package core

type BufferOptions struct {
	// tabstop expandtab
}

type Buffer struct {
	// Buffer data
	Id int

	// File data
	Filename string
	Filetype string
	Lines    []string

	// Flags (not used yet)
	Modified bool
	Loaded   bool
	Listed   bool

	// Options BufferOptions
	// UndoTree TODO: This will be big
}

// ==================================================
// Helper methods
// ==================================================

// Buffer.Line: Get the line at an index. Returns an empty string if the index
// is out of bounds.
func (b *Buffer) Line(idx int) string {
	if idx < 0 || idx >= len(b.Lines) {
		return ""
	}
	return b.Lines[idx]
}

// Buffer.SetLine: Set the content of the line at an index. Does nothing if the
// index is out of bounds.
func (b *Buffer) SetLine(idx int, content string) {
	if idx >= 0 && idx < len(b.Lines) {
		b.Lines[idx] = content
	}
}

// Buffer.InsertLine: Insert a line with content at an index. The index is clamped
// to valid bounds (0 to len(Lines)). The new line is inserted before the line at
// the given index.
func (b *Buffer) InsertLine(idx int, content string) {
	if idx < 0 {
		idx = 0
	}
	if idx > len(b.Lines) {
		idx = len(b.Lines)
	}
	b.Lines = append(b.Lines[:idx], append([]string{content}, b.Lines[idx:]...)...)
}

// Buffer.DeleteLine: Delete a line at an index. Does nothing if the index is out
// of bounds.
func (b *Buffer) DeleteLine(idx int) {
	if idx >= 0 && idx < len(b.Lines) {
		b.Lines = append(b.Lines[:idx], b.Lines[idx+1:]...)
	}
}

// Buffer.LineCount: Get the number of lines in the buffer.
func (b *Buffer) LineCount() int {
	return len(b.Lines)
}

// ==================================================
// Setters
// ==================================================

// Buffer.SetFilename: Set the filename associated with this buffer. This is
// typically the path to the file on disk that this buffer represents.
func (b *Buffer) SetFilename(filename string) {
	b.Filename = filename
}

// Buffer.SetFiletype: Set the filetype of this buffer. The filetype is used
// for syntax highlighting and other language-specific features.
func (b *Buffer) SetFiletype(filetype string) {
	b.Filetype = filetype
}

// Buffer.SetLines: Replace all lines in the buffer with the provided lines.
// This is useful when loading a file or resetting buffer content.
func (b *Buffer) SetLines(lines []string) {
	b.Lines = lines
}

// Buffer.SetModified: Set the modified flag for this buffer. A modified buffer
// has unsaved changes that differ from the file on disk.
func (b *Buffer) SetModified(modified bool) {
	b.Modified = modified
}

// Buffer.SetLoaded: Set the loaded flag for this buffer. A loaded buffer has
// its content in memory, while an unloaded buffer exists only as metadata.
func (b *Buffer) SetLoaded(loaded bool) {
	b.Loaded = loaded
}

// Buffer.SetListed: Set the listed flag for this buffer. A listed buffer appears
// in buffer lists (like :ls), while an unlisted buffer is hidden from normal
// buffer navigation.
func (b *Buffer) SetListed(listed bool) {
	b.Listed = listed
}