import { assertEquals } from "jsr:@std/assert";
import { resolveEventStart } from "./icalendar.ts";

Deno.test("resolveEventStart - local date with timezone", async () => {
  const icsEvent = {
    summary: "Test Event",
    start: {
      date: "2025-01-15T12:00:00.000",
      local: {
        date: "2025-01-15T07:00:00.000",
        timezone: "Eastern Standard Time"
      }
    }
  };
  
  const result = await resolveEventStart(icsEvent);
  assertEquals(result?.toISOString(), "2025-01-15T12:00:00.000Z");
});

Deno.test("resolveEventStart - DST check (Summer)", async () => {
  const icsEvent = {
    summary: "Test Event DST",
    start: {
      date: "2025-07-15T11:00:00.000",
      local: {
        date: "2025-07-15T07:00:00.000",
        timezone: "Eastern Standard Time"
      }
    }
  };
  
  const result = await resolveEventStart(icsEvent);
  assertEquals(result?.toISOString(), "2025-07-15T11:00:00.000Z");
});

Deno.test("resolveEventStart - UTC event", async () => {
  const icsEvent = {
    summary: "UTC Event",
    start: {
      date: "2025-01-15T12:00:00.000Z"
    }
  };
  const result = await resolveEventStart(icsEvent);
  assertEquals(result?.toISOString(), "2025-01-15T12:00:00.000Z");
});