/**
 * 管理员两表的本地 Mock（vite-plugin-mock，仅 `npm run dev:mock` 生效）。
 *
 * 用途与背景同 baseapi.ts：本机没有 UserBase 授权数据（执行手册 §5 P1 降级取证先例），
 * 角色设置 tab 与「表单管理员」弹窗的两表 CRUD 往返只能在 mock 里实拍。
 * 桩刻意把后端三条规则也演一遍，好让冒烟脚本能断言到"前端没有把规则写丢"：
 * ① 重复添加幂等（不重复建行、不报错）；② 校级管理员删到剩 0 拒；③ 写操作回全量列表。
 */
import type { AdminRow } from "@/types/admin";

const ok = (data: unknown) => ({ code: 0, msg: "", data });
const fail = (msg: string) => ({ code: 500, msg, data: null });

let seq = 1;
const schoolAdmins: AdminRow[] = [];
const formAdmins: Record<string, AdminRow[]> = {};

function row(userId: number, userName: string): AdminRow {
    return { id: seq++, userId, userName };
}

/** 追加（幂等：已存在的 userId 跳过，姓名快照不覆盖） */
function merge(list: AdminRow[], users: { userId: number; userName: string }[]): AdminRow[] {
    for (const item of users || []) {
        if (!item || item.userId == null) continue;
        if (!list.some((r) => r.userId === Number(item.userId))) {
            list.push(row(Number(item.userId), String(item.userName || "")));
        }
    }
    return list;
}

/** 路径里的 id / formUuid：vite-plugin-mock 不保证把 REST 段塞进 query，直接从 url 取最稳 */
function idFrom(url: string): number | null {
    const matched = /\/(\d+)(?:\?|$)/.exec(url || "");
    return matched ? Number(matched[1]) : null;
}

function formUuidFrom(url: string): string {
    const matched = /\/forms\/([\w-]+)\/admins/.exec(url || "");
    return matched ? matched[1] : "";
}

export default [
    {
        url: "/api/form/admin/school-admins",
        method: "get",
        response: () => ok(schoolAdmins.slice())
    },
    {
        url: "/api/form/admin/school-admins",
        method: "post",
        response: ({ body }: any) => ok(merge(schoolAdmins, body?.users || []))
    },
    {
        url: "/api/form/admin/school-admins/:id",
        method: "delete",
        response: ({ url }: any) => {
            const id = idFrom(url);
            if (schoolAdmins.length <= 1) return fail("本校至少保留一名校级表单管理员，最后一名不可删除");
            const index = schoolAdmins.findIndex((r) => r.id === id);
            if (index < 0) return fail("校级管理员记录不存在：" + id);
            schoolAdmins.splice(index, 1);
            return ok(schoolAdmins.slice());
        }
    },
    {
        url: "/api/form/admin/forms/:formUuid/admins",
        method: "get",
        response: ({ url }: any) => ok((formAdmins[formUuidFrom(url)] || []).slice())
    },
    {
        url: "/api/form/admin/forms/:formUuid/admins",
        method: "post",
        response: ({ url, body }: any) => {
            const uuid = formUuidFrom(url);
            formAdmins[uuid] = formAdmins[uuid] || [];
            return ok(merge(formAdmins[uuid], body?.users || []));
        }
    },
    {
        url: "/api/form/admin/forms/:formUuid/admins/:id",
        method: "delete",
        response: ({ url }: any) => {
            const uuid = formUuidFrom(url);
            const id = idFrom(url);
            const list = formAdmins[uuid] || [];
            const index = list.findIndex((r) => r.id === id);
            if (index < 0) return fail("表单管理员记录不存在：" + id);
            list.splice(index, 1);
            return ok(list.slice());
        }
    }
];