import { adminApi, ApiError } from "../api/client";
import type {
  AdminRole,
  LedgerEntry,
  PageResult,
  UserDetail,
  UserSummary,
  UserUsageAggregate,
} from "../api/types";
import {
  renderEmpty,
  renderError,
  renderLoading,
  setButtonBusy,
  showToast,
} from "../components/ui";
import {
  createIdempotencyKey,
  escapeHtml,
  formatDateTime,
  formatNumber,
  formatSignedCredits,
  statusLabel,
} from "../lib/format";

export function renderUsers(container: HTMLElement, role: AdminRole): void {
  container.innerHTML = `
    <div class="page-heading">
      <div>
        <div class="eyebrow">账户管理</div>
        <h1>用户查询</h1>
        <p>按内部用户 ID 精确查询，不展示 Apple 身份标识。</p>
      </div>
    </div>
    <section class="panel">
      <form class="search-form" data-search-form>
        <label class="search-box">
          <span class="sr-only">内部用户 ID</span>
          <span aria-hidden="true">⌕</span>
          <input name="query" type="search" placeholder="输入完整内部用户 ID" autocomplete="off" maxlength="36" required />
        </label>
        <wa-button variant="brand" appearance="accent" type="submit">搜索</wa-button>
      </form>
      <div data-results>${renderEmpty("输入查询条件开始搜索")}</div>
    </section>
  `;

  const form = container.querySelector<HTMLFormElement>("[data-search-form]");
  form?.addEventListener("submit", (event) => {
    event.preventDefault();
    const search = new FormData(form).get("query")?.toString().trim() ?? "";
    if (search) void searchUsers(container, search, role);
  });
}

async function searchUsers(
  container: HTMLElement,
  search: string,
  role: AdminRole,
): Promise<void> {
  const results = container.querySelector<HTMLElement>("[data-results]");
  if (!results) return;
  renderLoading(results, "搜索用户");

  try {
    const page = await adminApi.users(search);
    if (page.items.length === 0) {
      results.innerHTML = renderEmpty("未找到匹配用户");
      return;
    }
    results.innerHTML = `
      <div class="table-wrap">
        <table>
          <caption class="sr-only">用户查询结果</caption>
          <thead><tr><th scope="col">用户</th><th scope="col">状态</th><th scope="col">积分余额</th><th scope="col">注册时间</th><th scope="col">操作</th></tr></thead>
          <tbody>
            ${page.items.map(userRow).join("")}
          </tbody>
        </table>
      </div>
    `;
    results.querySelectorAll<HTMLButtonElement>("[data-user-id]").forEach(
      (button) => {
        button.addEventListener("click", () => {
          const userId = button.dataset.userId;
          if (userId) void renderUserDetail(container, userId, role);
        });
      },
    );
  } catch (error) {
    renderError(results, error, () => void searchUsers(container, search, role));
  }
}

function userRow(user: UserSummary): string {
  return `
    <tr>
      <td>
        <strong>${escapeHtml(user.displayName || "未命名用户")}</strong>
        <div class="subtle mono">${escapeHtml(user.userId)}</div>
      </td>
      <td><span class="badge badge--${escapeHtml(user.status)}">${statusLabel(user.status)}</span></td>
      <td>${formatNumber(user.creditBalance)}</td>
      <td>${formatDateTime(user.createdAt)}</td>
      <td><wa-button variant="neutral" appearance="outlined" size="s" data-user-id="${escapeHtml(user.userId)}" aria-label="查看 ${escapeHtml(user.displayName || user.userId)}">查看</wa-button></td>
    </tr>
  `;
}

async function renderUserDetail(
  container: HTMLElement,
  userId: string,
  role: AdminRole,
): Promise<void> {
  renderLoading(container, "加载用户详情");
  try {
    const [user, ledger] = await Promise.all([
      adminApi.user(userId),
      adminApi.ledger(userId),
    ]);
    container.innerHTML = detailTemplate(user, ledger, role);
    container
      .querySelector<HTMLButtonElement>("[data-back]")
      ?.addEventListener("click", () => {
        renderUsers(container, role);
        container.querySelector<HTMLInputElement>('input[name="query"]')?.focus();
      });
    bindLedgerPagination(container, user, ledger.nextCursor);
    if (role === "SUPER_ADMIN") bindGrantDialog(container, user, role);
    const heading = container.querySelector<HTMLElement>("h1");
    if (heading) {
      heading.tabIndex = -1;
      heading.focus({ preventScroll: true });
    }
  } catch (error) {
    renderError(container, error, () =>
      void renderUserDetail(container, userId, role),
    );
  }
}

