/**
 * OmniCard AI (CRMmp) - 名片主潜客详情与跟进备忘业务驱动层
 * 拉线索详情 + 足迹分页，备忘只追加不覆盖
 */

import {
  LeadEntity,
  LeadStatus,
  OwnerPageData,
  OwnerPageQuery,
  RadarTrack,
} from '../../common/types.uts';
import {
  fetchOwnerLeadInfo,
  fetchOwnerRadarPage,
} from '../../common/api.uts';
import { httpPost } from '../../common/request.uts';
import { getCurrentLocale, getOmniText } from '../../common/locale.uts';
import { statusLabel } from './useLeads.uts';
import { formatDepth, formatLocation, formatStay } from './useRadar.uts';

export type LeadDetailCopyKey =
  | 'title'
  | 'score'
  | 'timeline'
  | 'notes'
  | 'notesPlaceholder'
  | 'save'
  | 'back'
  | 'empty'
  | 'missingId'
  | 'error'
  | 'loading'
  | 'stay'
  | 'depth';

export type LeadDetailPageOptions = {
  id?: string;
};

export type LoadDetailApi = {
  fetchOwnerLeadInfo?: (id: string | number) => Promise<LeadEntity>;
  fetchOwnerRadarPage?: (
    query: OwnerPageQuery
  ) => Promise<OwnerPageData<RadarTrack>>;
};

export type LoadDetailResult = {
  lead: LeadEntity | null;
  tracks: RadarTrack[];
  empty: boolean;
  errorMessage: string;
};

export type SaveNoteInput = {
  id: string | number;
  notes?: string;
  next: string;
  status?: LeadStatus;
};

export type SaveNoteApi = {
  httpPost?: (
    url: string,
    data: Record<string, string | number>
  ) => Promise<LeadEntity>;
  updateOwnerLeadStatus?: (
    id: string | number,
    status: LeadStatus
  ) => Promise<LeadEntity>;
};

export type LeadDetailState = {
  rawId: string;
  leadId: string | number | null;
  lead: LeadEntity | null;
  name: string;
  company: string;
  status: string;
  intentScore: number;
  existingNotes: string;
  nextNote: string;
  attachments: string[];
  tracks: RadarTrack[];
  loading: boolean;
  saving: boolean;
  empty: boolean;
  missingId: boolean;
  errorMessage: string;
};

const DEFAULT_PAGE = 1;
const DEFAULT_SIZE = 20;

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

/**
 * 页面文案：标题 / 意向 / 轨迹 / 保存走词典，缺 id 与占位走本地词典
 */
export function resolveLeadDetailText(key: LeadDetailCopyKey): string {
  const locale = getCurrentLocale();
  if (key === 'title') {
    return getOmniText(locale, 'crm.follow_up');
  }
  if (key === 'score') {
    return getOmniText(locale, 'radar.lead_score');
  }
  if (key === 'timeline') {
    return getOmniText(locale, 'radar.visitor_trace');
  }
  if (key === 'notes') {
    return getOmniText(locale, 'crm.follow_up');
  }
  if (key === 'save') {
    return getOmniText(locale, 'common.save');
  }
  if (key === 'empty') {
    return getOmniText(locale, 'common.empty');
  }
  if (key === 'error') {
    return getOmniText(locale, 'common.error');
  }
  if (key === 'loading') {
    return getOmniText(locale, 'common.loading');
  }

  const zh = isZhLocale();
  if (key === 'notesPlaceholder') {
    return zh ? '追加一条跟进备忘' : 'Add a follow-up note';
  }
  if (key === 'back') {
    return zh ? '返回列表' : 'Back to list';
  }
  if (key === 'missingId') {
    return zh ? '缺少潜客编号' : 'Lead ID is missing';
  }
  if (key === 'stay') {
    return zh ? '停留' : 'Stay';
  }
  if (key === 'depth') {
    return zh ? '滚动深度' : 'Scroll depth';
  }
  return '';
}

export function statusLabelOf(status: string): string {
  return statusLabel(status);
}

export function formatTrackStay(ms: number | null | undefined): string {
  return formatStay(ms);
}

export function formatTrackDepth(depth: number | null | undefined): string {
  return formatDepth(depth);
}

export function formatTrackPlace(country?: string, city?: string): string {
  return formatLocation(country, city);
}

/**
 * 解析为正整数。非正整数返回 null
 */
export function parseLeadId(
  raw: string | number | null | undefined
): string | number | null {
  if (raw == null) {
    return null;
  }
  if (typeof raw === 'number') {
    if (raw <= 0) {
      return null;
    }
    if (Math.floor(raw) !== raw) {
      return null;
    }
    return raw;
  }
  const text = String(raw).trim();
  if (text === '') {
    return null;
  }
  if (!/^[1-9]\d*$/.test(text)) {
    return null;
  }
  return Number(text);
}

/**
 * 拼接备忘：新内容追加在旧内容后，空输入不覆盖
 */
export function appendNote(
  existing: string | null | undefined,
  next: string | null | undefined
): string {
  const prev = existing != null ? String(existing).trim() : '';
  const extra = next != null ? String(next).trim() : '';
  if (prev === '') {
    return extra;
  }
  if (extra === '') {
    return prev;
  }
  return `${prev}\n${extra}`;
}

function readErrorMessage(err: unknown): string {
  if (err instanceof Error && err.message !== '') {
    return err.message;
  }
  return resolveLeadDetailText('error');
}

function parseTrackList(
  payload: OwnerPageData<RadarTrack> | null | undefined
): RadarTrack[] {
  if (payload == null || payload.list == null) {
    return [];
  }
  return payload.list;
}

