/**
 * OmniCard AI (CRMmp) - 名片主独立数据统计与销售漏斗业务驱动层
 * 纯函数计算转化率、漏斗阶段折损、渠道成效矩阵与国际化
 * R31: 数字与柱状仅来自接口；失败/缺字段时归零且图表为空
 */

import { LeadEntity, OwnerPageData, OwnerPageQuery } from '../../common/types.uts';
import { fetchOwnerLeadPage } from '../../common/api.uts';
import { getCurrentLocale, getOmniText } from '../../common/locale.uts';

export type StatsPeriod = 'today' | '7d' | '30d' | 'all';

export type FunnelStep = {
  key: string;
  label: string;
  count: number;
  rate: number;
};

export type ChannelMetric = {
  source: 'nfc' | 'qr' | 'link' | 'ai_chat';
  label: string;
  leadsCount: number;
  wonCount: number;
  conversionRate: number;
};

export type StatsSummary = {
  totalLeads: number;
  hotLeads: number;
  wonLeads: number;
  overallRate: number;
};

export type StatsState = {
  period: StatsPeriod;
  summary: StatsSummary;
  funnel: FunnelStep[];
  channels: ChannelMetric[];
  loading: boolean;
  errorMessage: string;
};

export type LoadStatsApi = {
  fetchOwnerLeadPage?: (
    query: OwnerPageQuery
  ) => Promise<OwnerPageData<LeadEntity> | Record<string, unknown> | null>;
};

function isZhLocale(): boolean {
  return getCurrentLocale() === 'zh-CN';
}

export function calcConversionRate(total: number, won: number): number {
  if (total <= 0 || won <= 0) {
    return 0;
  }
  const rate = (won / total) * 100;
  return Math.round(rate * 10) / 10;
}

export function calcFunnelStepRate(currentCount: number, baseCount: number): number {
  if (baseCount <= 0 || currentCount <= 0) {
    return 0;
  }
  const rate = (currentCount / baseCount) * 100;
  return Math.round(rate * 10) / 10;
}

export function resolveStatsText(key: string): string {
  const locale = getCurrentLocale();
  if (key === 'title') {
    return isZhLocale() ? '经营与漏斗统计' : 'Pipeline & Analytics';
  }
  if (key === 'subtitle') {
    return isZhLocale() ? '全渠道商机转化与意向大盘' : 'Full-funnel lead insights & radar score';
  }
  if (key === 'empty') {
    return getOmniText(locale, 'common.empty');
  }
  if (key === 'error') {
    return getOmniText(locale, 'common.error');
  }
  if (key === 'loading') {
    return getOmniText(locale, 'common.loading');
  }
  if (key === 'retry') {
    return getOmniText(locale, 'portal.retry');
  }

  // Periods
  if (key === 'periodToday') {
    return isZhLocale() ? '今日' : 'Today';
  }
  if (key === 'period7d') {
    return isZhLocale() ? '近7天' : '7 Days';
  }
  if (key === 'period30d') {
    return isZhLocale() ? '近30天' : '30 Days';
  }
  if (key === 'periodAll') {
    return isZhLocale() ? '全部' : 'All Time';
  }

