import { useState } from "react";
import { Database, Download, History, RefreshCw, Save, Settings2, Users } from "lucide-react";
import { toast } from "sonner";

import { Button } from "~/components/ui/button";
import { Card, CardAction, CardContent, CardDescription, CardHeader, CardTitle } from "~/components/ui/card";
import { Input } from "~/components/ui/input";
import { Table, TableBody, TableCell, TableHead, TableHeader, TableRow } from "~/components/ui/table";
import { exportRowsToExcel } from "~/lib/exportExcel";
import { usePersistentState } from "~/hooks/use-persistent-state";
import { FilterSelect, OperationsPageHeader } from "./OperationsUi";
import { BANK_REPORT_CONFIG, TEMPLATE_VERSIONS } from "./governanceData";

function nextGeneration(frequency: string, day: number): string {
  const formattedDay = String(day).padStart(2, "0");
  if (frequency === "月度") return `2026-09-${formattedDay}`;
  if (frequency === "季度") return `2026-10-${formattedDay}`;
  return `2027-01-${formattedDay}`;
}

export default function SystemConfigPage() {
  const [readDay, setReadDay] = usePersistentState("a-card-config-read-day", "15 日");
  const [readPeriod, setReadPeriod] = usePersistentState("a-card-config-read-period", "上一周期（月）");
  const [templates, setTemplates] = usePersistentState("a-card-template-versions", TEMPLATE_VERSIONS);
  const [selectedBank, setSelectedBank] = useState("江城银行");
  const [bankConfigs, setBankConfigs] = usePersistentState("a-card-bank-report-config", BANK_REPORT_CONFIG);
  const currentBankConfig = bankConfigs[selectedBank] ?? { frequency: "月度", day: 15 };
  const notificationRows = [
    ["通知通道", "短信 + 平台通知"],
    ["报告未阅读催办", "模型团队 5 个工作日 · 业务团队 5 个工作日"],
    ["监控结果未处理催办", "1 个月未选择处理建议"],
    ["开发评审环节停滞", "1 个月未更新记录"],
    ["B/C 等级预警", "每月汇总，短信 + 平台通知"],
  ];

  const publishTemplate = () => {
    const version = `T${Number(templates[0]?.version.slice(1) ?? 4) + 1}`;
    setTemplates((current) => [{ version, author: "管理员 王芳", createdAt: "2026-08-31 11:30", current: true, note: "手动发布（Mock）" }, ...current.map((item) => ({ ...item, current: false }))]);
    toast.success(`报告模板 ${version} 已模拟发布`);
  };

  const updateBankConfig = (updates: Partial<{ frequency: string; day: number }>) => {
    setBankConfigs((current) => ({ ...current, [selectedBank]: { ...currentBankConfig, ...updates } }));
  };

  return (
    <section className="h-full overflow-auto bg-bg p-6">
      <div className="mx-auto flex max-w-screen-2xl flex-col gap-6 pb-8">
        <OperationsPageHeader title="运维系统配置" description="维护指标读取、报告模板、通知催办和银行报告周期。" actions={<Button onClick={() => toast.success("配置已保存至前端 Mock 状态")}><Save />保存配置</Button>} />

        <div className="grid grid-cols-2 gap-6">
          <Card>
            <CardHeader><CardTitle className="flex items-center gap-2"><Database className="size-5 text-primary" />指标读取配置</CardTitle><CardDescription>从共享数据库读取模型平台计算结果</CardDescription></CardHeader>
            <CardContent className="space-y-4">
              <div className="grid grid-cols-2 gap-3"><FilterSelect label="读取日（每月）" value={readDay} allLabel="请选择" options={["1 日", "15 日", "20 日"]} onChange={setReadDay} /><FilterSelect label="读取周期" value={readPeriod} allLabel="请选择" options={["上一周期（月）", "上一周期（季）"]} onChange={setReadPeriod} /></div>
              <Button className="w-full" variant="outline" onClick={() => toast.success("已模拟触发共享 DB 指标同步")}><RefreshCw />立即重新读取上一周期指标</Button>
              <p className="rounded-xl bg-muted/50 p-4 text-xs leading-5 text-muted-foreground">读取排序性、KS、PSI、IV、CSI。本平台不重算指标，只读取模型平台计算结果；共享表名和字段映射待接口设计阶段确定。</p>
            </CardContent>
          </Card>

          <Card>
            <CardHeader><CardTitle className="flex items-center gap-2"><History className="size-5 text-primary" />报告模板版本管理</CardTitle><CardDescription>监控报告与诊断报告共用版本体系</CardDescription><CardAction><Button size="sm" onClick={publishTemplate}>发布新版本</Button></CardAction></CardHeader>
            <CardContent className="space-y-3">{templates.map((template) => <div className="flex items-center gap-3 rounded-xl border border-border p-4" key={template.version}><b className="text-sm text-foreground">{template.version}</b><span className="min-w-0 flex-1"><small className="block truncate text-xs text-muted-foreground">{template.note}</small><small className="text-3xs text-muted-foreground">{template.author} · {template.createdAt}</small></span>{template.current ? <span className="rounded-full bg-success-soft px-2.5 py-1 text-xs text-success-strong">当前生效</span> : <Button variant="outline" size="xs" onClick={() => { setTemplates((current) => current.map((item) => ({ ...item, current: item.version === template.version }))); toast.success(`报告模板已模拟回滚至 ${template.version}`); }}>一键回滚</Button>}</div>)}</CardContent>
          </Card>
        </div>

