import Schema from '@/ecs/schema.js';

export default function(Component) {
  return class Inventory extends Component {

    insertMany(entities) {
      for (const [id, {slotChange}] of entities) {
        if (slotChange) {
          const {slots} = this.get(id);
          for (const slotIndex in slotChange) {
            if (false === slotChange[slotIndex]) {
              delete slots[slotIndex];
            }
            else {
              slots[slotIndex] = {
                ...slots[slotIndex],
                ...slotChange[slotIndex],
              };
            }
          }
        }
      }
      return super.insertMany(entities);
    }

    mergeDiff(original, update) {
      if (!update.slotChange) {
        return super.mergeDiff(original, update);
      }
      const slotChange = {
        ...original.slotChange,
      };
      for (const index in update.slotChange) {
        if (false === update.slotChange[index]) {
          slotChange[index] = false;
        }
        else {
          slotChange[index] = {
            ...slotChange[index],
            ...update.slotChange[index],
          };
        }
      }
      return {slotChange};
    }
    instanceFromSchema() {
      const Instance = super.instanceFromSchema();
      const Component = this;
      Instance.prototype.item = function (slot) {
        const {slots} = this;
        if (!(slot in slots)) {
          return undefined;
        }
        const instance = this;
        const proxy = new Proxy(slots[slot], {
          set(target, property, value) {
            target[property] = value;
            if ('qty' === property && value <= 0) {
              Component.markChange(instance.entity, 'slotChange', {[slot]: false});
            }
            else {
              Component.markChange(instance.entity, 'slotChange', {[slot]: {[property]: value}});
            }
            return true;
          },
        });
        return proxy;
      };
      return Instance;
    }
    static schema = new Schema({
      type: 'object',
      properties: {
        slots: {
          type: 'map',
          value: {
            type: 'object',
            properties: {
              quantity: {type: 'uint16'},
              source: {type: 'string'},
            },
          },
        },
      },
    });
  }
}