import api from '../api';

// ============================================================================
// TYPES & INTERFACES
// ============================================================================

export interface TeamsbotSession {
  id: string;
  instanceId: string;
  mandateId: string;
  meetingLink: string;
  botName: string;
  backgroundImageUrl?: string;
  status: 'pending' | 'joining' | 'active' | 'leaving' | 'ended' | 'error';
  startedAt?: string;
  endedAt?: string;
  startedByUserId: string;
  bridgeSessionId?: string;
  meetingChatId?: string;
  summary?: string;
  errorMessage?: string;
  transcriptSegmentCount: number;
  botResponseCount: number;
  creationDate?: string;
  lastModified?: string;
}

export interface TeamsbotTranscript {
  id: string;
  sessionId: string;
  speaker?: string;
  text: string;
  timestamp: string;
  confidence: number;
  language?: string;
  isFinal: boolean;
}

export interface TeamsbotBotResponse {
  id: string;
  sessionId: string;
  responseText: string;
  responseType: 'audio' | 'chat' | 'both';
  detectedIntent: 'addressed' | 'question' | 'proactive' | 'none';
  reasoning?: string;
  triggeredByTranscriptId?: string;
  modelName?: string;
  processingTime: number;
  priceCHF: number;
  timestamp?: string;
}

export type TeamsbotResponseChannel = 'voice' | 'chat' | 'both';
export type TeamsbotJoinMode = 'systemBot' | 'anonymous' | 'userAccount';

export interface TeamsbotConfig {
  botName: string;
  backgroundImageUrl?: string;
  aiSystemPrompt: string;
  responseMode: 'auto' | 'manual' | 'transcribeOnly';
  responseChannel: TeamsbotResponseChannel;
  language: string;
  voiceId?: string;
  browserBotUrl?: string;
  botAccountEmail?: string;
  botAccountPassword?: string;
  triggerIntervalSeconds: number;
  triggerCooldownSeconds: number;
  contextWindowSegments: number;
}

export interface TeamsbotSessionStats {
  transcriptSegments: number;
  botResponses: number;
  totalCostCHF: number;
  totalProcessingTime: number;
  speakers: string[];
}

export interface StartSessionRequest {
  meetingLink: string;
  botName?: string;
  backgroundImageUrl?: string;
  connectionId?: string;
  joinMode?: TeamsbotJoinMode;
}

export interface ConfigUpdateRequest {
  botName?: string;
  backgroundImageUrl?: string;
  aiSystemPrompt?: string;
  responseMode?: 'auto' | 'manual' | 'transcribeOnly';
  responseChannel?: TeamsbotResponseChannel;
  language?: string;
  voiceId?: string;
  browserBotUrl?: string;
  botAccountEmail?: string;
  botAccountPassword?: string;
  triggerIntervalSeconds?: number;
  triggerCooldownSeconds?: number;
  contextWindowSegments?: number;
}

// Voice/Language Types (from Google TTS API)
export interface VoiceLanguage {
  code: string;
  name: string;
}

export interface VoiceOption {
  name: string;
  languageCodes: string[];
  ssmlGender: string;
  naturalSampleRateHertz: number;
}

// SSE Event Types
export interface TeamsbotSSEEvent {
  type: 'transcript' | 'botResponse' | 'analysis' | 'suggestedResponse' | 'statusChange' | 'error' | 'ping' | 'sessionState';
  data: any;
  timestamp?: string;
}

// ============================================================================
// API FUNCTIONS
// ============================================================================

/**
 * Start a new Teams Bot session.
 */
export async function startSession(instanceId: string, request: StartSessionRequest): Promise<{ session: TeamsbotSession }> {
  const response = await api.post(`/api/teamsbot/${instanceId}/sessions`, request);
  return response.data;
}

/**
 * List all sessions for a feature instance.
 */
export async function listSessions(instanceId: string, includeEnded = true): Promise<{ sessions: TeamsbotSession[] }> {
  const response = await api.get(`/api/teamsbot/${instanceId}/sessions`, {
    params: { includeEnded },
  });
  return response.data;
}

/**
 * Get session details with transcripts and bot responses.
 */
export async function getSession(
  instanceId: string,
  sessionId: string,
  includeTranscripts = true,
  includeResponses = true,
): Promise<{
  session: TeamsbotSession;
  transcripts?: TeamsbotTranscript[];
  botResponses?: TeamsbotBotResponse[];
  stats?: TeamsbotSessionStats;
}> {
  const response = await api.get(`/api/teamsbot/${instanceId}/sessions/${sessionId}`, {
    params: { includeTranscripts, includeResponses },
  });
  return response.data;
}

/**
 * Stop an active session.
 */
export async function stopSession(instanceId: string, sessionId: string): Promise<{ status: string; sessionId: string }> {
  const response = await api.post(`/api/teamsbot/${instanceId}/sessions/${sessionId}/stop`);
  return response.data;
}

/**
 * Delete a session and all related data.
 */
export async function deleteSession(instanceId: string, sessionId: string): Promise<{ deleted: boolean }> {
  const response = await api.delete(`/api/teamsbot/${instanceId}/sessions/${sessionId}`);
  return response.data;
}

/**
 * Get teamsbot configuration.
 */
export async function getConfig(instanceId: string): Promise<{ config: TeamsbotConfig }> {
  const response = await api.get(`/api/teamsbot/${instanceId}/config`);
  return response.data;
}

/**
 * Update teamsbot configuration.
 */
export async function updateConfig(instanceId: string, updates: ConfigUpdateRequest): Promise<{ config: TeamsbotConfig }> {
  const response = await api.put(`/api/teamsbot/${instanceId}/config`, updates);
  return response.data;
}

/**
 * Test TTS voice with AI-generated sample text. Returns base64-encoded audio.
 */
export async function testVoice(
  instanceId: string,
  botName: string,
  language: string,
  voiceId?: string,
): Promise<{ success: boolean; audio?: string; format?: string; text?: string; error?: string }> {
  const response = await api.post(`/api/teamsbot/${instanceId}/voice/test`, {
    botName,
    language,
    voiceId,
  });
  return response.data;
}

/**
 * Fetch available TTS languages from Google Cloud.
 * Returns array of language codes (e.g. ["de-DE", "en-US", ...])
 */
export async function fetchLanguages(): Promise<string[]> {
  try {
    const response = await api.get('/voice-google/languages');
    return response.data?.languages || [];
  } catch {
    return [];
  }
}

/**
 * Fetch available TTS voices for a language from Google Cloud.
 */
export async function fetchVoices(languageCode: string): Promise<VoiceOption[]> {
  try {
    const response = await api.get('/voice-google/voices', {
      params: { languageCode },
    });
    return response.data?.voices || [];
  } catch {
    return [];
  }
}

/**
 * Create an SSE EventSource for live session streaming.
 * Returns the EventSource instance for the caller to manage.
 */
export function createSessionStream(instanceId: string, sessionId: string): EventSource {
  const baseUrl = api.defaults.baseURL || '';
  const url = `${baseUrl}/api/teamsbot/${instanceId}/sessions/${sessionId}/stream`;
  return new EventSource(url, { withCredentials: true });
}