import {
	log,
	// Log4Deno deps
	LT,
} from '../../deps.ts';

import config from '../../config.ts';

import { RollModifiers } from '../mod.d.ts';
import { ReturnData, SolvedRoll, SolvedStep } from './solver.d.ts';
import { compareTotalRolls, escapeCharacters } from './rollUtils.ts';
import { formatRoll } from './rollFormatter.ts';
import { fullSolver } from './solver.ts';

// parseRoll(fullCmd, modifiers)
// parseRoll handles converting fullCmd into a computer readable format for processing, and finally executes the solving
export const parseRoll = (fullCmd: string, modifiers: RollModifiers): SolvedRoll => {
	const returnmsg = {
		error: false,
		errorMsg: '',
		errorCode: '',
		line1: '',
		line2: '',
		line3: '',
	};

	// Whole function lives in a try-catch to allow safe throwing of errors on purpose
	try {
		// Split the fullCmd by the command prefix to allow every roll/math op to be handled individually
		const sepRolls = fullCmd.split(config.prefix);

		const tempReturnData: ReturnData[] = [];

		// Loop thru all roll/math ops
		for (let i = 0; i < sepRolls.length; i++) {
			log(LT.LOG, `Parsing roll ${fullCmd} | Working ${sepRolls[i]}`);
			// Split the current iteration on the command postfix to separate the operation to be parsed and the text formatting after the opertaion
			const [tempConf, tempFormat] = sepRolls[i].split(config.postfix);

			// Remove all spaces from the operation config and split it by any operator (keeping the operator in mathConf for fullSolver to do math on)
			const mathConf: (string | number | SolvedStep)[] = <(string | number | SolvedStep)[]> tempConf.replace(/ /g, '').split(/([-+()*/%^])/g);

			// Verify there are equal numbers of opening and closing parenthesis by adding 1 for opening parens and subtracting 1 for closing parens
			let parenCnt = 0;
			mathConf.forEach((e) => {
				log(LT.LOG, `Parsing roll ${fullCmd} | Checking parenthesis balance ${e}`);
				if (e === '(') {
					parenCnt++;
				} else if (e === ')') {
					parenCnt--;
				}
			});

			// If the parenCnt is not 0, then we do not have balanced parens and need to error out now
			if (parenCnt !== 0) {
				throw new Error('UnbalancedParens');
			}

			// Evaluate all rolls into stepSolve format and all numbers into floats
			for (let i = 0; i < mathConf.length; i++) {
				log(LT.LOG, `Parsing roll ${fullCmd} | Evaluating rolls into mathable items ${JSON.stringify(mathConf[i])}`);
				if (mathConf[i].toString().length === 0) {
					// If its an empty string, get it out of here
					mathConf.splice(i, 1);
					i--;
				} else if (mathConf[i] == parseFloat(mathConf[i].toString())) {
					// If its a number, parse the number out
					mathConf[i] = parseFloat(mathConf[i].toString());
				} else if (/([0123456789])/g.test(mathConf[i].toString())) {
					// If there is a number somewhere in mathconf[i] but there are also other characters preventing it from parsing correctly as a number, it should be a dice roll, parse it as such (if it for some reason is not a dice roll, formatRoll/roll will handle it)
					mathConf[i] = formatRoll(mathConf[i].toString(), modifiers.maxRoll, modifiers.nominalRoll);
				} else if (mathConf[i].toString().toLowerCase() === 'e') {
					// If the operand is the constant e, create a SolvedStep for it
					mathConf[i] = {
						total: Math.E,
						details: '*e*',
						containsCrit: false,
						containsFail: false,
					};
				} else if (mathConf[i].toString().toLowerCase() === 'pi' || mathConf[i].toString().toLowerCase() == '𝜋') {
					// If the operand is the constant pi, create a SolvedStep for it
					mathConf[i] = {
						total: Math.PI,
						details: '𝜋',
						containsCrit: false,
						containsFail: false,
					};
				} else if (mathConf[i].toString().toLowerCase() === 'pie') {
					// If the operand is pie, pi*e, create a SolvedStep for e and pi (and the multiplication symbol between them)
					mathConf[i] = {
						total: Math.PI,
						details: '𝜋',
						containsCrit: false,
						containsFail: false,
					};
					mathConf.splice(i + 1, 0, ...['*', {
						total: Math.E,
						details: '*e*',
						containsCrit: false,
						containsFail: false,
					}]);
				}
			}

			// Now that mathConf is parsed, send it into the solver
			const tempSolved = fullSolver(mathConf, false);

			// Push all of this step's solved data into the temp array
			tempReturnData.push({
				rollTotal: tempSolved.total,
				rollPostFormat: tempFormat,
				rollDetails: tempSolved.details,
				containsCrit: tempSolved.containsCrit,
				containsFail: tempSolved.containsFail,
				initConfig: tempConf,
			});
		}

		// Parsing/Solving done, time to format the output for Discord

		// Remove any floating spaces from fullCmd
		if (fullCmd[fullCmd.length - 1] === ' ') {
			fullCmd = fullCmd.substring(0, fullCmd.length - 1);
		}

		// Escape any | and ` chars in fullCmd to prevent spoilers and code blocks from acting up
		fullCmd = escapeCharacters(fullCmd, '|');
		fullCmd = fullCmd.replace(/`/g, '');

		let line1 = '';
		let line2 = '';
		let line3 = '';

