import { useMutation, useQuery } from '@tanstack/react-query';
import {
  IconAlarm, IconArrowRight, IconBox, IconCalendar, IconClock, IconCopy,
  IconMapPin, IconSearch, IconTickCircle
} from '@douyinfe/semi-icons';
import { FormEvent, useMemo, useState } from 'react';
import { Link, useNavigate, useParams } from 'react-router-dom';
import { api } from '../../api/client';
import type { LatestTelemetryResponse, QualityIssueRow, VehicleDetail, VehicleProfileSyncItem, VehicleProfileSyncResult } from '../../api/types';
import { usePlatformSession } from '../auth/AuthGate';
import { canAdminister } from '../auth/session';
import { LIVE_QUERY_POLICY, QUERY_MEMORY } from '../queryPolicy';
import { formatTelemetryTime, formatTelemetryValue, telemetryQualityLabel } from '../domain/telemetry';
import { formatZhNumber } from '../domain/formatters';
import { parseVehicleProfileSyncCSV, vehicleProfileSyncCSVHeader } from '../domain/profileSync';
import { FleetMap } from '../map/FleetMap';
import { InlineError, PageLoading } from '../shared/AsyncState';

function fmt(value?: string) { return value?.trim() || '—'; }
function metric(value: number | undefined, fallback = '—') { return typeof value === 'number' && Number.isFinite(value) ? formatZhNumber(value, 1) : fallback; }
function timeOnly(value?: string) { if (!value) return '—'; const parts = value.split(' '); return parts[parts.length - 1] || value; }
function issueTone(issue: QualityIssueRow) { return issue.severity === 'error' ? 'error' : 'warning'; }
function durationHours(seconds?: number | null) { return seconds == null ? '—' : `${formatZhNumber(seconds / 3600, 1)} 小时`; }
function localDateTime(value?: string) { return value ? value.slice(0, 16) : ''; }
const operationStatusLabels = { unknown: '待维护', active: '运营中', inactive: '停运', maintenance: '维保中', retired: '已退役' } as const;

function ProfileSyncPanel({ onClose }: { onClose: () => void }) {
  const [sourceSystem, setSourceSystem] = useState('');
  const [sourceVersion, setSourceVersion] = useState('');
  const [conflictPolicy, setConflictPolicy] = useState<'preserve' | 'overwrite'>('preserve');
  const [items, setItems] = useState<VehicleProfileSyncItem[]>([]);
  const [fileName, setFileName] = useState('');
  const [parseError, setParseError] = useState('');
  const sync = useMutation<VehicleProfileSyncResult, Error, boolean>({
    mutationFn: (dryRun) => api.syncVehicleProfiles({ sourceSystem: sourceSystem.trim(), sourceVersion: sourceVersion.trim(), conflictPolicy, dryRun, items })
  });
  const readFile = async (file?: File) => {
    sync.reset(); setItems([]); setFileName(file?.name ?? ''); setParseError('');
    if (!file) return;
    try { setItems(parseVehicleProfileSyncCSV(await file.text())); } catch (error) { setParseError(error instanceof Error ? error.message : 'CSV 解析失败'); }
  };
  const ready = sourceSystem.trim() !== '' && sourceVersion.trim() !== '' && items.length > 0 && !sync.isPending;
  const issues = sync.data?.items.filter((item) => item.status.startsWith('conflict_') || item.status === 'missing_vehicle').slice(0, 20) ?? [];
  const applied = sync.data && !sync.data.dryRun;
  return <section className="v2-profile-sync-panel" aria-label="车辆主档批量同步">
    <header><div><strong>批量同步车辆主档</strong><p>CSV 最多 500 辆；先预演，再写入。默认保留人工档案和其他来源。</p></div><button type="button" onClick={onClose}>关闭</button></header>
    <div className="v2-profile-sync-fields">
      <label><span>来源系统标识</span><input value={sourceSystem} onChange={(event) => { setSourceSystem(event.target.value); sync.reset(); }} placeholder="例如 oem-tsp" maxLength={64} /></label>
      <label><span>来源版本</span><input value={sourceVersion} onChange={(event) => { setSourceVersion(event.target.value); sync.reset(); }} placeholder="例如 snapshot-20260714-01" maxLength={128} /></label>
      <label><span>冲突策略</span><select value={conflictPolicy} onChange={(event) => { setConflictPolicy(event.target.value as 'preserve' | 'overwrite'); sync.reset(); }}><option value="preserve">保护现有来源</option><option value="overwrite">显式覆盖现有来源</option></select></label>
      <label className="is-file"><span>CSV 文件</span><input type="file" accept=".csv,text/csv" onChange={(event) => { void readFile(event.target.files?.[0]); }} /></label>
    </div>
    <p className="v2-profile-sync-format">表头：<code>{vehicleProfileSyncCSVHeader}</code></p>
    {fileName ? <p className="v2-profile-sync-file">{fileName} · 已读取 {items.length} 辆</p> : null}
    {parseError ? <p className="v2-profile-sync-error">{parseError}</p> : null}
    {sync.isError ? <p className="v2-profile-sync-error">{sync.error.message}</p> : null}
    {sync.data ? <div className="v2-profile-sync-result">
      <div><span>收到<strong>{sync.data.received}</strong></span><span>新增<strong>{sync.data.created}</strong></span><span>更新<strong>{sync.data.updated}</strong></span><span>未变化<strong>{sync.data.unchanged}</strong></span><span>冲突<strong>{sync.data.conflicted}</strong></span><span>身份缺失<strong>{sync.data.missing}</strong></span></div>
      {issues.length ? <ul>{issues.map((item) => <li key={item.vin}><b>{item.vin}</b><span>{item.status === 'missing_vehicle' ? '网关身份不存在' : item.status === 'conflict_source_version' ? '同来源版本内容不一致' : `现有来源 ${item.previousSource || '未知'} 已保护`}</span></li>)}</ul> : <p>未发现来源冲突或身份缺失。</p>}
    </div> : null}
    {conflictPolicy === 'overwrite' ? <p className="v2-profile-sync-warning">覆盖模式会接管人工或其他系统维护的补充主档，请先确认预演结果。</p> : null}
    <footer><button type="button" onClick={() => sync.mutate(true)} disabled={!ready}>{sync.isPending ? '处理中…' : '预演同步'}</button><button className="is-primary" type="button" onClick={() => sync.mutate(false)} disabled={!ready || !sync.data?.dryRun}>{applied ? '已完成写入' : '确认写入'}</button></footer>
  </section>;
}

