/*
 This file is part of GNU Taler
 (C) 2021-2023 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 {
  Amounts,
  MerchantTemplateContractDetails,
} from "@gnu-taler/taler-util";
import { useTranslationContext } from "@gnu-taler/web-util/lib/index.browser";
import { h, VNode } from "preact";
import { useState } from "preact/hooks";
import { AsyncButton } from "../../../../components/exception/AsyncButton.js";
import {
  FormErrors,
  FormProvider,
} from "../../../../components/form/FormProvider.js";
import { Input } from "../../../../components/form/Input.js";
import { InputCurrency } from "../../../../components/form/InputCurrency.js";
import { InputDuration } from "../../../../components/form/InputDuration.js";
import { InputNumber } from "../../../../components/form/InputNumber.js";
import { InputSelector } from "../../../../components/form/InputSelector.js";
import { InputWithAddon } from "../../../../components/form/InputWithAddon.js";
import { useBackendContext } from "../../../../context/backend.js";
import { MerchantBackend } from "../../../../declaration.js";
import {
  isBase32RFC3548Charset,
  randomBase32Key,
} from "../../../../utils/crypto.js";
import { undefinedIfEmpty } from "../../../../utils/table.js";

type Entity = MerchantBackend.Template.TemplateAddDetails;

interface Props {
  onCreate: (d: Entity) => Promise<void>;
  onBack?: () => void;
}

const algorithms = [0, 1, 2];
const algorithmsNames = ["off", "30s 8d TOTP-SHA1", "30s 8d eTOTP-SHA1"];

export function CreatePage({ onCreate, onBack }: Props): VNode {
  const { i18n } = useTranslationContext();
  const backend = useBackendContext();

  const [showKey, setShowKey] = useState(false);
  const [state, setState] = useState<Partial<Entity>>({
    template_contract: {
      minimum_age: 0,
      pay_duration: {
        d_us: 1000 * 1000 * 60 * 30, //30 min
      },
    },
  });

  const parsedPrice = !state.template_contract?.amount
    ? undefined
    : Amounts.parse(state.template_contract?.amount);

  const errors: FormErrors<Entity> = {
    template_id: !state.template_id ? i18n.str`should not be empty` : undefined,
    template_description: !state.template_description
      ? i18n.str`should not be empty`
      : undefined,
    template_contract: !state.template_contract
      ? undefined
      : undefinedIfEmpty({
          amount: !state.template_contract?.amount
            ? undefined
            : !parsedPrice
            ? i18n.str`not valid`
            : Amounts.isZero(parsedPrice)
            ? i18n.str`must be greater than 0`
            : undefined,
          minimum_age:
            state.template_contract.minimum_age < 0
              ? i18n.str`should be greater that 0`
              : undefined,
          pay_duration: !state.template_contract.pay_duration
            ? i18n.str`can't be empty`
            : state.template_contract.pay_duration.d_us === "forever"
            ? undefined
            : state.template_contract.pay_duration.d_us < 1000 * 1000 //less than one second
            ? i18n.str`to short`
            : undefined,
        } as Partial<MerchantTemplateContractDetails>),
    pos_key: !state.pos_key
      ? !state.pos_algorithm
        ? undefined
        : i18n.str`required`
      : !isBase32RFC3548Charset(state.pos_key)
      ? i18n.str`just letters and numbers from 2 to 7`
      : state.pos_key.length !== 32
      ? i18n.str`size of the key should be 32`
      : undefined,
  };

  const hasErrors = Object.keys(errors).some(
    (k) => (errors as any)[k] !== undefined,
  );

  const submitForm = () => {
    if (hasErrors) return Promise.reject();
    return onCreate(state as any);
  };

  return (
    <div>
      <section class="section is-main-section">
        <div class="columns">
          <div class="column" />
          <div class="column is-four-fifths">
            <FormProvider
              object={state}
              valueHandler={setState}
              errors={errors}
            >
              <InputWithAddon<Entity>
                name="template_id"
                addonBefore={`${backend.url}/instances/templates/`}
                label={i18n.str`Identifier`}
                tooltip={i18n.str`Name of the template in URLs.`}
              />
              <Input<Entity>
                name="template_description"
                label={i18n.str`Description`}
                help=""
                tooltip={i18n.str`Describe what this template stands for`}
              />
              <Input
                name="template_contract.summary"
                inputType="multiline"
                label={i18n.str`Fixed summary`}
                tooltip={i18n.str`If specified, this template will create order with the same summary`}
              />
              <InputCurrency
                name="template_contract.amount"
                label={i18n.str`Fixed price`}
                tooltip={i18n.str`If specified, this template will create order with the same price`}
              />
              <InputNumber
                name="template_contract.minimum_age"
                label={i18n.str`Minimum age`}
                help=""
                tooltip={i18n.str`Is this contract restricted to some age?`}
              />
              <InputDuration
                name="template_contract.pay_duration"
                label={i18n.str`Payment timeout`}
                help=""
                tooltip={i18n.str`How much time has the customer to complete the payment once the order was created.`}
              />
              <InputSelector<Entity>
                name="pos_algorithm"
                label={i18n.str`Verification algorithm`}
                tooltip={i18n.str`Algorithm to use to verify transaction in offline mode`}
                values={algorithms}
                toStr={(v) => algorithmsNames[v]}
                fromStr={(v) => Number(v)}
              />
              {state.pos_algorithm && state.pos_algorithm > 0 ? (
                <InputWithAddon<Entity>
                  name="pos_key"
                  label={i18n.str`Point-of-sale key`}
                  inputType={showKey ? "text" : "password"}
                  help="Be sure to be very hard to guess or use the random generator"
                  tooltip={i18n.str`Useful to validate the purchase`}
                  fromStr={(v) => v.toUpperCase()}
                  addonAfter={
                    <span class="icon">
                      {showKey ? (
                        <i class="mdi mdi-eye" />
                      ) : (
                        <i class="mdi mdi-eye-off" />
                      )}
                    </span>
                  }
                  side={
                    <span style={{ display: "flex" }}>
                      <button
                        data-tooltip={i18n.str`generate random secret key`}
                        class="button is-info mr-3"
                        onClick={(e) => {
                          const pos_key = randomBase32Key();
                          setState((s) => ({ ...s, pos_key }));
                        }}
                      >
                        <i18n.Translate>random</i18n.Translate>
                      </button>
                      <button
                        data-tooltip={
                          showKey
                            ? i18n.str`show secret key`
                            : i18n.str`hide secret key`
                        }
                        class="button is-info mr-3"
                        onClick={(e) => {
                          setShowKey(!showKey);
                        }}
                      >
                        {showKey ? (
                          <i18n.Translate>hide</i18n.Translate>
                        ) : (
                          <i18n.Translate>show</i18n.Translate>
                        )}
                      </button>
                    </span>
                  }
                />
              ) : undefined}
            </FormProvider>

            <div class="buttons is-right mt-5">
              {onBack && (
                <button class="button" onClick={onBack}>
                  <i18n.Translate>Cancel</i18n.Translate>
                </button>
              )}
              <AsyncButton
                disabled={hasErrors}
                data-tooltip={
                  hasErrors
                    ? i18n.str`Need to complete marked fields`
                    : "confirm operation"
                }
                onClick={submitForm}
              >
                <i18n.Translate>Confirm</i18n.Translate>
              </AsyncButton>
            </div>
          </div>
          <div class="column" />
        </div>
      </section>
    </div>
  );
}