import { format, getDaysInMonth } from 'date-fns';
import {
    calculateEstimatedMonthlyCost,
    calculateOverageCost,
    calculateProjectedUsage,
    calculateTotalUsage,
    cleanTrafficData,
} from './traffic-calculations.js';
import { toSelectablePeriod } from '../component/admin/network/NetworkTrafficUsage/selectable-periods.js';
import type {
    TrafficUsageDataSegmentedCombinedSchema,
    TrafficUsageDataSegmentedCombinedSchemaApiDataItem,
} from 'openapi';

const testData4Days = [
    {
        label: 'Frontend',
        data: [23_000_000, 22_000_000, 24_000_000, 21_000_000],
        backgroundColor: 'red',
        hoverBackgroundColor: 'red',
    },
    {
        label: 'Admin',
        data: [23_000_000, 22_000_000, 24_000_000, 21_000_000],
        backgroundColor: 'red',
        hoverBackgroundColor: 'red',
    },
    {
        label: 'SDK',
        data: [23_000_000, 22_000_000, 24_000_000, 21_000_000],
        backgroundColor: 'red',
        hoverBackgroundColor: 'red',
    },
];

const dataPoint = (month: Date) => (day: number, count: number) => {
    const monthPrefix = format(month, 'yyyy-MM');

    return {
        period: `${monthPrefix}-${day.toString().padStart(2, '0')}`,
        trafficTypes: [{ count, group: 'successful-requests' }],
    };
};

const trafficData4Days = (
    month: Date,
): TrafficUsageDataSegmentedCombinedSchemaApiDataItem[] => {
    const point = dataPoint(month);
    const dataPoints = [
        point(1, 23_000_000),
        point(2, 22_000_000),
        point(3, 24_000_000),
        point(4, 21_000_000),
    ];
    return [
        { apiPath: '/api/frontend', dataPoints },
        { apiPath: '/api/admin', dataPoints },
        { apiPath: '/api/client', dataPoints },
    ];
};

describe('traffic overage calculation', () => {
    it('should return 0 if there is no overage this month', () => {
        const dataUsage = 52_900_000;
        const includedTraffic = 53_000_000;
        const result = calculateOverageCost(dataUsage, includedTraffic);
        expect(result).toBe(0);
    });

    it('should return 0 if overage this month is atleast 1 request above included', () => {
        const dataUsage = 53_000_001;
        const includedTraffic = 53_000_000;
        const result = calculateOverageCost(dataUsage, includedTraffic);
        expect(result).toBe(0);
    });

    it('should return 5 if overage this month is atleast 1M request above included', () => {
        const dataUsage = 54_000_000;
        const includedTraffic = 53_000_000;
        const result = calculateOverageCost(dataUsage, includedTraffic);
        expect(result).toBe(5);
    });

    it('should return 10 if overage this month is > 2M request above included', () => {
        const dataUsage = 55_100_000;
        const includedTraffic = 53_000_000;
        const result = calculateOverageCost(dataUsage, includedTraffic);
        expect(result).toBe(10);
    });

    it('doesnt estimate when having less than 5 days worth of data', () => {
        const now = new Date();
        const period = toSelectablePeriod(now);
        const testNow = new Date(now.getFullYear(), now.getMonth(), 4);
        const includedTraffic = 53_000_000;
        const rawData = trafficData4Days(now);
        const result = calculateEstimatedMonthlyCost(
            rawData,
            includedTraffic,
            testNow,
        );
        expect(result).toBe(0);
    });

    it('needs 5 days or more to estimate for the month', () => {
        const testData = testData4Days;
        testData[0].data.push(23_000_000);
        testData[1].data.push(23_000_000);
        testData[2].data.push(23_000_000);
        const now = new Date();
        const testNow = new Date(now.getFullYear(), now.getMonth(), 5);
        const includedTraffic = 53_000_000;
        const rawData = trafficData4Days(now);
        rawData[0].dataPoints.push(dataPoint(now)(5, 23_000_000));
        rawData[1].dataPoints.push(dataPoint(now)(5, 23_000_000));
        rawData[2].dataPoints.push(dataPoint(now)(5, 23_000_000));
        const result = calculateEstimatedMonthlyCost(
            rawData,
            includedTraffic,
            testNow,
        );
        expect(result).toBeGreaterThan(1430);
    });

    it('estimates projected data usage', () => {
        const testData = testData4Days;
        testData[0].data.push(22_500_000);
        testData[1].data.push(22_500_000);
        testData[2].data.push(22_500_000);
        // Testing April 5th of 2024 (30 days)
        const now = new Date(2024, 3, 5);
        const period = toSelectablePeriod(now);
        const rawData = trafficData4Days(now);
        rawData[0].dataPoints.push(dataPoint(now)(5, 22_500_000));
        rawData[1].dataPoints.push(dataPoint(now)(5, 22_500_000));
        rawData[2].dataPoints.push(dataPoint(now)(5, 22_500_000));
        const result = calculateProjectedUsage({
            dayOfMonth: now.getDate(),
            daysInMonth: period.dayCount,
            trafficData: rawData,
        });
        // 22_500_000 * 3 * 30 = 2_025_000_000
        expect(result).toBe(2_025_000_000);
    });

    it('supports custom price and unit size', () => {
        const dataUsage = 54_000_000;
        const includedTraffic = 53_000_000;
        const result = calculateOverageCost(
            dataUsage,
            includedTraffic,
            10,
            500_000,
        );
        expect(result).toBe(20);
    });

