<!--
  - ForeignAmountSelect.vue
  - Copyright (c) 2019 james@firefly-iii.org
  -
  - This file is part of Firefly III (https://github.com/firefly-iii).
  -
  - This program is free software: you can redistribute it and/or modify
  - it under the terms of the GNU Affero General Public License as
  - published by the Free Software Foundation, either version 3 of the
  - License, or (at your option) any later version.
  -
  - This program is distributed in the hope that it will be useful,
  - but WITHOUT ANY WARRANTY; without even the implied warranty of
  - MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  - GNU Affero General Public License for more details.
  -
  - You should have received a copy of the GNU Affero General Public License
  - along with this program.  If not, see <https://www.gnu.org/licenses/>.
  -->

<template>
  <!--
  Show if:
  - one or more currencies.
  -->
  <div v-if="this.enabledCurrencies.length >= 1" class="form-group" v-bind:class="{ 'has-error': hasError()}">
    <div class="col-sm-8 col-sm-offset-4 text-sm">
      {{ $t('form.foreign_amount') }}
    </div>
    <div class="col-sm-4">
      <select ref="currency_select" class="form-control" name="foreign_currency[]" @input="handleInput">
        <option
            v-for="currency in this.enabledCurrencies"
            :label="currency.attributes.name"
            :selected="parseInt(value.currency_id) === parseInt(currency.id)"
            :value="currency.id"

        >
          {{ currency.attributes.name }}
        </option>
      </select>
    </div>
    <div class="col-sm-8">
      <div class="input-group">
        <input v-if="this.enabledCurrencies.length > 0" ref="amount" :placeholder="this.title" :title="this.title" :value="value.amount" autocomplete="off"
               class="form-control" name="foreign_amount[]"
               step="any" type="number" @input="handleInput">
        <span class="input-group-btn">
                <button
                    class="btn btn-default"
                    tabIndex="-1"
                    type="button"
                    v-on:click="clearAmount"><i class="fa fa-trash-o"></i></button>
                </span>
      </div>
      <ul v-for="error in this.error" class="list-unstyled">
        <li class="text-danger">{{ error }}</li>
      </ul>
    </div>
  </div>
</template>

<script>
export default {
  name: "ForeignAmountSelect",

  props: ['source', 'destination', 'transactionType', 'value', 'error', 'no_currency', 'title',],
  mounted() {
    this.liability = false;
    this.loadCurrencies();

  },
  data() {
    return {
      currencies: [],
      enabledCurrencies: [],
      exclude: null,
      // liability overrules the drop down list if the source or dest is a liability
      liability: false
    }
  },
  watch: {
    source: function () {
      //console.log('ForeignAmountSelect watch source');
      this.changeData();
    },
    destination: function () {
      //console.log('ForeignAmountSelect watch destination');
      this.changeData();
    },
    transactionType: function () {
      //console.log('ForeignAmountSelect watch transaction type (is now ' + this.transactionType + ')');
      this.changeData();
    }
  },
  methods: {
    clearAmount: function () {
      this.$refs.amount.value = '';
      this.$emit('input', this.$refs.amount.value);
      // some event?
      this.$emit('clear:amount')
    },
    hasError: function () {
      //console.log('ForeignAmountSelect hasError');
      return this.error.length > 0;
    },
    handleInput(e) {
      //console.log('ForeignAmountSelect handleInput');
      let obj = {
        amount: this.$refs.amount.value,
        currency_id: this.$refs.currency_select.value,
      };
      // console.log(obj);
      this.$emit('input', obj
      );
    },
    changeData: function () {
      // console.log('ForeignAmountSelect changeData');
      this.enabledCurrencies = [];
      let destType = this.destination.type ? this.destination.type.toLowerCase() : 'invalid';
      let srcType = this.source.type ? this.source.type.toLowerCase() : 'invalid';
      let tType = this.transactionType ? this.transactionType.toLowerCase() : 'invalid';
      let liabilities = ['loan', 'debt', 'mortgage'];
      let sourceIsLiability = liabilities.indexOf(srcType) !== -1;
      let destIsLiability = liabilities.indexOf(destType) !== -1;

      // console.log(srcType + ' (source) is a liability: ' + sourceIsLiability);
      // console.log(destType + ' (dest) is a liability: ' + destIsLiability);

      if (tType === 'transfer' || destIsLiability || sourceIsLiability) {
        // console.log('Source is liability OR dest is liability, OR transfer. Lock list on currency of destination.');
        // console.log('Length of currencies is ' + this.currencies.length);
        // console.log(this.currencies);
        this.liability = true;
        // lock dropdown list on on currencyID of destination.
        for (const key in this.currencies) {
          if (this.currencies.hasOwnProperty(key) && /^0$|^[1-9]\d*$/.test(key) && key <= 4294967294) {
            // console.log('this.currencies[key].id = ' + this.currencies[key].id);
            // console.log('this.destination.currency_id = ' + this.destination.currency_id);
            if (parseInt(this.currencies[key].id) === parseInt(this.destination.currency_id)) {
              this.enabledCurrencies.push(this.currencies[key]);
            }
          }
        }
        // console.log('Enabled currencies length is now ' + this.enabledCurrencies.length);
        return;
      }

      // if type is withdrawal, list all but skip the source account ID.
      if (tType === 'withdrawal' && this.source && false === sourceIsLiability) {
        for (const key in this.currencies) {
          if (this.currencies.hasOwnProperty(key) && /^0$|^[1-9]\d*$/.test(key) && key <= 4294967294) {
            if (this.source.currency_id !== this.currencies[key].id) {
              this.enabledCurrencies.push(this.currencies[key]);
            }
          }
        }
        return;
      }

      // if type is deposit, list all but skip the source account ID.
      if (tType === 'deposit' && this.destination) {
        for (const key in this.currencies) {
          if (this.currencies.hasOwnProperty(key) && /^0$|^[1-9]\d*$/.test(key) && key <= 4294967294) {
            if (this.destination.currency_id !== this.currencies[key].id) {
              this.enabledCurrencies.push(this.currencies[key]);
            }
          }
        }
        return;
      }
      for (const key in this.currencies) {
        if (this.currencies.hasOwnProperty(key) && /^0$|^[1-9]\d*$/.test(key) && key <= 4294967294) {
          this.enabledCurrencies.push(this.currencies[key]);
        }
      }
    },
    loadCurrencies: function () {
      // reset list of currencies:
      this.currencies = [
        {
          id: 0,
          attributes: {
            name: this.no_currency,
            enabled: true
          },
        }
      ];

      this.enabledCurrencies = [
        {
          attributes: {
            name: this.no_currency,
            enabled: true
          },
          id: 0,
        }
      ];

      this.getCurrencies(1);
    },
    getCurrencies: function(page) {
      // console.log('loadCurrencies on page ' + page);
      let url = document.getElementsByTagName('base')[0].href + "api/v1/currencies?page=" + page;
      axios.get(url, {}).then((res) => {

        for (const key in res.data.data) {
          if (res.data.data.hasOwnProperty(key) && /^0$|^[1-9]\d*$/.test(key) && key <= 4294967294) {
            if (res.data.data[key].attributes.enabled) {
              // console.log(res.data.data[key].attributes);
              this.currencies.push(res.data.data[key]);
              this.enabledCurrencies.push(res.data.data[key]);
            }
          }
        }
        if(res.data.meta.pagination.current_page < res.data.meta.pagination.total_pages) {
          this.getCurrencies(res.data.meta.pagination.current_page + 1);
        }
      });
    }
  }
}
</script>