		// If maximiseRoll or nominalRoll are on, mark the output as such, else use default formatting
		if (modifiers.maxRoll) {
			line1 = ` requested the theoretical maximum of: \`${config.prefix}${fullCmd}\``;
			line2 = 'Theoretical Maximum Results: ';
		} else if (modifiers.nominalRoll) {
			line1 = ` requested the theoretical nominal of: \`${config.prefix}${fullCmd}\``;
			line2 = 'Theoretical Nominal Results: ';
		} else if (modifiers.order === 'a') {
			line1 = ` requested the following rolls to be ordered from least to greatest: \`${config.prefix}${fullCmd}\``;
			line2 = 'Results: ';
			tempReturnData.sort(compareTotalRolls);
		} else if (modifiers.order === 'd') {
			line1 = ` requested the following rolls to be ordered from greatest to least: \`${config.prefix}${fullCmd}\``;
			line2 = 'Results: ';
			tempReturnData.sort(compareTotalRolls);
			tempReturnData.reverse();
		} else {
			line1 = ` rolled: \`${config.prefix}${fullCmd}\``;
			line2 = 'Results: ';
		}

		// Fill out all of the details and results now
		tempReturnData.forEach((e) => {
			log(LT.LOG, `Parsing roll ${fullCmd} | Making return text ${JSON.stringify(e)}`);
			let preFormat = '';
			let postFormat = '';

			// If the roll containted a crit success or fail, set the formatting around it
			if (e.containsCrit) {
				preFormat = `**${preFormat}`;
				postFormat = `${postFormat}**`;
			}
			if (e.containsFail) {
				preFormat = `__${preFormat}`;
				postFormat = `${postFormat}__`;
			}

			// Populate line2 (the results) and line3 (the details) with their data
			if (modifiers.order === '') {
				line2 += `${preFormat}${e.rollTotal}${postFormat}${escapeCharacters(e.rollPostFormat, '|*_~`')}`;
			} else {
				// If order is on, turn rolls into csv without formatting
				line2 += `${preFormat}${e.rollTotal}${postFormat}, `;
			}

			line2 = line2.replace(/\*\*\*\*/g, '** **').replace(/____/g, '__ __').replace(/~~~~/g, '~~ ~~');

			line3 += `\`${e.initConfig}\` = ${e.rollDetails} = ${preFormat}${e.rollTotal}${postFormat}\n`;
		});

		// If order is on, remove trailing ", "
		if (modifiers.order !== '') {
			line2 = line2.substring(0, line2.length - 2);
		}

		// Fill in the return block
		returnmsg.line1 = line1;
		returnmsg.line2 = line2;
		returnmsg.line3 = line3;
	} catch (solverError) {
		// Welp, the unthinkable happened, we hit an error

		// Split on _ for the error messages that have more info than just their name
		const [errorName, errorDetails] = solverError.message.split('_');

		let errorMsg = '';

		// Translate the errorName to a specific errorMsg
		switch (errorName) {
			case 'YouNeedAD':
				errorMsg = 'Formatting Error: Missing die size and count config';
				break;
			case 'FormattingError':
				errorMsg = 'Formatting Error: Cannot use Keep and Drop at the same time, remove all but one and repeat roll';
				break;
			case 'NoMaxWithDash':
				errorMsg = 'Formatting Error: CritScore range specified without a maximum, remove - or add maximum to correct';
				break;
			case 'UnknownOperation':
				errorMsg = `Error: Unknown Operation ${errorDetails}`;
				if (errorDetails === '-') {
					errorMsg += '\nNote: Negative numbers are not supported';
				} else if (errorDetails === ' ') {
					errorMsg += `\nNote: Every roll must be closed by ${config.postfix}`;
				}
				break;
			case 'NoZerosAllowed':
				errorMsg = 'Formatting Error: ';
				switch (errorDetails) {
					case 'base':
						errorMsg += 'Die Size and Die Count';
						break;
					case 'drop':
						errorMsg += 'Drop (d or dl)';
						break;
					case 'keep':
						errorMsg += 'Keep (k or kh)';
						break;
					case 'dropHigh':
						errorMsg += 'Drop Highest (dh)';
						break;
					case 'keepLow':
						errorMsg += 'Keep Lowest (kl)';
						break;
					case 'reroll':
						errorMsg += 'Reroll (r)';
						break;
					case 'critScore':
						errorMsg += 'Crit Score (cs)';
						break;
					default:
						errorMsg += `Unhandled - ${errorDetails}`;
						break;
				}
				errorMsg += ' cannot be zero';
				break;
			case 'CritScoreMinGtrMax':
				errorMsg = 'Formatting Error: CritScore maximum cannot be greater than minimum, check formatting and flip min/max';
				break;
			case 'MaxLoopsExceeded':
				errorMsg = 'Error: Roll is too complex or reaches infinity';
				break;
			case 'UnbalancedParens':
				errorMsg = 'Formatting Error: At least one of the equations contains unbalanced parenthesis';
				break;
			case 'EMDASNotNumber':
				errorMsg = 'Error: One or more operands is not a number';
				break;
			case 'ConfWhat':
				errorMsg = 'Error: Not all values got processed, please report the command used';
				break;
			case 'OperatorWhat':
				errorMsg = 'Error: Something really broke with the Operator, try again';
				break;
			case 'OperandNaN':
				errorMsg = 'Error: One or more operands reached NaN, check input';
				break;
			case 'UndefinedStep':
				errorMsg = 'Error: Roll became undefined, one or more operands are not a roll or a number, check input';
				break;
			default:
				log(LT.ERROR, `Undangled Error: ${errorName}, ${errorDetails}`);
				errorMsg = `Unhandled Error: ${solverError.message}\nCheck input and try again, if issue persists, please use \`${config.prefix}report\` to alert the devs of the issue`;
				break;
		}

		// Fill in the return block
		returnmsg.error = true;
		returnmsg.errorCode = solverError.message;
		returnmsg.errorMsg = errorMsg;
	}

	return returnmsg;
};