/**
 * 拉取潜客详情与足迹。可注入 fetchOwnerLeadInfo / fetchOwnerRadarPage
 */
export async function loadDetail(
  id: string | number | null | undefined,
  api?: LoadDetailApi
): Promise<LoadDetailResult> {
  const leadId = parseLeadId(id);
  if (leadId == null) {
    return {
      lead: null,
      tracks: [],
      empty: true,
      errorMessage: '',
    };
  }

  const fetchInfo =
    api != null && api.fetchOwnerLeadInfo != null
      ? api.fetchOwnerLeadInfo
      : fetchOwnerLeadInfo;
  const fetchRadar =
    api != null && api.fetchOwnerRadarPage != null
      ? api.fetchOwnerRadarPage
      : fetchOwnerRadarPage;

  try {
    const lead = await fetchInfo(leadId);
    const visitorId = lead.visitorId != null ? String(lead.visitorId) : '';
    const radarQuery: OwnerPageQuery = {
      page: DEFAULT_PAGE,
      size: DEFAULT_SIZE,
      keyWord: visitorId,
      cardId: lead.cardId,
    };
    try {
      const payload = await fetchRadar(radarQuery);
      const tracks = parseTrackList(payload);
      return {
        lead,
        tracks,
        empty: false,
        errorMessage: '',
      };
    } catch (radarErr) {
      return {
        lead,
        tracks: [],
        empty: false,
        errorMessage: readErrorMessage(radarErr),
      };
    }
  } catch (err) {
    return {
      lead: null,
      tracks: [],
      empty: true,
      errorMessage: readErrorMessage(err),
    };
  }
}

/**
 * 只更新 notes：POST /admin/crm/lead/update { id, notes }
 */
export async function saveNote(
  input: SaveNoteInput,
  api?: SaveNoteApi
): Promise<LeadEntity> {
  const notes = appendNote(input.notes, input.next);
  const post =
    api != null && api.httpPost != null ? api.httpPost : httpPost;
  const payload: Record<string, string | number> = {
    id: input.id,
    notes,
  };
  return post<LeadEntity>('/admin/crm/lead/update', payload);
}

export function createLeadDetailState(): LeadDetailState {
  return {
    rawId: '',
    leadId: null,
    lead: null,
    name: '',
    company: '',
    status: '',
    intentScore: 0,
    existingNotes: '',
    nextNote: '',
    attachments: [],
    tracks: [],
    loading: false,
    saving: false,
    empty: false,
    missingId: false,
    errorMessage: '',
  };
}

export function applyLeadDetailOptions(
  state: LeadDetailState,
  options: LeadDetailPageOptions | null
): boolean {
  if (options == null || options.id == null) {
    state.rawId = '';
    state.leadId = null;
    state.missingId = true;
    state.empty = true;
    return false;
  }
  const parsed = parseLeadId(options.id);
  state.rawId = String(options.id).trim();
  state.leadId = parsed;
  state.missingId = parsed == null;
  state.empty = parsed == null;
  return parsed != null;
}

function applyLeadToState(state: LeadDetailState, lead: LeadEntity): void {
  state.lead = lead;
  state.name = lead.name;
  state.company = lead.company != null ? lead.company : '';
  state.status = lead.status;
  state.intentScore = lead.intentScore;
  state.existingNotes = lead.notes != null ? lead.notes : '';
}

export function applyLoadResult(
  state: LeadDetailState,
  result: LoadDetailResult
): void {
  if (result.lead != null) {
    applyLeadToState(state, result.lead);
    state.empty = false;
    state.missingId = false;
  } else {
    state.lead = null;
    state.empty = true;
  }
  state.tracks = result.tracks;
  state.errorMessage = result.errorMessage;
}

export async function refreshLeadDetail(
  state: LeadDetailState,
  api?: LoadDetailApi
): Promise<LoadDetailResult> {
  if (state.missingId || state.leadId == null) {
    const skipped: LoadDetailResult = {
      lead: null,
      tracks: [],
      empty: true,
      errorMessage: '',
    };
    applyLoadResult(state, skipped);
    state.missingId = true;
    return skipped;
  }
  if (state.loading) {
    return {
      lead: state.lead,
      tracks: state.tracks,
      empty: state.empty,
      errorMessage: state.errorMessage,
    };
  }
  state.loading = true;
  state.errorMessage = '';
  const result = await loadDetail(state.leadId, api);
  applyLoadResult(state, result);
  state.loading = false;
  return result;
}

export async function submitLeadNote(
  state: LeadDetailState,
  api?: SaveNoteApi
): Promise<boolean> {
  if (state.leadId == null || state.saving) {
    return false;
  }
  const next = state.nextNote.trim();
  if (next === '') {
    return false;
  }
  state.saving = true;
  state.errorMessage = '';
  try {
    const saved = await saveNote(
      {
        id: state.leadId,
        notes: state.existingNotes,
        next,
        status: state.lead != null ? state.lead.status : undefined,
      },
      api
    );
    applyLeadToState(state, saved);
    state.nextNote = '';
    state.saving = false;
    return true;
  } catch (err) {
    state.saving = false;
    state.errorMessage = readErrorMessage(err);
    return false;
  }
}

export function goBackFromLeadDetail(): void {
  uni.navigateBack({
    delta: 1,
    fail: () => {
      uni.switchTab({
        url: '/pages/owner/leads',
      });
    },
  });
}