"use client";

import { useEffect, useState } from "react";
import { Ban, Loader2, RotateCcw, ShieldCheck, Users as UsersIcon } from "lucide-react";
import { apiAdminSetUserBan, apiAdminSetUserRole, type Board } from "@/lib/api";
import { ROLES, ROLE_META } from "@/lib/roles";
import { toast } from "@/lib/toast";
import Modal from "@/components/Modal";

/** 角色与账号弹窗所需的最小用户形状（后台列表项 / 公开资料均可） */
export interface RoleAccountTarget {
  id: number;
  username: string;
  nickname: string;
  role: string;
  board_ids?: number[];
  banned: boolean;
}

interface RoleOption {
  value: string;
  title: string;
  desc: string;
  token: string;
}

/**
 * 角色授权 + 封禁状态弹窗。
 * 后台用户管理与前台 StaffUserMenu 共用，避免两套表单。
 */
export default function RoleAccountModal({
  target,
  boards,
  canGrantSuper,
  acting,
  onClose,
  onSaved,
  setActing,
}: {
  target: RoleAccountTarget | null;
  boards: Board[];
  canGrantSuper: boolean;
  acting: boolean;
  onClose: () => void;
  onSaved: (next: RoleAccountTarget) => void;
  setActing: (v: boolean) => void;
}) {
  const grantKeys = [
    ROLES.SUPER_ADMIN,
    ROLES.ADMIN,
    ROLES.BOARD_ADMIN,
    ROLES.USER,
  ] as const;

  const options: RoleOption[] = grantKeys
    .filter((k) => canGrantSuper || k !== ROLES.SUPER_ADMIN)
    .map((k) => {
      const meta = ROLE_META[k];
      return {
        value: k,
        title: meta.label,
        desc: meta.grantDesc || "",
        token: meta.colorToken,
      };
    });

  const [role, setRole] = useState<string>(ROLES.USER);
  const [boardIds, setBoardIds] = useState<number[]>([]);
  const [banned, setBanned] = useState(false);
  const [err, setErr] = useState("");

  useEffect(() => {
    if (target) {
      setRole(target.role === ROLES.OWNER ? ROLES.USER : target.role);
      setBoardIds(target.board_ids ?? []);
      setBanned(!!target.banned);
      setErr("");
    }
  }, [target]);

  if (!target) return null;

  const toggleBoard = (id: number) => {
    setBoardIds((prev) => (prev.includes(id) ? prev.filter((b) => b !== id) : [...prev, id]));
  };

  const sameBoards =
    JSON.stringify([...(target.board_ids ?? [])].sort((a, b) => a - b)) ===
    JSON.stringify([...boardIds].sort((a, b) => a - b));
  const roleChanged = role !== target.role || (role === ROLES.BOARD_ADMIN && !sameBoards);
  const banChanged = banned !== !!target.banned;
  const willBan = banChanged && banned;
  const willUnban = banChanged && !banned;

  const submit = async () => {
    if (role === ROLES.BOARD_ADMIN && boardIds.length === 0) {
      setErr("请至少选择一个授权板块");
      return;
    }
    if (!roleChanged && !banChanged) {
      onClose();
      return;
    }
    setActing(true);
    try {
      let nextRole = target.role;
      let nextBoards = target.board_ids ?? [];
      let nextBanned = !!target.banned;
      if (roleChanged) {
        const res = await apiAdminSetUserRole(
          target.id,
          role,
          role === ROLES.BOARD_ADMIN ? boardIds : []
        );
        nextRole = res.user.role;
        nextBoards = res.user.board_ids ?? [];
      }
      if (banChanged) {
        const res = await apiAdminSetUserBan(target.id, banned);
        nextBanned = !!res.user.banned;
      }
      const parts: string[] = [];
      if (roleChanged) parts.push("角色已更新");
      if (willBan) parts.push("已封禁");
      if (willUnban) parts.push("已解封");
      toast(parts.join(" · ") || "已保存", "ok");
      onSaved({
        id: target.id,
        username: target.username,
        nickname: target.nickname,
        role: nextRole,
        board_ids: nextBoards,
        banned: nextBanned,
      });
    } catch (e) {
      toast(e instanceof Error ? e.message : "操作失败");
    } finally {
      setActing(false);
    }
  };

  const saveLabel = willBan ? "保存并封禁" : willUnban ? "保存并解封" : "保存";

