/*
Copyright 2020 The Matrix.org Foundation C.I.C.

Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at

    http://www.apache.org/licenses/LICENSE-2.0

Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.
*/

import React, { ChangeEvent, createRef, SyntheticEvent } from "react";

import AccessibleButton, { ButtonEvent } from "../elements/AccessibleButton";
import Field from "../elements/Field";
import DialPad from "./DialPad";
import DialPadBackspaceButton from "../elements/DialPadBackspaceButton";
import LegacyCallHandler from "../../../LegacyCallHandler";

interface IProps {
    onFinished: (dialled: boolean) => void;
}

interface IState {
    value: string;
}

export default class DialpadModal extends React.PureComponent<IProps, IState> {
    private numberEntryFieldRef: React.RefObject<Field> = createRef();

    public constructor(props: IProps) {
        super(props);
        this.state = {
            value: "",
        };
    }

    public onCancelClick = (): void => {
        this.props.onFinished(false);
    };

    public onChange = (ev: ChangeEvent<HTMLInputElement>): void => {
        this.setState({ value: ev.target.value });
    };

    public onFormSubmit = (ev: SyntheticEvent): void => {
        ev.preventDefault();
        this.onDialPress();
    };

    public onDigitPress = (digit: string, ev: ButtonEvent): void => {
        this.setState({ value: this.state.value + digit });

        // Keep the number field focused so that keyboard entry is still available.
        // However, don't focus if this wasn't the result of directly clicking on the button,
        // i.e someone using keyboard navigation.
        if (ev.type === "click") {
            this.numberEntryFieldRef.current?.focus();
        }
    };

    public onDeletePress = (ev: ButtonEvent): void => {
        if (this.state.value.length === 0) return;
        this.setState({ value: this.state.value.slice(0, -1) });

        // Keep the number field focused so that keyboard entry is still available
        // However, don't focus if this wasn't the result of directly clicking on the button,
        // i.e someone using keyboard navigation.
        if (ev.type === "click") {
            this.numberEntryFieldRef.current?.focus();
        }
    };

    public onDialPress = async (): Promise<void> => {
        LegacyCallHandler.instance.dialNumber(this.state.value);
        this.props.onFinished(true);
    };

    public render(): React.ReactNode {
        const backspaceButton = <DialPadBackspaceButton onBackspacePress={this.onDeletePress} />;

        // Only show the backspace button if the field has content
        let dialPadField;
        if (this.state.value.length !== 0) {
            dialPadField = (
                <Field
                    ref={this.numberEntryFieldRef}
                    className="mx_DialPadModal_field"
                    id="dialpad_number"
                    value={this.state.value}
                    autoFocus={true}
                    onChange={this.onChange}
                    postfixComponent={backspaceButton}
                />
            );
        } else {
            dialPadField = (
                <Field
                    ref={this.numberEntryFieldRef}
                    className="mx_DialPadModal_field"
                    id="dialpad_number"
                    value={this.state.value}
                    autoFocus={true}
                    onChange={this.onChange}
                />
            );
        }

        return (
            <div className="mx_DialPadModal">
                <div>
                    <AccessibleButton className="mx_DialPadModal_cancel" onClick={this.onCancelClick} />
                </div>
                <div className="mx_DialPadModal_header">
                    <form onSubmit={this.onFormSubmit}>{dialPadField}</form>
                </div>
                <div className="mx_DialPadModal_dialPad">
                    <DialPad
                        hasDial={true}
                        onDigitPress={this.onDigitPress}
                        onDeletePress={this.onDeletePress}
                        onDialPress={this.onDialPress}
                    />
                </div>
            </div>
        );
    }
}
