package membership

import (
	"context"
	"errors"
	"log/slog"
	"net/http"
	"net/http/httptest"
	"testing"

	"proxui/backend/internal/auth"
	"proxui/backend/internal/rbac"
)

func TestRequireTenantMembershipStoresMembership(t *testing.T) {
	resolver := &stubResolver{
		membership: Membership{
			TenantID: "tenant-1",
			Role:     rbac.RoleAdmin,
		},
		found: true,
	}
	middleware := NewMiddleware(resolver, slog.Default())
	handler := middleware.RequireTenantMembership(staticTenantID("tenant-1"), http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
		membership, ok := FromRequest(r)
		if !ok {
			t.Fatal("membership missing from request")
		}
		if membership.TenantID != "tenant-1" {
			t.Fatalf("tenant id = %q, want tenant-1", membership.TenantID)
		}
		if membership.Role != rbac.RoleAdmin {
			t.Fatalf("role = %q, want %q", membership.Role, rbac.RoleAdmin)
		}
		w.WriteHeader(http.StatusNoContent)
	}))

	req := requestWithPrincipal()
	rec := httptest.NewRecorder()

	handler.ServeHTTP(rec, req)

	if rec.Code != http.StatusNoContent {
		t.Fatalf("status = %d, want %d", rec.Code, http.StatusNoContent)
	}
	if resolver.profileID != "profile-1" {
		t.Fatalf("profile id = %q, want profile-1", resolver.profileID)
	}
	if resolver.tenantID != "tenant-1" {
		t.Fatalf("tenant id = %q, want tenant-1", resolver.tenantID)
	}
}

func TestRequireTenantMembershipRejectsMissingPrincipal(t *testing.T) {
	resolver := &stubResolver{found: true}
	middleware := NewMiddleware(resolver, slog.Default())
	handler := middleware.RequireTenantMembership(staticTenantID("tenant-1"), http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
		w.WriteHeader(http.StatusNoContent)
	}))

	req := httptest.NewRequest(http.MethodGet, "/tenants/tenant-1/membership", nil)
	rec := httptest.NewRecorder()

	handler.ServeHTTP(rec, req)

	if rec.Code != http.StatusUnauthorized {
		t.Fatalf("status = %d, want %d", rec.Code, http.StatusUnauthorized)
	}
	if resolver.calls != 0 {
		t.Fatalf("resolver calls = %d, want 0", resolver.calls)
	}
}

func TestRequireTenantMembershipRejectsMissingTenantID(t *testing.T) {
	resolver := &stubResolver{found: true}
	middleware := NewMiddleware(resolver, slog.Default())
	handler := middleware.RequireTenantMembership(func(*http.Request) (string, bool) {
		return "", false
	}, http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
		w.WriteHeader(http.StatusNoContent)
	}))

	req := requestWithPrincipal()
	rec := httptest.NewRecorder()

	handler.ServeHTTP(rec, req)

	if rec.Code != http.StatusBadRequest {
		t.Fatalf("status = %d, want %d", rec.Code, http.StatusBadRequest)
	}
	if resolver.calls != 0 {
		t.Fatalf("resolver calls = %d, want 0", resolver.calls)
	}
}

func TestRequireTenantMembershipRejectsNonMember(t *testing.T) {
	resolver := &stubResolver{found: false}
	middleware := NewMiddleware(resolver, slog.Default())
	handler := middleware.RequireTenantMembership(staticTenantID("tenant-1"), http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
		w.WriteHeader(http.StatusNoContent)
	}))

	req := requestWithPrincipal()
	rec := httptest.NewRecorder()

	handler.ServeHTTP(rec, req)

	if rec.Code != http.StatusForbidden {
		t.Fatalf("status = %d, want %d", rec.Code, http.StatusForbidden)
	}
}

func TestRequireTenantMembershipReturnsServerErrorOnResolverFailure(t *testing.T) {
	resolver := &stubResolver{err: errors.New("db failed")}
	middleware := NewMiddleware(resolver, slog.Default())
	handler := middleware.RequireTenantMembership(staticTenantID("tenant-1"), http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
		w.WriteHeader(http.StatusNoContent)
	}))

	req := requestWithPrincipal()
	rec := httptest.NewRecorder()

	handler.ServeHTTP(rec, req)

	if rec.Code != http.StatusInternalServerError {
		t.Fatalf("status = %d, want %d", rec.Code, http.StatusInternalServerError)
	}
}

func requestWithPrincipal() *http.Request {
	req := httptest.NewRequest(http.MethodGet, "/tenants/tenant-1/membership", nil)
	return req.WithContext(auth.ContextWithPrincipal(req.Context(), auth.Principal{
		Subject: "profile-1",
		Email:   "user@example.test",
		Role:    "authenticated",
	}))
}

func staticTenantID(tenantID string) TenantIDExtractor {
	return func(*http.Request) (string, bool) {
		return tenantID, true
	}
}

type stubResolver struct {
	calls      int
	profileID  string
	tenantID   string
	membership Membership
	found      bool
	err        error
}

func (s *stubResolver) ResolveTenantMembership(_ context.Context, profileID string, tenantID string) (Membership, bool, error) {
	s.calls++
	s.profileID = profileID
	s.tenantID = tenantID
	return s.membership, s.found, s.err
}