//Fun/AdventCalendar2020/Day4-1.cpp
//Matthew Ellison
// Created: 12-04-20
//Modified: 12-04-20
//Validate passport data


#include <iostream>
#include <fstream>
#include <string>
#include <vector>
#include "Stopwatch.hpp"
#include "Algorithms.hpp"


struct passport{
	std::string birthYear;
	std::string issueYear;
	std::string expirationYear;
	std::string height;
	std::string hairColor;
	std::string eyeColor;
	std::string passportId;
	std::string countryId;
	//Returns true if the passport is valid
	bool isValid(){
		if(birthYearIsValid() && issueYearIsValid() && expirationYearIsValid() && heightIsValid() && hairColorIsValid() && eyeColorIsValid() && passportIdIsValid()){
			return true;
		}
		else{
			return false;
		}
	}
	//Returns true if the string is a valid string
	bool validString(std::string str){
		if(!str.empty()){
			return true;
		}
		else{
			return false;
		}
	}
	bool birthYearIsValid(){
		//There must be four digits
		if(birthYear.size() != 4){
			return false;
		}
		//That are all numbers
		for(char ch : birthYear){
			if(!std::isdigit(ch)){
				return false;
			}
		}
		//The number must be 1920 <= x <= 2002
		int num = std::stoi(birthYear);
		if((num < 1920) || (num > 2002)){
			return false;
		}

		//If none of the other conditions were hit return true;
		return true;
	}
	bool issueYearIsValid(){
		//There must be four digits
		if(issueYear.size() != 4){
			return false;
		}
		//That are all numbers
		for(char ch : issueYear){
			if(!std::isdigit(ch)){
				return false;
			}
		}
		//The number must be 2010 <= x <= 2020
		int num = std::stoi(issueYear);
		if((num < 2010) || (num > 2020)){
			return false;
		}

		//If none of the other conditions were hit return true;
		return true;
	}
	bool expirationYearIsValid(){
		//There must be four digits
		if(expirationYear.size() != 4){
			return false;
		}
		//That are all numbers
		for(char ch : expirationYear){
			if(!std::isdigit(ch)){
				return false;
			}
		}
		//The number must be 2020<= x <= 2030
		int num = std::stoi(expirationYear);
		if((num < 2020) || (num > 2030)){
			return false;
		}

		//If none of the other conditions were hit return true;
		return true;
	}
	bool heightIsValid(){
		//It must be a number followed by 2 characters (in or cm)
		//Split the string into digits and suffix
		std::string numStr;
		int num = 0;
		std::string suffix;
		int strLoc = 0;
		for(;strLoc < height.size();++strLoc){
			if(std::isdigit(height[strLoc])){
				numStr += height[strLoc];
			}
			else{
				break;
			}
		}
		if(numStr.size() == 0){
			return false;
		}
		num = std::stoi(numStr);
		for(;strLoc < height.size();++strLoc){
			if(std::isdigit(height[strLoc])){
				return false;
			}
			else{
				suffix += height[strLoc];
			}
		}

		//If suffix is in 59 <= x <= 76
		if(suffix == "in"){
			if((num < 59) || (num > 76)){
				return false;
			}
			else{
				return true;
			}
		}
		//If suffix is cm 150 <= x <= 193
		else if(suffix == "cm"){
			if((num < 150) || (num > 193)){
				return false;
			}
			else{
				return true;
			}
		}
		else{
			return false;
		}

		//If none of the other conditions were hit return true;
		return true;
	}
	bool hairColorIsValid(){
		//Contains 7 characters
		if(hairColor.size() != 7){
			return false;
		}
		//Start with #
		if(hairColor[0] != '#'){
			return false;
		}
		//Then 6 hex characters
		for(int cnt = 1;cnt < hairColor.size();++cnt){
			if(!std::isxdigit(hairColor[cnt])){
				return false;
			}
		}

		//If none of the other conditions were hit return true;
		return true;
	}
	bool eyeColorIsValid(){
		//amb or blu or brn or gry or grn or hzl or oth
		if(eyeColor == "amb"){
			return true;
		}
		else if(eyeColor == "blu"){
			return true;
		}
		else if(eyeColor == "brn"){
			return true;
		}
		else if(eyeColor == "gry"){
			return true;
		}
		else if(eyeColor == "grn"){
			return true;
		}
		else if(eyeColor == "hzl"){
			return true;
		}
		else if(eyeColor == "oth"){
			return true;
		}
		else{
			return false;
		}
	}
	bool passportIdIsValid(){
		//Must be a 9-digit number
		if(passportId.size() != 9){
			return false;
		}
		for(char ch : passportId){
			if(!std::isdigit(ch)){
				return false;
			}
		}

		//If none of the other conditions were hit return true;
		return true;
	}
};


std::vector<passport> importData(){
	std::vector<passport> passports;
	std::ifstream inputFile;
	inputFile.open("inputs/Day4.txt");	//Open the file that has the input for the question

	//Get the input one line at a time because a full blank line is the end of a passport
	while(!inputFile.eof()){
		passport currentPassport;
		std::string currentLine;
		std::getline(inputFile, currentLine);
		while(currentLine != ""){
			//Split the string on [space]
			for(std::string str : mee::split(currentLine, ' ')){
				//Split the string on :
				std::vector<std::string> fields = mee::split(str, ':');
				std::string field = fields[0];
				std::string value = fields[1];

				//Determine what field you are dealing with and save the data
				if(field == "byr"){
					currentPassport.birthYear = value;
				}
				else if(field == "iyr"){
					currentPassport.issueYear = value;
				}
				else if(field == "eyr"){
					currentPassport.expirationYear = value;
				}
				else if(field == "hgt"){
					currentPassport.height = value;
				}
				else if(field == "hcl"){
					currentPassport.hairColor = value;
				}
				else if(field == "ecl"){
					currentPassport.eyeColor = value;
				}
				else if(field == "pid"){
					currentPassport.passportId = value;
				}
				else if(field == "cid"){
					currentPassport.countryId = value;
				}
				else{
					std::cout << "ERROR!\n" << "field = " << field << "\tValue = " << value << std::endl;
					exit(1);
				}
			}
			std::getline(inputFile, currentLine);
		}
		passports.push_back(currentPassport);
	}

	return passports;
}

int main(){
	mee::Stopwatch timer;
	int validPassports = 0;

	//Start the timer
	timer.start();


	//Get the passport data
	std::vector<passport> passports = importData();

	//Count how many are valid
	for(passport pspt : passports){
		if(pspt.isValid()){
			++validPassports;
		}
	}


	//Stop the timer
	timer.stop();

	//Print the results
	std::cout << "There are " << validPassports << " valid passports"
			<< "\nIt took " << timer.getStr() << " to finish this problem" << std::endl;

	return 0;
}

/* Results:
There are 175 valid passports
It took 1.999 milliseconds to finish this problem
*/