import { useEffect, useState } from "react";
import { api } from "../api";
import type { BillingSummary, BillingTrend, Ledger, Project, TeamMember } from "../types";
import { money } from "./stage-config";
import { pageWindow } from "../components/pager";

const ROLE_LABEL: Record<string, string> = { owner: "超管", admin: "团管", member: "成员", viewer: "访客" };
const STATUS_LABEL: Record<string, string> = { active: "活跃", invited: "待激活", disabled: "已停用" };

type TrendRange = "day" | "week" | "month";
const RANGE_META: Record<TrendRange, { chip: string; sub: string; totalLabel: string; avgLabel: string }> = {
  day: { chip: "日", sub: "// 近 14 天 · 单位 ¥", totalLabel: "14 天合计", avgLabel: "日均" },
  week: { chip: "周", sub: "// 近 8 周 · 单位 ¥", totalLabel: "8 周合计", avgLabel: "周均" },
  month: { chip: "月", sub: "// 近 6 个月 · 单位 ¥", totalLabel: "6 月合计", avgLabel: "月均" }
};

type Tab = "overview" | "by-project" | "by-member" | "bills";

// 账单类型 / 详情 中文化(后端历史英文流水也一并映射;未知值原样透出)
const LEDGER_TYPE_LABEL: Record<string, string> = {
  recharge: "充值", reserve: "预扣", release: "释放", charge: "扣费", adjustment: "调整", refund: "退款"
};
const LEDGER_REASON_LABEL: Record<string, string> = {
  "reserve ai task credit": "AI 任务预扣额度",
  "charge ai task credit": "AI 任务扣费",
  "release reserved credit": "释放预留额度",
  "release unused reserved credit": "释放未用预留额度",
  "release unused credit": "释放未用额度"
};
const ledgerTypeLabel = (t: string) => LEDGER_TYPE_LABEL[t] ?? t;
const ledgerReasonLabel = (r: string) => LEDGER_REASON_LABEL[r] ?? r;

// 分页页码窗口:页数多时折叠成 1 … 当前±1 … 末页(≤7 页则全展开)
const RECHARGE: Array<{ amt: number; gift: string; bonus: boolean; bonusAmt: number; ribbon?: string }> = [
  { amt: 100, gift: "无赠送", bonus: false, bonusAmt: 0 },
  { amt: 500, gift: "+ ¥30 赠送", bonus: true, bonusAmt: 30, ribbon: "推荐" },
  { amt: 1000, gift: "+ ¥80 赠送", bonus: true, bonusAmt: 80 },
  { amt: 3000, gift: "+ ¥300 赠送", bonus: true, bonusAmt: 300 }
];

const STAGES: Array<{ k: string; color: string; bucket: keyof BillingTrend["by_stage"] }> = [
  { k: "视频片段(Seedance)", color: "var(--heat)", bucket: "video" },
  { k: "故事板(image-2)", color: "var(--accent-forest)", bucket: "storyboard" },
  { k: "基础资产", color: "var(--black-alpha-56)", bucket: "base" },
  { k: "脚本 LLM", color: "var(--black-alpha-32)", bucket: "script" }
];

export function AccountPage({ billing, projects, onRecharge }: {
  billing: BillingSummary | null;
  projects: Project[];
  onRecharge: (amount: number, bonus: number) => void | Promise<unknown>;
}) {
  const [tab, setTab] = useState<Tab>("overview");
  const [recharge, setRecharge] = useState(500);
  const [customAmt, setCustomAmt] = useState("");
  // 账户页数据本页自取(不再走全局 bootstrap):充值后 bump 刷新流水/趋势
  const [reloadFlag, setReloadFlag] = useState(0);

  // 趋势(day,首屏)+ 团队成员(成员/限额 tab)本页懒加载
  const [trend, setTrend] = useState<BillingTrend | null>(null);
  const [teamMembers, setTeamMembers] = useState<TeamMember[]>([]);
  useEffect(() => {
    let alive = true;
    api.billingTrend().then((d) => { if (alive) setTrend(d); }).catch(() => {});
    api.teamMembers().then((m) => { if (alive) setTeamMembers(m); }).catch(() => {});
    return () => { alive = false; };
  }, [reloadFlag]);

