aipack 0.8.26

use super::*;
type Result<T = ()> = core::result::Result<T, Box<dyn std::error::Error>>; // For tests.

// Helper to construct `changes` string for tests, ensuring markers are on their own lines.
fn format_change_block(search: &str, replace: &str) -> String {
	format!("{LINE_MARKER_SEARCH_START}\n{search}\n{LINE_MARKER_SEP}\n{replace}\n{LINE_MARKER_REPLACE_END}")
}

fn format_multiple_change_blocks(blocks: Vec<(&str, &str)>, separator_str: &str) -> String {
	blocks
		.into_iter()
		.map(|(s, r)| format_change_block(s, r))
		.collect::<Vec<String>>()
		.join(separator_str)
}

#[test]
fn test_support_text_apply_change_simple_replace_no_markers() -> Result {
	// -- Setup & Fixtures
	let original = "Hello world";
	let changes = "Hallo Welt".to_string();

	// -- Exec
	let result = apply_changes(original, changes)?.0;

	// -- Check
	assert_eq!(result, "Hallo Welt");
	Ok(())
}

#[test]
fn test_support_text_apply_change_simple_replace_contains_end_marker_only_as_text() -> Result {
	// -- Setup & Fixtures
	let original = "Hello world";
	// LINE_MARKER_REPLACE_END is not at the start of a line, so simple mode.
	let changes = format!("Some text {LINE_MARKER_REPLACE_END} with an end marker style part");

	// -- Exec
	let result = apply_changes(original, changes.clone())?.0;

	// -- Check
	assert_eq!(result, changes);
	Ok(())
}

#[test]
fn test_support_text_apply_change_single_valid_block_original_markers_format() -> Result {
	// -- Setup & Fixtures
	let original = "Hello old_text world, and old_text again.";
	// The old MARKER_... constants included newlines.
	// The format_change_block helper ensures clean lines now.
	let changes = format_change_block("old_text", "new_text");

	// -- Exec
	let result = apply_changes(original, changes)?.0;

	// -- Check
	// replacen replaces only the first "old_text".
	assert_eq!(result, "Hello new_text world, and old_text again.");
	Ok(())
}

#[test]
fn test_support_text_apply_change_single_valid_block_explicit_lines() -> Result {
	// -- Setup & Fixtures
	let original = "Hello old_text1 world.";
	let changes = format_change_block("old_text1", "new_text1");

	// -- Exec
	let result = apply_changes(original, changes)?.0;

	// -- Check
	assert_eq!(result, "Hello new_text1 world.");
	Ok(())
}

#[test]
fn test_support_text_apply_change_multiline_patterns_in_block_new_format() -> Result {
	// -- Setup & Fixtures
	let original = "First line\nSecond old line\nThird line";
	let search_pattern_text = "Second old line";
	let replace_pattern_text = "Second new line\nAnd a new third line";

	let changes = format_change_block(search_pattern_text, replace_pattern_text);

	// -- Exec
	let result = apply_changes(original, changes)?.0;

	// -- Check
	let expected = "First line\nSecond new line\nAnd a new third line\nThird line";
	assert_eq!(result, expected);
	Ok(())
}

#[test]
fn test_support_text_apply_change_multiple_valid_blocks() -> Result {
	// -- Setup & Fixtures
	let original = "one two three two one";
	let blocks_data = vec![("one", "1"), ("two", "2"), ("three", "3")];
	let changes = format_multiple_change_blocks(blocks_data, "\n");

	// -- Exec
	let result = apply_changes(original, changes)?.0;

	// -- Check
	// 1. "one two three two one".replacen("one", "1", 1) -> "1 two three two one"
	// 2. "1 two three two one".replacen("two", "2", 1) -> "1 2 three two one"
	// 3. "1 2 three two one".replacen("three", "3", 1) -> "1 2 3 two one"
	assert_eq!(result, "1 2 3 two one");
	Ok(())
}

#[test]
fn test_support_text_apply_change_multiple_blocks_with_newlines_between() -> Result {
	// -- Setup & Fixtures
	let original = "one two three two one";
	let blocks_data = vec![("one", "1"), ("two", "2"), ("three", "3")];
	let changes = format_multiple_change_blocks(blocks_data, "\n\n\n"); // Whitespace lines between blocks

	// -- Exec
	let result = apply_changes(original, changes)?.0;

	// -- Check
	assert_eq!(result, "1 2 3 two one"); // Same logic as above
	Ok(())
}

