package exitcode

import (
	"context"
	"errors"
	"testing"

	"github.com/stretchr/testify/assert"
	"github.com/stretchr/testify/require"
)

func TestClassify(t *testing.T) {
	cases := []struct {
		name string
		err  error
		want Code
	}{
		{"nil", nil, OK},
		{"generic", errors.New("boom"), Generic},
		{"canceled", context.Canceled, Cancelled},
		{"partial", &Error{Code: Partial, Err: errors.New("2 shards failed")}, Partial},
		{"wrapped canceled", wrappedCanceled{}, Cancelled},
	}
	for _, tc := range cases {
		t.Run(tc.name, func(t *testing.T) {
			assert.Equal(t, tc.want, Classify(tc.err))
		})
	}
}

type wrappedCanceled struct{}

func (wrappedCanceled) Error() string { return "wrapped: " + context.Canceled.Error() }
func (wrappedCanceled) Unwrap() error { return context.Canceled }

func TestPartialFailure(t *testing.T) {
	err := PartialFailure(errors.New("3 shards failed"))
	var ee *Error
	require.ErrorAs(t, err, &ee)
	assert.Equal(t, Partial, ee.Code)
	assert.Equal(t, "3 shards failed", ee.Error())
}

func TestCancelledFailure(t *testing.T) {
	inner := errors.New("shut down mid-shard")
	err := CancelledFailure(inner)
	var ee *Error
	require.ErrorAs(t, err, &ee)
	assert.Equal(t, Cancelled, ee.Code)
	assert.Equal(t, Cancelled, Classify(err))
	assert.ErrorIs(t, err, inner)
}