#include <string>       // std::string
#include <iostream>     // std::cout
#include <sstream>      // std::stringstream
#include <vector>
#include <string>
#include "Parserv3.h"

using namespace std;

vector<string> tokenize(string ss)
{
	string tempString;
	stringstream lineStream(ss);
	vector<string> output;
	
	while (lineStream >> tempString)
	{
		output.push_back(tempString);
	}
	
	//testing---------------
	cout<<"TokenList: ";
	
	for (int i = 0; i <output.size(); ++i)
	{
		cout<<output[i]<<"  ";
	}
	//----------------------
	
	return output;
}

void displayTokenList(vector<string> input)
{
	cout<<"TokenList: "<<endl;
	for (int i = 0; i < input.size(); ++i)
	{
		cout<<input[i]<<endl;
	}
}

vector<string> showCMD(vector<string> input)
{
	if (input.size() > 3)
	{
		cout<<"Syntax error!"<<endl;
	}
	
	cout<<"\nPassing the following arguments to dbEngine: "<<endl;
	cout<<"command :"<<input[0]<<endl;
	cout<<"argument: "<<input[1]<<endl;	
	
	return input;
}

vector<string> saveCMD(vector<string> input)
{
	if (input.size() > 3)
	{
		cout<<"Syntax error!"<<endl;
	}
				
	cout<<"\nPassing the following arguments to dbEngine: "<<endl;
	cout<<"command :"<<input[0]<<endl;
	cout<<"argument: "<<input[1]<<endl;	
	
	return input;
}

vector<string> closeCMD(vector<string> input)
{
	if (input.size() > 3)
	{
		cout<<"Syntax error!"<<endl;
	}
				
	cout<<"\nPassing the following arguments to dbEngine: "<<endl;
	cout<<"command :"<<input[0]<<endl;
	cout<<"argument: "<<input[1]<<endl;	
	
	return input;
}

vector<string> openCMD(vector<string> input)
{
	if (input.size() > 3)
	{
		cout<<"Syntax error!"<<endl;
	}
				
	cout<<"\nPassing the following arguments to dbEngine: "<<endl;
	cout<<"command :"<<input[0]<<endl;
	cout<<"argument: "<<input[1]<<endl;	
	
	return input;
}

vector<string> exitCMD(vector<string> input)
{
	if (input[1] != ";")
	{
		cout<<"ERROR: missing semicolon!"<<endl;
	}
	
	if (input[0] != "EXIT") { cout<<"Wrong function/syntax error!"<<endl;}
	cout<<"Passing command: "<<input[0]<<endl;
	
	return input;
}


vector<string> createCMD(vector<string> input)
{
	//relation name will be the first element of the vector of data returned by this function
	
	if (input[0] == "CREATE" && input[1] == "TABLE")
	{
		input.erase(input.begin());
		input.erase(input.begin());
		
		Relation r;
		r.setRelation(input[0]);
		
		input.erase(input.begin());
		
		if(input[0] == "(")
		{			
			input.erase(input.begin());
			
			vector <Expression> e1;
			
			while(input[0] != ")")	//inserting all values to relation
			{
				if (input[0] == ",")
				{
					input.erase(input.begin());
				}
				
				e1.push_back(input[0]);
				
				input.erase(input.begin());
			}
			
			vector <Expression> e2;
			
			if(input[0] == "PRIMARY" && input[1] == "KEY")
			{
				input.erase(input.begin());
				input.erase(input.begin());
				
				if(input[0] == "(")
				{
				
					while(input[0] != ")")	//inserting all values to relation
					{
						if (input[0] == ",")
						{
							input.erase(input.begin());
						}
						
						e2.push_back(input[0]);
						
						input.erase(input.begin());
					}
					
					cout << "Creating a table: " << r.getName() << "\n";
					cout << "Primary key: ";
					while(!e2.empty())
					{
						cout << e2[0].getExpression() << " ";
						e2.erase(e2.begin());
					}
				
					return input;
				}
			}
		}
			
		else cout<<"Syntax error!"<<endl;
	}
	else cout<<"Syntax error!"<<endl;
	
}

vector<string> insertCMD(vector<string> input)
{
	//relation name will be the first element of the vector of data returned by this function
		
	if (input[0] == "INTO")
	{
		input.erase(input.begin());
		
		Relation r(input[0]);
		
		input.erase(input.begin());
		
		if (input[0] == "VALUES" && input[1] == "FROM")
		{
			input.erase(input.begin());
			input.erase(input.begin());
			
			
			if(input[0] == "(")
			{
				vector <Expression> e;
				input.erase(input.begin());
				
				while(input[0] != ")")	//inserting all values to relation
				//for (int i = 0; i < 2; ++i)
				{
					if (input[0] == ",") input.erase(input.begin());
					
					e.push_back(input[0]);
					
					input.erase(input.begin());
				}
				
				cout << "Inserting: ";
				while(!e.empty())
				{
					cout << e[0].getExpression() << " ";
					e.erase(e.begin());
				}
				cout << "into " << r.getName() << ".\n";
				
				return input;
				