        <div className="grid grid-cols-2 gap-6">
          <Card>
            <CardHeader className="border-b border-border"><CardTitle>通知与催办</CardTitle><CardDescription>邮件通道已取消</CardDescription><CardAction><Button variant="outline" size="xs" onClick={() => void exportRowsToExcel({ fileName: "通知与催办配置", sheetName: "通知配置", headers: ["配置项", "配置值"], rows: notificationRows })}><Download />导出 Excel</Button></CardAction></CardHeader>
            <CardContent className="px-0"><Table><TableBody>{notificationRows.map(([item, value]) => <TableRow key={item}><TableCell className="w-52 font-medium text-foreground">{item}</TableCell><TableCell>{value}</TableCell></TableRow>)}</TableBody></Table></CardContent>
          </Card>

          <Card>
            <CardHeader><CardTitle className="flex items-center gap-2"><Users className="size-5 text-primary" />登录角色来源</CardTitle><CardDescription>角色及权限由统一权限模块维护</CardDescription></CardHeader>
            <CardContent className="space-y-4"><div className="rounded-xl bg-brand-soft p-4 text-sm leading-6 text-primary">运维前端不提供角色或权限配置功能。登录成功后只读取统一认证返回的 <code className="rounded bg-white/70 px-1.5 py-0.5 font-mono text-xs">role_code</code>，用于适配业务团队、模型团队和管理员三种界面。</div><div className="grid grid-cols-3 gap-3">{[["业务团队", "business / business_team"], ["模型团队", "developer / model_team"], ["管理员", "admin"]].map(([label, code]) => <div className="rounded-xl border border-border p-4" key={label}><b className="block text-sm text-foreground">{label}</b><small className="mt-1 block font-mono text-xs text-muted-foreground">{code}</small></div>)}</div><p className="text-xs leading-5 text-muted-foreground">服务端授权和权限管理由独立模块负责；本页不保存、不修改任何权限数据。</p></CardContent>
          </Card>
        </div>

        <Card>
          <CardHeader className="border-b border-border"><CardTitle>报告时间维度与输出日期</CardTitle><CardDescription>按银行单独配置，不强制统一为每月 15 日</CardDescription><CardAction className="flex items-end gap-2"><FilterSelect className="w-44" label="选择银行" value={selectedBank} allLabel="请选择" options={Object.keys(bankConfigs)} onChange={setSelectedBank} /><Button variant="outline" size="xs" onClick={() => void exportRowsToExcel({ fileName: "报告周期配置", sheetName: "报告周期", headers: ["银行", "报告时间维度", "输出日期", "下次生成"], rows: Object.entries(bankConfigs).map(([bank, config]) => [bank, config.frequency, `每月 ${config.day} 日`, nextGeneration(config.frequency, config.day)]) })}><Download />导出 Excel</Button></CardAction></CardHeader>
          <CardContent className="grid grid-cols-3 gap-3"><FilterSelect label="报告时间维度" value={currentBankConfig.frequency} allLabel="请选择" options={["月度", "季度", "半年度", "年度"]} onChange={(frequency) => updateBankConfig({ frequency })} /><label className="flex flex-col gap-1.5"><span className="text-xs font-medium text-ink-caption">报告输出日期（每月第几日）</span><Input type="number" min="1" max="28" value={currentBankConfig.day} onChange={(event) => updateBankConfig({ day: Number(event.target.value) })} /></label><label className="flex flex-col gap-1.5"><span className="text-xs font-medium text-ink-caption">下次生成</span><Input disabled value={nextGeneration(currentBankConfig.frequency, currentBankConfig.day)} /></label></CardContent>
          <CardContent className="px-0 pt-0"><Table><TableHeader><TableRow><TableHead>银行</TableHead><TableHead>报告时间维度</TableHead><TableHead>输出日期</TableHead><TableHead>下次生成</TableHead></TableRow></TableHeader><TableBody>{Object.entries(bankConfigs).map(([bank, config]) => <TableRow data-state={bank === selectedBank ? "selected" : undefined} key={bank}><TableCell className="font-medium text-foreground">{bank}</TableCell><TableCell>{config.frequency}</TableCell><TableCell>每月 {config.day} 日</TableCell><TableCell>{nextGeneration(config.frequency, config.day)}</TableCell></TableRow>)}</TableBody></Table></CardContent>
        </Card>

        <Card>
          <CardHeader><CardTitle className="flex items-center gap-2"><Settings2 className="size-5 text-primary" />模型平台新增页面依赖</CardTitle><CardDescription>非本平台交付范围</CardDescription><CardAction><span className="rounded-full bg-muted px-2.5 py-1 text-xs text-muted-foreground">待模型平台提供</span></CardAction></CardHeader>
          <CardContent className="space-y-4"><div className="rounded-xl bg-warning-soft p-4 text-sm leading-6 text-foreground">需求明确由模型平台侧新增模型信息页面，本平台只读消费。该页面是模型大类概览、已上线模型详情和监控明细的数据底座。</div><div className="rounded-xl bg-bg-log p-5 font-mono text-xs leading-6 text-white/80">主键：银行 × 模型ID<br />字段：模型名称 / 模型版本 / 开发日期 / 开发人员 / 上线日期 / 陪跑开始日期 / 陪跑结束日期 / 最近迭代日期 / 迭代原因 / 迭代人员 / 下线日期</div></CardContent>
        </Card>
      </div>
    </section>
  );
}