  // Funnel & Metrics
  if (key === 'metricTotal') {
    return isZhLocale() ? '潜客总量' : 'Total Leads';
  }
  if (key === 'metricHot') {
    return isZhLocale() ? '高意向商机' : 'High Intent';
  }
  if (key === 'metricWon') {
    return isZhLocale() ? '签约成交' : 'Deals Won';
  }
  if (key === 'metricRate') {
    return isZhLocale() ? '综合转化率' : 'Conversion';
  }
  if (key === 'funnelTitle') {
    return isZhLocale() ? '商机转化漏斗' : 'Pipeline Funnel';
  }
  if (key === 'channelTitle') {
    return isZhLocale() ? '获客渠道成效' : 'Acquisition Channels';
  }
  if (key === 'stepNew') {
    return isZhLocale() ? '新建线索' : 'New Leads';
  }
  if (key === 'stepHot') {
    return isZhLocale() ? '高意向' : 'Hot Intent';
  }
  if (key === 'stepContacted') {
    return isZhLocale() ? '已接洽' : 'Contacted';
  }
  if (key === 'stepWon') {
    return isZhLocale() ? '赢单成单' : 'Deals Won';
  }
  if (key === 'sourceNfc') {
    return isZhLocale() ? 'NFC 贴卡' : 'NFC Touch';
  }
  if (key === 'sourceQr') {
    return isZhLocale() ? '海报码' : 'Poster QR';
  }
  if (key === 'sourceLink') {
    return isZhLocale() ? '直链分享' : 'Direct Link';
  }
  if (key === 'sourceAi') {
    return isZhLocale() ? 'AI顾问' : 'AI Concierge';
  }

  if (key === 'liveBadge') {
    return isZhLocale() ? '实时大盘' : 'LIVE INSIGHTS';
  }
  if (key === 'healthTitle') {
    return isZhLocale() ? '潜客意向度健康度' : 'Intent Distribution';
  }
  if (key === 'tierHot') {
    return isZhLocale() ? '核心高意向 (80+)' : 'High Intent (80+)';
  }
  if (key === 'tierWarm') {
    return isZhLocale() ? '重点跟进 (50-79)' : 'Warm Leads (50-79)';
  }
  if (key === 'tierCool') {
    return isZhLocale() ? '待培育池 (<50)' : 'Cool Pool (<50)';
  }
  if (key === 'stepDescNew') {
    return isZhLocale() ? '建档接入' : 'Captured';
  }
  if (key === 'stepDescHot') {
    return isZhLocale() ? '高频互动' : 'Engaged';
  }
  if (key === 'stepDescContacted') {
    return isZhLocale() ? '方案沟通' : 'Pitched';
  }
  if (key === 'stepDescWon') {
    return isZhLocale() ? '签约成交' : 'Closed';
  }
  if (key === 'badgeTotal') {
    return isZhLocale() ? '总量' : 'TOTAL';
  }
  if (key === 'badgeHot') {
    return isZhLocale() ? '高意向' : 'HOT';
  }
  if (key === 'badgeWon') {
    return isZhLocale() ? '成交' : 'WON';
  }
  if (key === 'badgeRate') {
    return isZhLocale() ? '转化' : 'CVR';
  }
  if (key === 'funnelStages') {
    return isZhLocale() ? '四阶' : '4 STAGES';
  }

  return key;
}

function emptySummary(): StatsSummary {
  return {
    totalLeads: 0,
    hotLeads: 0,
    wonLeads: 0,
    overallRate: 0,
  };
}

export function createStatsState(): StatsState {
  return {
    period: 'all',
    summary: emptySummary(),
    funnel: [],
    channels: [],
    loading: false,
    errorMessage: '',
  };
}

/** R31: 失败或缺字段时数字归零、图表清空 */
export function resetStatsToEmpty(state: StatsState): void {
  state.summary = emptySummary();
  state.funnel = [];
  state.channels = [];
}

function parseLeadList(res: OwnerPageData<LeadEntity> | Record<string, unknown> | null): LeadEntity[] {
  if (res == null) {
    return [];
  }
  const list = (res as OwnerPageData<LeadEntity>).list;
  if (list == null || !Array.isArray(list)) {
    return [];
  }
  return list;
}

export function computeStatsFromLeads(leads: LeadEntity[], period: StatsPeriod): StatsState {
  const state = createStatsState();
  state.period = period;

  if (leads == null || leads.length === 0) {
    return state;
  }

  let totalCount = 0;
  let hotCount = 0;
  let newCount = 0;
  let contactedCount = 0;
  let wonCount = 0;

