/* =============================================================================
 * B01_Dashboard_UI_View_People.ts
 * 세부 페이지 「사람」(549-1) — 탭 셋: 팀원 · 가입 요청(수 배지) · 초대.
 *   회사 관리자 = 자기 회사 · 시스템 관리자 = 머리에서 고른 회사
 *   팀원 줄 ⋯ = 수정 · 역할 변경 · 회사에서 빼기(빨강) — 확인은 그 모달이 맡음
 *   가입 요청 줄 = [승인] [거절] · 초대 = 이메일로 안내 메일 · 소속 없는 가입자는 [팀원 추가]
 * ========================================================================== */

import { createButton, createInputField, showToast } from "@ui/ui_template_elements";
import {
  fetchAllUsers,
  fetchCompanyJoinRequests,
  fetchCompanyMembers,
  inviteMember,
  type DashboardUser,
  type JoinRequest,
  type Member,
} from "./B01_Dashboard_Api_Fetch";
import { formatDate, L } from "./B01_Dashboard_UI_Common";
import { onB01_JoinRequest_Process_Click } from "./B01_Dashboard_UI_Company";
import { canChangeRole, canDeleteUser } from "./B01_Dashboard_UI_Helper";
import {
  openAddMemberModal,
  openChangeRoleModal,
  openDeleteUserModal,
  openEditUserModal,
} from "./B01_Dashboard_UI_Modals";
import {
  badge,
  dataTable,
  emptyState,
  kitIcon,
  pageFrame,
  primaryButton,
  rowMenu,
  tabBar,
  type Cell,
  type Column,
} from "./B01_Dashboard_UI_PageKit";
import type { ViewCtx } from "./B01_Dashboard_UI_Views";
import { pendingCount, roleText, statusBadgeOf } from "./logic/B01_Dashboard_Logic_Pages";

type TabKey = "members" | "requests" | "invite";
/** 승인 · 거절 뒤 페이지가 다시 그려져도 보던 탭을 유지 */
let lastTab: TabKey = "members";

const MEMBER_COLUMNS: Column[] = [
  { label: "이름" },
  { label: "이메일" },
  { label: "직급 · 부서" },
  { label: "역할", width: "120px" },
  { label: "상태", width: "90px" },
  { label: "", width: "44px" },
];
const REQUEST_COLUMNS: Column[] = [
  { label: "요청자" },
  { label: "이메일" },
  { label: "요청일", width: "110px" },
  { label: "상태", width: "90px" },
  { label: "", width: "150px", align: "end" },
];

function person(name: string): HTMLElement {
  const wrap = document.createElement("div");
  wrap.className = "b01-pg-person";
  const avatar = document.createElement("span");
  avatar.className = "b01-pg-avatar";
  avatar.textContent = (name.trim() || "?").slice(0, 1);
  const text = document.createElement("span");
  text.className = "b01-pg-name__main";
  text.textContent = name || "-";
  wrap.append(avatar, text);
  return wrap;
}

function memberRow(m: Member, ctx: ViewCtx): Cell[] {
  const me = ctx.me;
  const status = statusBadgeOf(m.status);
  const items = [{ label: L("Common_Btn_Edit"), onClick: () => openEditUserModal(me, m) }];
  const rows = [...items];
  if (canChangeRole(me, m)) {
    rows.push({ label: L("B01_Dashboard_ChangeRole"), onClick: () => openChangeRoleModal(m) });
  }
  const system = ctx.role === "SYSTEM_ADMIN";
  const removable = canDeleteUser(me, m) && (!system || m.id !== me.id);
  return [
    person(m.name),
    m.email,
    [m.position, m.department].filter(Boolean).join(" · ") || "-",
    badge(roleText(m.role), m.role === "ADMIN" || m.role === "SYSTEM_ADMIN" ? "accent" : "neutral"),
    badge(status.text, status.tone),
    rowMenu([
      ...rows,
      ...(removable
        ? [
            {
              label: L(system ? "B01_Dashboard_DeleteUser" : "B01_Dashboard_RemoveMember"),
              danger: true,
              ownConfirm: true,
              onClick: () => openDeleteUserModal(m),
            },
          ]
        : []),
    ]),
  ];
}

function requestRow(r: JoinRequest, system: boolean): Cell[] {
  const status = statusBadgeOf(r.status);
  const waiting = !r.status || r.status.toUpperCase() === "PENDING";
  const actions = document.createElement("span");
  actions.className = "b01-pg-inline";
  if (waiting) {
    actions.append(
      createButton({
        label: L("B01_Dashboard_Approve"),
        size: "sm",
        onClick: () => void onB01_JoinRequest_Process_Click(r.id, "APPROVE", system),
      }),
      createButton({
        label: L("B01_Dashboard_Reject"),
        size: "sm",
        variant: "danger",
        onClick: () => void onB01_JoinRequest_Process_Click(r.id, "REJECT", system),
      }),
    );
  }
  return [
    person(r.user_name ?? r.user_email),
    r.user_email,
    formatDate(r.requested_at),
    badge(status.text, status.tone),
    actions,
  ];
}

