package ledger_test

import (
	"testing"
	"time"

	"github.com/alpacahq/alpacadecimal"
	"github.com/stretchr/testify/require"

	"github.com/openmeterio/openmeter/openmeter/ledger"
	"github.com/openmeterio/openmeter/openmeter/ledger/transactions/testutils"
	"github.com/openmeterio/openmeter/pkg/currencyx"
	"github.com/openmeterio/openmeter/pkg/models"
)

// This package aims to test if the primitive API is convenient to work with

type exampleEntryInput struct {
	account ledger.PostingAddress
	amount  alpacadecimal.Decimal
}

func (e exampleEntryInput) PostingAddress() ledger.PostingAddress {
	return e.account
}

func (e exampleEntryInput) Amount() alpacadecimal.Decimal {
	return e.amount
}

func (e exampleEntryInput) IdentityKey() string {
	return ""
}

func (e exampleEntryInput) SchemaVersion() ledger.EntrySchemaVersion {
	return ledger.EntrySchemaVersionCurrent
}

func (e exampleEntryInput) SourceChargeID() *string {
	return nil
}

func (e exampleEntryInput) SpendChargeID() *string {
	return nil
}

func (e exampleEntryInput) Annotations() models.Annotations {
	return nil
}

var _ ledger.EntryInput = exampleEntryInput{}

func TestTwoAccountTransaction(t *testing.T) {
	t.Skipf("This is just to assert the types, it would fail on unimplemented")

	var l ledger.Ledger
	var a1, a2 ledger.SubAccount

	// Let's create a TX between two accounts
	txInput := &testutils.AnyTransactionInput{
		BookedAtValue: time.Now(),
		EntryInputsValues: []*testutils.AnyEntryInput{
			{
				Address:     a1.Address(),
				AmountValue: alpacadecimal.NewFromInt(-100),
			},
			{
				Address:     a2.Address(),
				AmountValue: alpacadecimal.NewFromInt(100),
			},
		},
	}

	_, err := l.CommitGroup(t.Context(), txInput.AsGroupInput("namespace", nil))
	require.NoError(t, err)
}

func TestMultiAccountTransaction(t *testing.T) {
	t.Skipf("This is just to assert the types, it would fail on unimplemented")

	var a1, a2, a3 ledger.SubAccount

	// Let's create a TX between multiple
	txInput := &testutils.AnyTransactionInput{
		BookedAtValue: time.Now(),
		EntryInputsValues: []*testutils.AnyEntryInput{
			{
				Address:     a1.Address(),
				AmountValue: alpacadecimal.NewFromInt(-100),
			},
			{
				Address:     a2.Address(),
				AmountValue: alpacadecimal.NewFromInt(50),
			},
			{
				Address:     a3.Address(),
				AmountValue: alpacadecimal.NewFromInt(49),
			},
		},
	}

	err := ledger.ValidateTransactionInput(t.Context(), txInput)
	require.NoError(t, err)

	// Just an example on checking errors... 99 - 100 <> 0
	found := false
	if issues, err := models.AsValidationIssues(err); err != nil {
		for _, issue := range issues {
			if issue.Code() == ledger.ErrCodeInvalidTransactionTotal {
				// Just
				found = true
			}
		}
	}
	require.True(t, found, "expected validation issue not found, got %v", err)
}

func TestGetAccountBalance(t *testing.T) {
	t.Skipf("This is just to assert the types, it would fail on unimplemented")

	var acc ledger.Account
	var querier ledger.BalanceQuerier

	balance, err := querier.GetAccountBalance(t.Context(), acc, ledger.RouteFilter{
		Currency: currencyx.Code("USD"),
	}, ledger.BalanceQuery{})
	require.NoError(t, err)
	require.NotNil(t, balance)
}

func TestBalanceBucketQueryValidateGroupBy(t *testing.T) {
	require.NoError(t, ledger.BalanceBucketQuery{
		Namespace: "namespace",
		GroupBy: []string{
			ledger.BalanceBucketGroupBySourceChargeID,
			ledger.BalanceBucketGroupBySpendChargeID,
		},
	}.Validate())

	require.Error(t, ledger.BalanceBucketQuery{
		Namespace: "namespace",
		GroupBy:   []string{"unsupported"},
	}.Validate())

	require.Error(t, ledger.BalanceBucketQuery{
		Namespace: "namespace",
		GroupBy: []string{
			ledger.BalanceBucketGroupBySourceChargeID,
			ledger.BalanceBucketGroupBySourceChargeID,
		},
	}.Validate())
}