ACTIONVAR_USER = 1
ACTIONVAR_OBJ1 = 2
ACTIONVAR_OBJ2 = 3
ACTIONBAR_TEMP = 4
ACTIONVAR_USERPOS = 5
ACTIONVAR_OBJ1POS = 6
ACTIONVAR_OBJ2POS = 7
ACTIONVAR_OBJ2TYPE = 8
ACTIONVAR_OBJ1ID = 9

ActionSystem = {
    actionsId = {
        [ACTIONVAR_OBJ1] = {},
    },
    actionsAId = {
        [ACTIONVAR_OBJ1] = {},
    },
    actionsUid = {
        [ACTIONVAR_OBJ1] = {},
    },
    b = 100,
}

function ActionSystem:executeConditions(conditionList, vars, fromPosition, isHotkey)
    if #conditionList == 0 then
        return true
    end

    for _, func in ipairs(conditionList) do
        if not func(vars, fromPosition, isHotkey) then
            return false
        end
    end

    return true
end

function ActionSystem:executeActions(actionList, vars, fromPosition, isHotkey)
    for _, func in ipairs(actionList) do
        if not func(vars, fromPosition, isHotkey) then
            return false
        end
    end

    return true
end

function ActionSystem:doActionList(list, vars, fromPosition, isHotkey)
    for _, data in ipairs(list) do
        if self:executeConditions(data.conditions, vars, fromPosition, isHotkey) then
            if self:executeActions(data.actions, vars, fromPosition, isHotkey) then
                return true
            end
        end
    end

    return false
end

function ActionSystem:getActions(whichObjectId, list, id)
    return list[whichObjectId][id]
end

function ActionSystem:onUseEventCallback(player, item, playerPosition, itemPosition, fromPosition, target, toPosition, isHotkey)
    local vars = {
        [ACTIONVAR_USER] = player,
        [ACTIONVAR_OBJ1] = item,
        [ACTIONVAR_OBJ1POS] = itemPosition,
    }

    local itemId = item:getId()
    local actionId = item:getActionId()
    local uniqueId = item:getAttribute(ITEM_ATTRIBUTE_UNIQUEID)

    vars[ACTIONVAR_OBJ1ID] = itemId

    if uniqueId > 0 then
        local list = self:getActions(ACTIONVAR_OBJ1, self.ActionsUid, uniqueId)
        if list then
            if self:doActionList(list, vars, fromPosition, isHotkey) then
                return true
            end
        end
    end

    if actionId > 0 then
        local list = self:getActions(ACTIONVAR_OBJ1, self.actionsAId, actionId)
        if list then
            if self:doActionList(list, vars, fromPosition, isHotkey) then
                return true
            end
        end
    end

    local list = self:getActions(ACTIONVAR_OBJ1, self.actionsId, itemId)
    if list then
        if self:doActionList(list, vars, fromPosition, isHotkey) then
            return true
        end
    end

    return false
end

function IsType(var, id)
    return function()
        return var, id
    end
end

function IsPosition(target, x, y, z)
    local p = Position(x, y, z)
    return function(vars, fromPosition, isHotkey)
        local posVar
        if target == ACTIONVAR_OBJ1 then
            posVar = ACTIONVAR_OBJ1POS
        end

        return (vars[ACTIONVAR_OBJ1POS] == p)
    end
end

function Effect(target, effect)
    return function(vars, fromPosition, isHotkey)
        vars[ACTIONVAR_OBJ1POS]:sendMagicEffect(effect)
        return true
    end
end


function Use(...)
    local parameters = {...}

    --first condition must be the function that defines item id/unique id/action id define
    local firstCondition = parameters[1]
    table.remove(parameters, 1)

    local var, choiceId = firstCondition()

    local foundActions = false

    local conditions = {}
    local actions = {}

    for _, param in ipairs(parameters) do
        if param == "->" then
            foundActions = true
        else
            if foundActions then
                table.insert(actions, param)
            else
                table.insert(conditions, param)
            end
        end
    end

    local data = {conditions = conditions, actions = actions}

    if not ActionSystem.actionsId[var][choiceId] then
        ActionSystem.actionsId[var][choiceId] = {}
    end

    table.insert(ActionSystem.actionsId[var][choiceId], data)
end