  return (
    <Modal
      open
      title="角色与账号"
      description={
        <>
          <span className="truncate block">
            @{target.username}（{target.nickname}）
          </span>
          <span className="block mt-1">
            角色决定后台入口与前台管理能力；封禁立即强制下线。站长内容档案仍走列表入口。
          </span>
        </>
      }
      onClose={onClose}
      busy={acting}
      maxWidthClass="max-w-[500px]"
      panelClassName="p-6 max-h-[88vh] overflow-y-auto"
      ariaLabel="角色与账号"
      footer={
        <>
          <button type="button" className="btn btn-line" onClick={onClose} disabled={acting}>
            取消
          </button>
          <button
            type="button"
            className={willBan ? "btn btn-danger" : "btn btn-primary"}
            onClick={submit}
            disabled={acting}
          >
            {acting && <Loader2 size={15} className="animate-spin" />}
            {saveLabel}
          </button>
        </>
      }
    >
      <p className="mb-2 text-[12.5px]" style={{ color: "var(--ink)" }}>
        管理角色
      </p>
      <div className="flex flex-col gap-2" role="radiogroup" aria-label="管理角色">
        {options.map((o) => {
          const active = role === o.value;
          return (
            <button
              key={o.value}
              type="button"
              role="radio"
              aria-checked={active}
              onClick={() => {
                setRole(o.value);
                setErr("");
              }}
              className="text-left rounded-xl p-3.5 flex items-start gap-3 transition-colors"
              style={{
                border: `1.5px solid ${active ? "var(--accent)" : "var(--line)"}`,
                background: active ? "var(--accent-soft)" : "var(--panel-2)",
              }}
            >
              <span
                className="w-9 h-9 rounded-lg flex items-center justify-center shrink-0 mt-0.5"
                style={{
                  background: active ? "var(--accent)" : "var(--panel)",
                  color: active ? "var(--accent-on)" : `var(${o.token})`,
                }}
                aria-hidden="true"
              >
                {o.value === ROLES.USER ? <UsersIcon size={18} /> : <ShieldCheck size={18} />}
              </span>
              <span className="min-w-0 flex-1">
                <span className="block text-[13.5px] font-medium" style={{ color: "var(--ink)" }}>
                  {o.title}
                </span>
                <span className="block mt-1 text-[12px] leading-relaxed" style={{ color: "var(--ink-3)" }}>
                  {o.desc}
                </span>
              </span>
              <span
                className="mt-1 w-4 h-4 rounded-full shrink-0 flex items-center justify-center"
                style={{ border: `2px solid ${active ? "var(--accent)" : "var(--line-2)"}` }}
                aria-hidden="true"
              >
                {active && <span className="w-2 h-2 rounded-full" style={{ background: "var(--accent)" }} />}
              </span>
            </button>
          );
        })}
      </div>

      {role === ROLES.BOARD_ADMIN && (
        <div className="mt-4">
          <p className="text-[12.5px] mb-2" style={{ color: "var(--ink)" }}>
            授权板块 <span style={{ color: "var(--danger)" }}>*</span>
          </p>
          {boards.length === 0 ? (
            <p className="meta text-[12px]">板块加载中…</p>
          ) : (
            <div className="grid grid-cols-2 gap-2">
              {boards.map((b) => {
                const checked = boardIds.includes(b.id);
                return (
                  <button
                    key={b.id}
                    type="button"
                    role="checkbox"
                    aria-checked={checked}
                    onClick={() => toggleBoard(b.id)}
                    className="flex items-center gap-2 rounded-lg px-3 py-2 text-[12.5px] transition-colors"
                    style={{
                      border: `1.5px solid ${checked ? "var(--accent)" : "var(--line)"}`,
                      background: checked ? "var(--accent-soft)" : "var(--panel-2)",
                      color: checked ? "var(--accent)" : "var(--ink-2)",
                    }}
                  >
                    <span
                      className="w-4 h-4 rounded shrink-0 flex items-center justify-center"
                      style={{ border: `2px solid ${checked ? "var(--accent)" : "var(--line-2)"}` }}
                      aria-hidden="true"
                    >
                      {checked && (
                        <svg width="10" height="10" viewBox="0 0 24 24" fill="none" stroke="currentColor" strokeWidth="3.5" strokeLinecap="round" strokeLinejoin="round">
                          <path d="M20 6 9 17l-5-5" />
                        </svg>
                      )}
                    </span>
                    <span className="truncate">{b.name}</span>
                  </button>
                );
              })}
            </div>
          )}
          {err && (
            <p className="mt-2 text-[12px]" style={{ color: "var(--danger)" }}>
              {err}
            </p>
          )}
        </div>
      )}

      <div className="mt-5 pt-4" style={{ borderTop: "1px solid var(--line)" }}>
        <p className="text-[12.5px] mb-2" style={{ color: "var(--ink)" }}>
          账号状态
        </p>
        <div className="grid grid-cols-2 gap-2" role="radiogroup" aria-label="账号状态">
          <button
            type="button"
            role="radio"
            aria-checked={!banned}
            onClick={() => setBanned(false)}
            className="rounded-xl px-3 py-2.5 text-left transition-colors"
            style={{
              border: `1.5px solid ${!banned ? "var(--ok)" : "var(--line)"}`,
              background: !banned ? "var(--ok-soft)" : "var(--panel-2)",
            }}
          >
            <span
              className="flex items-center gap-1.5 text-[13px] font-medium"
              style={{ color: !banned ? "var(--ok)" : "var(--ink)" }}
            >
              <RotateCcw size={14} /> 正常
            </span>
            <span className="block mt-1 text-[11.5px] leading-snug" style={{ color: "var(--ink-3)" }}>
              可登录与互动
            </span>
          </button>
          <button
            type="button"
            role="radio"
            aria-checked={banned}
            onClick={() => setBanned(true)}
            className="rounded-xl px-3 py-2.5 text-left transition-colors"
            style={{
              border: `1.5px solid ${banned ? "var(--danger)" : "var(--line)"}`,
              background: banned ? "var(--danger-soft)" : "var(--panel-2)",
            }}
          >
            <span
              className="flex items-center gap-1.5 text-[13px] font-medium"
              style={{ color: banned ? "var(--danger)" : "var(--ink)" }}
            >
              <Ban size={14} /> 封禁
            </span>
            <span className="block mt-1 text-[11.5px] leading-snug" style={{ color: "var(--ink-3)" }}>
              强制下线，禁止登录
            </span>
          </button>
        </div>
        {willBan && (
          <p className="mt-2 text-[12px] leading-relaxed" style={{ color: "var(--danger)" }}>
            封禁后立即强制下线，无法登录、发帖与回复；已发布内容保留。角色变更与封禁将一并保存。
          </p>
        )}
      </div>
    </Modal>
  );
}