import { describe, expect, it } from "@suaveplan/testing/runner";
import { parseCron } from "../src/index.js";

interface Vector {
    expr: string;
    after: number;
    tz: string;
    expected: number;
    label: string;
}

const utc = (y: number, mo: number, d: number, h = 0, mi = 0, s = 0): number =>
    Date.UTC(y, mo, d, h, mi, s);

const vectors: Vector[] = [
    // Hourly variants
    {
        expr: "0 * * * *",
        after: utc(2026, 4, 11, 10, 30),
        tz: "UTC",
        expected: utc(2026, 4, 11, 11, 0),
        label: "hourly @00",
    },
    {
        expr: "*/15 * * * *",
        after: utc(2026, 4, 11, 10, 7),
        tz: "UTC",
        expected: utc(2026, 4, 11, 10, 15),
        label: "every 15 minutes",
    },
    {
        expr: "*/15 * * * *",
        after: utc(2026, 4, 11, 10, 45),
        tz: "UTC",
        expected: utc(2026, 4, 11, 11, 0),
        label: "every 15 wrap",
    },
    {
        expr: "*/30 * * * *",
        after: utc(2026, 4, 11, 10, 29),
        tz: "UTC",
        expected: utc(2026, 4, 11, 10, 30),
        label: "every 30 minutes",
    },

    // Daily
    {
        expr: "0 9 * * *",
        after: utc(2026, 4, 11, 8, 0),
        tz: "UTC",
        expected: utc(2026, 4, 11, 9, 0),
        label: "daily 9am",
    },
    {
        expr: "0 0 * * *",
        after: utc(2026, 4, 11, 12, 0),
        tz: "UTC",
        expected: utc(2026, 4, 12, 0, 0),
        label: "daily midnight",
    },
    {
        expr: "@daily",
        after: utc(2026, 4, 11, 12, 0),
        tz: "UTC",
        expected: utc(2026, 4, 12, 0, 0),
        label: "@daily macro",
    },
    {
        expr: "@hourly",
        after: utc(2026, 4, 11, 10, 30),
        tz: "UTC",
        expected: utc(2026, 4, 11, 11, 0),
        label: "@hourly macro",
    },

    // Weekdays / weekends
    // 2026-05-09 is Saturday. Next 9am weekday = Mon 2026-05-11.
    {
        expr: "0 9 * * MON-FRI",
        after: utc(2026, 4, 9),
        tz: "UTC",
        expected: utc(2026, 4, 11, 9, 0),
        label: "9am weekdays",
    },
    {
        expr: "0 12 * * 0",
        after: utc(2026, 4, 11),
        tz: "UTC",
        expected: utc(2026, 4, 17, 12, 0),
        label: "noon Sundays",
    },
    {
        expr: "0 9 * * 7",
        after: utc(2026, 4, 11),
        tz: "UTC",
        expected: utc(2026, 4, 17, 9, 0),
        label: "9am Sundays via 7",
    },

    // Monthly / yearly
    {
        expr: "0 0 1 * *",
        after: utc(2026, 4, 11),
        tz: "UTC",
        expected: utc(2026, 5, 1, 0, 0),
        label: "first of month",
    },
    {
        expr: "@monthly",
        after: utc(2026, 4, 11),
        tz: "UTC",
        expected: utc(2026, 5, 1, 0, 0),
        label: "@monthly macro",
    },
    {
        expr: "0 0 1 1 *",
        after: utc(2026, 0, 2),
        tz: "UTC",
        expected: utc(2027, 0, 1, 0, 0),
        label: "annual Jan 1",
    },
    {
        expr: "@yearly",
        after: utc(2026, 0, 2),
        tz: "UTC",
        expected: utc(2027, 0, 1, 0, 0),
        label: "@yearly macro",
    },

    // Month aliases
    {
        expr: "0 0 1 JUL *",
        after: utc(2026, 4, 11),
        tz: "UTC",
        expected: utc(2026, 6, 1, 0, 0),
        label: "month alias JUL",
    },

