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

const listingSchema = new Schema(
  {
    _reference: { type: String, default: () => generateId()() },
    product: { type: Schema.Types.ObjectId, ref: 'product', required: false },
    vendor: { type: Schema.Types.ObjectId, ref: 'vendor', required: true },
    stockLocation: { type: Schema.Types.ObjectId, ref: 'stockLocation', required: true },
    marketplace: { type: Schema.Types.ObjectId, ref: 'marketplace', required: true },
    title: { type: String, required: false },
    state: {
      type: {
        type: String,
        enum: ['draft', 'active', 'inactive', 'deleted', 'suspended', 'syncing'],
        default: 'draft',
      },
      message: { type: String, required: false },
    },
    url: { type: String, required: false },
    description: { type: String, required: false },
    externalReference: { type: String, required: false },
    price: { type: Number, required: false },
    currency: { type: String, required: false },
    lastSyncedAt: { type: Date, required: false },
    stockQuantity: { type: Number, required: false, default: 0 },
    condition: {
      type: String,
      enum: [
        'new',
        'likeNew',
        'newOther',
        'newWithDefects',
        'manufacturerRefurbished',
        'certifiedRefurbished',
        'excellentRefurbished',
        'veryGoodRefurbished',
        'goodRefurbished',
        'sellerRefurbished',
        'usedExcellent',
        'usedVeryGood',
        'usedGood',
        'usedAcceptable',
        'forPartsOrNotWorking',
        'preOwnedExcellent',
        'preOwnedFair',
      ],
      default: 'new',
      required: false,
    },
    courierServices: [{ type: Schema.Types.ObjectId, ref: 'courierService', required: true }],
  },
  { timestamps: true }
);

listingSchema.index({ title: 'text', url: 'text' });
listingSchema.index({ marketplace: 1, externalReference: 1 }, { unique: true, sparse: true });

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

listingSchema.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;
  },
});

const refId = (value) => value?._id ?? value;

listingSchema.statics.recalculate = async function (listing, user) {
  const listingId = refId(listing);
  if (!listingId) {
    return;
  }

  const listingVarientModel = mongoose.model('listingVarient');
  const productSkuModel = mongoose.model('productSku');
  const listingProductId = refId(listing.product);

  const findVarients = () =>
    listingVarientModel.find({ listing: listingId }).sort({ createdAt: 1 }).lean();

  let varients = await findVarients();

  if (listingProductId) {
    const productSkus = await productSkuModel
      .find({ product: listingProductId })
      .sort({ createdAt: 1 })
      .lean();

    const varientsBySkuId = new Map();
    const unmatchedVarients = [];
    for (const varient of varients) {
      const skuId = refId(varient.productSku);
      if (skuId && !varientsBySkuId.has(String(skuId))) {
        varientsBySkuId.set(String(skuId), varient);
      } else {
        unmatchedVarients.push(varient);
      }
    }

    for (const sku of productSkus) {
      const skuId = sku._id;
      const varientUpdateData = {
        product: listingProductId,
        productSku: skuId,
      };
      const existingVarient = varientsBySkuId.get(String(skuId)) || unmatchedVarients.shift();

      if (existingVarient) {
        varientsBySkuId.delete(String(skuId));
        const existingProductId = refId(existingVarient.product);
        const existingSkuId = refId(existingVarient.productSku);
        if (
          String(existingProductId) === String(listingProductId) &&
          String(existingSkuId) === String(skuId)
        ) {
          continue;
        }
        const varientResult = await editObject({
          model: listingVarientModel,
          id: existingVarient._id,
          updateData: varientUpdateData,
          user,
          recalculate: false,
        });
        if (varientResult.error) {
          throw varientResult;
        }
      } else {
        const varientResult = await newObject({
          model: listingVarientModel,
          newData: {
            ...varientUpdateData,
            listing: listingId,
            state: { type: listing.state?.type || 'draft' },
          },
          user,
          recalculate: false,
        });
        if (varientResult.error) {
          throw varientResult;
        }
      }
    }

    for (const extra of [...varientsBySkuId.values(), ...unmatchedVarients]) {
      const deleteResult = await deleteObject({
        model: listingVarientModel,
        id: extra._id,
        user,
      });
      if (deleteResult.error) {
        throw deleteResult;
      }
    }

    varients = await findVarients();
  }

  for (const varient of varients) {
    await listingVarientModel.recalculate(varient, user);
  }
};

export const listingModel = mongoose.model('listing', listingSchema);