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package lsp
import (
"context"
"encoding/json"
"io"
"testing"
"codeberg.org/snonux/hexai/internal/llm"
)
// fakeCompleterErr implements both Client and CodeCompleter; CodeCompletion errors,
// forcing tryProviderNativeCompletion to take the error path and fall back to chat.
type fakeCompleterErr struct{}
func (fakeCompleterErr) Chat(context.Context, []llm.Message, ...llm.RequestOption) (string, error) { return "X", nil }
func (fakeCompleterErr) Name() string { return "prov" }
func (fakeCompleterErr) DefaultModel() string { return "m" }
func (fakeCompleterErr) CodeCompletion(context.Context, string, string, int, string, float64) ([]string, error) { return nil, io.EOF }
func TestCompletion_FallbackOnProviderError(t *testing.T) {
s := newTestServer()
s.llmClient = fakeCompleterErr{}
// Provide simple document
uri := "file:///x.go"
s.setDocument(uri, "package p\nfunc f(){\nfmt.\n}\n")
// Position after 'fmt.' to satisfy prefix heuristics
p := CompletionParams{TextDocument: TextDocumentIdentifier{URI: uri}, Position: Position{Line:2, Character:4}}
// Build context for trigger character '.'
ctx := struct{ TriggerKind int `json:"triggerKind"`; TriggerCharacter string `json:"triggerCharacter"` }{TriggerKind: 2, TriggerCharacter: "."}
bctx, _ := json.Marshal(ctx)
p.Context = json.RawMessage(bctx)
// Call handleCompletion and ensure it returns at least one item from chat fallback
var buf nopWriter
s.out = &buf
s.handleCompletion(Request{JSONRPC: "2.0", ID: json.RawMessage("6"), Method: "textDocument/completion", Params: mustJSON(p)})
// No panic implies path executed; detailed decode not needed here
}
type nopWriter struct{}
func (nopWriter) Write(p []byte) (int, error) { return len(p), nil }
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