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path: root/internal/lsp/debounce_throttle_test.go
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package lsp

import (
    "context"
    "encoding/json"
    "testing"
    "time"
    "codeberg.org/snonux/hexai/internal/llm"
)

// timeLLM records the time when Chat is invoked.
type timeLLM struct{ t time.Time }

func (t *timeLLM) Chat(ctx context.Context, _ []llm.Message, _ ...llm.RequestOption) (string, error) {
    t.t = time.Now()
    return "ok", nil
}
func (t *timeLLM) Name() string         { return "fake" }
func (t *timeLLM) DefaultModel() string { return "m" }

func TestCompletionDebounce_WaitsUntilQuiet(t *testing.T) {
    s := newTestServer()
    s.compCache = make(map[string]string)
    s.triggerChars = []string{".", ":", "/", "_"}
    s.maxTokens = 32
    s.completionDebounce = 30 * time.Millisecond
    s.markActivity() // simulate recent input

    f := &timeLLM{}
    s.llmClient = f

    line := "func f(i int) "
    p := CompletionParams{Position: Position{Line: 0, Character: len(line)}, TextDocument: TextDocumentIdentifier{URI: "file://debounce.go"}}
    p.Context = json.RawMessage([]byte(`{"triggerKind":1}`))

    start := time.Now()
    _, ok := s.tryLLMCompletion(p, "", line, "", "", "", false, "")
    if !ok {
        t.Fatalf("expected ok=true")
    }
    if f.t.IsZero() {
        t.Fatalf("expected LLM to be called")
    }
    if f.t.Sub(start) < 25*time.Millisecond { // allow minor timing noise
        t.Fatalf("expected debounce delay, got %s", f.t.Sub(start))
    }
}

func TestCompletionThrottle_SerializesCalls(t *testing.T) {
    s := newTestServer()
    s.compCache = make(map[string]string)
    s.triggerChars = []string{".", ":", "/", "_"}
    s.maxTokens = 32
    s.throttleInterval = 25 * time.Millisecond

    // first call uses timeLLM to record time
    f1 := &timeLLM{}
    s.llmClient = f1
    line := "func f(i int) "
    p := CompletionParams{Position: Position{Line: 0, Character: len(line)}, TextDocument: TextDocumentIdentifier{URI: "file://throttle.go"}}
    p.Context = json.RawMessage([]byte(`{"triggerKind":1}`))
    start := time.Now()
    if _, ok := s.tryLLMCompletion(p, "", line, "", "", "", false, ""); !ok {
        t.Fatalf("first call expected ok=true")
    }
    if f1.t.IsZero() {
        t.Fatalf("expected first call time recorded")
    }

    // second call immediately after; should be delayed by ~interval.
    // Clear cache to ensure we actually call the LLM again.
    s.compCache = make(map[string]string)
    f2 := &timeLLM{}
    s.llmClient = f2
    if _, ok := s.tryLLMCompletion(p, "", line, "", "", "", false, ""); !ok {
        t.Fatalf("second call expected ok=true")
    }
    if f2.t.IsZero() {
        t.Fatalf("expected second call time recorded")
    }
    if f2.t.Sub(start) < s.throttleInterval {
        t.Fatalf("expected throttle spacing >= %s, got %s", s.throttleInterval, f2.t.Sub(start))
    }
}