/** 초대 탭 — 아직 가입 전인 사람에게 안내 메일 · 이미 가입한 사람은 [팀원 추가] */
function invitePanel(companyId: number | null | undefined, onAdd: () => void): HTMLElement {
  const box = document.createElement("div");
  box.className = "b01-pg-card b01-pg-invite";
  const email = createInputField({
    label: "초대할 이메일",
    type: "email",
    placeholder: "name@company.com",
  });
  const send = createButton({
    label: "초대 메일 보내기",
    iconStart: kitIcon("mail"),
    onClick: async () => {
      const value = email.input.value.trim();
      if (!value.includes("@")) {
        email.setError("메일을 보낼 이메일 주소를 입력");
        return;
      }
      email.setError();
      try {
        await inviteMember(value, null, companyId);
        email.input.value = "";
        showToast("안내 메일을 보냈음", "success");
      } catch (error) {
        showToast(
          error instanceof Error ? error.message : L("B01_Dashboard_RequestFailed"),
          "error",
        );
      }
    },
  });
  const form = document.createElement("div");
  form.className = "b01-pg-invite__form";
  form.append(email.root, send);
  const note = document.createElement("p");
  note.className = "b01-pg-note";
  note.textContent = "아직 가입하지 않은 사람에게 가입 안내 메일만 보냄 · 계정은 본인이 만듦";
  const already = document.createElement("p");
  already.className = "b01-pg-note";
  already.append("이미 가입했고 소속이 없는 사람은 ");
  const link = document.createElement("button");
  link.type = "button";
  link.className = "b01-pg-link";
  link.textContent = "팀원 추가";
  link.addEventListener("click", onAdd);
  already.append(link, " 에서 바로 등록");
  box.append(form, note, already);
  return box;
}

async function loadPeople(ctx: ViewCtx): Promise<{ members: Member[]; requests: JoinRequest[] }> {
  const system = ctx.role === "SYSTEM_ADMIN";
  const [members, requests] = await Promise.all([
    (system ? fetchAllUsers(ctx.companyId) : fetchCompanyMembers()).catch(() => [] as Member[]),
    fetchCompanyJoinRequests(system ? ctx.companyId : undefined).catch(() => []),
  ]);
  return { members: members as DashboardUser[], requests };
}

export async function mountPeople(host: HTMLElement, ctx: ViewCtx): Promise<void> {
  const system = ctx.role === "SYSTEM_ADMIN";
  const companyId = system ? ctx.companyId : undefined;
  const page = pageFrame(host, "사람", "회사 팀원 · 가입 요청 · 초대를 한곳에서 관리");
  const addMember = (): void => openAddMemberModal(undefined, companyId);
  page.setAction(primaryButton("팀원 추가", addMember));

  const { members, requests } = await loadPeople(ctx);
  if (!host.isConnected) return;

  const content = document.createElement("div");
  const draw = (key: TabKey): void => {
    if (key === "members") {
      content.replaceChildren(
        members.length
          ? dataTable(
              MEMBER_COLUMNS,
              members.map((m) => memberRow(m, ctx)),
            )
          : emptyState({
              icon: "users",
              text: "등록된 팀원이 없음",
              action: primaryButton("팀원 추가", addMember),
              onGuide: () => ctx.go("guide"),
            }),
      );
    } else if (key === "requests") {
      content.replaceChildren(
        requests.length
          ? dataTable(
              REQUEST_COLUMNS,
              requests.map((r) => requestRow(r, system)),
            )
          : emptyState({ icon: "users", text: "대기 중인 가입 요청이 없음" }),
      );
    } else {
      content.replaceChildren(invitePanel(companyId, addMember));
    }
  };
  const tabs = tabBar(
    [
      { key: "members", label: "팀원" },
      { key: "requests", label: "가입 요청" },
      { key: "invite", label: "초대" },
    ],
    lastTab,
    (key) => draw((lastTab = key as TabKey)),
  );
  tabs.setBadge("requests", pendingCount(requests));
  page.body.append(tabs.root, content);
  draw(lastTab);
}