import { FileJson, Pencil, Plus, Power, RefreshCw, Sparkles } from "lucide-react";
import {
  useCallback,
  useEffect,
  useState,
  type FormEvent,
  type ReactNode,
} from "react";
import { toast } from "sonner";
import { adminApi, ApiError } from "../../api/client";
import type {
  AdminHintPack,
  CreateOfficialSkillRequest,
  OfficialSkill,
  OfficialSkillCatalog,
  SkillLocalization,
  UpdateHintPackRequest,
} from "../../api/types";
import {
  Badge,
  Button,
  Card,
  Dialog,
  EmptyState,
  ErrorState,
  Input,
  LoadingState,
  PageHeader,
  Textarea,
} from "../../components/primitives";
import { useAuth } from "../auth/auth-context";
import { HintAutoSection } from "./hint-auto-section";

type HintLocale = "zh" | "en";

export function ContentPage() {
  const { auth } = useAuth();
  const canEdit = auth.status === "authenticated" && auth.role === "SUPER_ADMIN";
  const [catalog, setCatalog] = useState<OfficialSkillCatalog>();
  const [loading, setLoading] = useState(true);
  const [error, setError] = useState<unknown>();
  const [editingSkill, setEditingSkill] = useState<OfficialSkill | "new">();
  const [busySkillId, setBusySkillId] = useState<string>();
  const [locale, setLocale] = useState<HintLocale>("zh");
  const [hintText, setHintText] = useState("");
  const [hintVersion, setHintVersion] = useState(0);
  const [hintLoading, setHintLoading] = useState(true);
  const [hintSaving, setHintSaving] = useState(false);

  const loadSkills = useCallback(async () => {
    setError(undefined);
    try {
      setCatalog(await adminApi.contentSkills());
    } catch (requestError) {
      setError(requestError);
    } finally {
      setLoading(false);
    }
  }, []);

  const loadHint = useCallback(async (nextLocale: HintLocale) => {
    setHintLoading(true);
    try {
      const pack = await adminApi.contentHintPack(nextLocale);
      setHintVersion(pack.version);
      setHintText(formatHintPack(pack));
    } catch (requestError) {
      toast.error(errorMessage(requestError, "Hint pack 加载失败"));
    } finally {
      setHintLoading(false);
    }
  }, []);

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

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

  async function setSkillEnabled(skill: OfficialSkill) {
    setBusySkillId(skill.id);
    try {
      await adminApi.setContentSkillEnabled(skill.id, !skill.enabled);
      toast.success(skill.enabled ? "Skill 已停用" : "Skill 已启用");
      await loadSkills();
    } catch (requestError) {
      toast.error(errorMessage(requestError, "Skill 状态更新失败"));
    } finally {
      setBusySkillId(undefined);
    }
  }

  async function saveHint() {
    let payload: UpdateHintPackRequest;
    try {
      const parsed = JSON.parse(hintText) as Partial<UpdateHintPackRequest>;
      if (!Array.isArray(parsed.cards)) throw new Error("cards 必须是数组");
      payload = {
        generatedAt: optionalString(parsed.generatedAt),
        expiresAt: optionalString(parsed.expiresAt),
        intervalHours:
          parsed.intervalHours === undefined ? undefined : Number(parsed.intervalHours),
        cards: parsed.cards,
      };
    } catch (parseError) {
      toast.error(parseError instanceof Error ? parseError.message : "JSON 格式无效");
      return;
    }
    setHintSaving(true);
    try {
      const saved = await adminApi.updateContentHintPack(locale, payload);
      setHintVersion(saved.version);
      setHintText(formatHintPack(saved));
      toast.success(`${locale} Hint pack 已保存并生效`);
    } catch (requestError) {
      toast.error(errorMessage(requestError, "Hint pack 保存失败"));
    } finally {
      setHintSaving(false);
    }
  }

  if (error) return <ErrorState error={error} retry={() => void loadSkills()} />;
  if (loading || !catalog) return <LoadingState label="加载内容管理" />;

  return (
    <div className="space-y-8">
      <PageHeader
        eyebrow="Official Content"
        title="内容管理"
        description="维护客户端官方 Skill、AI Hint 自动生成与 zh/en 内容。所有变更都会写入审计。"
        actions={
          canEdit ? (
            <Button onClick={() => setEditingSkill("new")}>
              <Plus className="size-4" aria-hidden />
              新增 Skill
            </Button>
          ) : (
            <Badge tone="info">只读访问</Badge>
          )
        }
      />

      <section aria-labelledby="skill-heading" className="space-y-4">
        <div className="flex flex-wrap items-end justify-between gap-3">
          <div>
            <h2 id="skill-heading" className="text-xl font-bold">
              官方 Skill
            </h2>
            <p className="mt-1 text-sm text-muted">
              当前 revision {catalog.revision} · 共 {catalog.skills.length} 项
            </p>
          </div>
          <Button variant="secondary" onClick={() => void loadSkills()}>
            <RefreshCw className="size-4" aria-hidden />
            刷新
          </Button>
        </div>

