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

import (
    "context"
    "errors"
    "testing"

    "hexai/internal/llm"
)

// fakeCodeLLM implements both llm.Client and llm.CodeCompleter.
type fakeCodeLLM struct{
    codeCalls int
    chatCalls int
    result    string
    codeErr   error
}

func (f *fakeCodeLLM) CodeCompletion(_ context.Context, _ string, _ string, n int, _ string, _ float64) ([]string, error) {
    f.codeCalls++
    if f.codeErr != nil { return nil, f.codeErr }
    if n <= 0 { n = 1 }
    out := make([]string, n)
    for i := 0; i < n; i++ { out[i] = f.result }
    return out, nil
}

func (f *fakeCodeLLM) Chat(_ context.Context, _ []llm.Message, _ ...llm.RequestOption) (string, error) {
    f.chatCalls++
    return "chat", nil
}
func (f *fakeCodeLLM) Name() string         { return "fake" }
func (f *fakeCodeLLM) DefaultModel() string { return "m" }

func TestTryLLMCompletion_PrefersCodeCompleterOverChat(t *testing.T) {
    s := &Server{ maxTokens: 32, triggerChars: []string{"."}, compCache: make(map[string]string) }
    fake := &fakeCodeLLM{ result: "DoThing()" }
    s.llmClient = fake
    line := "obj."
    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 { t.Fatalf("expected completion items via CodeCompleter path") }
    if fake.codeCalls == 0 { t.Fatalf("expected CodeCompletion to be called") }
    if fake.chatCalls != 0 { t.Fatalf("did not expect Chat fallback when CodeCompletion succeeds") }
}

func TestTryLLMCompletion_FallsBackToChatOnCodeCompleterError(t *testing.T) {
    s := &Server{ maxTokens: 32, triggerChars: []string{"."}, compCache: make(map[string]string) }
    fake := &fakeCodeLLM{ result: "DoThing()", codeErr: errors.New("boom") }
    s.llmClient = fake
    line := "obj."
    p := CompletionParams{ Position: Position{ Line: 0, Character: len(line) }, TextDocument: TextDocumentIdentifier{URI: "file://y.go"} }
    items, ok := s.tryLLMCompletion(p, "", line, "", "", "", false, "")
    if !ok { t.Fatalf("expected ok=true even on fallback path") }
    if len(items) == 0 { t.Fatalf("expected some items from Chat fallback") }
    if fake.codeCalls == 0 { t.Fatalf("expected CodeCompletion to be attempted first") }
    if fake.chatCalls == 0 { t.Fatalf("expected Chat fallback to be called when CodeCompletion errors") }
}