KEYS.map((k) => [`storage.retentionDays.${k}`, n(s.storage.retentionDays[k])])),
  toPatch: (v) => ({ storage: { retentionDays: pick(v, "storage.retentionDays", RETENTION_KEYS) } }),
};

const TTL_KEYS = ["tmdbSearchDays", "tmdbDetailDays", "tmdbMissDays", "siteDetailDays", "webSearchDays"] as const;
const STORAGE_TTL_CARD: CardSpec = {
  anchor: "storage-ttl",
  title: "缓存有效期",
  description: "单位天。追踪中的作品命中 TMDB 详情缓存时自动续期。",
  fields: [
    dayField("cacheTtl", "tmdbSearchDays", "TMDB 搜索与识别结果"),
    dayField("cacheTtl", "tmdbDetailDays", "TMDB 详情"),
    dayField("cacheTtl", "tmdbMissDays", "TMDB 空结果", "搜索无结果、未识别时的负缓存"),
    dayField("cacheTtl", "siteDetailDays", "站点详情页内容"),
    dayField("cacheTtl", "webSearchDays", "网页搜索结果"),
  ],
  fromSettings: (s) => Object.fromEntries(TTL_KEYS.map((k) => [`storage.cacheTtl.${k}`, n(s.storage.cacheTtl[k])])),
  toPatch: (v) => ({ storage: { cacheTtl: pick(v, "storage.cacheTtl", TTL_KEYS) } }),
};

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>
  );
}

/** 高级:只读对账、后台任务并发、存储预算、流水保留、缓存有效期;默认收起,从 #automation/advanced 进来时展开 */
function Advanced({ children }: { children: ReactNode }) {
  const location = useLocation();
  const [open, setOpen] = useState(() => location.hash.endsWith("/advanced"));
  useEffect(() => {
    if (location.hash.endsWith("/advanced")) setOpen(true);
  }, [location.hash]);
  return (
    <section id={anchorId("automation", "advanced")} className="scroll-mt-20">
      <button
        type="button"
        aria-expanded={open}
        onClick={() => setOpen((v) => !v)}
        className="inline-flex items-center gap-1.5 text-lead font-semibold text-foreground"
      >
        高级
        <ChevronDown
          className={cn("size-4 text-muted-foreground transition-transform duration-base", open && "rotate-180")}
        />
      </button>
      <p className="mt-1 text-caption text-muted-foreground">
        只读对账、后台任务并发、存储预算、数据保留和缓存有效期。一般不用改。
      </p>
      {open ? <div className="mt-6 grid grid-cols-1 gap-8">{children}</div> : null}
    </section>
  );
}

function ReadOnlySwitch() {
  const update = useUpdateSettings();
  return (
    <SettingsGate>
      {(s) => (
        <SettingsBlock section="automation" anchor="readonly" title="只读对账">
          <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) =>
              update.mutateAsync({ automation: { readOnlyReconcile: v } }).then(
                () => toast.success(v ? "已开启只读对账" : "已关闭只读对账"),
                (err) => toast.error(errorMessage(err, "切换失败")),
              )
            }
          />
        </SettingsBlock>
      )}
    </SettingsGate>
  );
}

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")}
            />
          </div>
        </SettingsBlock>
      )}
    </SettingsGate>
  );
}

export function AutomationSection() {
  return (
    <div className="grid grid-cols-1 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} />
            <Advanced>
              <ReadOnlySwitch />
              <SettingsCard section="automation" spec={WORKER_LANES_CARD} settings={s} />
              <SettingsCard section="automation" spec={STORAGE_BUDGET_CARD} settings={s} />
              <SettingsCard section="automation" spec={STORAGE_RETENTION_CARD} settings={s} />
              <SettingsCard section="automation" spec={STORAGE_TTL_CARD} settings={s} />
            </Advanced>
          </>
        )}
      </SettingsGate>
    </div>
  );
}