/*
Copyright 2021 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, { FormEvent } from "react";
import { MatrixClient } from "matrix-js-sdk/src/matrix";
import FocusLock from "react-focus-lock";

import { MatrixClientPeg } from "../../../MatrixClientPeg";
import MatrixClientContext from "../../../contexts/MatrixClientContext";
import { _t } from "../../../languageHandler";
import AccessibleButton from "../elements/AccessibleButton";
import { KeyBindingAction } from "../../../accessibility/KeyboardShortcuts";
import { getKeyBindingsManager } from "../../../KeyBindingsManager";

export interface IScrollableBaseState {
    canSubmit: boolean;
    title: string;
    actionLabel: string;
}

/**
 * Scrollable dialog base from Compound (Web Components).
 */
export default abstract class ScrollableBaseModal<
    TProps extends { onFinished?: (...args: any[]) => void },
    TState extends IScrollableBaseState,
> extends React.PureComponent<TProps, TState> {
    protected constructor(props: TProps) {
        super(props);
    }

    protected get matrixClient(): MatrixClient {
        // XXX: The contract on MatrixClientContext says it is only available within a LoggedInView subtree,
        // given that modals function outside the MatrixChat React tree this simulates that. We don't want to
        // use safeGet as it throwing would mean we cannot use modals whilst the user isn't logged in.
        // The longer term solution is to move our ModalManager into the React tree to inherit contexts properly.
        return MatrixClientPeg.get()!;
    }

    private onKeyDown = (e: KeyboardEvent | React.KeyboardEvent): void => {
        const action = getKeyBindingsManager().getAccessibilityAction(e);
        switch (action) {
            case KeyBindingAction.Escape:
                e.stopPropagation();
                e.preventDefault();
                this.cancel();
                break;
        }
    };

    private onCancel = (): void => {
        this.cancel();
    };

    private onSubmit = (e: MouseEvent | FormEvent): void => {
        e.stopPropagation();
        e.preventDefault();
        if (!this.state.canSubmit) return; // pretend the submit button was disabled
        this.submit();
    };

    protected abstract cancel(): void;
    protected abstract submit(): void;
    protected abstract renderContent(): React.ReactNode;

    public render(): React.ReactNode {
        return (
            <MatrixClientContext.Provider value={this.matrixClient}>
                <FocusLock
                    returnFocus={true}
                    lockProps={{
                        onKeyDown: this.onKeyDown,
                        role: "dialog",
                        ["aria-labelledby"]: "mx_CompoundDialog_title",

                        // Like BaseDialog, we'll just point this at the whole content
                        ["aria-describedby"]: "mx_CompoundDialog_content",
                    }}
                    className="mx_CompoundDialog mx_ScrollableBaseDialog"
                >
                    <div className="mx_CompoundDialog_header">
                        <h1>{this.state.title}</h1>
                        <AccessibleButton
                            onClick={this.onCancel}
                            className="mx_CompoundDialog_cancelButton"
                            aria-label={_t("Close dialog")}
                        />
                    </div>
                    <form onSubmit={this.onSubmit} className="mx_CompoundDialog_form">
                        <div className="mx_CompoundDialog_content">{this.renderContent()}</div>
                        <div className="mx_CompoundDialog_footer">
                            <AccessibleButton onClick={this.onCancel} kind="primary_outline">
                                {_t("Cancel")}
                            </AccessibleButton>
                            <AccessibleButton
                                onClick={this.onSubmit}
                                kind="primary"
                                disabled={!this.state.canSubmit}
                                type="submit"
                                element="button"
                                className="mx_Dialog_nonDialogButton"
                            >
                                {this.state.actionLabel}
                            </AccessibleButton>
                        </div>
                    </form>
                </FocusLock>
            </MatrixClientContext.Provider>
        );
    }
}
