/**
 *  LogarithmPlotter - 2D plotter software to make BODE plots, sequences and repartition functions.
 *  Copyright (C) 2022  Ad5001
 * 
 *  This program is free software: you can redistribute it and/or modify
 *  it under the terms of the GNU General Public License as published by
 *  the Free Software Foundation, either version 3 of the License, or
 *  (at your option) any later version.
 * 
 *  This program is distributed in the hope that it will be useful,
 *  but WITHOUT ANY WARRANTY; without even the implied warranty of
 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *  GNU General Public License for more details.
 * 
 *  You should have received a copy of the GNU General Public License
 *  along with this program.  If not, see <https://www.gnu.org/licenses/>.
 */

// This library helps containing actions to be undone or redone (in other words, editing history)
// Each type of event is repertoried as an action that can be listed for everything that's undoable.
.pragma library

.import "objects.js" as Objects
.import "objs/common.js" as Common
.import "utils.js" as Utils
.import "mathlib.js" as MathLib

var history = null;

class Action {
    // Type of the action done.
    type(){return 'Unknown'}
    
    // TargetName is the name of the object that's targeted by the event.
    constructor(targetName = "", targetType = "Point") {
        this.targetName = targetName
        this.targetType = targetType
    }
    
    undo() {}
    
    redo() {}
    
    export() {
        return [this.targetName, this.targetType]
    }
    
    getReadableString() {
        return 'Unknown action'
    }
}

class CreateNewObject extends Action {
    // Action used for the creation of an object
    type(){return 'CreateNewObject'}
    
    constructor(targetName = "", targetType = "Point", properties = []) {
        super(targetName, targetType)
        this.targetProperties = properties
    }

    
    undo() {
        var targetIndex = Objects.getObjectsName(this.targetType).indexOf(this.targetName)
        Objects.currentObjects[this.targetType][targetIndex].delete()
        Objects.currentObjects[this.targetType].splice(targetIndex, 1)
    }
    
    redo() {
        Objects.createNewRegisteredObject(this.targetType, this.targetProperties)
    }
    
    export() {
        return [this.targetName, this.targetType, this.targetProperties]
    }
    
    getReadableString() {
        return qsTr("New %1 %2 created.").arg(Objects.types[this.targetType].displayType()).arg(this.targetName)
    }
}

class DeleteObject extends CreateNewObject {
    // Action used at the deletion of an object. Basicly the same thing as creating a new object, except Redo & Undo are reversed.
    type(){return 'DeleteObject'}
    
    undo() {
        super.redo()
    }
    
    redo() {
        super.undo()
    }
    
    getReadableString() {
        return qsTr("%1 %2 deleted.").arg(Objects.types[this.targetType].displayType()).arg(this.targetName)
    }
}

class EditedProperty extends Action {
    // Action used everytime an object's property has been changed
    type(){return 'EditedProperty'}
    
    constructor(targetName = "", targetType = "Point", targetProperty = "visible", previousValue = false, newValue = true, valueIsExpressionNeedingImport = false) {
        super(targetName, targetType)
        this.targetProperty = targetProperty
        this.targetPropertyReadable = Utils.camelCase2readable(this.targetProperty)
        this.previousValue = previousValue
        this.newValue = newValue
        if(valueIsExpressionNeedingImport) {
            if(targetType == "Expression") {
                this.previousValue = new MathLib.Expression(this.previousValue);
                this.newValue = new MathLib.Expression(this.newValue);
            } else if(targetType == "Domain") {
                this.previousValue = MathLib.parseDomain(this.previousValue);
                this.newValue = MathLib.parseDomain(this.newValue);
            } else {
                // Objects
                this.previousValue = Objects.getObjectByName(this.previousValue);
                this.newValue = Objects.getObjectByName(this.newValue);
            }
        }
    }
    
    undo() {
        Objects.getObjectByName(this.targetName, this.targetType)[this.targetProperty] = this.previousValue
    }
    
    redo() {
        Objects.getObjectByName(this.targetName, this.targetType)[this.targetProperty] = this.newValue
    }
    
    export() {
        if(this.previousValue instanceof MathLib.Expression) {
            return [this.targetName, this.targetType, this.targetProperty, this.previousValue.toEditableString(), this.newValue.toEditableString(), true]
        } else if(this.previousValue instanceof Common.DrawableObject) {
            return [this.targetName, this.targetType, this.targetProperty, this.previousValue.name, this.newValue.name, true]
            
        } else {
            return [this.targetName, this.targetType, this.targetProperty, this.previousValue, this.newValue, false]
        }
    }
    
    getReadableString() {
        var prev = this.previousValue == null ? ""+this.previousValue : this.previousValue.toString()
        var next = this.newValue == null ? ""+this.newValue : this.newValue.toString()
        return qsTr('%1 of %2 %3 changed from "%4" to "%5".').arg(this.targetPropertyReadable).arg(Objects.types[this.targetType].displayType()).arg(this.targetName).arg(prev).arg(next)
    }
}

class EditedVisibility extends EditedProperty {
    // Action used everytime an object's property has been changed
    type(){return 'EditedVisibility'}
    
    constructor(targetName = "", targetType = "Point", newValue = true) {
        super(targetName, targetType, "visible", !newValue, newValue)
    }
    
    getReadableString() {
        if(this.newValue) {
            return qsTr('%1 %2 shown.').arg(this.targetType).arg(this.targetName)
        } else {
            return qsTr('%1 %2 hidden.').arg(this.targetType).arg(this.targetName)
        }
    }
}

class NameChanged extends EditedProperty {
    // Action used everytime an object's property has been changed
    type(){return 'EditedVisibility'}
    
    constructor(targetName = "", targetType = "Point", newName = "") {
        super(targetName, targetType, "name", targetName, newName)
    }
    
    undo() {
        Objects.getObjectByName(this.newValue, this.targetType)['name'] = this.previousValue
    }
    
    redo() {
        Objects.getObjectByName(this.previousValue, this.targetType)[this.targetProperty] = this.newValue
    }
}

var Actions = {
    "Action": Action,
    "CreateNewObject": CreateNewObject,
    "DeleteObject": DeleteObject,
    "EditedProperty": EditedProperty,
    "EditedVisibility": EditedVisibility,
}