/*
Copyright 2022 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.
*/

/// <reference types="cypress" />

import { PollResponseEvent } from "matrix-events-sdk";

import { SynapseInstance } from "../../plugins/synapsedocker";
import { MatrixClient } from "../../global";
import Chainable = Cypress.Chainable;

const hideTimestampCSS = ".mx_MessageTimestamp { visibility: hidden !important; }";

describe("Polls", () => {
    let synapse: SynapseInstance;

    type CreatePollOptions = {
        title: string;
        options: string[];
    };
    const createPoll = ({ title, options }: CreatePollOptions) => {
        if (options.length < 2) {
            throw new Error('Poll must have at least two options');
        }
        cy.get('.mx_PollCreateDialog').within((pollCreateDialog) => {
            cy.get('#poll-topic-input').type(title);

            options.forEach((option, index) => {
                const optionId = `#pollcreate_option_${index}`;

                // click 'add option' button if needed
                if (pollCreateDialog.find(optionId).length === 0) {
                    cy.get('.mx_PollCreateDialog_addOption').scrollIntoView().click();
                }
                cy.get(optionId).scrollIntoView().type(option);
            });
        });
        cy.get('.mx_Dialog button[type="submit"]').click();
    };

    const getPollTile = (pollId: string): Chainable<JQuery> => {
        return cy.get(`.mx_EventTile[data-scroll-tokens="${pollId}"]`);
    };

    const getPollOption = (pollId: string, optionText: string): Chainable<JQuery> => {
        return getPollTile(pollId).contains('.mx_MPollBody_option .mx_StyledRadioButton', optionText);
    };

    const expectPollOptionVoteCount = (pollId: string, optionText: string, votes: number): void => {
        getPollOption(pollId, optionText).within(() => {
            cy.get('.mx_MPollBody_optionVoteCount').should('contain', `${votes} vote`);
        });
    };

    const botVoteForOption = (bot: MatrixClient, roomId: string, pollId: string, optionText: string): void => {
        getPollOption(pollId, optionText).within(ref => {
            cy.get('input[type="radio"]').invoke('attr', 'value').then(optionId => {
                const pollVote = PollResponseEvent.from([optionId], pollId).serialize();
                bot.sendEvent(
                    roomId,
                    pollVote.type,
                    pollVote.content,
                );
            });
        });
    };

    beforeEach(() => {
        cy.enableLabsFeature("feature_thread");
        cy.window().then(win => {
            win.localStorage.setItem("mx_lhs_size", "0"); // Collapse left panel for these tests
        });
        cy.startSynapse("default").then(data => {
            synapse = data;

            cy.initTestUser(synapse, "Tom");
        });
    });

    afterEach(() => {
        cy.stopSynapse(synapse);
    });

    it("Open polls can be created and voted in", () => {
        let bot: MatrixClient;
        cy.getBot(synapse, { displayName: "BotBob" }).then(_bot => {
            bot = _bot;
        });

        let roomId: string;
        cy.createRoom({}).then(_roomId => {
            roomId = _roomId;
            cy.inviteUser(roomId, bot.getUserId());
            cy.visit('/#/room/' + roomId);
            // wait until Bob joined
            cy.contains(".mx_TextualEvent", "BotBob joined the room").should("exist");
        });

        cy.openMessageComposerOptions().within(() => {
            cy.get('[aria-label="Poll"]').click();
        });

        cy.get('.mx_CompoundDialog').percySnapshotElement('Polls Composer');

        const pollParams = {
            title: 'Does the polls feature work?',
            options: ['Yes', 'No', 'Maybe'],
        };
        createPoll(pollParams);

        // Wait for message to send, get its ID and save as @pollId
        cy.contains(".mx_RoomView_body .mx_EventTile[data-scroll-tokens]", pollParams.title)
            .invoke("attr", "data-scroll-tokens").as("pollId");

        cy.get<string>("@pollId").then(pollId => {
            getPollTile(pollId).percySnapshotElement('Polls Timeline tile - no votes', { percyCSS: hideTimestampCSS });

            // Bot votes 'Maybe' in the poll
            botVoteForOption(bot, roomId, pollId, pollParams.options[2]);

            // no votes shown until I vote, check bots vote has arrived
            cy.get('.mx_MPollBody_totalVotes').should('contain', '1 vote cast');

