// Copyright (c) 2015-present Mattermost, Inc. All Rights Reserved.
// See LICENSE.txt for license information.

import {Alert} from 'react-native';

import {Post} from '@constants';
import Calls from '@constants/calls';
import {isMinimumServerVersion} from '@utils/helpers';
import {displayUsername} from '@utils/user';

import type {CallParticipant, ServerCallsConfig} from '@calls/types/calls';
import type PostModel from '@typings/database/models/servers/post';
import type {IntlShape} from 'react-intl';

export function sortParticipants(teammateNameDisplay: string, participants?: Dictionary<CallParticipant>, presenterID?: string): CallParticipant[] {
    if (!participants) {
        return [];
    }

    const users = Object.values(participants);

    return users.sort(sortByName(teammateNameDisplay)).sort(sortByState(presenterID));
}

const sortByName = (teammateNameDisplay: string) => {
    return (a: CallParticipant, b: CallParticipant) => {
        const nameA = displayUsername(a.userModel, teammateNameDisplay);
        const nameB = displayUsername(b.userModel, teammateNameDisplay);
        return nameA.localeCompare(nameB);
    };
};

const sortByState = (presenterID?: string) => {
    return (a: CallParticipant, b: CallParticipant) => {
        if (a.id === presenterID) {
            return -1;
        } else if (b.id === presenterID) {
            return 1;
        }

        if (!a.muted && b.muted) {
            return -1;
        } else if (!b.muted && a.muted) {
            return 1;
        }

        if (a.raisedHand && !b.raisedHand) {
            return -1;
        } else if (b.raisedHand && !a.raisedHand) {
            return 1;
        } else if (a.raisedHand && b.raisedHand) {
            return a.raisedHand - b.raisedHand;
        }

        return 0;
    };
};

export function isSupportedServerCalls(serverVersion?: string) {
    if (serverVersion) {
        return isMinimumServerVersion(
            serverVersion,
            Calls.RequiredServer.MAJOR_VERSION,
            Calls.RequiredServer.MIN_VERSION,
            Calls.RequiredServer.PATCH_VERSION,
        );
    }

    return false;
}

export function isCallsCustomMessage(post: PostModel | Post): boolean {
    return Boolean(post.type && post.type?.startsWith(Post.POST_TYPES.CUSTOM_CALLS));
}

export function idsAreEqual(a: string[], b: string[]) {
    if (a.length !== b.length) {
        return false;
    }

    // We can assume ids are unique
    // Doing a quick search indicated objects are tuned better than Map or Set
    const obj = a.reduce((prev, cur) => {
        prev[cur] = true;
        return prev;
    }, {} as Record<string, boolean>);

    for (let i = 0; i < b.length; i++) {
        if (!obj.hasOwnProperty(b[i])) {
            return false;
        }
    }
    return true;
}

export function errorAlert(error: string, intl: IntlShape) {
    Alert.alert(
        intl.formatMessage({
            id: 'mobile.calls_error_title',
            defaultMessage: 'Error',
        }),
        intl.formatMessage({
            id: 'mobile.calls_error_message',
            defaultMessage: 'Error: {error}',
        }, {error}),
    );
}

export function getICEServersConfigs(config: ServerCallsConfig) {
    // if ICEServersConfigs is set, we can trust this to be complete and
    // coming from an updated API.
    if (config.ICEServersConfigs && config.ICEServersConfigs.length > 0) {
        return config.ICEServersConfigs;
    }

    // otherwise we revert to using the now deprecated field.
    if (config.ICEServers && config.ICEServers.length > 0) {
        return [
            {
                urls: config.ICEServers,
            },
        ];
    }

    return [];
}