import {Component, OnInit} from '@angular/core';
import {ApiService} from '../api.service';
import {Project} from '../models/project';
import {ActivatedRoute} from '@angular/router';

import {Chart} from 'chart.js';
import {AssignedTasks, MonitoringSnapshot} from '../models/monitoring';
import {TranslateService} from '@ngx-translate/core';
import {MessengerService} from '../messenger.service';
import {AuthService} from '../auth.service';
import {MatDialog} from '@angular/material';
import {AreYouSureComponent} from '../are-you-sure/are-you-sure.component';

import * as moment from 'moment';


@Component({
    selector: 'app-project-dashboard',
    templateUrl: './project-dashboard.component.html',
    styleUrls: ['./project-dashboard.component.css']
})
export class ProjectDashboardComponent implements OnInit {

    private projectId;
    project: Project;
    noTasks = false;

    private timeline: Chart;
    private statusPie: Chart;
    private assigneesPie: Chart;
    private avgTask: number;
    eta: string;


    private colors = {
        new: '#76FF03',
        failed: '#FF3D00',
        closed: '#E0E0E0',
        awaiting: '#FFB74D',
        random: [
            '#3D5AFE', '#2979FF', '#2196F3',
            '#7C4DFF', '#673AB7', '#7C4DFF',
            '#FFC400', '#FFD740', '#FFC107',
            '#FF3D00', '#FF6E40', '#FF5722',
            '#76FF03', '#B2FF59', '#8BC34A'
        ]
    };

    snapshots: MonitoringSnapshot[] = [];
    lastSnapshot: MonitoringSnapshot;
    assignees: AssignedTasks[];

    constructor(private apiService: ApiService,
                private route: ActivatedRoute,
                private translate: TranslateService,
                public auth: AuthService,
                public dialog: MatDialog,
                private messenger: MessengerService) {
    }

    ngOnInit(): void {
        this.route.params.subscribe(params => {
            this.projectId = params['id'];
            this.getProject();
        });
    }

    public isSafeUrl(url: string) {
        if (url.substr(0, 'http'.length) == 'http') {
            return true;
        }
    }

    public refresh() {

        this.apiService.getMonitoringSnapshots(60, this.projectId)
            .subscribe((data: any) => {
                this.snapshots = data.content.snapshots;
                this.averageTaskPerSecond();
                this.calculateEta();
                this.lastSnapshot = this.snapshots ? this.snapshots.sort((a, b) => {
                    return b.time_stamp - a.time_stamp;
                })[0] : null;

                if (this.lastSnapshot == null || (this.lastSnapshot.awaiting_verification_count == 0 &&
                    this.lastSnapshot.closed_task_count == 0 &&
                    this.lastSnapshot.new_task_count == 0 &&
                    this.lastSnapshot.failed_task_count == 0)) {
                    this.noTasks = true;
                    return;
                }
                this.noTasks = false;

                this.timeline.data.labels = this.snapshots.map(s => s.time_stamp * 1000 as any);
                this.timeline.data.datasets = this.makeTimelineDataset(this.snapshots);
                this.timeline.update();
                this.statusPie.data.datasets = [
                    {
                        label: 'Task status',
                        data: [
                            this.lastSnapshot.new_task_count,
                            this.lastSnapshot.failed_task_count,
                            this.lastSnapshot.closed_task_count,
                            this.lastSnapshot.awaiting_verification_count,
                        ],
                        backgroundColor: [
                            this.colors.new,
                            this.colors.failed,
                            this.colors.closed,
                            this.colors.awaiting
                        ],
                    }
                ];
                this.statusPie.update();

                this.apiService.getAssigneeStats(this.projectId)
                    .subscribe((data: any) => {
                        this.assignees = data.content.assignees;
                        const colors = this.assignees.map(() => {
                            return this.colors.random[Math.floor(Math.random() * this.colors.random.length)];
                        });
                        this.assigneesPie.data.labels = this.assignees.map(x => x.assignee);
                        this.assigneesPie.data.datasets = [
                            {
                                label: 'Task status',
                                data: this.assignees.map(x => x.task_count),
                                backgroundColor: colors,
                            }
                        ];
                        this.assigneesPie.update();
                    });
            });
    }

