/*
Copyright 2020 - 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 from "react";
import { Capability, isTimelineCapability, Widget, WidgetEventCapability, WidgetKind } from "matrix-widget-api";
import { lexicographicCompare } from "matrix-js-sdk/src/utils";

import BaseDialog from "./BaseDialog";
import { _t } from "../../../languageHandler";
import { objectShallowClone } from "../../../utils/objects";
import StyledCheckbox from "../elements/StyledCheckbox";
import DialogButtons from "../elements/DialogButtons";
import LabelledToggleSwitch from "../elements/LabelledToggleSwitch";
import { CapabilityText } from "../../../widgets/CapabilityText";

interface IProps {
    requestedCapabilities: Set<Capability>;
    widget: Widget;
    widgetKind: WidgetKind; // TODO: Refactor into the Widget class
    onFinished(result?: { approved: Capability[]; remember: boolean }): void;
}

type BooleanStates = Partial<{
    [capability in Capability]: boolean;
}>;

interface IState {
    booleanStates: BooleanStates;
    rememberSelection: boolean;
}

export default class WidgetCapabilitiesPromptDialog extends React.PureComponent<IProps, IState> {
    private eventPermissionsMap = new Map<Capability, WidgetEventCapability>();

    public constructor(props: IProps) {
        super(props);

        const parsedEvents = WidgetEventCapability.findEventCapabilities(this.props.requestedCapabilities);
        parsedEvents.forEach((e) => this.eventPermissionsMap.set(e.raw, e));

        const states: BooleanStates = {};
        this.props.requestedCapabilities.forEach((c) => (states[c] = true));

        this.state = {
            booleanStates: states,
            rememberSelection: true,
        };
    }

    private onToggle = (capability: Capability): void => {
        const newStates = objectShallowClone(this.state.booleanStates);
        newStates[capability] = !newStates[capability];
        this.setState({ booleanStates: newStates });
    };

    private onRememberSelectionChange = (newVal: boolean): void => {
        this.setState({ rememberSelection: newVal });
    };

    private onSubmit = async (): Promise<void> => {
        this.closeAndTryRemember(
            Object.entries(this.state.booleanStates)
                .filter(([_, isSelected]) => isSelected)
                .map(([cap]) => cap),
        );
    };

    private onReject = async (): Promise<void> => {
        this.closeAndTryRemember([]); // nothing was approved
    };

    private closeAndTryRemember(approved: Capability[]): void {
        this.props.onFinished({ approved, remember: this.state.rememberSelection });
    }

    public render(): React.ReactNode {
        // We specifically order the timeline capabilities down to the bottom. The capability text
        // generation cares strongly about this.
        const orderedCapabilities = Object.entries(this.state.booleanStates).sort(([capA], [capB]) => {
            const isTimelineA = isTimelineCapability(capA);
            const isTimelineB = isTimelineCapability(capB);

            if (!isTimelineA && !isTimelineB) return lexicographicCompare(capA, capB);
            if (isTimelineA && !isTimelineB) return 1;
            if (!isTimelineA && isTimelineB) return -1;
            if (isTimelineA && isTimelineB) return lexicographicCompare(capA, capB);

            return 0;
        });
        const checkboxRows = orderedCapabilities.map(([cap, isChecked], i) => {
            const text = CapabilityText.for(cap, this.props.widgetKind);
            const byline = text.byline ? (
                <span className="mx_WidgetCapabilitiesPromptDialog_byline">{text.byline}</span>
            ) : null;

            return (
                <div className="mx_WidgetCapabilitiesPromptDialog_cap" key={cap + i}>
                    <StyledCheckbox checked={isChecked} onChange={() => this.onToggle(cap)}>
                        {text.primary}
                    </StyledCheckbox>
                    {byline}
                </div>
            );
        });

        return (
            <BaseDialog
                className="mx_WidgetCapabilitiesPromptDialog"
                onFinished={this.props.onFinished}
                title={_t("Approve widget permissions")}
            >
                <form onSubmit={this.onSubmit}>
                    <div className="mx_Dialog_content">
                        <div className="text-muted">{_t("This widget would like to:")}</div>
                        {checkboxRows}
                        <DialogButtons
                            primaryButton={_t("Approve")}
                            cancelButton={_t("Decline All")}
                            onPrimaryButtonClick={this.onSubmit}
                            onCancel={this.onReject}
                            additive={
                                <LabelledToggleSwitch
                                    value={this.state.rememberSelection}
                                    toggleInFront={true}
                                    onChange={this.onRememberSelectionChange}
                                    label={_t("Remember my selection for this widget")}
                                />
                            }
                        />
                    </div>
                </form>
            </BaseDialog>
        );
    }
}