package core

import (
	"bytes"
	"encoding/json"
	"net/http"
	"net/http/httptest"
	"strings"
	"testing"
)

func TestHandleSend_AllowsAttachmentOnly(t *testing.T) {
	engine := NewEngine("test", &stubAgent{}, []Platform{&stubMediaPlatform{stubPlatformEngine: stubPlatformEngine{n: "test"}}}, "", LangEnglish)
	engine.interactiveStates["session-1"] = &interactiveState{
		platform: &stubMediaPlatform{stubPlatformEngine: stubPlatformEngine{n: "test"}},
		replyCtx: "reply-ctx",
	}

	api := &APIServer{engines: map[string]*Engine{"test": engine}}
	reqBody := SendRequest{
		Project:    "test",
		SessionKey: "session-1",
		Images: []ImageAttachment{{
			MimeType: "image/png",
			Data:     []byte("img"),
			FileName: "chart.png",
		}},
	}
	body, err := json.Marshal(reqBody)
	if err != nil {
		t.Fatalf("marshal request: %v", err)
	}

	req := httptest.NewRequest(http.MethodPost, "/send", bytes.NewReader(body))
	rec := httptest.NewRecorder()
	api.handleSend(rec, req)

	if rec.Code != http.StatusOK {
		t.Fatalf("status = %d, body=%s", rec.Code, rec.Body.String())
	}
}

// TestHandleSend_UnknownProjectReturns404 ensures the API does NOT silently
// fall back to the only registered engine when the caller named a different
// project. Previously a typo'd project name routed messages to whatever
// single engine happened to be loaded.
func TestHandleSend_UnknownProjectReturns404(t *testing.T) {
	engine := NewEngine("projectA", &stubAgent{}, []Platform{&stubMediaPlatform{stubPlatformEngine: stubPlatformEngine{n: "test"}}}, "", LangEnglish)
	engine.interactiveStates["session-1"] = &interactiveState{
		platform: &stubMediaPlatform{stubPlatformEngine: stubPlatformEngine{n: "test"}},
		replyCtx: "reply-ctx",
	}

	api := &APIServer{engines: map[string]*Engine{"projectA": engine}}
	body, err := json.Marshal(SendRequest{
		Project:    "projectB", // typo; does NOT match the loaded engine
		SessionKey: "session-1",
		Message:    "hi",
	})
	if err != nil {
		t.Fatalf("marshal: %v", err)
	}

	req := httptest.NewRequest(http.MethodPost, "/send", bytes.NewReader(body))
	rec := httptest.NewRecorder()
	api.handleSend(rec, req)

	if rec.Code != http.StatusNotFound {
		t.Fatalf("status = %d, want 404; body=%s", rec.Code, rec.Body.String())
	}
	if !strings.Contains(rec.Body.String(), `"projectB"`) {
		t.Errorf("body should mention the unknown project name, got: %s", rec.Body.String())
	}
}

// TestHandleSend_EmptyProjectFallsBackToSingleEngine documents the intended
// convenience behavior: when the caller omits project entirely AND only one
// engine is loaded, the API picks it automatically.
func TestHandleSend_EmptyProjectFallsBackToSingleEngine(t *testing.T) {
	engine := NewEngine("solo", &stubAgent{}, []Platform{&stubMediaPlatform{stubPlatformEngine: stubPlatformEngine{n: "test"}}}, "", LangEnglish)
	engine.interactiveStates["session-1"] = &interactiveState{
		platform: &stubMediaPlatform{stubPlatformEngine: stubPlatformEngine{n: "test"}},
		replyCtx: "reply-ctx",
	}

	api := &APIServer{engines: map[string]*Engine{"solo": engine}}
	body, err := json.Marshal(SendRequest{
		// Project deliberately omitted.
		SessionKey: "session-1",
		Message:    "hi",
	})
	if err != nil {
		t.Fatalf("marshal: %v", err)
	}

	req := httptest.NewRequest(http.MethodPost, "/send", bytes.NewReader(body))
	rec := httptest.NewRecorder()
	api.handleSend(rec, req)

	if rec.Code != http.StatusOK {
		t.Fatalf("status = %d, want 200; body=%s", rec.Code, rec.Body.String())
	}
}

// TestHandleSend_EmptyProjectMultipleEnginesRequiresName ensures the API
// refuses to guess when more than one engine is loaded and the caller did
// not specify which one to send to.
func TestHandleSend_EmptyProjectMultipleEnginesRequiresName(t *testing.T) {
	engineA := NewEngine("a", &stubAgent{}, []Platform{&stubMediaPlatform{stubPlatformEngine: stubPlatformEngine{n: "test"}}}, "", LangEnglish)
	engineB := NewEngine("b", &stubAgent{}, []Platform{&stubMediaPlatform{stubPlatformEngine: stubPlatformEngine{n: "test"}}}, "", LangEnglish)
	api := &APIServer{engines: map[string]*Engine{"a": engineA, "b": engineB}}

	body, err := json.Marshal(SendRequest{
		SessionKey: "session-1",
		Message:    "hi",
	})
	if err != nil {
		t.Fatalf("marshal: %v", err)
	}

	req := httptest.NewRequest(http.MethodPost, "/send", bytes.NewReader(body))
	rec := httptest.NewRecorder()
	api.handleSend(rec, req)

	if rec.Code != http.StatusBadRequest {
		t.Fatalf("status = %d, want 400; body=%s", rec.Code, rec.Body.String())
	}
}