    private makeTimelineDataset(snapshots: MonitoringSnapshot[]) {
        return [
            {
                label: 'New',
                type: 'line',
                fill: false,
                borderColor: this.colors.new,
                backgroundColor: this.colors.new,
                data: snapshots.map(s => s.new_task_count),
                pointRadius: 0,
                lineTension: 0.2,
            },
            {
                label: 'Failed',
                type: 'line',
                fill: false,
                borderColor: this.colors.failed,
                backgroundColor: this.colors.failed,
                data: snapshots.map(s => s.failed_task_count),
                pointRadius: 0,
                lineTension: 0.2,
            },
            {
                label: 'Closed',
                type: 'line',
                fill: false,
                borderColor: this.colors.closed,
                backgroundColor: this.colors.closed,
                pointRadius: 0,
                data: snapshots.map(s => s.closed_task_count),
                lineTension: 0.2,
            },
            {
                label: 'Awaiting verification',
                type: 'line',
                fill: false,
                borderColor: this.colors.awaiting,
                backgroundColor: this.colors.awaiting,
                data: snapshots.map(s => s.awaiting_verification_count),
                pointRadius: 0,
                lineTension: 0.2,
            },
        ];
    }

    private setupTimeline() {
        const elem = document.getElementById('timeline') as any;
        const ctx = elem.getContext('2d');

        this.timeline = new Chart(ctx, {
            type: 'bar',
            data: {
                labels: this.snapshots.map(s => s.time_stamp * 1000 as any),
                datasets: this.makeTimelineDataset(this.snapshots),
            },
            options: {
                title: {
                    display: true,
                    text: 'Task status timeline',
                    position: 'bottom'
                },
                legend: {
                    position: 'left',
                },
                scales: {
                    xAxes: [{
                        type: 'time',
                        distribution: 'series',
                        ticks: {
                            source: 'auto'
                        },
                    }]
                },
                tooltips: {
                    enabled: true,
                    intersect: false,
                    mode: 'index',
                    position: 'nearest',
                },
                responsive: true
            }
        });
    }

    private setupStatusPie() {

        if (this.lastSnapshot == undefined || (this.lastSnapshot.awaiting_verification_count == 0 &&
            this.lastSnapshot.closed_task_count == 0 &&
            this.lastSnapshot.new_task_count == 0 &&
            this.lastSnapshot.failed_task_count == 0)) {
            this.noTasks = true;

            this.lastSnapshot = {
                closed_task_count: 0, time_stamp: 0, failed_task_count: 0,
                new_task_count: 0, awaiting_verification_count: 0
            };
        }

        const elem = document.getElementById('status-pie') as any;
        const ctx = elem.getContext('2d');

        this.statusPie = new Chart(ctx, {
            type: 'doughnut',
            data: {
                labels: [
                    'New',
                    'Failed',
                    'Closed',
                    'Awaiting verification',
                ],
                datasets: [
                    {
                        label: 'Task status',
                        data: [
                            this.lastSnapshot.new_task_count,
                            this.lastSnapshot.failed_task_count,
                            this.lastSnapshot.closed_task_count,
                            this.lastSnapshot.awaiting_verification_count,
                        ],
                        backgroundColor: [
                            this.colors.new,
                            this.colors.failed,
                            this.colors.closed,
                            this.colors.awaiting
                        ],
                    }
                ],
            },
            options: {
                responsive: true,
                legend: {
                    position: 'left',
                },
                title: {
                    display: true,
                    text: 'Current task status',
                    position: 'bottom'

