// This code is part of the Fungus library (http://fungusgames.com) maintained by Chris Gregan (http://twitter.com/gofungus).
// It is released for free under the MIT open source license (https://github.com/snozbot/fungus/blob/master/LICENSE)

using UnityEngine;
using Fungus.Variables;

namespace Fungus.Commands
{
    /// <summary>
    /// Mathematical operations that can be performed on variables.
    /// </summary>
    public enum SetOperator
    {
        /// <summary> = operator. </summary>
        Assign,     // 
        /// <summary> =! operator. </summary>
        Negate,
        /// <summary> += operator. </summary>
        Add,
        /// <summary> -= operator. </summary>
        Subtract,
        /// <summary> *= operator. </summary>
        Multiply,
        /// <summary> /= operator. </summary>
        Divide
    }

    /// <summary>
    /// Sets a Boolean, Integer, Float or String variable to a new value using a simple arithmetic operation. The value can be a constant or reference another variable of the same type.
    /// </summary>
    [CommandInfo("Variable", 
                 "Set Variable", 
                 "Sets a Boolean, Integer, Float or String variable to a new value using a simple arithmetic operation. The value can be a constant or reference another variable of the same type.")]
    [AddComponentMenu("")]
    public class SetVariable : Command 
    {
        [Tooltip("The variable whos value will be set")]
        [VariableProperty(typeof(BooleanVariable),
                          typeof(IntegerVariable), 
                          typeof(FloatVariable), 
                          typeof(StringVariable))]
        [SerializeField] protected Variable variable;

        [Tooltip("The type of math operation to be performed")]
        [SerializeField] protected SetOperator setOperator;
        public virtual SetOperator _SetOperator { get { return setOperator; } }

        [Tooltip("Boolean value to set with")]
        [SerializeField] protected BooleanData booleanData;

        [Tooltip("Integer value to set with")]
        [SerializeField] protected IntegerData integerData;

        [Tooltip("Float value to set with")]
        [SerializeField] protected FloatData floatData;

        [Tooltip("String value to set with")]
        [SerializeField] protected StringDataMulti stringData;
        
        public override void OnEnter()
        {
            DoSetOperation();

            Continue();
        }

        public override string GetSummary()
        {
            if (variable == null)
            {
                return "Error: Variable not selected";
            }

            string description = variable.Key;

            switch (setOperator)
            {
            default:
            case SetOperator.Assign:
                description += " = ";
                break;
            case SetOperator.Negate:
                description += " =! ";
                break;
            case SetOperator.Add:
                description += " += ";
                break;
            case SetOperator.Subtract:
                description += " -= ";
                break;
            case SetOperator.Multiply:
                description += " *= ";
                break;
            case SetOperator.Divide:
                description += " /= ";
                break;
            }

            if (variable.GetType() == typeof(BooleanVariable))
            {
                description += booleanData.GetDescription();
            }
            else if (variable.GetType() == typeof(IntegerVariable))
            {
                description += integerData.GetDescription();
            }
            else if (variable.GetType() == typeof(FloatVariable))
            {
                description += floatData.GetDescription();
            }
            else if (variable.GetType() == typeof(StringVariable))
            {
                description += stringData.GetDescription();
            }

            return description;
        }

        public override bool HasReference(Variable variable)
        {
            return (variable == this.variable);
        }

        public override Color GetButtonColor()
        {
            return new Color32(253, 253, 150, 255);
        }

        protected virtual void DoSetOperation()
        {
            if (variable == null)
            {
                return;
            }

            if (variable.GetType() == typeof(BooleanVariable))
            {
                BooleanVariable lhs = (variable as BooleanVariable);
                bool rhs = booleanData.Value;
                
                switch (setOperator)
                {
                default:
                case SetOperator.Assign:
                    lhs.Value = rhs;
                    break;
                case SetOperator.Negate:
                    lhs.Value = !rhs;
                    break;
                }
            }
            else if (variable.GetType() == typeof(IntegerVariable))
            {
                IntegerVariable lhs = (variable as IntegerVariable);
                int rhs = integerData.Value;
                
                switch (setOperator)
                {
                default:
                case SetOperator.Assign:
                    lhs.Value = rhs;
                    break;
                case SetOperator.Add:
                    lhs.Value += rhs;
                    break;
                case SetOperator.Subtract:
                    lhs.Value -= rhs;
                    break;
                case SetOperator.Multiply:
                    lhs.Value *= rhs;
                    break;
                case SetOperator.Divide:
                    lhs.Value /= rhs;
                    break;
                }
            }
            else if (variable.GetType() == typeof(FloatVariable))
            {
                FloatVariable lhs = (variable as FloatVariable);
                float rhs = floatData.Value;
                
                switch (setOperator)
                {
                default:
                case SetOperator.Assign:
                    lhs.Value = rhs;
                    break;
                case SetOperator.Add:
                    lhs.Value += rhs;
                    break;
                case SetOperator.Subtract:
                    lhs.Value -= rhs;
                    break;
                case SetOperator.Multiply:
                    lhs.Value *= rhs;
                    break;
                case SetOperator.Divide:
                    lhs.Value /= rhs;
                    break;
                }
            }
            else if (variable.GetType() == typeof(StringVariable))
            {
                StringVariable lhs = (variable as StringVariable);
                string rhs = stringData.Value;
                
                switch (setOperator)
                {
                default:
                case SetOperator.Assign:
                    lhs.Value = rhs;
                    break;
                }
            }
        }
    }
}