/**
 * OmniCard AI (CRMmp) - 门户 AI 顾问对话业务驱动层
 * 调用已有 askAiChat，空文本不发，cardId 必填
 */

import {
  AiChatMessage,
  AiChatReply,
  AiChatRequest,
  ChatMessage,
  ChatMessageType,
  ChatLeadPayload,
  SubmitLeadParams,
} from '../../common/types.uts';
import { askAiChat, submitLead } from '../../common/api.uts';
import {
  OmniLocale,
  getCurrentLocale,
  getOmniText,
  resolveDeviceLocale,
  setCurrentLocale,
} from '../../common/locale.uts';

export {
  ChatMessage,
  ChatMessageType,
  ChatLeadPayload,
  AiChatMessage,
  AiChatReply,
  AiChatRequest,
};

export type AiChatCopyKey =
  | 'title'
  | 'send'
  | 'sending'
  | 'placeholder'
  | 'empty'
  | 'leadHint'
  | 'missingCard'
  | 'inputLabel'
  | 'nameLabel'
  | 'namePlaceholder'
  | 'contactLabel'
  | 'contactPlaceholder'
  | 'submitLead'
  | 'submitting'
  | 'submittedSuccess'
  | 'leadCardTitle'
  | 'leadCardDesc'
  | 'submitFailed'
  | 'error'
  | 'statusOnline'
  | 'advisorSubtitle'
  | 'quickPricing'
  | 'quickCases'
  | 'quickServices';

export type SendChatInput = {
  cardId: string | number;
  locale?: string;
  messages: ChatMessage[];
  text: string;
};

export type AskAiChatFn = (req: AiChatRequest) => Promise<AiChatReply>;

export type SendChatApi = {
  askAiChat: AskAiChatFn;
};

export type SendChatResult = {
  sent: boolean;
  reply: AiChatReply | null;
  messages: ChatMessage[];
  shouldCollectLead: boolean;
  leadHint: string;
};

export type AiChatState = {
  cardId: string;
  locale: OmniLocale;
  draft: string;
  sending: boolean;
  messages: ChatMessage[];
  showLeadHint: boolean;
  leadHint: string;
  errorMessage: string;
};

export type AiChatPageOptions = {
  cardId?: string;
  id?: string;
  lang?: string;
  locale?: string;
};

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

function cloneMessages(messages: ChatMessage[]): ChatMessage[] {
  const next: ChatMessage[] = [];
  if (messages == null) {
    return next;
  }
  for (let i = 0; i < messages.length; i++) {
    const item = messages[i];
    const cloned: ChatMessage = {
      role: item.role,
      content: item.content,
      type: item.type != null ? item.type : 'text',
    };
    if (item.cardPayload != null) {
      cloned.cardPayload = {
        title: item.cardPayload.title,
        description: item.cardPayload.description,
        name: item.cardPayload.name,
        contact: item.cardPayload.contact,
        submitted: item.cardPayload.submitted,
        submitting: item.cardPayload.submitting,
        successMessage: item.cardPayload.successMessage,
        errorMessage: item.cardPayload.errorMessage,
      };
    }
    next.push(cloned);
  }
  return next;
}

function resolveCardId(cardId: string | number): string {
  if (cardId == null) {
    return '';
  }
  return String(cardId).trim();
}

function requestCardId(cardId: string | number): string | number {
  if (typeof cardId === 'number') {
    return cardId;
  }
  return resolveCardId(cardId);
}

function emptySendResult(messages: ChatMessage[]): SendChatResult {
  return {
    sent: false,
    reply: null,
    messages,
    shouldCollectLead: false,
    leadHint: '',
  };
}