                },
                animation: {
                    animateScale: true,
                    animateRotate: true
                },
            }
        });
    }

    private setupAssigneesPie() {

        const elem = document.getElementById('assignees-pie') as any;
        const ctx = elem.getContext('2d');

        const colors = this.assignees.map(() => {
            return this.colors.random[Math.floor(Math.random() * this.colors.random.length)];
        });

        this.assigneesPie = new Chart(ctx, {
            type: 'doughnut',
            data: {
                labels: this.assignees.map(x => x.assignee),
                datasets: [
                    {
                        label: 'Task status',
                        data: this.assignees.map(x => x.task_count),
                        backgroundColor: colors,
                    }
                ],
            },
            options: {
                responsive: true,
                legend: {
                    position: 'left',
                },
                title: {
                    display: true,
                    text: 'Task assignment',
                    position: 'bottom'

                },
                animation: {
                    animateScale: true,
                    animateRotate: true
                },
            }
        });
    }

    private getProject() {
        this.apiService.getProject(this.projectId).subscribe((data: any) => {
                this.project = data.content.project;

                this.apiService.getMonitoringSnapshots(60, this.projectId)
                    .subscribe((data: any) => {
                        this.snapshots = data.content.snapshots;
                        this.lastSnapshot = this.snapshots ? this.snapshots.sort((a, b) => {
                            return b.time_stamp - a.time_stamp;
                        })[0] : null;

                        this.setupTimeline();
                        this.setupStatusPie();

                        if (!this.snapshots) {
                            return;
                        }

                        this.apiService.getAssigneeStats(this.projectId)
                            .subscribe((data: any) => {
                                this.assignees = data.content.assignees;
                                this.setupAssigneesPie();
                            });

                        this.averageTaskPerSecond();
                        this.calculateEta();
                    });
            },
            error => {
                this.translate.get('messenger.unauthorized').subscribe(t =>
                    this.messenger.show(t));
            });
    }

    resetFailedTasks() {
        this.dialog.open(AreYouSureComponent, {
            width: '250px',
        }).afterClosed().subscribe(result => {
            if (result) {
                this.apiService.resetFailedTasks(this.projectId).subscribe(
                    data => {
                        this.translate.get('project.reset_response').subscribe(t =>
                            this.messenger.show(t + data['content']['affected_tasks']));
                    },
                    error => {
                        this.translate.get('messenger.unauthorized').subscribe(t =>
                            this.messenger.show(t));
                    }
                );
            }
        });
    }

    pauseProject() {
        this.setPaused(true);
    }

    resumeProject() {
        this.setPaused(false);
    }

    private averageTaskPerSecond() {

        const averageDelta = ([x, ...xs]) => {
            if (x === undefined) {
                return NaN;
            } else {
                return xs.reduce(
                    ([acc, last], x) => [acc + (x - last), x],
                    [0, x]
                ) [0] / xs.length;
            }
        };

        const interval = this.snapshots.length > 1 ? this.snapshots[0].time_stamp - this.snapshots[1].time_stamp : 0;

        if (interval != 0) {
            this.avgTask = averageDelta(this.snapshots.reverse().map(s => s.closed_task_count) as any) / interval;
        } else {
            return 0;
        }
    }

    private calculateEta() {
        if (this.snapshots.length > 0) {
            this.eta = moment.utc(this.snapshots[0].new_task_count / this.avgTask * 1000).format('D[d] HH[h]mm[m]ss[s]');
        } else {
            this.eta = 'N/A';
        }
    }

    private setPaused(paused: boolean) {
        this.dialog.open(AreYouSureComponent, {
            width: '250px',
        }).afterClosed().subscribe(result => {
            this.project.paused = paused;
            this.apiService.updateProject(this.project).subscribe(() => {
                this.translate.get('messenger.acknowledged').subscribe(t =>
                    this.messenger.show(t));
            }, error => {
                this.translate.get('messenger.unauthorized').subscribe(t =>
                    this.messenger.show(t));
            });
        });
    }

    hardReset() {

    }
}