function detailTemplate(
  user: UserDetail,
  ledger: PageResult<LedgerEntry>,
  role: AdminRole,
): string {
  const usage = user.usage ?? [];
  const usageRequests = usage.reduce((total, item) => total + item.requests, 0);
  const chargedCredits = usage.reduce(
    (total, item) => total + item.chargedCredits,
    0,
  );
  const referral = user.referral;
  const inviterUserId = referral?.inviterUserId ?? user.referredByUserId;
  const qualifiedUsage = user.qualifiedUsage || usageRequests > 0;

  return `
    <div class="page-heading page-heading--detail">
      <div>
        <wa-button class="back-link" appearance="plain" data-back>← 返回用户查询</wa-button>
        <div class="eyebrow">用户详情</div>
        <h1>${escapeHtml(user.displayName || "未命名用户")}</h1>
        <p class="mono">${escapeHtml(user.userId)}</p>
      </div>
      ${
        role === "SUPER_ADMIN"
          ? '<wa-button variant="brand" appearance="accent" data-open-grant>人工赠送积分</wa-button>'
          : ""
      }
    </div>
    <section class="detail-grid">
      <article class="panel profile-card">
        <div class="profile-header">
          <div class="avatar" aria-hidden="true">${escapeHtml((user.displayName || "用").slice(0, 1))}</div>
          <div><strong>${escapeHtml(user.displayName || "未命名用户")}</strong><span class="badge badge--${escapeHtml(user.status)}">${statusLabel(user.status)}</span></div>
        </div>
        <dl class="detail-list">
          <div><dt>积分余额</dt><dd class="credit-value">${formatNumber(user.creditBalance)}</dd></div>
          <div><dt>注册时间</dt><dd>${formatDateTime(user.createdAt)}</dd></div>
          <div><dt>最近活跃</dt><dd>${formatDateTime(user.lastActiveAt)}</dd></div>
          <div><dt>有效使用</dt><dd>${qualifiedUsage ? "已达成" : "未达成"}${usage.length > 0 ? ` · ${formatNumber(usageRequests)} 次请求` : ""}</dd></div>
          ${
            usage.length > 0
              ? `<div><dt>累计消耗</dt><dd>${formatNumber(chargedCredits)} 积分</dd></div>`
              : ""
          }
          <div><dt>邀请码</dt><dd class="mono">${escapeHtml(user.referralCode || "—")}</dd></div>
          <div><dt>邀请来源</dt><dd class="mono">${escapeHtml(inviterUserId || "—")}</dd></div>
          ${
            referral
              ? `<div><dt>邀请成效</dt><dd>${formatNumber(referral.rewardedInvites)} / ${formatNumber(referral.invitedUsers)} 已奖励</dd></div>`
              : ""
          }
        </dl>
      </article>
      <section class="panel">
        <div class="panel-heading"><div><h2>积分流水</h2><p>不可变账本记录</p></div></div>
        ${
          ledger.items.length === 0
            ? renderEmpty("暂无积分流水")
            : `
              <div class="table-wrap">
                <table>
                  <caption class="sr-only">${escapeHtml(user.displayName || user.userId)} 的积分流水</caption>
                  <thead><tr><th scope="col">时间</th><th scope="col">类型</th><th scope="col">变动</th><th scope="col">结余</th><th scope="col">原因</th></tr></thead>
                  <tbody data-ledger-body>${ledgerRows(ledger.items)}</tbody>
                </table>
              </div>
              ${
                ledger.nextCursor
                  ? '<div class="pagination-actions"><wa-button variant="neutral" appearance="outlined" data-ledger-more aria-describedby="ledger-pagination-status">加载更多流水</wa-button></div>'
                  : ""
              }
              <p class="sr-only" id="ledger-pagination-status" data-ledger-status role="status" aria-live="polite"></p>
            `
        }
      </section>
      ${usagePanel(usage)}
    </section>
    ${role === "SUPER_ADMIN" ? grantDialog(user) : ""}
  `;
}

function ledgerRows(entries: LedgerEntry[]): string {
  return entries
    .map(
      (entry) => `
        <tr>
          <td>${formatDateTime(entry.createdAt)}</td>
          <td>${escapeHtml(statusLabel(entry.type))}</td>
          <td class="${entry.amount >= 0 ? "positive" : "negative"}">${formatSignedCredits(entry.amount)}</td>
          <td>${formatNumber(entry.balanceAfter)}</td>
          <td>${escapeHtml(entry.reasonCode)}</td>
        </tr>
      `,
    )
    .join("");
}