  // 账单流水分页:服务端分页(总数随流水增长,不再写死 100),每页 10 条
  const BILLS_PER_PAGE = 10;
  const [billPage, setBillPage] = useState(1);
  const [ledgerRows, setLedgerRows] = useState<Ledger[]>([]);
  const [ledgerCount, setLedgerCount] = useState<number>(0);
  const [ledgersLoading, setLedgersLoading] = useState(true);
  useEffect(() => {
    let alive = true;
    setLedgersLoading(true);
    api.ledgers(billPage, BILLS_PER_PAGE).then((data) => {
      if (!alive) return;
      setLedgerRows(data.results);
      setLedgerCount(data.count);
    }).catch(() => {}).finally(() => { if (alive) setLedgersLoading(false); });
    return () => { alive = false; };
  }, [billPage, reloadFlag]);
  const billTotalPages = Math.max(1, Math.ceil(ledgerCount / BILLS_PER_PAGE));
  const safeBillPage = Math.min(billPage, billTotalPages);

  const selectedCard = RECHARGE.find((item) => item.amt === recharge);
  const effectiveAmount = Number(customAmt) > 0 ? Number(customAmt) : recharge;
  const effectiveBonus = Number(customAmt) > 0 ? 0 : selectedCard?.bonusAmt || 0;

  async function submitRecharge() {
    if (effectiveAmount <= 0) return;
    await onRecharge(effectiveAmount, effectiveBonus);
    setCustomAmt("");
    setBillPage(1);
    setReloadFlag((n) => n + 1); // 充值后刷新流水/趋势(余额由全局 action→loadData 刷新)
  }

  const balance = Number(billing?.account.balance || 0);
  const used = Number(billing?.charged_total || 0);
  const memberLimit = teamMembers.reduce((sum, m) => sum + Math.max(0, Number(m.monthly_credit_limit || 0)), 0);
  const limit = memberLimit || balance;
  const left = Math.max(0, limit - used);
  const pct = limit > 0 ? Math.min(100, (used / limit) * 100) : 0;

  // 消费趋势(日/周/月可切)+ 按阶段 / 按项目分布 —— 全部来自真实 CHARGE 流水
  // day 用首屏 prop;week/month 切换时按真接口拉对应区间(缺接口已补 ?range=)
  const [range, setRange] = useState<TrendRange>("day");
  const [rangeTrend, setRangeTrend] = useState<BillingTrend | null>(null);
  useEffect(() => {
    if (range === "day") { setRangeTrend(null); return; }
    let alive = true;
    api.billingTrend(range).then((data) => { if (alive) setRangeTrend(data); }).catch(() => {});
    return () => { alive = false; };
  }, [range]);
  const activeTrend = range === "day" ? trend : rangeTrend;
  const meta = RANGE_META[range];

  const daily = activeTrend?.daily ?? [];
  const peak = Number(activeTrend?.peak || 0);
  const total14 = Number(activeTrend?.total_14d ?? used);
  const avgValue = daily.length ? total14 / daily.length : 0;
  const stageTotal = STAGES.reduce((sum, s) => sum + Number(trend?.by_stage[s.bucket] || 0), 0) || used;
  const projectSpend = (id: string) => Number(trend?.by_project[id] || 0);

  return (
    <section className="account-page">
      <div className="page-head">
        <div>
          <h1>消费</h1>
          <div className="sub"><span className="mono">// 余额 · 充值 · 4 维消费视图 + 账单流水</span></div>
        </div>
      </div>

      <div className="top-grid">
        <div className="balance-banner">
          <span className="corner-tr" aria-hidden="true"></span><span className="corner-bl" aria-hidden="true"></span>
          <div className="balance-hero">
            <div className="lbl">团队余额</div>
            <div className="v">{money(balance)}</div>
            <div className="meta">// 充值累加 · 不重置</div>
          </div>
          <div className="balance-sub">
            <div className="col">
              <div className="lbl">本月限额</div>
              <div className="v">{money(limit)}</div>
              <div className="meta">// 按自然月重置</div>
            </div>
            <div className="col">
              <div className="lbl">当月已用</div>
              <div className="v">{money(used)}</div>
              <div className="meta">// 占比 {pct.toFixed(1)}% · {pct >= 80 ? "注意" : "健康"}</div>
            </div>
          </div>
          <div className="balance-foot">
            <div className="balance-meter" aria-label={`本月额度使用率 ${pct.toFixed(1)}%`}><span style={{ width: `${pct}%` }} /></div>
            <div className="balance-foot-meta">
              <span>团队月剩余 {money(left)}</span>
              <span>使用率 {pct.toFixed(1)}%</span>
            </div>
          </div>
        </div>

