import mongoose from 'mongoose';
import { generateId } from '../../utils.js';
import { aggregateRollups, editObject } from '../../database.js';
const { Schema } = mongoose;

const toId = (value) => {
  if (value == null) return null;
  if (typeof value === 'object' && value._id) return String(value._id);
  return String(value);
};

const listingVarientSchema = new Schema(
  {
    _reference: { type: String, default: () => generateId()() },
    listing: { type: Schema.Types.ObjectId, ref: 'listing', required: true },
    product: { type: Schema.Types.ObjectId, ref: 'product', required: false },
    productSku: { type: Schema.Types.ObjectId, ref: 'productSku', required: false },
    state: {
      type: {
        type: String,
        enum: ['draft', 'active', 'inactive', 'deleted', 'suspended', 'syncing'],
        default: 'draft',
      },
      message: { type: String, required: false },
    },
    externalReference: { type: String, required: false },
    price: { type: Number, required: false },
    currency: { type: String, required: false },
    priceTaxRate: { type: Schema.Types.ObjectId, ref: 'taxRate', required: false },
    priceWithTax: { type: Number, required: false },
    lastSyncedAt: { type: Date, required: false },
    stockQuantity: { type: Number, required: false, default: 0 },
  },
  { timestamps: true }
);

listingVarientSchema.index({ currency: 'text', 'state.type': 'text' });
listingVarientSchema.index({ listing: 1, externalReference: 1 }, { unique: true, sparse: true });

listingVarientSchema.virtual('id').get(function () {
  return this._id;
});

listingVarientSchema.set('toJSON', {
  virtuals: true,
  transform(doc, ret) {
    if (!ret.state && ret.status) {
      ret.state = { type: ret.status, message: null };
    }
    if (ret.status) delete ret.status;
    return ret;
  },
});

listingVarientSchema.statics.recalculate = async function (listingVarient, user) {
  const listingId = listingVarient?.listing?._id || listingVarient?.listing;
  const varientId = listingVarient?._id;
  const productSkuId = toId(listingVarient?.productSku);

  if (varientId && productSkuId && (await this.exists({ _id: varientId }))) {
    let listing = listingVarient.listing;
    if (!listing?.stockLocation) {
      listing = await mongoose
        .model('listing')
        .findById(listingId)
        .select('stockLocation product')
        .lean();
    }
    const stockLocationId = toId(listing?.stockLocation);
    if (stockLocationId) {
      const stockRollup = await aggregateRollups({
        model: mongoose.model('productStock'),
        baseFilter: {
          productSku: new mongoose.Types.ObjectId(productSkuId),
          stockLocation: new mongoose.Types.ObjectId(stockLocationId),
        },
        rollupConfigs: [
          {
            name: 'stockQuantity',
            rollups: [{ name: 'stockQuantity', property: 'currentQuantity', operation: 'sum' }],
          },
        ],
      });
      const stockQuantity = stockRollup.stockQuantity?.sum || 0;
      if (listingVarient.stockQuantity !== stockQuantity) {
        await editObject({
          model: this,
          id: varientId,
          updateData: { stockQuantity },
          user,
          recalculate: false,
        });
      }
    }
  }

  if (!listingId) {
    return;
  }

  const rollupResults = await aggregateRollups({
    model: this,
    baseFilter: { listing: new mongoose.Types.ObjectId(listingId) },
    rollupConfigs: [
      {
        name: 'stockQuantity',
        rollups: [{ name: 'stockQuantity', property: 'stockQuantity', operation: 'sum' }],
      },
    ],
  });

  await editObject({
    model: mongoose.model('listing'),
    id: listingId,
    updateData: {
      stockQuantity: rollupResults.stockQuantity?.sum || 0,
    },
    user,
    recalculate: false,
  });
};

export const listingVarientModel = mongoose.model('listingVarient', listingVarientSchema);