function usagePanel(usage: UserUsageAggregate[]): string {
  if (usage.length === 0) return "";
  return `
    <section class="panel detail-panel--wide">
      <div class="panel-heading"><div><h2>使用统计</h2><p>按使用类型汇总，不包含用户内容</p></div></div>
      <div class="table-wrap">
        <table>
          <caption class="sr-only">用户使用统计</caption>
          <thead><tr><th scope="col">类型</th><th scope="col">请求</th><th scope="col">消耗积分</th><th scope="col">语音时长（毫秒）</th><th scope="col">输入 Token</th><th scope="col">输出 Token</th></tr></thead>
          <tbody>
            ${usage
              .map(
                (item) => `
                  <tr>
                    <td><code>${escapeHtml(item.kind)}</code></td>
                    <td>${formatNumber(item.requests)}</td>
                    <td>${formatNumber(item.chargedCredits)}</td>
                    <td>${formatNumber(item.asrMillis)}</td>
                    <td>${formatNumber(item.inputTokens)}</td>
                    <td>${formatNumber(item.outputTokens)}</td>
                  </tr>
                `,
              )
              .join("")}
          </tbody>
        </table>
      </div>
    </section>
  `;
}

function bindLedgerPagination(
  container: HTMLElement,
  user: UserDetail,
  initialCursor?: string,
): void {
  const button =
    container.querySelector<HTMLButtonElement>("[data-ledger-more]");
  const body =
    container.querySelector<HTMLTableSectionElement>("[data-ledger-body]");
  const status = container.querySelector<HTMLElement>("[data-ledger-status]");
  if (!button || !body || !initialCursor) return;
  let cursor: string | undefined = initialCursor;

  button.addEventListener("click", async () => {
    if (!cursor) return;
    setButtonBusy(button, true, "加载中…");
    try {
      const page = await adminApi.ledger(user.userId, cursor);
      body.insertAdjacentHTML("beforeend", ledgerRows(page.items));
      cursor = page.nextCursor;
      if (status) {
        status.textContent = cursor
          ? `已加载 ${formatNumber(page.items.length)} 条更多流水`
          : `已加载 ${formatNumber(page.items.length)} 条流水，全部记录已加载`;
      }
      if (!cursor) {
        button.closest(".pagination-actions")?.remove();
      } else {
        setButtonBusy(button, false);
        button.focus();
      }
    } catch (error) {
      showToast(
        error instanceof ApiError ? error.message : "加载积分流水失败",
        "error",
      );
      setButtonBusy(button, false);
      button.focus();
    }
  });
}

function grantDialog(user: UserDetail): string {
  return `
    <dialog class="dialog" data-grant-dialog aria-labelledby="grant-dialog-title">
      <form method="dialog" class="dialog-card" data-grant-form>
        <div data-grant-inputs>
          <div class="eyebrow">高风险操作</div>
          <h2 id="grant-dialog-title">人工赠送积分</h2>
          <p class="muted">赠送将写入不可变账本，并记录管理员审计日志。</p>
          <label><span>用户 ID</span><input value="${escapeHtml(user.userId)}" disabled /></label>
          <label><span>赠送积分</span><input name="amount" type="number" inputmode="numeric" min="1" max="100000" step="1" aria-describedby="grant-input-error" required /></label>
          <label><span>赠送原因</span><textarea name="reason" minlength="4" maxlength="200" placeholder="请填写可审计的业务原因" aria-describedby="grant-input-error" required></textarea></label>
          <p class="form-error" id="grant-input-error" data-error role="alert"></p>
          <div class="dialog-actions">
            <button class="button button--secondary" value="cancel">取消</button>
            <button class="button button--primary" type="button" data-review-grant>下一步</button>
          </div>
        </div>
        <div data-grant-confirm hidden>
          <div class="confirm-icon" aria-hidden="true">!</div>
          <h2 data-confirm-title tabindex="-1">确认赠送？</h2>
          <p>将向 <strong>${escapeHtml(user.displayName || user.userId)}</strong> 赠送 <strong data-confirm-amount></strong> 积分。</p>
          <p class="confirm-reason" data-confirm-reason></p>
          <p class="form-error" id="grant-confirm-error" data-confirm-error role="alert"></p>
          <div class="dialog-actions">
            <button class="button button--secondary" type="button" data-edit-grant>返回修改</button>
            <button class="button button--danger" type="button" data-submit-grant aria-describedby="grant-confirm-error">确认赠送</button>
          </div>
        </div>
      </form>
    </dialog>
  `;
}