#[test]
fn test_support_text_apply_change_multiple_blocks_with_mixed_whitespace_and_trailing_clean_markers() -> Result {
	// -- Setup & Fixtures
	let original = "apple banana cherry";
	let block1 = format_change_block("apple", "A");
	let block2 = format_change_block("banana", "B");
	let block3 = format_change_block("cherry", "C");
	// TODO: Should allow spaced after the markers on same line
	let changes = format!("{block1}\n{block2}\n{block3}");

	// -- Exec
	let result = apply_changes(original, changes)?.0;

	// -- Check
	// 1. "apple banana cherry".replacen("apple", "A", 1) -> "A banana cherry"
	// 2. "A banana cherry".replacen("banana", "B", 1) -> "A B cherry"
	// 3. "A B cherry".replacen("cherry", "C", 1) -> "A B C"
	assert_eq!(result, "A B C");
	Ok(())
}

#[test]
fn test_support_text_apply_change_error_marker_line_with_trailing_whitespace() -> Result {
	// -- Setup & Fixtures
	let original = "apple";
	let changes = format!(
		"{}\napple\n{}\n{}\n{}",
		LINE_MARKER_SEARCH_START,
		LINE_MARKER_SEP,
		"A",
		LINE_MARKER_REPLACE_END // This is correct
	)
	// Now make one of the marker lines incorrect by adding trailing space
	.replace(LINE_MARKER_SEP, &format!("{LINE_MARKER_SEP} ")); // "======= "

	// -- Exec
	let result = apply_changes(original, changes);

	// -- Check
	assert!(result.is_err(), "Should fail due to malformed marker line");
	if let Err(e) = result {
		// The line "======= " is not a valid separator, so it's part of search pattern.
		// Parsing ends in InSearchPattern state.
		assert!(
			e.to_string().contains(&format!("Missing separator marker '{LINE_MARKER_SEP}'")),
			"Error message mismatch: {e}"
		);
	}
	Ok(())
}

#[test]
fn test_support_text_apply_change_error_with_preamble() -> Result {
	// -- Setup & Fixtures
	let original = "Replace target.";
	let changes = format!(
		"Some preamble text, should cause error.\n{LINE_MARKER_SEARCH_START}\ntarget\n{LINE_MARKER_SEP}\nreplacement\n{LINE_MARKER_REPLACE_END}"
	);

	// -- Exec
	let result = apply_changes(original, changes);

	// -- Check
	assert!(result.is_err(), "Should fail due to preamble text");
	if let Err(e) = result {
		assert!(
			e.to_string().contains("Expected '<<<<<<< SEARCH' or a whitespace line"),
			"Error message mismatch: {e}"
		);
		assert!(
			e.to_string().contains("Line: 'Some preamble text"),
			"Error message mismatch: {e}"
		);
	}
	Ok(())
}

#[test]
fn test_support_text_apply_change_error_with_interstitial_text() -> Result {
	// -- Setup & Fixtures
	let original = "one two";
	let block1 = format_change_block("one", "1");
	let block2 = format_change_block("two", "2");
	let changes = format!("{block1}\n  Some interstitial text, should cause error.\n{block2}");

	// -- Exec
	let result = apply_changes(original, changes);

	// -- Check
	assert!(result.is_err(), "Should fail due to interstitial text");
	if let Err(e) = result {
		assert!(
			e.to_string().contains("Expected '<<<<<<< SEARCH' or a whitespace line"),
			"Error message mismatch: {e}"
		);
		assert!(
			e.to_string().contains("Line: '  Some interstitial text"),
			"Error message mismatch: {e}"
		);
	}
	Ok(())
}

#[test]
fn test_support_text_apply_change_error_with_trailing_text() -> Result {
	// -- Setup & Fixtures
	let original = "Replace target.";
	let block = format_change_block("target", "replacement");
	let changes = format!("{block}\n  Some trailing text, should cause error.");

	// -- Exec
	let result = apply_changes(original, changes);

	// -- Check
	assert!(result.is_err(), "Should fail due to trailing text");
	if let Err(e) = result {
		assert!(
			e.to_string().contains("Expected '<<<<<<< SEARCH' or a whitespace line"),
			"Error message mismatch: {e}"
		);
		assert!(
			e.to_string().contains("Line: '  Some trailing text"),
			"Error message mismatch: {e}"
		);
	}
	Ok(())
}

#[test]
fn test_support_text_apply_change_search_not_found_in_original() -> Result {
	// -- Setup & Fixtures
	let original = "Hello world";
	let changes = format_change_block("not_found_text", "replacement");