    it('estimates based on custom price and unit size', () => {
        const testData = testData4Days;
        testData[0].data.push(22_500_000);
        testData[1].data.push(22_500_000);
        testData[2].data.push(22_500_000);
        const now = new Date();
        const period = toSelectablePeriod(now);
        const testNow = new Date(now.getFullYear(), now.getMonth(), 5);
        const includedTraffic = 53_000_000;
        const trafficUnitSize = 500_000;
        const trafficUnitCost = 10;

        const rawData = trafficData4Days(now);
        rawData[0].dataPoints.push(dataPoint(now)(5, 22_500_000));
        rawData[1].dataPoints.push(dataPoint(now)(5, 22_500_000));
        rawData[2].dataPoints.push(dataPoint(now)(5, 22_500_000));
        const result = calculateEstimatedMonthlyCost(
            rawData,
            includedTraffic,
            testNow,
            trafficUnitCost,
            trafficUnitSize,
        );

        const totalExpectedUsage = 22_500_000 * 3 * getDaysInMonth(now);
        const overage = totalExpectedUsage - includedTraffic;
        const overageUnits = Math.floor(overage / trafficUnitSize);
        const total = overageUnits * trafficUnitCost;
        expect(result).toBe(total);
    });
});

describe('filtering out unwanted data', () => {
    it('removes the /edge endpoint data', () => {
        const input: TrafficUsageDataSegmentedCombinedSchema = {
            grouping: 'daily',
            dateRange: { from: '2025-02-01', to: '2025-02-28' },
            apiData: [
                { apiPath: '/api/client', dataPoints: [] },
                { apiPath: '/edge', dataPoints: [] },
                { apiPath: '/api/admin', dataPoints: [] },
                { apiPath: '/api/frontend', dataPoints: [] },
            ],
        };

        const expected = {
            grouping: 'daily',
            dateRange: { from: '2025-02-01', to: '2025-02-28' },
            apiData: [
                { apiPath: '/api/client', dataPoints: [] },
                { apiPath: '/api/admin', dataPoints: [] },
                { apiPath: '/api/frontend', dataPoints: [] },
            ],
        };

        expect(cleanTrafficData(input)).toStrictEqual(expected);
    });

    it('removes any data from before the traffic measuring was put in place', () => {
        const input: TrafficUsageDataSegmentedCombinedSchema = {
            grouping: 'monthly',
            dateRange: {
                from: '2024-02-01',
                to: '2025-06-31',
            },
            apiData: [
                {
                    apiPath: '/api/client',
                    dataPoints: [
                        { period: '2024-06', trafficTypes: [] },
                        { period: '2024-05', trafficTypes: [] },
                        { period: '2024-04', trafficTypes: [] },
                        { period: '2024-03', trafficTypes: [] },
                        { period: '2024-02', trafficTypes: [] },
                    ],
                },
            ],
        };

        const expected = {
            grouping: 'monthly',
            dateRange: {
                from: '2024-02-01',
                to: '2025-06-31',
            },
            apiData: [
                {
                    apiPath: '/api/client',
                    dataPoints: [
                        { period: '2024-06', trafficTypes: [] },
                        { period: '2024-05', trafficTypes: [] },
                    ],
                },
            ],
        };

        expect(cleanTrafficData(input)).toStrictEqual(expected);
    });
});

describe('calculateTotalUsage', () => {
    const dataPoint = (period: string, count: number) => ({
        period,
        trafficTypes: [{ count, group: 'successful-requests' }],
    });
    it('calculates total from daily data', () => {
        const input: TrafficUsageDataSegmentedCombinedSchema = {
            grouping: 'daily',
            dateRange: { from: '2025-02-01', to: '2025-02-28' },
            apiData: [
                {
                    apiPath: '/api/client',
                    dataPoints: [
                        dataPoint('2024-02-01', 1),
                        dataPoint('2024-02-15', 2),
                        dataPoint('2024-02-07', 3),
                    ],
                },
                {
                    apiPath: '/api/admin',
                    dataPoints: [
                        dataPoint('2024-02-01', 4),
                        dataPoint('2024-02-15', 5),
                        dataPoint('2024-02-07', 6),
                    ],
                },
                {
                    apiPath: '/api/frontend',
                    dataPoints: [
                        dataPoint('2024-02-01', 7),
                        dataPoint('2024-02-15', 8),
                        dataPoint('2024-02-07', 9),
                    ],
                },
            ],
        };

        expect(calculateTotalUsage(input)).toBe(45);
    });

    it('calculates total for the most recent month in monthly data', () => {
        const input: TrafficUsageDataSegmentedCombinedSchema = {
            grouping: 'monthly',
            dateRange: { from: '2024-10-01', to: '2025-01-31' },
            apiData: [
                {
                    apiPath: '/api/client',
                    dataPoints: [
                        dataPoint('2025-01', 1),
                        dataPoint('2024-12', 2),
                        dataPoint('2024-10', 3),
                    ],
                },
                {
                    apiPath: '/api/admin',
                    dataPoints: [
                        dataPoint('2025-01', 4),
                        dataPoint('2024-11', 5),
                        dataPoint('2024-10', 6),
                    ],
                },
                {
                    apiPath: '/api/frontend',
                    dataPoints: [
                        dataPoint('2024-11', 7),
                        dataPoint('2024-12', 8),
                        dataPoint('2024-10', 9),
                    ],
                },
            ],
        };

        expect(calculateTotalUsage(input)).toBe(5);
    });
});