function bindGrantDialog(
  container: HTMLElement,
  user: UserDetail,
  role: AdminRole,
): void {
  const dialog = container.querySelector<HTMLDialogElement>("[data-grant-dialog]");
  const form = container.querySelector<HTMLFormElement>("[data-grant-form]");
  const inputs = container.querySelector<HTMLElement>("[data-grant-inputs]");
  const confirm = container.querySelector<HTMLElement>("[data-grant-confirm]");
  if (!dialog || !form || !inputs || !confirm) return;
  let idempotencyKey = createIdempotencyKey();
  let outcomeUnknown = false;

  container
    .querySelector<HTMLButtonElement>("[data-open-grant]")
    ?.addEventListener("click", () => {
      idempotencyKey = createIdempotencyKey();
      outcomeUnknown = false;
      form.reset();
      inputs.hidden = false;
      confirm.hidden = true;
      form.querySelectorAll<HTMLElement>(".form-error").forEach((node) => {
        node.textContent = "";
      });
      dialog.showModal();
      form.querySelector<HTMLInputElement>('input[name="amount"]')?.focus();
    });

  dialog.addEventListener("cancel", (event) => {
    if (!outcomeUnknown) return;
    event.preventDefault();
    const errorNode = form.querySelector<HTMLElement>("[data-confirm-error]");
    if (errorNode) {
      errorNode.textContent = "赠送结果尚未确认，请使用当前窗口安全重试";
    }
  });

  container
    .querySelector<HTMLButtonElement>("[data-review-grant]")
    ?.addEventListener("click", () => {
      const data = new FormData(form);
      const amount = Number(data.get("amount"));
      const reason = data.get("reason")?.toString().trim() ?? "";
      const errorNode = form.querySelector<HTMLElement>("[data-error]");
      if (!Number.isSafeInteger(amount) || amount < 1 || amount > 100_000) {
        if (errorNode) errorNode.textContent = "积分必须是 1 至 100,000 的整数";
        return;
      }
      if (reason.length < 4) {
        if (errorNode) errorNode.textContent = "请填写至少 4 个字符的赠送原因";
        return;
      }
      if (errorNode) errorNode.textContent = "";
      const amountNode = form.querySelector<HTMLElement>("[data-confirm-amount]");
      const reasonNode = form.querySelector<HTMLElement>("[data-confirm-reason]");
      if (amountNode) amountNode.textContent = formatNumber(amount);
      if (reasonNode) reasonNode.textContent = `原因：${reason}`;
      inputs.hidden = true;
      confirm.hidden = false;
      form.querySelector<HTMLElement>("[data-confirm-title]")?.focus();
    });

  container
    .querySelector<HTMLButtonElement>("[data-edit-grant]")
    ?.addEventListener("click", () => {
      if (outcomeUnknown) {
        const errorNode = form.querySelector<HTMLElement>("[data-confirm-error]");
        if (errorNode) {
          errorNode.textContent = "结果尚未确认，不能修改本次赠送内容；请直接重试";
        }
        return;
      }
      confirm.hidden = true;
      inputs.hidden = false;
      form.querySelector<HTMLInputElement>('input[name="amount"]')?.focus();
    });

  const submit = container.querySelector<HTMLButtonElement>("[data-submit-grant]");
  submit?.addEventListener("click", async () => {
    const data = new FormData(form);
    const amount = Number(data.get("amount"));
    const reason = data.get("reason")?.toString().trim() ?? "";
    const errorNode = form.querySelector<HTMLElement>("[data-confirm-error]");
    setButtonBusy(submit, true, "赠送中…");
    if (errorNode) errorNode.textContent = "";
    try {
      await adminApi.grantCredits({
        userId: user.userId,
        amount,
        reason,
        idempotencyKey,
      });
      dialog.close();
      showToast("积分赠送成功，账本已更新", "success");
      await renderUserDetail(container, user.userId, role);
    } catch (error) {
      const message =
        error instanceof ApiError ? error.message : "赠送失败，请重试";
      outcomeUnknown =
        !(error instanceof ApiError) || error.status === 0 || error.status >= 500;
      if (errorNode) {
        errorNode.textContent = outcomeUnknown
          ? "赠送结果尚未确认；重试会复用同一请求，不会重复到账"
          : message;
      }
      setButtonBusy(submit, false);
    }
  });
}