function VehicleSearch() {
  const navigate = useNavigate();
  const { session } = usePlatformSession();
  const [keyword, setKeyword] = useState('');
  const [syncOpen, setSyncOpen] = useState(false);
  const submit = (event: FormEvent) => {
    event.preventDefault();
    const value = keyword.trim();
    if (value) navigate(`/vehicles/${encodeURIComponent(value)}`);
  };
  return <section className={`v2-vehicle-search-page ${syncOpen ? 'has-sync-panel' : ''}`}>
    <div className="v2-vehicle-search-card">
      <span className="v2-search-hero-icon"><IconBox size="extra-large" /></span>
      <h2>查询单车数字档案</h2>
      <p>通过车牌、VIN 或终端手机号定位车辆，并查看统一身份、实时状态和来源证据。</p>
      <form onSubmit={submit}>
        <IconSearch /><input value={keyword} onChange={(event) => setKeyword(event.target.value)} placeholder="输入车牌 / VIN / 终端手机号" autoFocus />
        <button type="submit">查询车辆 <IconArrowRight /></button>
      </form>
      {canAdminister(session) ? <button className="v2-profile-sync-open" type="button" onClick={() => setSyncOpen((value) => !value)}>{syncOpen ? '收起批量同步' : '批量同步主档'}</button> : null}
    </div>
    {syncOpen ? <ProfileSyncPanel onClose={() => setSyncOpen(false)} /> : null}
  </section>;
}

