package syntax

import (
	"fmt"
	"testing"

	"git.gophernest.net/azpect/TextEditor/internal/core"
	"git.gophernest.net/azpect/TextEditor/internal/theme/themes"
)

func BenchmarkTreeSitterPrepareAndIncrementalEdit(b *testing.B) {
	lines := make([]string, 0, 2000)
	lines = append(lines, "package main", "", "func main() {")
	for i := 0; i < 1990; i++ {
		lines = append(lines, fmt.Sprintf("  v%d := %d", i, i))
	}
	lines = append(lines, "}")

	bld := core.NewBufferBuilder().WithFilename("bench.go").WithFiletype("go").WithLines(lines).Build()
	buf := &bld
	editorTheme := themes.NewDefaultTheme()
	eng := NewTreeSitterEngine(editorTheme)

	eng.PrepareBuffer(buf, editorTheme)

	b.ResetTimer()
	for i := 0; i < b.N; i++ {
		lineIdx := 10 + (i % 1000)
		buf.SetLine(lineIdx, fmt.Sprintf("  v%d := %d", lineIdx, i))

		oldSource := buildBufferSource(buf)
		_ = oldSource

		// Synthetic direct invalidate path benchmark (current API entrypoints)
		eng.InvalidateLines(buf, lineIdx, lineIdx)
		eng.PrepareBuffer(buf, editorTheme)
	}
}