import { describe, it } from "node:test";
import assert from "node:assert/strict";
import { parseLinkedInCSV } from "../src/parsers/csv-parser.js";
import { join, dirname } from "node:path";
import { fileURLToPath } from "node:url";

const __dirname = dirname(fileURLToPath(import.meta.url));
const fixturesDir = join(__dirname, "fixtures");

describe("CSV Parser", () => {
  it("should parse standard CSV export", () => {
    const filePath = join(fixturesDir, "sample-export.csv");
    const batch = parseLinkedInCSV(filePath, "sample-export.csv");

    assert.equal(batch.postCount, 8, "Should have 8 posts");
    assert.equal(batch.posts.length, 8, "Posts array should have 8 items");
    assert.equal(batch.exportFilename, "sample-export.csv");
    assert.ok(batch.batchId, "Should have a batchId");
    assert.ok(batch.importedAt, "Should have importedAt timestamp");

    // Check first post
    const firstPost = batch.posts[0];
    assert.ok(firstPost.id, "Post should have an ID");
    assert.ok(
      firstPost.title.includes("uncomfortable truth"),
      "Title should match"
    );
    assert.equal(firstPost.publishedDate, "2026-01-28");
    assert.equal(firstPost.metrics.impressions, 4523);
    assert.equal(firstPost.metrics.reactions, 87);
    assert.equal(firstPost.metrics.comments, 23);
    assert.equal(firstPost.metrics.shares, 12);
    assert.equal(firstPost.metrics.clicks, 156);
    assert.ok(firstPost.metrics.engagementRate > 0, "Should have engagement rate");
  });

  it("should handle European format", () => {
    const filePath = join(fixturesDir, "european-export.csv");
    const batch = parseLinkedInCSV(filePath, "european-export.csv");

    assert.equal(batch.postCount, 2, "Should have 2 posts");

    // Check that European number format is parsed correctly
    const firstPost = batch.posts[0];
    assert.equal(firstPost.metrics.impressions, 4523, "Should parse 4.523 as 4523");
    assert.equal(firstPost.publishedDate, "2026-01-28", "Should normalize date from DD.MM.YYYY");

    const secondPost = batch.posts[1];
    assert.equal(secondPost.metrics.impressions, 2891, "Should parse 2.891 as 2891");
    assert.equal(secondPost.publishedDate, "2026-01-26", "Should normalize date from DD.MM.YYYY");
  });

  it("should handle empty CSV", () => {
    const filePath = join(fixturesDir, "empty-export.csv");
    const batch = parseLinkedInCSV(filePath, "empty-export.csv");

    assert.equal(batch.postCount, 0, "Should have 0 posts");
    assert.equal(batch.posts.length, 0, "Posts array should be empty");
    assert.equal(batch.dateRange.from, "", "Date range from should be empty");
    assert.equal(batch.dateRange.to, "", "Date range to should be empty");
  });

  it("should handle BOM", () => {
    const filePath = join(fixturesDir, "bom-export.csv");
    const batch = parseLinkedInCSV(filePath, "bom-export.csv");

    assert.equal(batch.postCount, 8, "Should parse BOM file correctly");
    assert.ok(
      batch.posts[0].title.includes("uncomfortable truth"),
      "Should parse first post correctly despite BOM"
    );
  });

  it("should calculate engagement rate", () => {
    const filePath = join(fixturesDir, "sample-export.csv");
    const batch = parseLinkedInCSV(filePath, "sample-export.csv");

    const firstPost = batch.posts[0];
    // (87+23+12+156)/4523 * 100 = 6.14...
    const expectedRate = ((87 + 23 + 12 + 156) / 4523) * 100;
    assert.ok(
      Math.abs(firstPost.metrics.engagementRate - expectedRate) < 0.01,
      `Engagement rate should be ~${expectedRate}, got ${firstPost.metrics.engagementRate}`
    );
  });

  it("should generate deterministic post IDs", () => {
    const filePath = join(fixturesDir, "sample-export.csv");
    const batch1 = parseLinkedInCSV(filePath, "sample-export.csv");
    const batch2 = parseLinkedInCSV(filePath, "sample-export.csv");

    // Same post should have same ID
    assert.equal(
      batch1.posts[0].id,
      batch2.posts[0].id,
      "Same post should generate same ID"
    );

    // Different posts should have different IDs
    assert.notEqual(
      batch1.posts[0].id,
      batch1.posts[1].id,
      "Different posts should have different IDs"
    );
  });

  it("should normalize dates to YYYY-MM-DD", () => {
    const filePath = join(fixturesDir, "sample-export.csv");
    const batch = parseLinkedInCSV(filePath, "sample-export.csv");

    // All dates should be in YYYY-MM-DD format
    batch.posts.forEach((post) => {
      assert.match(
        post.publishedDate,
        /^\d{4}-\d{2}-\d{2}$/,
        `Date ${post.publishedDate} should be in YYYY-MM-DD format`
      );
    });

    // Check date range
    assert.equal(batch.dateRange.from, "2026-01-13", "Date range from should be earliest date");
    assert.equal(batch.dateRange.to, "2026-01-28", "Date range to should be latest date");
  });
});