            // vote 'Maybe'
            getPollOption(pollId, pollParams.options[2]).click('topLeft');
            // both me and bot have voted Maybe
            expectPollOptionVoteCount(pollId, pollParams.options[2], 2);

            // change my vote to 'Yes'
            getPollOption(pollId, pollParams.options[0]).click('topLeft');

            // 1 vote for yes
            expectPollOptionVoteCount(pollId, pollParams.options[0], 1);
            // 1 vote for maybe
            expectPollOptionVoteCount(pollId, pollParams.options[2], 1);

            // Bot updates vote to 'No'
            botVoteForOption(bot, roomId, pollId, pollParams.options[1]);

            // 1 vote for yes
            expectPollOptionVoteCount(pollId, pollParams.options[0], 1);
            // 1 vote for no
            expectPollOptionVoteCount(pollId, pollParams.options[0], 1);
            // 0 for maybe
            expectPollOptionVoteCount(pollId, pollParams.options[2], 0);
        });
    });

    it("displays polls correctly in thread panel", () => {
        let botBob: MatrixClient;
        let botCharlie: MatrixClient;
        cy.getBot(synapse, { displayName: "BotBob" }).then(_bot => {
            botBob = _bot;
        });
        cy.getBot(synapse, { displayName: "BotCharlie" }).then(_bot => {
            botCharlie = _bot;
        });

        let roomId: string;
        cy.createRoom({}).then(_roomId => {
            roomId = _roomId;
            cy.inviteUser(roomId, botBob.getUserId());
            cy.inviteUser(roomId, botCharlie.getUserId());
            cy.visit('/#/room/' + roomId);
            // wait until the bots joined
            cy.contains(".mx_TextualEvent", "and one other were invited and joined").should("exist");
        });

        cy.openMessageComposerOptions().within(() => {
            cy.get('[aria-label="Poll"]').click();
        });

        const pollParams = {
            title: 'Does the polls feature work?',
            options: ['Yes', 'No', 'Maybe'],
        };
        createPoll(pollParams);

        // Wait for message to send, get its ID and save as @pollId
        cy.contains(".mx_RoomView_body .mx_EventTile[data-scroll-tokens]", pollParams.title)
            .invoke("attr", "data-scroll-tokens").as("pollId");

        cy.get<string>("@pollId").then(pollId => {
            // Bob starts thread on the poll
            botBob.sendMessage(roomId, pollId, {
                body: "Hello there",
                msgtype: "m.text",
            });

            // open the thread summary
            cy.get(".mx_RoomView_body .mx_ThreadSummary").click();

            // Bob votes 'Maybe' in the poll
            botVoteForOption(botBob, roomId, pollId, pollParams.options[2]);
            // Charlie votes 'No'
            botVoteForOption(botCharlie, roomId, pollId, pollParams.options[1]);

            // no votes shown until I vote, check votes have arrived in main tl
            cy.get('.mx_RoomView_body .mx_MPollBody_totalVotes').should('contain', '2 votes cast');
            // and thread view
            cy.get('.mx_ThreadView .mx_MPollBody_totalVotes').should('contain', '2 votes cast');

            cy.get('.mx_RoomView_body').within(() => {
                // vote 'Maybe' in the main timeline poll
                getPollOption(pollId, pollParams.options[2]).click('topLeft');
                // both me and bob have voted Maybe
                expectPollOptionVoteCount(pollId, pollParams.options[2], 2);
            });

            cy.get('.mx_ThreadView').within(() => {
                // votes updated in thread view too
                expectPollOptionVoteCount(pollId, pollParams.options[2], 2);
                // change my vote to 'Yes'
                getPollOption(pollId, pollParams.options[0]).click('topLeft');
            });

            // Bob updates vote to 'No'
            botVoteForOption(botBob, roomId, pollId, pollParams.options[1]);

            // me: yes, bob: no, charlie: no
            const expectVoteCounts = () => {
                // I voted yes
                expectPollOptionVoteCount(pollId, pollParams.options[0], 1);
                // Bob and Charlie voted no
                expectPollOptionVoteCount(pollId, pollParams.options[1], 2);
                // 0 for maybe
                expectPollOptionVoteCount(pollId, pollParams.options[2], 0);
            };

            // check counts are correct in main timeline tile
            cy.get('.mx_RoomView_body').within(() => {
                expectVoteCounts();
            });
            // and in thread view tile
            cy.get('.mx_ThreadView').within(() => {
                expectVoteCounts();
            });
        });
    });
});