package contract

import (
	"encoding/json"
	"testing"

	"github.com/google/uuid"
	"github.com/stretchr/testify/require"
)

func TestUpdateCategoryRequestTellsNullFromOmitted(t *testing.T) {
	parentID := uuid.New()

	tests := []struct {
		name          string
		body          string
		wantParentID  *uuid.UUID
		wantClear     bool
		wantClearFee  bool
		wantFee       *float64
		wantNameIsSet bool
	}{
		{name: "omitted leaves parent unchanged", body: `{"name":"Food"}`, wantNameIsSet: true},
		{name: "null detaches the parent", body: `{"parent_id":null}`, wantClear: true},
		{name: "empty string detaches the parent", body: `{"name":"Food","parent_id":""}`, wantClear: true, wantNameIsSet: true},
		{name: "uuid sets the parent", body: `{"parent_id":"` + parentID.String() + `"}`, wantParentID: &parentID},
		{name: "null removes the owner fee override", body: `{"owner_fee_percent":null}`, wantClearFee: true},
		{name: "number sets the owner fee", body: `{"owner_fee_percent":35}`, wantFee: func() *float64 { v := 35.0; return &v }()},
	}

	for _, tt := range tests {
		t.Run(tt.name, func(t *testing.T) {
			var req UpdateCategoryRequest
			require.NoError(t, json.Unmarshal([]byte(tt.body), &req))

			require.Equal(t, tt.wantParentID, req.ParentID)
			require.Equal(t, tt.wantClear, req.ClearParentID)
			require.Equal(t, tt.wantClearFee, req.ClearOwnerFeePercent)
			require.Equal(t, tt.wantFee, req.OwnerFeePercent)
			require.Equal(t, tt.wantNameIsSet, req.Name != nil)
		})
	}
}

func TestUpdateCategoryRequestRejectsInvalidParentID(t *testing.T) {
	var req UpdateCategoryRequest
	require.Error(t, json.Unmarshal([]byte(`{"parent_id":"not-a-uuid"}`), &req))
}