/**
 * 页面文案：标题走 card.ai_chat，其余本地词典
 */
export function resolveAiChatText(key: AiChatCopyKey): string {
  const locale = getCurrentLocale();
  if (key === 'title') {
    return getOmniText(locale, 'card.ai_chat');
  }
  if (key === 'error') {
    return getOmniText(locale, 'common.error');
  }

  const zh = isZhLocale();
  if (key === 'send') {
    return zh ? '发送' : 'Send';
  }
  if (key === 'sending') {
    return zh ? '发送中' : 'Sending';
  }
  if (key === 'placeholder') {
    return zh ? '输入你想了解的内容' : 'Ask about this card';
  }
  if (key === 'empty') {
    return zh ? '您好，欢迎咨询。您可以了解业务介绍、服务案例或提交合作需求。' : 'Welcome! Feel free to inquire about our services, cases, or partnership.';
  }
  if (key === 'leadHint') {
    return zh
      ? '留下您的联系方式，方便进一步沟通。'
      : 'Leave your contact details so we can follow up with you.';
  }
  if (key === 'missingCard') {
    return zh ? '缺少名片标识，暂时无法对话。' : 'A card ID is required to start this chat.';
  }
  if (key === 'inputLabel') {
    return zh ? '消息' : 'Message';
  }
  if (key === 'nameLabel') {
    return zh ? '您的称呼' : 'Your Name';
  }
  if (key === 'namePlaceholder') {
    return zh ? '例如：张经理 / Alex' : 'e.g. Alex Smith';
  }
  if (key === 'contactLabel') {
    return zh ? '联系方式' : 'Contact (WhatsApp / Email)';
  }
  if (key === 'contactPlaceholder') {
    return zh ? 'WhatsApp 或 电子邮箱' : 'WhatsApp or Email';
  }
  if (key === 'submitLead') {
    return zh ? '提交需求' : 'Submit Request';
  }
  if (key === 'submitting') {
    return zh ? '提交中' : 'Submitting';
  }
  if (key === 'submittedSuccess') {
    return zh
      ? '信息已提交，我们将尽快与您联系。'
      : 'Information received. We will get in touch shortly.';
  }
  if (key === 'leadCardTitle') {
    return zh ? '获取方案与报价' : 'Proposal & Pricing';
  }
  if (key === 'leadCardDesc') {
    return zh
      ? '请留下您的联系方式，商务人员将尽快与您对接。'
      : 'Leave your contact info and our team will get in touch.';
  }
  if (key === 'submitFailed') {
    return zh ? '提交失败，请重试' : 'Submission failed, please retry';
  }
  if (key === 'statusOnline') {
    return zh ? '在线' : 'Online';
  }
  if (key === 'advisorSubtitle') {
    return zh ? '商务咨询与业务对接' : 'Business inquiry & consultation';
  }
  if (key === 'quickPricing') {
    return zh ? '产品方案与报价' : 'Pricing & Plans';
  }
  if (key === 'quickCases') {
    return zh ? '客户案例' : 'Client Cases';
  }
  if (key === 'quickServices') {
    return zh ? '核心服务能力' : 'Core Capabilities';
  }
  return '';
}

export function createAiChatState(): AiChatState {
  return {
    cardId: '',
    locale: getCurrentLocale(),
    draft: '',
    sending: false,
    messages: [],
    showLeadHint: false,
    leadHint: '',
    errorMessage: '',
  };
}

/**
 * 从页面 query 写入 cardId / lang
 */
export function applyAiChatOptions(
  state: AiChatState,
  options: AiChatPageOptions | null
): boolean {
  let cardIdRaw = options != null ? options.cardId || options.id || '' : '';
  if (String(cardIdRaw).trim() === '') {
    try {
      const stored = uni.getStorageSync('omnicard_active_card_id');
      if (stored != null && String(stored).trim() !== '') {
        cardIdRaw = String(stored).trim();
      } else {
        cardIdRaw = '1001';
      }
    } catch (_e) {
      cardIdRaw = '1001';
    }
  }
  const langRaw = options != null ? options.lang || options.locale || '' : '';
  state.cardId = String(cardIdRaw).trim();

  if (langRaw.trim() !== '') {
    const locale = resolveDeviceLocale(langRaw);
    setCurrentLocale(locale);
    state.locale = locale;
  } else {
    state.locale = getCurrentLocale();
  }

  return state.cardId !== '';
}

export function buildUserMessage(text: string): ChatMessage {
  const content = text != null ? text.trim() : '';
  return {
    role: 'user',
    content,
    type: 'text',
  };
}

