#pragma once

#include "enginedata.h"
#include "query.h"
#include <vector>
#include <unordered_map>
#include <map>

struct Script;
struct Query;


enum ExprNodeType {
	EFN_ADD=0, EFN_SUBTRACT, EFN_MULTIPLY, EFN_DIVIDE, EFN_MODULO,
	EFN_EQUAL, EFN_UNEQUAL,
	EFN_LESS, EFN_GREATER, EFN_LESSEQUAL, EFN_GREATEREQUAL,
	EFN_AND, EFN_OR,
	EFN_NOT, //1 arg
	EFN_MAX, EFN_MIN,

	EFN_NUMBER, EFN_VARIABLE, //0 arg
	EFN_INVALID //invalid
};

bool validateExprNodeType(ExprNodeType);

struct Expression {
	ExprNodeType type;
	vector<Expression> args;
	int intval;
	string varname;
	int evaluate(unordered_map<string,QueryResult>&);
};


enum ScriptLineType {
	SLT_QUERYSTUB,
	SLT_IF,
	SLT_WHILE,
	SLT_ASSIGNMENT
};

struct ScriptLine {
	ScriptLineType type;
	string *querystub=NULL;
	string *destvar=NULL;
	Expression *expr=NULL;
	Script *block=NULL;

	~ScriptLine(void);
	vector<QueryResult> execute(map<string,Table>&,unordered_map<string,QueryResult>&);
};

struct Script {
	vector<ScriptLine> lines;

	vector<QueryResult> execute(map<string,Table>&);
	vector<QueryResult> execute(map<string,Table>&,unordered_map<string,QueryResult>&);
};

//just hands over pointer, CALLING FUNCTION TAKES OWNERSHIP
Query* resolveQueryStub(const string &stub,map<string,Table>&,unordered_map<string,QueryResult>&);