        <div className="pane topup-pane">
          <div className="topup-head">
            <div>
              <h3>快速充值</h3>
              <div className="desc">// 充值后立刻到账,可开发票 · 仅超管可操作</div>
            </div>
            <div className="topup-selected">已选 ¥{effectiveAmount}{effectiveBonus > 0 ? ` + ¥${effectiveBonus} 赠送` : ""}</div>
          </div>
          <div className="recharge-row">
            {RECHARGE.map((item) => (
              <div
                key={item.amt}
                className={`recharge-card ${recharge === item.amt ? "selected" : ""}`}
                role="button"
                tabIndex={0}
                aria-pressed={recharge === item.amt}
                onClick={() => setRecharge(item.amt)}
              >
                {item.ribbon && <span className="ribbon">{item.ribbon}</span>}
                <div className="amt">¥{item.amt}</div>
                <div className={`gift ${item.bonus ? "bonus" : ""}`}>{item.gift}</div>
              </div>
            ))}
          </div>
          <div className="pay-row">
            <div className="pay-title">自定义金额</div>
            <input className="input" placeholder="最低 ¥50,可输入任意金额" type="number" value={customAmt} onChange={(event) => setCustomAmt(event.target.value)} />
            <div className="pay-btn-row">
              <button className="btn pay-method-btn pay-wechat" type="button" aria-label="微信支付" onClick={submitRecharge}>
                <span className="pay-logo" aria-hidden="true"><img src="/assets/pay-wechat.png" alt="" /></span>
                微信支付
              </button>
              <button className="btn pay-method-btn pay-alipay" type="button" aria-label="支付宝" onClick={submitRecharge}>
                <span className="pay-logo" aria-hidden="true"><img src="/assets/pay-alipay.png" alt="" /></span>
                支付宝
              </button>
            </div>
          </div>
        </div>
      </div>

      <div className="billing-tabs" role="tablist">
        <button className={`tab ${tab === "overview" ? "active" : ""}`} type="button" onClick={() => setTab("overview")}>总览</button>
        <button className={`tab ${tab === "by-project" ? "active" : ""}`} type="button" onClick={() => setTab("by-project")}>项目 <span className="count">{projects.length}</span></button>
        <button className={`tab ${tab === "by-member" ? "active" : ""}`} type="button" onClick={() => setTab("by-member")}>成员 <span className="count">{teamMembers.length}</span></button>
        <button className={`tab ${tab === "bills" ? "active" : ""}`} type="button" onClick={() => setTab("bills")}>账单流水 <span className="count">{ledgerCount}</span></button>
      </div>

      <div className={`tab-panel ${tab === "overview" ? "active" : ""}`}>
        <div className="overview-grid">
          <div className="pane trend-pane">
            <div className="trend-head">
              <h3>消费趋势</h3>
              <span className="sub">{meta.sub}</span>
              <span className="spacer"></span>
              {(["day", "week", "month"] as TrendRange[]).map((r) => (
                <button key={r} className={`chip${range === r ? " active" : ""}`} type="button" onClick={() => setRange(r)}>{RANGE_META[r].chip}</button>
              ))}
            </div>
            <div className="trend-chart">
              <div className="bars">
                {daily.map((d) => {
                  const amt = Number(d.amount);
                  const h = peak > 0 ? Math.max(amt > 0 ? 4 : 0, (amt / peak) * 100) : 0;
                  const isPeak = peak > 0 && amt === peak;
                  return (
                    <div className={`bar${isPeak ? " peak" : ""}`} key={d.date} title={`${d.label} · ${money(amt)}`}>
                      <span style={{ height: `${h}%` }} />
                    </div>
                  );
                })}
              </div>
              <div className="x-axis">
                {daily.map((d, i) => (
                  <span key={d.date}>{i % 2 === 0 ? d.label : ""}</span>
                ))}
              </div>
            </div>
            <div className="trend-foot">
              <div className="item"><span className="k">{meta.totalLabel}</span><span className="v">{money(total14)}</span></div>
              <div className="item"><span className="k">{meta.avgLabel}</span><span className="v">{money(avgValue)}</span></div>
              <div className="item"><span className="k">峰值</span><span className="v warn">{money(peak)}</span></div>
            </div>
          </div>

          <div className="pane stage-pane">
            <h3>本月按阶段分布</h3>
            <div className="desc">// PRD §5.3.5 扣费规则 · 仅确认后扣</div>
            {STAGES.map((s) => {
              const amt = Number(trend?.by_stage[s.bucket] || 0);
              const w = stageTotal > 0 ? Math.min(100, (amt / stageTotal) * 100) : 0;
              return (
                <div key={s.k}>
                  <div className="usage-line"><span className="k">{s.k}</span><span className="v">{money(amt)}</span></div>
                  <div className="usage-bar"><span style={{ width: `${w}%`, background: s.color }} /></div>
                </div>
              );
            })}
            <div className="total"><span>合计</span><span className="v">{money(used)}</span></div>
          </div>
        </div>

