package inbound

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

func TestPostAcceptsAPIResponseLargerThanLegacy64KiB(t *testing.T) {
	payload := strings.Repeat("x", 128*1024)
	server := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, _ *http.Request) {
		w.Header().Set("Content-Type", "application/json")
		_ = json.NewEncoder(w).Encode(map[string]string{"payload": payload})
	}))
	defer server.Close()

	var result struct {
		Payload string `json:"payload"`
	}
	if err := (Server{APIBaseURL: server.URL}).post(context.Background(), "/large", map[string]string{"request": "ok"}, &result); err != nil {
		t.Fatalf("post response larger than 64KiB: %v", err)
	}
	if result.Payload != payload {
		t.Fatalf("payload length = %d, want %d", len(result.Payload), len(payload))
	}
}

func TestPostRejectsAPIResponseBeyondFourMiBWithoutTruncatedJSONError(t *testing.T) {
	server := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, _ *http.Request) {
		w.Header().Set("Content-Type", "application/json")
		_, _ = w.Write([]byte(`{"payload":"` + strings.Repeat("x", int(maxAPIResponseBodyBytes)) + `"}`))
	}))
	defer server.Close()

	var result map[string]any
	err := (Server{APIBaseURL: server.URL}).post(context.Background(), "/too-large", map[string]string{"request": "ok"}, &result)
	if err == nil || !strings.Contains(err.Error(), "api response exceeds 4194304-byte limit") {
		t.Fatalf("error = %v, want explicit response-size error", err)
	}
	if strings.Contains(err.Error(), "unexpected end of JSON input") {
		t.Fatalf("oversized response must not surface as truncated JSON: %v", err)
	}
}