  const channelMap: Record<string, { leads: number; won: number }> = {
    nfc: { leads: 0, won: 0 },
    qr: { leads: 0, won: 0 },
    link: { leads: 0, won: 0 },
    ai_chat: { leads: 0, won: 0 },
  };

  for (let i = 0; i < leads.length; i++) {
    const item = leads[i];
    totalCount++;

    const score = item.intentScore != null ? item.intentScore : 0;
    if (item.status === 'hot' || score >= 80) {
      hotCount++;
    }
    if (item.status === 'new') {
      newCount++;
    } else if (item.status === 'contacted') {
      contactedCount++;
    } else if (item.status === 'won') {
      wonCount++;
    }

    const src = item.source != null ? item.source : 'link';
    if (channelMap[src] != null) {
      channelMap[src].leads++;
      if (item.status === 'won') {
        channelMap[src].won++;
      }
    }
  }

  state.summary.totalLeads = totalCount;
  state.summary.hotLeads = hotCount;
  state.summary.wonLeads = wonCount;
  state.summary.overallRate = calcConversionRate(totalCount, wonCount);

  state.funnel = [
    {
      key: 'new',
      label: resolveStatsText('stepNew'),
      count: totalCount,
      rate: totalCount > 0 ? 100 : 0,
    },
    {
      key: 'hot',
      label: resolveStatsText('stepHot'),
      count: hotCount,
      rate: calcFunnelStepRate(hotCount, totalCount),
    },
    {
      key: 'contacted',
      label: resolveStatsText('stepContacted'),
      count: contactedCount,
      rate: calcFunnelStepRate(contactedCount, totalCount),
    },
    {
      key: 'won',
      label: resolveStatsText('stepWon'),
      count: wonCount,
      rate: calcFunnelStepRate(wonCount, totalCount),
    },
  ];

  state.channels = [
    {
      source: 'nfc',
      label: resolveStatsText('sourceNfc'),
      leadsCount: channelMap['nfc'].leads,
      wonCount: channelMap['nfc'].won,
      conversionRate: calcConversionRate(channelMap['nfc'].leads, channelMap['nfc'].won),
    },
    {
      source: 'qr',
      label: resolveStatsText('sourceQr'),
      leadsCount: channelMap['qr'].leads,
      wonCount: channelMap['qr'].won,
      conversionRate: calcConversionRate(channelMap['qr'].leads, channelMap['qr'].won),
    },
    {
      source: 'link',
      label: resolveStatsText('sourceLink'),
      leadsCount: channelMap['link'].leads,
      wonCount: channelMap['link'].won,
      conversionRate: calcConversionRate(channelMap['link'].leads, channelMap['link'].won),
    },
    {
      source: 'ai_chat',
      label: resolveStatsText('sourceAi'),
      leadsCount: channelMap['ai_chat'].leads,
      wonCount: channelMap['ai_chat'].won,
      conversionRate: calcConversionRate(channelMap['ai_chat'].leads, channelMap['ai_chat'].won),
    },
  ];

  return state;
}

export async function loadStatsData(state: StatsState, api?: LoadStatsApi): Promise<void> {
  state.loading = true;
  state.errorMessage = '';

  const fetchPage =
    api != null && api.fetchOwnerLeadPage != null
      ? api.fetchOwnerLeadPage
      : fetchOwnerLeadPage;

  try {
    const query: OwnerPageQuery = {
      page: 1,
      size: 100,
    };
    const res = await fetchPage(query);
    const list = parseLeadList(res);
    const computed = computeStatsFromLeads(list, state.period);
    state.summary = computed.summary;
    state.funnel = computed.funnel;
    state.channels = computed.channels;
  } catch (err: unknown) {
    const msg = err instanceof Error ? err.message : String(err);
    resetStatsToEmpty(state);
    state.errorMessage = msg !== '' ? msg : resolveStatsText('error');
  } finally {
    state.loading = false;
  }
}