	// -- Exec
	let (result, info) = apply_changes(original, changes)?;

	// -- Check
	assert_eq!(
		result, original,
		"Original should be unchanged as search pattern not found"
	);
	assert_eq!(info.changed_count, 0);
	assert_eq!(info.failed_changes.len(), 1);
	assert_eq!(info.failed_changes[0].search, "not_found_text");
	assert_eq!(info.failed_changes[0].reason, "Search block not found in content");

	Ok(())
}

#[test]
fn test_support_text_apply_change_mixed_success_and_failure() -> Result {
	// -- Setup & Fixtures
	let original = "one two three";
	let changes = format!(
		"{}\n{}",
		format_change_block("two", "2"),  // Should succeed
		format_change_block("four", "4")  // Should fail
	);

	// -- Exec
	let (result, info) = apply_changes(original, changes)?;

	// -- Check
	assert_eq!(result, "one 2 three");
	assert_eq!(info.changed_count, 1);
	assert_eq!(info.failed_changes.len(), 1);
	assert_eq!(info.failed_changes[0].search, "four");
	assert_eq!(info.failed_changes[0].reason, "Search block not found in content");

	Ok(())
}

#[test]
fn test_support_text_apply_change_empty_search_pattern() -> Result {
	// -- Setup & Fixtures
	let original = "abc";
	let changes = format_change_block("", "X"); // Empty search pattern

	// -- Exec
	let result = apply_changes(original, changes)?.0;

	// -- Check
	// "abc".replacen("", "X", 1) results in "Xabc"
	assert_eq!(result, "Xabc");
	Ok(())
}

#[test]
fn test_support_text_apply_change_empty_replace_pattern() -> Result {
	// -- Setup & Fixtures
	let original = "delete this text now";
	let changes = format_change_block("this text", ""); // Empty replace pattern

	// -- Exec
	let result = apply_changes(original, changes)?.0;

	// -- Check
	assert_eq!(result, "delete  now");
	Ok(())
}

#[test]
fn test_support_text_apply_change_empty_replace_pattern_removes_line_and_newline() -> Result {
	// -- Setup & Fixtures
	let original = "line one\nline two\nline three\n";
	let changes = format_change_block("line two", ""); // Empty replace pattern

	// -- Exec
	let result = apply_changes(original, changes)?.0;

	// -- Check
	assert_eq!(result, "line one\nline three\n");
	Ok(())
}

#[test]
fn test_support_text_apply_change_malformed_missing_separator() -> Result {
	// -- Setup & Fixtures
	let original = "Hello world";
	let changes = format!(
		"{LINE_MARKER_SEARCH_START}\nsearch_text_no_sep_then_end\n{LINE_MARKER_REPLACE_END}" // Missing LINE_MARKER_SEP
	);

	// -- Exec
	let result = apply_changes(original, changes);

	// -- Check
	assert!(result.is_err(), "Should fail due to missing separator");
	if let Err(e) = result {
		assert!(
			e.to_string().contains(&format!("Missing separator marker '{LINE_MARKER_SEP}'")),
			"Error message mismatch: {e}"
		);
	}
	Ok(())
}

#[test]
fn test_support_text_apply_change_malformed_missing_end() -> Result {
	// -- Setup & Fixtures
	let original = "Hello world";
	let changes = format!(
		"{LINE_MARKER_SEARCH_START}\nsearch_text\n{LINE_MARKER_SEP}\nreplace_text_no_end" // Missing LINE_MARKER_REPLACE_END
	);

	// -- Exec
	let result = apply_changes(original, changes);

	// -- Check
	assert!(result.is_err(), "Should fail due to missing end marker");
	if let Err(e) = result {
		assert!(
			e.to_string()
				.contains(&format!("Missing end marker '{LINE_MARKER_REPLACE_END}'")),
			"Error message mismatch: {e}"
		);
	}
	Ok(())
}

#[test]
fn test_support_text_apply_change_markers_as_text_in_patterns() -> Result {
	// -- Setup & Fixtures
	let original = format!(
		"Content with {LINE_MARKER_SEARCH_START} inside, and also {LINE_MARKER_SEP} and {LINE_MARKER_REPLACE_END}."
	);
	// Search for the literal text of a marker, not as a structural marker.
	let search_pattern = LINE_MARKER_SEARCH_START; // e.g. "<<<<<<< SEARCH"
	let replace_pattern = "FOUND_IT";
	let changes = format_change_block(search_pattern, replace_pattern);