function Archive({ detail, editable, onUpdated }: { detail: VehicleDetail; editable: boolean; onUpdated: () => void }) {
  const profile = detail.profile;
  const [editing, setEditing] = useState(false);
  const [draft, setDraft] = useState({ modelName: '', vehicleType: '', companyName: '', operationStatus: 'unknown', accessProvider: '', firstAccessAt: '', runtimeHours: '' });
  const save = useMutation({
    mutationFn: () => api.updateVehicleProfile(detail.vin, {
      modelName: draft.modelName.trim(), vehicleType: draft.vehicleType.trim(), companyName: draft.companyName.trim(),
      operationStatus: draft.operationStatus as NonNullable<typeof profile>['operationStatus'], accessProvider: draft.accessProvider.trim(), firstAccessAt: draft.firstAccessAt,
      runtimeSeconds: draft.runtimeHours.trim() === '' ? null : Math.round(Number(draft.runtimeHours) * 3600), version: profile?.version ?? 0
    }),
    onSuccess: () => { setEditing(false); onUpdated(); }
  });
  const startEditing = () => {
    setDraft({ modelName: profile?.modelName ?? '', vehicleType: profile?.vehicleType ?? '', companyName: profile?.companyName ?? '', operationStatus: profile?.operationStatus ?? 'unknown', accessProvider: profile?.accessProvider ?? '', firstAccessAt: localDateTime(profile?.firstAccessAt), runtimeHours: profile?.runtimeSeconds == null ? '' : String(profile.runtimeSeconds / 3600) });
    save.reset(); setEditing(true);
  };
  const submit = (event: FormEvent) => { event.preventDefault(); if (draft.runtimeHours === '' || Number.isFinite(Number(draft.runtimeHours))) save.mutate(); };
  return <section className="v2-record-card v2-archive-card">
    <header><strong>车辆主档</strong><span className="v2-profile-heading">完整度 {profile?.completeness ?? 0}%{editable && !editing ? <button type="button" onClick={startEditing}>维护档案</button> : null}</span></header>
    {editing ? <form className="v2-profile-form" onSubmit={submit}>
      <label><span>车型</span><input maxLength={128} value={draft.modelName} onChange={(event) => setDraft({ ...draft, modelName: event.target.value })} /></label>
      <label><span>车辆类型</span><input maxLength={64} value={draft.vehicleType} onChange={(event) => setDraft({ ...draft, vehicleType: event.target.value })} /></label>
      <label><span>所属企业</span><input maxLength={128} value={draft.companyName} onChange={(event) => setDraft({ ...draft, companyName: event.target.value })} /></label>
      <label><span>运营状态</span><select value={draft.operationStatus} onChange={(event) => setDraft({ ...draft, operationStatus: event.target.value })}>{Object.entries(operationStatusLabels).map(([value, label]) => <option value={value} key={value}>{label}</option>)}</select></label>
      <label><span>接入服务商</span><input maxLength={128} value={draft.accessProvider} onChange={(event) => setDraft({ ...draft, accessProvider: event.target.value })} /></label>
      <label><span>首次接入</span><input type="datetime-local" value={draft.firstAccessAt} onChange={(event) => setDraft({ ...draft, firstAccessAt: event.target.value })} /></label>
      <label><span>累计运行（小时）</span><input type="number" min="0" step="0.1" value={draft.runtimeHours} onChange={(event) => setDraft({ ...draft, runtimeHours: event.target.value })} /></label>
      {save.isError ? <p>{save.error.message}</p> : null}<footer><button type="button" onClick={() => setEditing(false)}>取消</button><button className="is-primary" type="submit" disabled={save.isPending}>{save.isPending ? '保存中' : '保存档案'}</button></footer>
    </form> : <><dl className="v2-record-list">
      <div><dt>车型 / 类型</dt><dd>{[profile?.modelName, profile?.vehicleType].filter(Boolean).join(' / ') || '—'}</dd></div>
      <div><dt>所属企业</dt><dd>{fmt(profile?.companyName)}</dd></div>
      <div><dt>运营状态</dt><dd>{operationStatusLabels[profile?.operationStatus ?? 'unknown']}</dd></div>
      <div><dt>接入服务商</dt><dd>{fmt(profile?.accessProvider)}</dd></div>
      <div><dt>首次接入</dt><dd>{fmt(profile?.firstAccessAt)}</dd></div>
      <div><dt>累计运行</dt><dd>{durationHours(profile?.runtimeSeconds)}</dd></div>
    </dl><p className="v2-record-note">身份字段来自网关；补充主档来源 {profile?.sourceSystem || '未配置'}{profile?.updatedAt ? ` · v${profile.version} · ${profile.updatedBy} 更新` : ''}</p></>}
  </section>;
}

