using Console.Waterworks.Core.Assistants;
using Console.Waterworks.Core.Models;
using System;
using System.Collections.Generic;
using System.Linq;
using System.Reflection;

namespace Console.Waterworks.Core.Specialists
{
    class CommandsSpecialist
    {
        CommandsAssistant _assistant = new CommandsAssistant();

        internal List<Type> GetCommandClasses(string commandsNameSpace)
        {
            string theNamespace = commandsNameSpace;
            var q = from t in Assembly.GetEntryAssembly().GetTypes()
                    where t.GetTypeInfo().IsClass && t.Namespace == theNamespace
                    select t;
            return q.ToList();
        }

        internal Dictionary<string, Dictionary<string, IEnumerable<ParameterInfo>>> GetCommandLibraries(List<Type> commandClasses)
        {
            var commandLibraries = new Dictionary<string, Dictionary<string, IEnumerable<ParameterInfo>>>();
            foreach (var commandClass in commandClasses)
            {
                var methods = commandClass.GetMethods(BindingFlags.Static | BindingFlags.Public);
                var methodDictionary = new Dictionary<string, IEnumerable<ParameterInfo>>();
                foreach (var method in methods)
                {
                    string commandName = method.Name;
                    methodDictionary.Add(commandName, method.GetParameters());
                }
                commandLibraries.Add(commandClass.Name, methodDictionary);
            }
            return commandLibraries;
        }

        internal string ExecuteCommand(string commandsNamespace, Command command, List<Type> commandClasses, Dictionary<string, Dictionary<string, IEnumerable<ParameterInfo>>> commandLibraries, ConsoleIOSpecialist consoleSpec)
        {
            var classValidated = _assistant.ValidateClass(command, commandLibraries);
            var commandNameValidated = _assistant.ValidateCommand(command, commandLibraries);
            Dictionary<string, IEnumerable<ParameterInfo>> methodDictionary;
            if (classValidated != true || commandNameValidated != true)
                return _assistant.ExecuteBadCommandProcedure(command, consoleSpec);
            else
                methodDictionary = commandLibraries[command.ClassName];
            var paramInfoList = methodDictionary[command.Name].ToList();
            var paramsValidated = _assistant.ValidateParamArguments(command, paramInfoList);
            if (paramsValidated == false)
                return _assistant.ExecuteMissingArgumentProcedure(command, paramInfoList, consoleSpec);
            var methodParametreValueList = _assistant.GetParametreValueList(command, paramInfoList);
            var typeInfo = _assistant.BuildCommandLibraryClass(command, commandsNamespace);
            var inputArguments = _assistant.GetInputArguments(methodParametreValueList);
            var result = _assistant.InvokeCommand(command, typeInfo, inputArguments);
            return result;
        }
    }
}