import { describe, expect, it } from "vitest";
import { parseEmailSearchDate, validateDateRange } from "../dateParser";

function localParts(date: Date): [number, number, number] {
  return [date.getFullYear(), date.getMonth() + 1, date.getDate()];
}

const NOW = new Date(2026, 7, 5, 18, 44, 0);

describe("parseEmailSearchDate", () => {
  it("parses YYYY-MM-DD as local midnight", () => {
    const date = parseEmailSearchDate("2026-08-01", "since", NOW);
    expect(localParts(date)).toEqual([2026, 8, 1]);
    expect(date.getHours()).toBe(0);
  });

  it("parses today, yesterday, and tomorrow", () => {
    expect(localParts(parseEmailSearchDate("today", "since", NOW))).toEqual([2026, 8, 5]);
    expect(localParts(parseEmailSearchDate("yesterday", "since", NOW))).toEqual([2026, 8, 4]);
    expect(localParts(parseEmailSearchDate("tomorrow", "before", NOW))).toEqual([2026, 8, 6]);
  });

  it("parses numeric relative dates", () => {
    expect(localParts(parseEmailSearchDate("2 weeks ago", "since", NOW))).toEqual([
      2026,
      7,
      22,
    ]);
    expect(localParts(parseEmailSearchDate("last 3 months", "since", NOW))).toEqual([
      2026,
      5,
      5,
    ]);
  });

  it("parses article and word-number forms", () => {
    expect(localParts(parseEmailSearchDate("a month ago", "since", NOW))).toEqual([
      2026,
      7,
      5,
    ]);
    expect(localParts(parseEmailSearchDate("one year ago", "since", NOW))).toEqual([
      2025,
      8,
      5,
    ]);
  });

  it("clamps end-of-month calendar shifts", () => {
    const march31 = new Date(2026, 2, 31, 12, 0, 0);
    expect(localParts(parseEmailSearchDate("a month ago", "since", march31))).toEqual([
      2026,
      2,
      28,
    ]);
  });

  it("rejects impossible and unsupported dates", () => {
    expect(() => parseEmailSearchDate("2026-02-31", "since", NOW)).toThrow("Invalid since date");
    expect(() => parseEmailSearchDate("recently", "since", NOW)).toThrow("Unsupported since date");
  });
});

describe("validateDateRange", () => {
  it("accepts an increasing range", () => {
    expect(() =>
      validateDateRange(
        parseEmailSearchDate("2026-08-01", "since", NOW),
        parseEmailSearchDate("2026-08-02", "before", NOW),
      ),
    ).not.toThrow();
  });

  it("rejects equal or reversed ranges", () => {
    const date = parseEmailSearchDate("2026-08-01", "since", NOW);
    expect(() => validateDateRange(date, new Date(date))).toThrow("Invalid date range");
    expect(() =>
      validateDateRange(
        parseEmailSearchDate("2026-08-03", "since", NOW),
        parseEmailSearchDate("2026-08-02", "before", NOW),
      ),
    ).toThrow("Invalid date range");
  });
});

import { describe, expect, it } from "vitest";
import { parseEmailSearchDate, validateDateRange } from "../dateParser";

function localParts(date: Date): [number, number, number] {
  return [date.getFullYear(), date.getMonth() + 1, date.getDate()];
}

const NOW = new Date(2026, 7, 5, 18, 44, 0);

describe("parseEmailSearchDate", () => {
  it("parses YYYY-MM-DD as local midnight", () => {
    const date = parseEmailSearchDate("2026-08-01", "since", NOW);
    expect(localParts(date)).toEqual([2026, 8, 1]);
    expect(date.getHours()).toBe(0);
  });

  it("parses today, yesterday, and tomorrow", () => {
    expect(localParts(parseEmailSearchDate("today", "since", NOW))).toEqual([2026, 8, 5]);
    expect(localParts(parseEmailSearchDate("yesterday", "since", NOW))).toEqual([2026, 8, 4]);
    expect(localParts(parseEmailSearchDate("tomorrow", "before", NOW))).toEqual([2026, 8, 6]);
  });

  it("parses numeric relative dates", () => {
    expect(localParts(parseEmailSearchDate("2 weeks ago", "since", NOW))).toEqual([
      2026,
      7,
      22,
    ]);
    expect(localParts(parseEmailSearchDate("last 3 months", "since", NOW))).toEqual([
      2026,
      5,
      5,
    ]);
  });

  it("parses article and word-number forms", () => {
    expect(localParts(parseEmailSearchDate("a month ago", "since", NOW))).toEqual([
      2026,
      7,
      5,
    ]);
    expect(localParts(parseEmailSearchDate("one year ago", "since", NOW))).toEqual([
      2025,
      8,
      5,
    ]);
  });

  it("clamps end-of-month calendar shifts", () => {
    const march31 = new Date(2026, 2, 31, 12, 0, 0);
    expect(localParts(parseEmailSearchDate("a month ago", "since", march31))).toEqual([
      2026,
      2,
      28,
    ]);
  });

  it("rejects impossible and unsupported dates", () => {
    expect(() => parseEmailSearchDate("2026-02-31", "since", NOW)).toThrow("Invalid since date");
    expect(() => parseEmailSearchDate("recently", "since", NOW)).toThrow("Unsupported since date");
  });
});

describe("validateDateRange", () => {
  it("accepts an increasing range", () => {
    expect(() =>
      validateDateRange(
        parseEmailSearchDate("2026-08-01", "since", NOW),
        parseEmailSearchDate("2026-08-02", "before", NOW),
      ),
    ).not.toThrow();
  });

  it("rejects equal or reversed ranges", () => {
    const date = parseEmailSearchDate("2026-08-01", "since", NOW);
    expect(() => validateDateRange(date, new Date(date))).toThrow("Invalid date range");
    expect(() =>
      validateDateRange(
        parseEmailSearchDate("2026-08-03", "since", NOW),
        parseEmailSearchDate("2026-08-02", "before", NOW),
      ),
    ).toThrow("Invalid date range");
  });
});