package httpapi

import (
	"net/http"
	"net/http/httptest"
	"strings"
	"testing"
)

func TestDecodeJSONRejectsTrailingContent(t *testing.T) {
	r := httptest.NewRequest(http.MethodPost, "/x", strings.NewReader(`{"name":"ok"}{"extra":true}`))

	var body struct {
		Name string `json:"name"`
	}
	err := DecodeJSON(r, &body)
	if err == nil {
		t.Fatal("expected trailing content error")
	}
	if err != errJSONTrailingContent {
		t.Fatalf("unexpected error: %v", err)
	}
}

func TestDecodeJSONOptionalAllowsEmptyBody(t *testing.T) {
	r := httptest.NewRequest(http.MethodPost, "/x", http.NoBody)

	var body struct {
		Name string `json:"name"`
	}
	if err := DecodeJSONOptional(r, &body); err != nil {
		t.Fatalf("expected empty body to be allowed, got %v", err)
	}
}

func TestDecodeJSONOptionalRejectsMalformedJSON(t *testing.T) {
	r := httptest.NewRequest(http.MethodPost, "/x", strings.NewReader(`{"name":`))

	var body struct {
		Name string `json:"name"`
	}
	if err := DecodeJSONOptional(r, &body); err == nil {
		t.Fatal("expected malformed json error")
	}
}

// SPA start-job payload includes processing_types alongside processing_type.
// DecodeJSON DisallowUnknownFields must accept both or POST /api/processing/jobs returns 400.
func TestDecodeJSONAcceptsStartJobSPAPayload(t *testing.T) {
	payload := `{"raw_product_ids":["11111111-1111-1111-1111-111111111111"],"processing_type":"full","processing_types":["category","title"]}`
	r := httptest.NewRequest(http.MethodPost, "/api/processing/jobs", strings.NewReader(payload))

	var body startProcessingJobRequest
	if err := DecodeJSON(r, &body); err != nil {
		t.Fatalf("expected SPA start-job payload to decode, got %v", err)
	}
	if body.ProcessingType != "full" {
		t.Fatalf("processing_type = %q", body.ProcessingType)
	}
	if len(body.RawProductIDs) != 1 || len(body.ProcessingTypes) != 2 {
		t.Fatalf("unexpected body: %+v", body)
	}
}

func TestDecodeJSONRejectsUnknownStartJobField(t *testing.T) {
	r := httptest.NewRequest(http.MethodPost, "/x", strings.NewReader(`{"raw_product_ids":[],"processing_type":"full","unknown":true}`))

	var body startProcessingJobRequest
	if err := DecodeJSON(r, &body); err == nil {
		t.Fatal("expected unknown field to be rejected")
	}
}