function Events({ detail }: { detail: VehicleDetail }) {
  const events = [
    ...detail.quality.items.slice(0, 3).map((item) => ({ tone: issueTone(item), title: item.severity === 'error' ? '质量异常' : '质量提醒', detail: item.detail, time: item.lastSeen })),
    ...detail.sourceStatus.slice(0, 3).map((item) => ({ tone: item.online ? 'success' : 'muted', title: item.online ? '数据上报' : '来源离线', detail: `${item.protocol} · ${item.online ? '当前在线' : '暂无在线数据'}`, time: item.lastSeen }))
  ].slice(0, 5);
  return <section className="v2-record-card v2-events-card">
    <header><strong>最近事件</strong><Link to={`/alerts?vin=${encodeURIComponent(detail.vin)}`}>查看全部</Link></header>
    <div className="v2-event-list">{events.length ? events.map((event, index) => <div className={`v2-event-row is-${event.tone}`} key={`${event.title}-${event.time}-${index}`}>
      <span className="v2-event-icon">{event.tone === 'success' ? <IconTickCircle /> : <IconAlarm />}</span>
      <div><strong>{event.title}</strong><p>{event.detail}</p></div><time>{fmt(event.time)}</time>
    </div>) : <div className="v2-empty-compact">暂无可用事件证据</div>}</div>
  </section>;
}

function TelemetryPanel({ data, pending, error }: { data?: LatestTelemetryResponse; pending: boolean; error?: string }) {
  const [selectedCategory, setSelectedCategory] = useState('vehicle');
  const indexed = useMemo(() => {
    const valuesByCategory = new Map<string, LatestTelemetryResponse['values']>();
    const sources = new Map<string, { protocol: string; endpoint?: string }>();
    for (const value of data?.values ?? []) {
      const values = valuesByCategory.get(value.category);
      if (values) values.push(value); else valuesByCategory.set(value.category, [value]);
      const sourceKey = `${value.protocol}\u0000${value.sourceEndpoint ?? ''}`;
      if (!sources.has(sourceKey)) sources.set(sourceKey, { protocol: value.protocol, endpoint: value.sourceEndpoint });
    }
    return { valuesByCategory, sources: [...sources.values()] };
  }, [data]);
  const categories = data?.categories ?? [];
  const activeCategory = indexed.valuesByCategory.has(selectedCategory) ? selectedCategory : categories[0]?.key ?? '';
  const visibleMetrics = indexed.valuesByCategory.get(activeCategory) ?? [];
  return <section className="v2-record-card v2-telemetry-card">
    <nav>{categories.map((item) => <button className={activeCategory === item.key ? 'is-active' : ''} onClick={() => setSelectedCategory(item.key)} type="button" key={item.key}>{item.label}<span>{item.count}</span></button>)}</nav>
    <div className="v2-telemetry-list">
      {pending ? <div className="v2-empty-compact">正在读取最新遥测…</div> : error ? <div className="v2-empty-compact is-error">最新遥测不可用：{error}</div> : visibleMetrics.length ? visibleMetrics.map((item) => <div key={item.key}>
        <span>{item.label}<small title={item.sourceField}>{item.sourceField} · {item.protocol}{item.sourceEndpoint ? ` · ${item.sourceEndpoint}` : ''}</small></span>
        <strong>{formatTelemetryValue(item.value)} <em>{item.unit}</em></strong>
        <time title={`设备时间 ${item.deviceTime || '缺失'}；接收时间 ${item.serverTime || '缺失'}；${item.qualityReason}；帧 ${item.frameId}`}><i className={`is-${item.quality}`}>{telemetryQualityLabel(item.quality)}</i>{formatTelemetryTime(item.deviceTime || item.serverTime)}</time>
      </div>) : <div className="v2-empty-compact">最近 {data?.scannedFrames ?? 0} 帧没有可展示的标量遥测</div>}
    </div>
    <footer><b>来源</b>{indexed.sources.map((source) => <span key={`${source.protocol}-${source.endpoint ?? ''}`} title={source.endpoint}>{source.protocol}</span>)}<small>扫描 {data?.scannedFrames ?? 0} 帧 · 截至 {formatTelemetryTime(data?.asOf)}</small></footer>
  </section>;
}