        <div className="pane rule-pane" style={{ marginTop: 16 }}>
          <h3>扣费 + 四层额度预检规则</h3>
          <div className="desc">// PRD §5.3.5 + §10.3 · 对接团队请以此页为准</div>
          <div className="rule-list">
            <strong>① 失败不扣</strong>:模型超时 / 内容审核拦截 / 生成异常一律不扣费。<br />
            <strong>② 用户重跑不扣首次</strong>:第一次重跑保留原扣费,第二次起按次结算。<br />
            <strong>③ 仅在你点击 <span className="mono-acc">[ 确认通过 ]</span> 时入账</strong>。<br />
            <strong>④ 导出不再扣费</strong>,所有 token 已在过程中结算。
          </div>
          <div className="quota-rules">
            <div className="qr-head">// 任务确认前 · 四层额度预检(任一不通过即拦截)</div>
            <div className="step"><span className="num">1</span><span><strong>个人日剩余</strong> ≥ 任务预估 × <span className="formula">1.2</span></span></div>
            <div className="step"><span className="num">2</span><span><strong>个人月剩余</strong> ≥ 同上</span></div>
            <div className="step"><span className="num">3</span><span><strong>团队月剩余</strong> ≥ 同上</span></div>
            <div className="step"><span className="num">4</span><span><strong>团队总余额</strong> ≥ 同上</span></div>
          </div>
        </div>
      </div>

      <div className={`tab-panel ${tab === "bills" ? "active" : ""}`}>
        <div className="billing-table-wrap">
        <table className="billing-table">
          <thead><tr><th>时间</th><th>项目 / 类型</th><th>详情</th><th>成员</th><th>状态</th><th style={{ textAlign: "right" }}>金额</th></tr></thead>
          <tbody>
            {ledgersLoading && ledgerRows.length === 0 ? (
              <tr><td colSpan={6} className="muted" style={{ textAlign: "center", padding: "24px 0" }}>// 加载中…</td></tr>
            ) : ledgerRows.length === 0 ? (
              <tr><td colSpan={6} className="muted" style={{ textAlign: "center", padding: "24px 0" }}>// 暂无账单流水</td></tr>
            ) : ledgerRows.map((l) => (
              <tr key={l.id}>
                <td className="ts">{new Date(l.created_at).toLocaleString("zh-CN")}</td>
                <td>{ledgerTypeLabel(l.ledger_type)}</td>
                <td className="muted">{ledgerReasonLabel(l.reason)}</td>
                <td>{l.user_label
                  ? <span className="who"><span className="av">{l.user_label.slice(0, 1).toUpperCase()}</span>{l.user_label}</span>
                  : <span className="sys">系统</span>}</td>
                <td><span className="status-tag ok">成功</span></td>
                <td className="neg">{l.amount}</td>
              </tr>
            ))}
          </tbody>
        </table>
        </div>
        {ledgerCount > BILLS_PER_PAGE && (
          <div className="bill-pager">
            <span className="total">// 共 {ledgerCount} 条 · 第 {safeBillPage} / {billTotalPages} 页</span>
            <div className="pages">
              <button type="button" disabled={safeBillPage <= 1} onClick={() => setBillPage(safeBillPage - 1)}>上一页</button>
              {pageWindow(safeBillPage, billTotalPages).map((p, i) => (
                p === "ellipsis"
                  ? <span key={`e${i}`} className="ellipsis">…</span>
                  : <button key={p} className={p === safeBillPage ? "active" : ""} type="button" onClick={() => setBillPage(p)}>{p}</button>
              ))}
              <button type="button" disabled={safeBillPage >= billTotalPages} onClick={() => setBillPage(safeBillPage + 1)}>下一页</button>
            </div>
          </div>
        )}
      </div>

      <div className={`tab-panel ${tab === "by-project" ? "active" : ""}`}>
        <div className="billing-table-wrap">
        <table className="billing-table">
          <thead><tr><th>项目</th><th>当前阶段</th><th>状态</th><th style={{ textAlign: "right" }}>消耗</th></tr></thead>
          <tbody>
            {projects.map((p) => {
              const spend = projectSpend(p.id);
              return (
                <tr key={p.id}><td>{p.name}</td><td>{p.current_stage}</td><td>{p.status}</td><td className={spend > 0 ? "neg" : "zero"}>{money(spend)}</td></tr>
              );
            })}
          </tbody>
        </table>
        </div>
      </div>

      <div className={`tab-panel ${tab === "by-member" ? "active" : ""}`}>
        <div className="billing-table-wrap">
        <table className="billing-table">
          <thead><tr><th>成员</th><th>角色</th><th>已用 / 月度额度</th><th>状态</th></tr></thead>
          <tbody>
            {teamMembers.map((m) => {
              const monthly = Number(m.monthly_credit_limit || 0);
              return (
              <tr key={m.id}><td className="who"><span className="av">{m.user.username.slice(0, 1).toUpperCase()}</span>{m.user.username}</td><td>{ROLE_LABEL[m.role] || m.role}</td><td className="quota"><span className="used">{money(m.month_charged || 0)}</span> <span className="lim">/ {monthly > 0 ? money(monthly) : "不限"}</span></td><td>{STATUS_LABEL[m.status] || m.status}</td></tr>
              );
            })}
          </tbody>
        </table>
        </div>
      </div>
    </section>
  );
}