/**
 * 追加一轮 user + assistant，返回新数组
 */
export function appendTurn(
  messages: ChatMessage[],
  userText: string,
  reply: AiChatReply
): ChatMessage[] {
  const next = cloneMessages(messages);
  next.push(buildUserMessage(userText));
  const replyText = reply != null && reply.reply != null ? reply.reply : '';
  next.push({
    role: 'assistant',
    content: replyText,
    type: 'text',
  });
  return next;
}

/**
 * 发送顾问对话。空文本不发，cardId 必填。可注入 askAiChat
 */
export async function sendChat(
  input: SendChatInput,
  api?: SendChatApi
): Promise<SendChatResult> {
  const text = input != null && input.text != null ? input.text.trim() : '';
  const cardId = input != null ? resolveCardId(input.cardId) : '';
  const existing = input != null && input.messages != null ? input.messages : [];

  if (text === '' || cardId === '') {
    return emptySendResult(existing);
  }

  const outgoing = cloneMessages(existing);
  outgoing.push(buildUserMessage(text));

  const req: AiChatRequest = {
    cardId: requestCardId(input.cardId),
    messages: outgoing,
  };
  const locale = input.locale != null ? input.locale.trim() : '';
  if (locale !== '') {
    req.locale = locale;
  }

  const ask = api != null ? api.askAiChat : askAiChat;
  const reply = await ask(req);
  const shouldCollectLead = reply != null && reply.shouldCollectLead === true;

  return {
    sent: true,
    reply,
    messages: appendTurn(existing, text, reply),
    shouldCollectLead,
    leadHint: shouldCollectLead ? resolveAiChatText('leadHint') : '',
  };
}

/**
 * 页面发送：写入会话并给出留资引导标记
 */
export async function sendDraft(
  state: AiChatState,
  api?: SendChatApi
): Promise<SendChatResult> {
  if (state.sending) {
    return emptySendResult(state.messages);
  }

  state.sending = true;
  state.errorMessage = '';

  try {
    const result = await sendChat(
      {
        cardId: state.cardId,
        locale: state.locale,
        messages: state.messages,
        text: state.draft,
      },
      api
    );
    if (result.sent) {
      state.draft = '';
      state.messages = result.messages;
      state.showLeadHint = result.shouldCollectLead;
      state.leadHint = result.leadHint;
    }
    state.sending = false;
    return result;
  } catch (_e) {
    state.sending = false;
    state.errorMessage = resolveAiChatText('error');
    return emptySendResult(state.messages);
  }
}

/**
 * 意向词检测算法（如“价格”, "报价", "合作", "buy", "quote", "price"）
 */
export function hasLeadIntent(text: string): boolean {
  if (text == null || text.trim() === '') {
    return false;
  }
  const pattern = /价格|报价|多少钱|合作|联系|购买|buy|quote|price|pricing|cost|partner|cooperat|contact|order|purchase/i;
  return pattern.test(text);
}

/**
 * 模拟流式推送
 */
export async function sendStreamMessage(
  prompt: string,
  onChunk: (chunk: string) => void,
  onComplete: () => void,
  intervalMs: number = 20
): Promise<void> {
  if (prompt == null || prompt.trim() === '') {
    return;
  }
  const trimmed = prompt.trim();
  const isIntent = hasLeadIntent(trimmed);
  const zh = isZhLocale();

  let fullReply = '';
  if (isIntent) {
    fullReply = zh
      ? '关于方案与合作细节，已为您准备相关资料。请在下方填写您的联系方式，我们将尽快与您对接。'
      : 'For pricing and partnership details, we have tailored options. Please leave your details below to receive our pricing sheet.';
  } else {
    fullReply = zh
      ? '您好，欢迎咨询。您可以了解业务介绍、服务案例或提交合作需求，我们将尽快与您联系。'
      : 'Welcome! I can introduce the profile, business blocks, and our capabilities. Feel free to ask.';
  }

  const step = 3;
  for (let i = 0; i < fullReply.length; i += step) {
    const chunk = fullReply.slice(i, i + step);
    if (intervalMs > 0) {
      await new Promise<void>((resolve) => setTimeout(resolve, intervalMs));
    }
    onChunk(chunk);
  }
  onComplete();
}

