package webingress

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

func TestHTTPSHandlerBlocksUnknownServiceClass(t *testing.T) {
	runtime := Runtime{
		Config: RuntimeConfig{
			ServiceType:    "public-ingress",
			Scope:          "organization",
			ServiceClasses: []string{"public-ingress", "public-ingress"},
		},
		Now: fixedNow,
	}
	req := httptest.NewRequest(http.MethodGet, "https://org.example.test/admin/root", nil)
	rec := httptest.NewRecorder()

	runtime.HTTPSHandler().ServeHTTP(rec, req)

	if rec.Code != http.StatusForbidden {
		t.Fatalf("status = %d body=%s", rec.Code, rec.Body.String())
	}
	var payload Response
	if err := json.Unmarshal(rec.Body.Bytes(), &payload); err != nil {
		t.Fatalf("decode response: %v", err)
	}
	if payload.Reason != "service_class_not_allowed" || payload.ServiceClass != "admin-ingress" || payload.Scope != "organization" {
		t.Fatalf("payload = %+v", payload)
	}
}

func TestHTTPSHandlerRequiresFabricServiceChannelBinding(t *testing.T) {
	runtime := Runtime{
		Config: RuntimeConfig{
			ServiceType:    "admin-ingress",
			Scope:          "platform",
			ServiceClasses: []string{"admin-ingress", "admin-ingress"},
		},
		Now: fixedNow,
	}
	req := httptest.NewRequest(http.MethodPost, "https://admin.example.test/admin/root", nil)
	rec := httptest.NewRecorder()

	runtime.HTTPSHandler().ServeHTTP(rec, req)

	if rec.Code != http.StatusNotImplemented {
		t.Fatalf("status = %d body=%s", rec.Code, rec.Body.String())
	}
	var payload Response
	if err := json.Unmarshal(rec.Body.Bytes(), &payload); err != nil {
		t.Fatalf("decode response: %v", err)
	}
	if payload.Reason != "fabric_service_channel_binding_not_implemented" ||
		payload.ServiceClass != "admin-ingress" ||
		payload.ObservedAt != "2026-05-17T00:00:00Z" {
		t.Fatalf("payload = %+v", payload)
	}
}

func TestHTTPSHandlerForwardsAllowedRequestToBinder(t *testing.T) {
	binder := &recordingBinder{
		response: FabricResponse{
			StatusCode: http.StatusAccepted,
			Headers:    http.Header{"X-RAP-Result": []string{"accepted"}},
			Body:       []byte(`{"ok":true}`),
		},
	}
	runtime := Runtime{
		Config: RuntimeConfig{
			ServiceType:    "admin-ingress",
			Scope:          "platform",
			ServiceClasses: []string{"admin-ingress", "admin-ingress"},
		},
		Binder: binder,
		Now:    fixedNow,
	}
	req := httptest.NewRequest(http.MethodPost, "https://admin.example.test/admin/root?tab=nodes", strings.NewReader(`{"hello":"world"}`))
	req.Header.Set("X-RAP-Service-Class", "admin-ingress")
	req.Header.Set("Authorization", "Bearer secret")
	req.Header.Set("X-Trace-ID", "trace-1")
	rec := httptest.NewRecorder()

	runtime.HTTPSHandler().ServeHTTP(rec, req)

	if rec.Code != http.StatusAccepted {
		t.Fatalf("status = %d body=%s", rec.Code, rec.Body.String())
	}
	if rec.Header().Get("X-RAP-Result") != "accepted" || rec.Body.String() != `{"ok":true}` {
		t.Fatalf("unexpected response headers=%v body=%s", rec.Header(), rec.Body.String())
	}
	if binder.request.ServiceClass != "admin-ingress" ||
		binder.request.Scope != "platform" ||
		binder.request.Path != "/admin/root" ||
		binder.request.Query != "tab=nodes" ||
		string(binder.request.Body) != `{"hello":"world"}` {
		t.Fatalf("request = %+v", binder.request)
	}
	if binder.request.Headers.Get("Authorization") != "" || binder.request.Headers.Get("X-Trace-ID") != "trace-1" {
		t.Fatalf("headers = %#v", binder.request.Headers)
	}
}

func TestHTTPSHandlerDerivesFabricScopeFromServiceClass(t *testing.T) {
	binder := &recordingBinder{response: FabricResponse{StatusCode: http.StatusOK}}
	runtime := Runtime{
		Config: RuntimeConfig{
			ServiceType:    "admin-ingress",
			Scope:          "platform",
			ServiceClasses: []string{"admin-ingress", "admin-ingress"},
		},
		Binder: binder,
		Now:    fixedNow,
	}
	req := httptest.NewRequest(http.MethodGet, "https://admin.example.test/clusters/ui-manifest", nil)
	rec := httptest.NewRecorder()

	runtime.HTTPSHandler().ServeHTTP(rec, req)

	if rec.Code != http.StatusOK {
		t.Fatalf("status = %d body=%s", rec.Code, rec.Body.String())
	}
	if binder.request.ServiceClass != "admin-ingress" || binder.request.Scope != "cluster" {
		t.Fatalf("request = %+v", binder.request)
	}
}

func TestHTTPSHandlerReportsBinderFailure(t *testing.T) {
	runtime := Runtime{
		Config: RuntimeConfig{ServiceType: "admin-ingress", Scope: "platform", ServiceClasses: []string{"admin-ingress"}},
		Binder: failingBinder{},
		Now:    fixedNow,
	}
	req := httptest.NewRequest(http.MethodPost, "https://admin.example.test/admin/root", nil)
	rec := httptest.NewRecorder()

	runtime.HTTPSHandler().ServeHTTP(rec, req)

	if rec.Code != http.StatusBadGateway {
		t.Fatalf("status = %d body=%s", rec.Code, rec.Body.String())
	}
	var payload Response
	if err := json.Unmarshal(rec.Body.Bytes(), &payload); err != nil {
		t.Fatalf("decode response: %v", err)
	}
	if payload.Reason != "fabric_service_channel_forward_failed" {
		t.Fatalf("payload = %+v", payload)
	}
}

func TestHTTPSHandlerHealth(t *testing.T) {
	runtime := Runtime{Config: RuntimeConfig{ServiceType: "admin-ingress", Scope: "platform"}, Now: fixedNow}
	req := httptest.NewRequest(http.MethodGet, "https://admin.example.test/healthz", nil)
	rec := httptest.NewRecorder()

	runtime.HTTPSHandler().ServeHTTP(rec, req)

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

func fixedNow() time.Time {
	return time.Date(2026, 5, 17, 0, 0, 0, 0, time.UTC)
}

type recordingBinder struct {
	request  FabricRequest
	response FabricResponse
}

func (b *recordingBinder) Forward(_ context.Context, request FabricRequest) (FabricResponse, error) {
	b.request = request
	return b.response, nil
}

type failingBinder struct{}

func (failingBinder) Forward(context.Context, FabricRequest) (FabricResponse, error) {
	return FabricResponse{}, errTestBinderFailure{}
}

type errTestBinderFailure struct{}

func (errTestBinderFailure) Error() string { return "binder failed" }