import { assertEquals, assert } from "jsr:@std/assert";
import { convertIcsCalendar } from "https://esm.sh/ts-ics@2.4.0";
import { expandRecurrences, resolveEventStart, localDateString } from "../icalendar.ts";

Deno.test("Integration - parse and expand real-world ICS samples", async () => {
  const testDataDir = "./test_data";
  let files: string[] = [];
  try {
    for await (const dirEntry of Deno.readDir(testDataDir)) {
      if (dirEntry.isFile && dirEntry.name.endsWith(".ics")) {
        files.push(`${testDataDir}/${dirEntry.name}`);
      }
    }
  } catch {
    console.warn("⚠️ No test_data directory found or accessible. Skipping real-data integration test.");
    // We might be running from root
  }

  if (files.length === 0) {
    // Try current dir if test_data is empty (fallback for CI or root execution)
    try {
        for await (const dirEntry of Deno.readDir(".")) {
            if (dirEntry.isFile && dirEntry.name.endsWith(".ics") && dirEntry.name !== "PLUG.md") {
                files.push(dirEntry.name);
            }
        }
    } catch {
        // ignore
    }
  }

  if (files.length === 0) {
    console.warn("⚠️ No .ics files found for integration test.");
    return;
  }

  console.log(`Found ${files.length} files to test.`);

  for (const file of files) {
    console.log(`  Testing file: ${file}`);
    const text = await Deno.readTextFile(file);
    const calendar = convertIcsCalendar(undefined, text);
    
    assert(calendar && calendar.events, `Failed to parse ${file}`);
    
    for (const icsEvent of calendar.events) {
      if (icsEvent.status?.toUpperCase() === "CANCELLED") continue;

      const finalDate = await resolveEventStart(icsEvent);
      if (!finalDate) continue;
      
      const localIso = localDateString(finalDate);
      const baseEvent = {
        ...icsEvent,
        name: icsEvent.summary || "Untitled Event",
        start: localIso,
        tag: "ical-event",
        sourceName: "IntegrationTest"
      };

      try {
        const expanded = expandRecurrences(baseEvent, 30);
        assert(expanded.length >= 1, `Expected at least 1 occurrence for event "${icsEvent.summary}" in ${file}`);
      } catch (err) {
        console.error(`❌ Error expanding recurrence for event "${icsEvent.summary}" in ${file}:`, err);
        throw err;
      }
    }
  }
});