const mongoose = require('mongoose');

const messageSchema = new mongoose.Schema(
  {
    role: { type: String, enum: ['user', 'assistant'], required: true },
    text: { type: String, required: true },
    ts: { type: Date, default: Date.now },
    modelId: { type: String, default: null },
    inputTokens: { type: Number, default: 0 },
    outputTokens: { type: Number, default: 0 },
    /** Client-facing id for assistant replies (feedback). */
    msgId: { type: String, default: null },
    /** Thumb feedback: true = satisfied, false = not satisfied. */
    satisfied: { type: Boolean, default: null },
    feedbackAt: { type: Date, default: null },
  },
  { _id: false },
);

const webChatSessionSchema = new mongoose.Schema(
  {
    botId: { type: mongoose.Schema.Types.ObjectId, ref: 'ConciergeBot', required: true, index: true },
    eventId: { type: mongoose.Schema.Types.ObjectId, ref: 'Event' },
    organization: { type: mongoose.Schema.Types.ObjectId, ref: 'Organization' },
    sessionId: { type: String, required: true, trim: true, index: true },
    history: { type: [messageSchema], default: [] },
    lastIntent: { type: String, default: null },
    lastSeenAt: { type: Date, default: Date.now },
    endedAt: { type: Date, default: null },
    inputTokensTotal: { type: Number, default: 0 },
    outputTokensTotal: { type: Number, default: 0 },

    // Identity / OTP
    participant: {
      type: mongoose.Schema.Types.ObjectId,
      ref: 'Participant',
      default: null,
      index: true,
    },
    identityVerifiedAt: { type: Date, default: null },
    identityMethod: { type: String, default: null },
    authState: {
      type: String,
      enum: ['awaiting_email', 'awaiting_otp'],
      default: undefined,
    },
    authEmail: { type: String, trim: true, lowercase: true, default: null },
    otpHash: { type: String, default: null },
    otpExpiresAt: { type: Date, default: null },
    pendingIntent: { type: String, default: null },
    pendingMessage: { type: String, default: null },
    pendingEntities: { type: mongoose.Schema.Types.Mixed, default: null },
    /** Last session ids shown as cards — used to resolve "add it" / "yes". */
    lastSessionIds: { type: [String], default: [] },
    /** Rate-limit ticket QR emails from this chat session. */
    lastTicketEmailAt: { type: Date, default: null },
    /** Rate-limit organizer escalation emails from this chat session. */
    lastEscalationEmailAt: { type: Date, default: null },
  },
  { timestamps: true, collection: 'webchatsessions' },
);

webChatSessionSchema.index({ botId: 1, sessionId: 1 }, { unique: true });

module.exports =
  mongoose.models.WebChatSession || mongoose.model('WebChatSession', webChatSessionSchema);