/*
 This file is part of GNU Taler
 (C) 2021 Taler Systems S.A.

 GNU Taler is free software; you can redistribute it and/or modify it under the
 terms of the GNU General Public License as published by the Free Software
 Foundation; either version 3, or (at your option) any later version.

 GNU Taler 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 General Public License for more details.

 You should have received a copy of the GNU General Public License along with
 GNU Taler; see the file COPYING.  If not, see <http://www.gnu.org/licenses/>
 */

/**
*
* @author Sebastian Javier Marchano (sebasjm)
*/
import { h, VNode } from "preact";
import { useCallback, useState } from "preact/hooks";
import * as yup from 'yup';
import { MerchantBackend } from "../../declaration.js";
import { Translate, useTranslator } from "../../i18n/index.js";
import { TaxSchema as schema } from "../../schemas/index.js";
import { FormErrors, FormProvider } from "./FormProvider.js";
import { Input } from "./Input.js";
import { InputGroup } from "./InputGroup.js";
import { InputProps, useField } from "./useField.js";

export interface Props<T> extends InputProps<T> {
  isValid?: (e: any) => boolean;
}

type Entity = MerchantBackend.Tax
export function InputTaxes<T>({ name, readonly, label }: Props<keyof T>): VNode {
  const { value: taxes, onChange, } = useField<T>(name);

  const [value, valueHandler] = useState<Partial<Entity>>({})
  // const [errors, setErrors] = useState<FormErrors<Entity>>({})

  let errors: FormErrors<Entity> = {}

  try {
    schema.validateSync(value, { abortEarly: false })
  } catch (err) {
    if (err instanceof yup.ValidationError) {
      const yupErrors = err.inner as yup.ValidationError[]
      errors = yupErrors.reduce((prev, cur) => !cur.path ? prev : ({ ...prev, [cur.path]: cur.message }), {})      
    }
  }
  const hasErrors = Object.keys(errors).some(k => (errors as any)[k] !== undefined)

  const submit = useCallback((): void => {
    onChange([value as any, ...taxes] as any)
    valueHandler({})
  }, [value])

  const i18n = useTranslator()

  //FIXME: translating plural singular
  return (
    <InputGroup name="tax" label={label} alternative={taxes.length > 0 && <p>This product has {taxes.length} applicable taxes configured.</p>}>
      <FormProvider<Entity> name="tax" errors={errors} object={value} valueHandler={valueHandler} >

        <div class="field is-horizontal">
          <div class="field-label is-normal" />
          <div class="field-body" style={{ display: 'block' }}>
            {taxes.map((v: any, i: number) => <div key={i} class="tags has-addons mt-3 mb-0 mr-3" style={{ flexWrap: 'nowrap' }}>
              <span class="tag is-medium is-info mb-0" style={{ maxWidth: '90%' }}><b>{v.tax}</b>: {v.name}</span>
              <a class="tag is-medium is-danger is-delete mb-0" onClick={() => {
                onChange(taxes.filter((f: any) => f !== v) as any);
                valueHandler(v);
              }} />
            </div>
            )}
            {!taxes.length && i18n`No taxes configured for this product.`}
          </div>
        </div>

        <Input<Entity> name="tax" label={i18n`Amount`} tooltip={i18n`Taxes can be in currencies that differ from the main currency used by the merchant.`}>
          <Translate>Enter currency and value separated with a colon, e.g. "USD:2.3".</Translate>
        </Input>

        <Input<Entity> name="name" label={i18n`Description`} tooltip={i18n`Legal name of the tax, e.g. VAT or import duties.`} />

        <div class="buttons is-right mt-5">
          <button class="button is-info"
            data-tooltip={i18n`add tax to the tax list`}
            disabled={hasErrors}
            onClick={submit}><Translate>Add</Translate></button>
        </div>
      </FormProvider>
    </InputGroup>
  )
}