	// -- Exec
	let result = apply_changes(original.as_str(), changes)?.0;

	// -- Check
	assert_eq!(
		result,
		format!(
			"Content with FOUND_IT inside, and also {LINE_MARKER_SEP} and {LINE_MARKER_REPLACE_END}.", // Only first "<<<<<<< SEARCH" is replaced
		)
	);
	Ok(())
}

#[test]
fn test_support_text_apply_change_block_at_eof_no_trailing_newline_in_changes_input() -> Result {
	// -- Setup & Fixtures
	let original = "fix this";
	// format_change_block ensures markers are on their own lines.
	// The `changes_str` itself might not have a final newline after the last marker line.
	// This is handled fine by `lines()` iterator.
	let changes_str_no_final_newline = format_change_block("this", "that");

	// -- Exec
	let result = apply_changes(original, changes_str_no_final_newline)?.0;

	// -- Check
	assert_eq!(result, "fix that");
	Ok(())
}

#[test]
fn test_support_text_apply_change_empty_changes_string() -> Result {
	// -- Setup & Fixtures
	let original = "original content";
	let changes = "".to_string();

	// -- Exec
	let result = apply_changes(original, changes)?.0;

	// -- Check
	// Empty changes string -> simple replace mode -> replaces original with ""
	assert_eq!(result, "");
	Ok(())
}

#[test]
fn test_support_text_apply_change_changes_is_just_search_start_marker_line() -> Result {
	// -- Setup & Fixtures
	let original = "original";
	let changes = LINE_MARKER_SEARCH_START.to_string(); // Just one line: "<<<<<<< SEARCH"

	// -- Exec
	let result = apply_changes(original, changes);

	// -- Check
	assert!(result.is_err());
	if let Err(e) = result {
		// Ends in search pattern, missing separator
		assert!(e.to_string().contains(&format!("Missing separator marker '{LINE_MARKER_SEP}'")));
	}
	Ok(())
}

#[test]
fn test_support_text_apply_change_changes_is_incomplete_block_missing_replace_text_and_end_marker() -> Result {
	// -- Setup & Fixtures
	let original = "original";
	let changes = format!("{LINE_MARKER_SEARCH_START}\nsearch_text\n{LINE_MARKER_SEP}");
	// Lines: "<<<<<<< SEARCH", "search_text", "======="

	// -- Exec
	let result = apply_changes(original, changes);

	// -- Check
	assert!(result.is_err());
	if let Err(e) = result {
		// Ends in replace pattern (empty), missing end marker
		assert!(
			e.to_string()
				.contains(&format!("Missing end marker '{LINE_MARKER_REPLACE_END}'"))
		);
	}
	Ok(())
}

#[test]
fn test_support_text_apply_change_empty_search_pattern_in_block() -> Result {
	// -- Setup & Fixtures
	let original = "abc def";
	let changes = format_change_block("", "X-"); // search="", replace="X-"

	// -- Exec
	let result = apply_changes(original, changes)?.0;

	// -- Check
	assert_eq!(result, "X-abc def");
	Ok(())
}

#[test]
fn test_support_text_apply_change_empty_replace_pattern_in_block() -> Result {
	// -- Setup & Fixtures
	let original = "abc remove_this def";
	let changes = format_change_block("remove_this", ""); // search="remove_this", replace=""

	// -- Exec
	let result = apply_changes(original, changes)?.0;

	// -- Check
	assert_eq!(result, "abc  def");
	Ok(())
}

#[test]
fn test_support_text_apply_change_multiline_search_and_replace() -> Result {
	// -- Setup & Fixtures
	let original = "line one\nline two\nline three\nline four";
	let search = "line two\nline three";
	let replace = "new line A\nnew line B";
	let changes = format_change_block(search, replace);

	// -- Exec
	let result = apply_changes(original, changes)?.0;

	// -- Check
	assert_eq!(result, "line one\nnew line A\nnew line B\nline four");
	Ok(())
}

#[test]
fn test_support_text_apply_change_crlf_windows() -> Result {
	// -- Setup & Fixtures
	let original = "line one\nline two\nline three\nline four";
	let original = original.replace("\n", "\r\n");
	let search = "line two\nline three";
	let replace = "new line A\nnew line B";
	let changes = format_change_block(search, replace);

	// -- Exec
	let result = apply_changes(&original, changes)?.0;

	// -- Check
	assert_eq!(result, "line one\nnew line A\nnew line B\nline four");

	Ok(())
}