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/*
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 * core/lib/text.test.ts
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 *
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 * Copyright (C) 2025 Posit Software, PBC
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 */
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import { unitTest } from "../../../test.ts";
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import { assertEquals } from "testing/asserts";
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import { getEndingNewlineCount, lines } from "../../../../src/core/lib/text.ts";
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unitTest("core/lib/text.ts - getEndingNewlineCount", async () => {
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  // Test case 1: No trailing newlines
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  assertEquals(getEndingNewlineCount(["content without newlines"]), 0);
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  assertEquals(getEndingNewlineCount(["line1", "line2", "line3"]), 0);
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  // Test case 2: Single line with trailing newlines
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  assertEquals(getEndingNewlineCount(["content\n"]), 1);
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  assertEquals(getEndingNewlineCount(["content\n\n\n"]), 3);
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  // Test case 3: Multiple lines with the last line having trailing newlines
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  assertEquals(getEndingNewlineCount(["line1", "line2", "line3\n\n"]), 2);
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  assertEquals(getEndingNewlineCount(["line1\n", "line2\n", "line3\n\n\n"]), 3);
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  // Test case 4: Empty lines at the end
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  assertEquals(getEndingNewlineCount(["content", "", ""]), 0);
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  // Test case 5: Lines with only newlines at the end
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  assertEquals(getEndingNewlineCount(["content", "\n", "\n\n"]), 3);
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  assertEquals(getEndingNewlineCount(["content", "\n\n\n"]), 3);
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  // Test case 6: Mixed scenario with empty lines and lines with only newlines
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  assertEquals(getEndingNewlineCount(["content\n", "", "\n\n", ""]), 3);
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  assertEquals(getEndingNewlineCount(["content", "", "\n", "\n\n", ""]), 3);
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  // Test case 7: Edge case with only empty strings
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  assertEquals(getEndingNewlineCount(["", "", ""]), 0);
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  // Test case 8: Edge case with an empty array
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  assertEquals(getEndingNewlineCount([]), 0);
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  // Test case 9: Content after newlines breaks the counting
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  assertEquals(getEndingNewlineCount(["line1\n\n", "line2"]), 0);
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  assertEquals(getEndingNewlineCount(["line1", "line2\n\n", "line3"]), 0);
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  // Test case 10: Complex scenario with mixed content
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  assertEquals(
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    getEndingNewlineCount([
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      "some content",
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      "more content\n",
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      "\n",
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      "",
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      "final line\n\n",
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    ]),
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    2,
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  );
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  assertEquals(
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    getEndingNewlineCount([
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      "line1",
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      "line2",
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      "line3\nwith content",
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      "\n",
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      "\n\n",
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    ]),
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    3,
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  );
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});
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// Test for lines() function with different line endings
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// See: https://github.com/quarto-dev/quarto-cli/issues/13998
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unitTest("core/lib/text.ts - lines() with different line endings", async () => {
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  // LF (Unix/Linux)
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  assertEquals(lines("a\nb\nc"), ["a", "b", "c"]);
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  // CRLF (Windows)
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  assertEquals(lines("a\r\nb\r\nc"), ["a", "b", "c"]);
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  // CR-only (old Mac) - the fix for #13998
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  assertEquals(lines("a\rb\rc"), ["a", "b", "c"]);
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  // Mixed endings
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  assertEquals(lines("a\rb\nc\r\nd"), ["a", "b", "c", "d"]);
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  // YAML front matter with CR-only
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  const yaml = "---\rtitle: \"Test\"\r---";
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  assertEquals(lines(yaml), ["---", "title: \"Test\"", "---"]);
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  // Empty string
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  assertEquals(lines(""), [""]);
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  // Single line without newline
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  assertEquals(lines("single"), ["single"]);
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  // Trailing newlines
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  assertEquals(lines("a\n"), ["a", ""]);
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  assertEquals(lines("a\r"), ["a", ""]);
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  assertEquals(lines("a\r\n"), ["a", ""]);
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});
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