/**
 * 留资卡片负载生成
 */
export function createLeadCardPayload(locale?: string): ChatLeadPayload {
  const loc = locale != null && locale !== '' ? locale : getCurrentLocale();
  const zh = loc.startsWith('zh');
  return {
    title: zh ? '获取方案与报价' : 'Proposal & Pricing',
    description: zh
      ? '请留下您的联系方式，商务人员将尽快与您对接。'
      : 'Leave your contact info and our team will get in touch.',
    name: '',
    contact: '',
    submitted: false,
    submitting: false,
    errorMessage: '',
    successMessage: '',
  };
}

/**
 * 创建留资卡片消息
 */
export function createLeadCardMessage(locale?: string): ChatMessage {
  return {
    role: 'assistant',
    content: '',
    type: 'lead_card',
    cardPayload: createLeadCardPayload(locale),
  };
}

/**
 * 模拟流式对话发送
 */
export async function sendStreamChat(
  state: AiChatState,
  text?: string,
  options?: { intervalMs?: number }
): Promise<boolean> {
  if (state.sending) {
    return false;
  }
  const rawText = text != null ? text : state.draft;
  const prompt = rawText != null ? rawText.trim() : '';
  if (prompt === '' || state.cardId === '') {
    return false;
  }

  state.sending = true;
  state.draft = '';
  state.errorMessage = '';

  // 1. 用户消息
  const userMsg: ChatMessage = {
    role: 'user',
    content: prompt,
    type: 'text',
  };
  state.messages.push(userMsg);

  // 2. 意向检测
  const isIntent = hasLeadIntent(prompt);

  // 3. 初始 assistant 消息
  const assistantMsg: ChatMessage = {
    role: 'assistant',
    content: '',
    type: 'text',
  };
  state.messages.push(assistantMsg);

  // 4. 流式推送
  const intervalMs = options != null && options.intervalMs != null ? options.intervalMs : 20;
  await sendStreamMessage(
    prompt,
    (chunk: string) => {
      assistantMsg.content += chunk;
    },
    () => {},
    intervalMs
  );

  // 5. 命中意向词时自动追加留资卡片
  if (isIntent) {
    state.messages.push(createLeadCardMessage(state.locale));
    state.showLeadHint = true;
    state.leadHint = resolveAiChatText('leadHint');
  }

  state.sending = false;
  return true;
}

export type SubmitLeadApi = {
  submitLead: (params: SubmitLeadParams) => Promise<unknown>;
};

/**
 * 提交留资卡片线索
 */
export async function submitLeadCard(
  cardId: string | number,
  payload: ChatLeadPayload,
  api?: SubmitLeadApi
): Promise<boolean> {
  if (payload == null) {
    return false;
  }
  const name = payload.name != null ? payload.name.trim() : '';
  const contact = payload.contact != null ? payload.contact.trim() : '';
  if (name === '' || contact === '') {
    return false;
  }

  payload.submitting = true;
  payload.errorMessage = '';

  const submitFn = api != null ? api.submitLead : submitLead;

  try {
    const isEmail = contact.includes('@');
    const params: SubmitLeadParams = {
      cardId,
      name,
      source: 'ai_chat',
      notes: 'AI顾问留资卡片线索',
    };
    if (isEmail) {
      params.email = contact;
    } else {
      params.phone = contact;
    }

    await submitFn(params);
    payload.submitted = true;
    payload.submitting = false;
    payload.successMessage = resolveAiChatText('submittedSuccess');
    return true;
  } catch (_e) {
    payload.submitting = false;
    payload.errorMessage = resolveAiChatText('submitFailed');
    return false;
  }
}