package model

import (
	"database/sql"
	"testing"
)

func TestFinanceCategory_ProcessForJSON(t *testing.T) {
	tests := []struct {
		name      string
		budget    sql.NullFloat64
		wantNil   bool
		wantValue float64
	}{
		{
			name:      "with valid budget",
			budget:    sql.NullFloat64{Float64: 5000.0, Valid: true},
			wantNil:   false,
			wantValue: 5000.0,
		},
		{
			name:    "with null budget",
			budget:  sql.NullFloat64{Valid: false},
			wantNil: true,
		},
		{
			name:      "with zero valid budget",
			budget:    sql.NullFloat64{Float64: 0, Valid: true},
			wantNil:   false,
			wantValue: 0,
		},
		{
			name:      "with negative budget",
			budget:    sql.NullFloat64{Float64: -100.5, Valid: true},
			wantNil:   false,
			wantValue: -100.5,
		},
	}

	for _, tt := range tests {
		t.Run(tt.name, func(t *testing.T) {
			c := &FinanceCategory{Budget: tt.budget}
			c.ProcessForJSON()
			if tt.wantNil {
				if c.BudgetVal != nil {
					t.Errorf("expected nil BudgetVal, got %v", *c.BudgetVal)
				}
			} else {
				if c.BudgetVal == nil {
					t.Fatal("expected non-nil BudgetVal")
				}
				if *c.BudgetVal != tt.wantValue {
					t.Errorf("expected %.2f, got %.2f", tt.wantValue, *c.BudgetVal)
				}
			}
		})
	}
}