package lsp

import (
	"bytes"
	"log"
	"strings"
	"testing"

	"codeberg.org/snonux/hexai/internal/logging"
)

func TestCompletionCache_IgnoresWhitespaceBeforeCursor(t *testing.T) {
	var buf bytes.Buffer
	logger := log.New(&buf, "", 0)
	s := newTestServer()
	s.logger = logger
	s.out = &buf
	logging.Bind(logger)
	cfg := s.cfg
	cfg.TriggerCharacters = []string{" ", "."}
	s.cfg = cfg
	fake := &countingLLM{}
	s.llmClient = fake

	// First request with trailing spaces before cursor
	line := "foo   "
	p := CompletionParams{Position: Position{Line: 0, Character: len(line)}, TextDocument: TextDocumentIdentifier{URI: "file://x.go"}}
	items, ok, _ := s.tryLLMCompletion(p, "", line, "", "", "", false, "")
	if !ok || len(items) == 0 || fake.calls != 1 {
		t.Fatalf("expected first call to invoke LLM; ok=%v len=%d calls=%d", ok, len(items), fake.calls)
	}

	// Same logical context but with a different amount of trailing whitespace
	line2 := "foo             "
	p2 := CompletionParams{Position: Position{Line: 0, Character: len(line2)}, TextDocument: TextDocumentIdentifier{URI: "file://x.go"}}
	items2, ok2, _ := s.tryLLMCompletion(p2, "", line2, "", "", "", false, "")
	if !ok2 || len(items2) == 0 {
		t.Fatalf("expected cache hit to still return items")
	}
	if fake.calls != 1 {
		t.Fatalf("expected cache hit to avoid LLM call; calls=%d", fake.calls)
	}
	if !strings.Contains(buf.String(), "completion cache hit") {
		t.Fatalf("expected log to contain cache hit message, got: %s", buf.String())
	}
}