package domain_test

import (
	"errors"
	"testing"

	"cmbuyer/admin/internal/domain"
)

func TestAuthorizationTransitions(t *testing.T) {
	tests := []struct {
		name    string
		current domain.AuthorizationStatus
		next    domain.AuthorizationStatus
		allowed bool
	}{
		{"deliver", domain.AuthorizationStatusPendingDelivery, domain.AuthorizationStatusDelivered, true},
		{"acknowledge", domain.AuthorizationStatusDelivered, domain.AuthorizationStatusAcknowledged, true},
		{"execute", domain.AuthorizationStatusAcknowledged, domain.AuthorizationStatusExecuting, true},
		{"fence", domain.AuthorizationStatusExecuting, domain.AuthorizationStatusFenced, true},
		{"consume fenced authorization", domain.AuthorizationStatusFenced, domain.AuthorizationStatusConsumed, true},
		{"expire pending delivery", domain.AuthorizationStatusPendingDelivery, domain.AuthorizationStatusExpired, true},
		{"supersede pending delivery", domain.AuthorizationStatusPendingDelivery, domain.AuthorizationStatusSuperseded, true},
		{"expire before fence", domain.AuthorizationStatusExecuting, domain.AuthorizationStatusExpired, true},
		{"supersede before fence", domain.AuthorizationStatusDelivered, domain.AuthorizationStatusSuperseded, true},
		{"fenced authorization cannot expire", domain.AuthorizationStatusFenced, domain.AuthorizationStatusExpired, false},
		{"fenced authorization cannot be superseded", domain.AuthorizationStatusFenced, domain.AuthorizationStatusSuperseded, false},
		{"fenced authorization cannot be delivered again", domain.AuthorizationStatusFenced, domain.AuthorizationStatusDelivered, false},
		{"consumed authorization cannot restart", domain.AuthorizationStatusConsumed, domain.AuthorizationStatusDelivered, false},
	}

	for _, test := range tests {
		t.Run(test.name, func(t *testing.T) {
			if got := test.current.CanTransitionTo(test.next); got != test.allowed {
				t.Fatalf("CanTransitionTo(%s, %s) = %t, want %t", test.current, test.next, got, test.allowed)
			}

			result, err := domain.TransitionAuthorization(test.current, test.next)
			if test.allowed {
				if err != nil {
					t.Fatalf("TransitionAuthorization(%s, %s): %v", test.current, test.next, err)
				}
				if result != test.next {
					t.Fatalf("TransitionAuthorization(%s, %s) = %s, want %s", test.current, test.next, result, test.next)
				}
				return
			}

			if !errors.Is(err, domain.ErrInvalidAuthorizationTransition) {
				t.Fatalf("TransitionAuthorization(%s, %s) error = %v, want ErrInvalidAuthorizationTransition", test.current, test.next, err)
			}
		})
	}
}