        {catalog.skills.length === 0 ? (
          <Card>
            <EmptyState title="暂无官方 Skill" description="新增后可单独启用发布。" />
          </Card>
        ) : (
          <div className="grid gap-4 xl:grid-cols-2">
            {catalog.skills.map((skill) => (
              <Card key={skill.id} className="p-5">
                <div className="flex items-start gap-4">
                  <span className="grid size-11 shrink-0 place-items-center rounded-2xl bg-primary-soft text-primary">
                    <Sparkles className="size-5" aria-hidden />
                  </span>
                  <div className="min-w-0 flex-1">
                    <div className="flex flex-wrap items-center gap-2">
                      <h3 className="font-semibold">{skill.localizations["zh-Hans"].name}</h3>
                      <Badge tone={skill.enabled ? "success" : "neutral"}>
                        {skill.enabled ? "已启用" : "已停用"}
                      </Badge>
                      {skill.thinkingEnabled ? <Badge tone="violet">思考</Badge> : null}
                    </div>
                    <p className="mt-1 text-sm text-muted">
                      {skill.localizations["zh-Hans"].summary}
                    </p>
                    <p className="mt-3 break-all font-mono text-[11px] text-muted">
                      {skill.id} · {skill.systemImage} · 排序 {skill.sortOrder}
                    </p>
                    {canEdit ? (
                      <div className="mt-4 flex flex-wrap gap-2">
                        <Button
                          size="sm"
                          variant="secondary"
                          onClick={() => setEditingSkill(skill)}
                        >
                          <Pencil className="size-3.5" aria-hidden />
                          编辑
                        </Button>
                        <Button
                          size="sm"
                          variant={skill.enabled ? "danger" : "primary"}
                          loading={busySkillId === skill.id}
                          onClick={() => void setSkillEnabled(skill)}
                        >
                          <Power className="size-3.5" aria-hidden />
                          {skill.enabled ? "停用" : "启用"}
                        </Button>
                      </div>
                    ) : null}
                  </div>
                </div>
              </Card>
            ))}
          </div>
        )}
      </section>

      <HintAutoSection canEdit={canEdit} />

      <section aria-labelledby="hint-heading" className="space-y-4">
        <div>
          <h2 id="hint-heading" className="text-xl font-bold">
            AI Hint packs
          </h2>
          <p className="mt-1 text-sm text-muted">
            可查看并编辑当前生效的 AIHintPack；保存后立即生效，服务端自动递增 version。
          </p>
        </div>
        <Card className="overflow-hidden">
          <div className="flex flex-wrap items-center gap-2 border-b border-border p-4">
            {(["zh", "en"] as HintLocale[]).map((item) => (
              <Button
                key={item}
                size="sm"
                variant={locale === item ? "primary" : "secondary"}
                onClick={() => setLocale(item)}
                aria-pressed={locale === item}
              >
                {item}
              </Button>
            ))}
            <Badge className="ml-auto" tone="info">
              version {hintVersion}
            </Badge>
          </div>
          <div className="p-4 sm:p-6">
            {hintLoading ? (
              <LoadingState label={`加载 ${locale} Hint pack`} />
            ) : (
              <>
                <label className="block text-sm font-semibold" htmlFor="hint-pack-json">
                  <span className="mb-2 flex items-center gap-2">
                    <FileJson className="size-4 text-primary" aria-hidden />
                    {locale} JSON
                  </span>
                  <Textarea
                    id="hint-pack-json"
                    className="min-h-[420px] font-mono text-xs leading-5"
                    value={hintText}
                    onChange={(event) => setHintText(event.target.value)}
                    readOnly={!canEdit}
                    spellCheck={false}
                  />
                </label>
                {canEdit ? (
                  <div className="mt-4 flex justify-end">
                    <Button loading={hintSaving} onClick={() => void saveHint()}>
                      保存
                    </Button>
                  </div>
                ) : null}
              </>
            )}
          </div>
        </Card>
      </section>

      <SkillDialog
        skill={editingSkill}
        onClose={() => setEditingSkill(undefined)}
        onSaved={async () => {
          setEditingSkill(undefined);
          await loadSkills();
        }}
      />
    </div>
  );
}

function SkillDialog({
  skill,
  onClose,
  onSaved,
}: {
  skill?: OfficialSkill | "new";
  onClose: () => void;
  onSaved: () => Promise<void>;
}) {
  const [form, setForm] = useState<CreateOfficialSkillRequest>(() => emptySkill());
  const [saving, setSaving] = useState(false);

  useEffect(() => {
    setForm(skill && skill !== "new" ? skillToRequest(skill) : emptySkill());
  }, [skill]);

  async function submit(event: FormEvent) {
    event.preventDefault();
    setSaving(true);
    try {
      if (skill === "new") {
        await adminApi.createContentSkill(form);
      } else if (skill) {
        const { id: _id, ...payload } = form;
        await adminApi.updateContentSkill(skill.id, payload);
      }
      toast.success(skill === "new" ? "Skill 已创建（默认停用）" : "Skill 已更新");
      await onSaved();
    } catch (requestError) {
      toast.error(errorMessage(requestError, "Skill 保存失败"));
    } finally {
      setSaving(false);
    }
  }