			}
			
			else if (input[0] == "RELATION")
			{
				input.erase(input.begin());
				
				Expression e;
				
				while(input[0] != ";")
				{
					e.setExpression(e.getExpression() + input[0]);
				}
				
				cout << "Inserting: " << e.getExpression() << " into " << r.getName() << ".\n";
				
				return input;
			}
			
			else cout<<"Syntax error!"<<endl;
		}
		
		cout<<"Syntax error!"<<endl;
		
	}
	
	else cout<<"Syntax error!"<<endl;
	
}

vector<string> updateCMD(vector<string> input)
{
	//parse Relation r
	
	//parse out SET
	if(input[0] == "SET")
	{
		input.erase(input.begin());
		
		Relation r(input[0]);
		
		input.erase(input.begin());
		
		//parse out ( and send everything until ) into an Expression vector
		if(input[0] == "(")
		{
			
			vector <Expression> e;
			input.erase(input.begin());
			
			while(input[0] != ")")
			{
				e.push_back(input[0]);
			}
		}
		
		if(input[0] == "WHERE")
		{
			Condition c;
			while(input[0] != ";")
			{
				c.setCondition(/*c.getCondition +*/ input[0]);
			}
		}
	}
	
	else cout<<"Syntax error!"<<endl;
}

vector<string> deleteCMD(vector<string> input)
{
	// parse out DELETE FROM
	if (input[0] == "DELETE" && input[1] == "FROM")
	{
		input.erase(input.begin());
		input.erase(input.begin());
		
		Relation r(input[0]);
		if(input[0] == "(")
		{
			vector <Expression> e;
			input.erase(input.begin());
			
			while(input[0] != ")")	
			{
				if (input[0] == ",") input.erase(input.begin());
				
				e.push_back(input[0]);
				
				input.erase(input.begin());
			}
			
			cout << "Deleting: ";
			while(!e.empty())
			{
				cout << e[0].getExpression() << " ";
				e.erase(e.begin());
			}
			cout << "from " << r.getName() << ".\n";
			
			return input;
			
		}
		else cout<<"Syntax error!"<<endl;
	}
	//parser relation name into Relation r
	
	//parse out WHERE
	
	//parse condition into Condition c
	
	//cout "Deleting [c] from [r]"
	
	//return input
}

void par_line(vector<string> input)	//calls par_command() or par_query() depending on first item from token list
{
/*
• Match the first item in the token list and determine weather this is a command or a query.
• Call functions par_command() or par_query();
• After either par_command() or par_query() returns, make sure the line ends properly with “;” token
*/
	string tempChar = input.back();
	
	if (tempChar != ";")
	{
		cout<<"ERROR! missing semicolon "<<endl;
	}
	
	else
	{
		//command
		// if ( input[0] == "open-cmd" || input[0] == "close-cmd" || 
			 // input[0] == "save-cmd" || input[0] == "exit-cmd" || 
			 // input[0] == "show-cmd" || input[0] == "create-cmd" || 
			 // input[0] == "update-cmd" || input[0] == "insert-cmd" || 
			 // input[0] == "delete-cmd" ) 
			// {
				// par_command(input[0]);
			// }

		//query
		// if ( input[0] == "select" || input[0] == "project" || 
			 // input[0] == "product" || input[0] == "difference" || 
			 // input[0] == "union" || input[0] == "renaming" || 
			 // input[0] == "update-cmd" || input[0] == "insert-cmd" || 
			 // input[0] == "delete-cmd" ) 
			// {
				// par_query(input[0]);
			// }
	
			if ( input[0] == "INSERT")
			{
				cout<<"\nPassing the following arguments to dbEngine: \nCommand: "<<input[0]<<endl;
				input.erase(input.begin());
				vector<string> insertInput = insertCMD(input);
				cout<<"arguments: "<<endl;
				displayTokenList(insertInput);
				
			}
			
			if ( input[0] == "CREATE")
			{
				cout<<"\nPassing the following arguments to dbEngine: \nCommand: "<<input[0]<<endl;
				input.erase(input.begin());
				input.erase(input.begin());
				
				vector<string> insertInput = insertCMD(input);
				cout<<"arguments: "<<endl;
				displayTokenList(insertInput);
				
			}
				
			if ( input[0] == "SHOW")
			{
				showCMD(input);			
			}
			
			if ( input[0] == "EXIT")
			{
				exitCMD(input);			
			}
	}
}

int main () {

	
	string ss = "INSERT INTO animals VALUES FROM  ( Joe , cat , 4 ) ;";
	string ss2 = "SHOW Dogs ;";
	string ss3 = "EXIT ; ";
	
	vector<string> listOfTokens = tokenize(ss);
	vector<string> listOfTokens2 = tokenize(ss2);
	vector<string> listOfTokens3 = tokenize(ss3);
	
	par_line(listOfTokens);
	par_line(listOfTokens2);
	par_line(listOfTokens3);
	
		
}