    // 4 specific minutes
    {
        expr: "0,15,30,45 9-17 * * MON-FRI",
        after: utc(2026, 4, 11, 9, 16),
        tz: "UTC",
        expected: utc(2026, 4, 11, 9, 30),
        label: "quarter-hour business hours",
    },
    {
        expr: "0,15,30,45 9-17 * * MON-FRI",
        after: utc(2026, 4, 11, 17, 46),
        tz: "UTC",
        expected: utc(2026, 4, 12, 9, 0),
        label: "wrap to next business day",
    },

    // Range/step variations
    {
        expr: "0 10-12/2 * * *",
        after: utc(2026, 4, 11, 9, 0),
        tz: "UTC",
        expected: utc(2026, 4, 11, 10, 0),
        label: "step in range first",
    },
    {
        expr: "0 10-12/2 * * *",
        after: utc(2026, 4, 11, 11, 0),
        tz: "UTC",
        expected: utc(2026, 4, 11, 12, 0),
        label: "step in range second",
    },

    // Leap year
    {
        expr: "0 0 29 2 *",
        after: utc(2026, 0, 1),
        tz: "UTC",
        expected: utc(2028, 1, 29, 0, 0),
        label: "leap day next",
    },

    // DST — America/New_York 2026-03-08 spring-forward
    {
        expr: "0 3 * * *",
        after: utc(2026, 2, 8, 6, 0),
        tz: "America/New_York",
        // 03:00 EDT on 2026-03-08 = 07:00 UTC
        expected: utc(2026, 2, 8, 7, 0),
        label: "NY 3am day-of-spring-forward",
    },

    // Europe/London non-DST anchor
    // 2026-01-01 09:00 London = 09:00 UTC (GMT in January)
    {
        expr: "0 9 * * *",
        after: utc(2025, 11, 31, 23, 0),
        tz: "Europe/London",
        expected: utc(2026, 0, 1, 9, 0),
        label: "London winter 9am",
    },

    // Australia/Sydney winter 12:00 local = 02:00 UTC (UTC+10).
    // after = 2026-05-31T00:00Z = 2026-05-31T10:00 Sydney, next noon
    // Sydney = 2026-05-31T12:00 local = 2026-05-31T02:00 UTC.
    {
        expr: "0 12 * * *",
        after: utc(2026, 4, 31, 0, 0),
        tz: "Australia/Sydney",
        expected: utc(2026, 4, 31, 2, 0),
        label: "Sydney winter noon",
    },

    // Seconds + Quartz variants (need seconds: true)
    // Tested separately because parseCron options differ.
];

describe("vectors — 5-field UTC + DST", () => {
    for (const v of vectors) {
        it(v.label, { timeout: 5000 }, () => {
            const expr = parseCron(v.expr);
            const next = expr.nextRun(v.after, v.tz);
            expect(next).toBe(v.expected);
        });
    }
});

describe("vectors — 6-field seconds", () => {
    it("every 10 seconds", { timeout: 5000 }, () => {
        const expr = parseCron("*/10 * * * * *", { seconds: true });
        expect(expr.nextRun(utc(2026, 4, 11, 10, 0, 5), "UTC")).toBe(
            utc(2026, 4, 11, 10, 0, 10)
        );
    });

    it("seconds with hour wrap", { timeout: 5000 }, () => {
        const expr = parseCron("30 0 * * * *", { seconds: true });
        expect(expr.nextRun(utc(2026, 4, 11, 10, 0, 30), "UTC")).toBe(
            utc(2026, 4, 11, 11, 0, 30)
        );
    });
});

describe("vectors — 7-field Quartz year", () => {
    it("year-constrained next run", { timeout: 5000 }, () => {
        const expr = parseCron("0 0 12 1 1 * 2030", {
            seconds: true,
            years: true,
        });
        expect(expr.nextRun(utc(2026, 0, 1), "UTC")).toBe(
            utc(2030, 0, 1, 12, 0, 0)
        );
    });
});