function VehicleRecord({ detail, telemetry, telemetryPending, telemetryError, onUpdated }: { detail: VehicleDetail; telemetry?: LatestTelemetryResponse; telemetryPending: boolean; telemetryError?: string; onUpdated: () => void }) {
  const { session } = usePlatformSession();
  const realtime = detail.realtimeSummary;
  const identity = detail.identity;
  const mapVehicles = realtime ? [realtime] : [];
  const lastMileage = detail.mileage.items[0];
  return <div className="v2-vehicle-record-page">
    <section className="v2-identity-band">
      <div className="v2-identity-primary"><span className="v2-plate"><IconBox />{fmt(identity?.plate || realtime?.plate)}</span><span className={`v2-online-label ${realtime?.online ? 'is-online' : ''}`}><i />{realtime?.online ? '在线' : '离线'}</span><small>VIN</small><b>{detail.vin}</b><button type="button" title="复制 VIN" onClick={() => navigator.clipboard?.writeText(detail.vin)}><IconCopy /></button></div>
      <div className="v2-identity-meta"><div><small>接入来源</small><p>{detail.sources.map((source) => <span key={source}>{source}</span>)}</p></div><div><small>最后上报时间</small><strong>{fmt(realtime?.lastSeen || identity?.lastSeen)}</strong></div></div>
      <div className="v2-identity-actions"><Link to={`/tracks?vin=${encodeURIComponent(detail.vin)}`}><IconMapPin />轨迹回放</Link><Link to={`/history?vin=${encodeURIComponent(detail.vin)}`}><IconCalendar />历史数据</Link><Link to={`/alerts?vin=${encodeURIComponent(detail.vin)}`}><IconAlarm />告警事件</Link></div>
    </section>

    <div className="v2-record-grid">
      <section className="v2-single-map-card"><FleetMap vehicles={mapVehicles} selectedVin={detail.vin} onSelect={() => undefined} /><footer><span><IconMapPin />{realtime ? `实时坐标 ${realtime.longitude.toFixed(6)}, ${realtime.latitude.toFixed(6)}` : '暂无有效实时坐标'}{identity?.locationText ? ` · 档案区域 ${identity.locationText}` : ''}</span><time>更新时间：{fmt(realtime?.lastSeen)}</time></footer></section>
      <Archive detail={detail} editable={canAdminister(session)} onUpdated={onUpdated} />
      <section className="v2-record-card v2-live-card"><header><strong>实时指标</strong><span><IconClock />{timeOnly(realtime?.lastSeen)}</span></header><div className="v2-live-grid">
        <div><small>速度</small><strong>{metric(realtime?.speedKmh)}<em>km/h</em></strong></div><div><small>SOC</small><strong>{metric(realtime?.socPercent)}<em>%</em></strong></div><div><small>总里程</small><strong>{metric(realtime?.totalMileageKm)}<em>km</em></strong></div><div><small>当日里程</small><strong>{metric(lastMileage?.dailyMileageKm)}<em>km</em></strong></div><div><small>在线来源</small><strong>{realtime?.onlineSourceCount ?? 0}<em>个</em></strong></div><div><small>数据源总数</small><strong>{detail.sourceStatus.length}<em>个</em></strong></div>
      </div></section>
      <TelemetryPanel data={telemetry} pending={telemetryPending} error={telemetryError} />
      <Events detail={detail} />
    </div>
  </div>;
}

export default function VehiclePage() {
  const { vin } = useParams();
  const query = useQuery({ queryKey: ['vehicle-detail', vin], enabled: Boolean(vin), queryFn: ({ signal }) => api.vehicleDetail(new URLSearchParams({ keyword: vin!, limit: '20' }), signal), gcTime: QUERY_MEMORY.summaryGcTime });
  const telemetry = useQuery({ queryKey: ['vehicle-latest-telemetry', vin], enabled: Boolean(vin), queryFn: ({ signal }) => api.latestTelemetry(vin!, signal), staleTime: 10_000, gcTime: QUERY_MEMORY.summaryGcTime, refetchInterval: 20_000, ...LIVE_QUERY_POLICY });
  if (!vin) return <VehicleSearch />;
  if (query.isPending) return <PageLoading />;
  if (query.isError) return <div className="v2-page-error"><InlineError message={query.error instanceof Error ? query.error.message : '车辆档案加载失败'} onRetry={() => query.refetch()} /></div>;
  if (!query.data.lookupResolved) return <section className="v2-not-found"><IconSearch size="extra-large" /><h2>未找到车辆</h2><p>没有匹配“{vin}”的车牌、VIN 或终端记录。</p><Link to="/vehicles">重新查询</Link></section>;
  return <VehicleRecord detail={query.data} telemetry={telemetry.data} telemetryPending={telemetry.isPending} telemetryError={telemetry.isError ? (telemetry.error instanceof Error ? telemetry.error.message : '请求失败') : undefined} onUpdated={() => { void query.refetch(); void telemetry.refetch(); }} />;
}