  return (
    <Dialog
      open={Boolean(skill)}
      onOpenChange={(open) => {
        if (!open) onClose();
      }}
      title={skill === "new" ? "新增官方 Skill" : "编辑官方 Skill"}
      description="ID 创建后不可修改；新 Skill 默认停用，确认内容后再启用。"
      preventClose={saving}
      className="max-w-3xl"
    >
      <form className="space-y-5" onSubmit={(event) => void submit(event)}>
        <div className="grid gap-4 sm:grid-cols-2">
          <Field label="Skill ID">
            <Input
              required
              pattern={"official\\.[a-z0-9._-]+"}
              minLength={10}
              maxLength={100}
              value={form.id}
              disabled={skill !== "new"}
              onChange={(event) => setForm({ ...form, id: event.target.value })}
              placeholder="official.polish"
            />
          </Field>
          <Field label="SF Symbol">
            <Input
              required
              minLength={1}
              maxLength={100}
              value={form.systemImage}
              onChange={(event) => setForm({ ...form, systemImage: event.target.value })}
              placeholder="wand.and.sparkles"
            />
          </Field>
          <Field label="排序">
            <Input
              required
              type="number"
              min={0}
              max={100000}
              value={form.sortOrder}
              onChange={(event) =>
                setForm({ ...form, sortOrder: Number(event.target.value) })
              }
            />
          </Field>
          <label className="flex min-h-11 items-center gap-3 self-end rounded-xl border border-border px-4 text-sm">
            <input
              type="checkbox"
              checked={form.thinkingEnabled}
              onChange={(event) =>
                setForm({ ...form, thinkingEnabled: event.target.checked })
              }
            />
            启用思考模式
          </label>
        </div>
        <LocalizationFields
          title="简体中文"
          value={form.localizations["zh-Hans"]}
          onChange={(value) =>
            setForm({
              ...form,
              localizations: { ...form.localizations, "zh-Hans": value },
            })
          }
        />
        <LocalizationFields
          title="English"
          value={form.localizations.en}
          onChange={(value) =>
            setForm({
              ...form,
              localizations: { ...form.localizations, en: value },
            })
          }
        />
        <div className="flex justify-end gap-2">
          <Button type="button" variant="secondary" onClick={onClose}>
            取消
          </Button>
          <Button type="submit" loading={saving}>
            保存
          </Button>
        </div>
      </form>
    </Dialog>
  );
}

function LocalizationFields({
  title,
  value,
  onChange,
}: {
  title: string;
  value: SkillLocalization;
  onChange: (value: SkillLocalization) => void;
}) {
  return (
    <fieldset className="space-y-3 rounded-2xl border border-border p-4">
      <legend className="px-2 text-sm font-semibold">{title}</legend>
      <div className="grid gap-3 sm:grid-cols-2">
        <Field label="名称">
          <Input
            required
            minLength={1}
            maxLength={40}
            value={value.name}
            onChange={(event) => onChange({ ...value, name: event.target.value })}
          />
        </Field>
        <Field label="摘要">
          <Input
            required
            minLength={1}
            maxLength={200}
            value={value.summary}
            onChange={(event) => onChange({ ...value, summary: event.target.value })}
          />
        </Field>
      </div>
      <Field label="Prompt">
        <Textarea
          required
          minLength={1}
          maxLength={6000}
          value={value.prompt}
          onChange={(event) => onChange({ ...value, prompt: event.target.value })}
        />
      </Field>
    </fieldset>
  );
}

function Field({ label, children }: { label: string; children: ReactNode }) {
  return (
    <label className="block text-sm font-medium">
      <span className="mb-1.5 block">{label}</span>
      {children}
    </label>
  );
}

function emptySkill(): CreateOfficialSkillRequest {
  return {
    id: "official.",
    systemImage: "sparkles",
    sortOrder: 0,
    thinkingEnabled: false,
    localizations: {
      "zh-Hans": { name: "", summary: "", prompt: "" },
      en: { name: "", summary: "", prompt: "" },
    },
  };
}

function skillToRequest(skill: OfficialSkill): CreateOfficialSkillRequest {
  return {
    id: skill.id,
    systemImage: skill.systemImage,
    sortOrder: skill.sortOrder,
    thinkingEnabled: skill.thinkingEnabled,
    localizations: skill.localizations,
  };
}

function formatHintPack(pack: AdminHintPack): string {
  return JSON.stringify(
    {
      generatedAt: pack.generatedAt,
      expiresAt: pack.expiresAt,
      intervalHours: pack.intervalHours,
      cards: pack.cards,
    },
    null,
    2,
  );
}

function optionalString(value: unknown): string | undefined {
  return typeof value === "string" && value.trim() ? value.trim() : undefined;
}

function errorMessage(error: unknown, fallback: string): string {
  return error instanceof ApiError ? error.message : fallback;
}