// Game logic for morse code practice

import { textToMorse, compareMorse, normalizeMorse } from "./morse.ts";

export type GameMode = 'letters' | 'numbers' | 'words' | 'phrases';

export interface GameConfig {
  mode: GameMode;
  rounds: number;
  timePerRound: number; // seconds
}

export interface RoundResult {
  challenge: string;
  expectedMorse: string;
  userInput: string;
  correct: boolean;
  timeSpent: number; // milliseconds
}

export interface GameSession {
  config: GameConfig;
  currentRound: number;
  results: RoundResult[];
  currentStreak: number;
  bestStreak: number;
}

// Word banks for different difficulty levels
const LETTERS = 'ABCDEFGHIJKLMNOPQRSTUVWXYZ'.split('');
const NUMBERS = '0123456789'.split('');
const WORDS = [
  'HELLO', 'WORLD', 'CODE', 'TIME', 'GAME', 'TEST', 'PLAY',
  'FAST', 'SLOW', 'HELP', 'GOOD', 'BEST', 'NICE', 'COOL',
  'MORSE', 'SIGNAL', 'RADIO', 'SEND', 'MESSAGE', 'QUICK',
  'LEARN', 'PRACTICE', 'SKILL', 'MASTER', 'EXPERT',
];
const PHRASES = [
  'HELLO WORLD',
  'GOOD MORNING',
  'HOW ARE YOU',
  'THANK YOU',
  'SEE YOU SOON',
  'HAVE A NICE DAY',
  'MORSE CODE',
  'QUICK BROWN FOX',
  'THE END',
  'WELL DONE',
];

/**
 * Get a random challenge based on game mode
 */
export function getChallenge(mode: GameMode): string {
  switch (mode) {
    case 'letters':
      return LETTERS[Math.floor(Math.random() * LETTERS.length)];
    case 'numbers':
      return NUMBERS[Math.floor(Math.random() * NUMBERS.length)];
    case 'words':
      return WORDS[Math.floor(Math.random() * WORDS.length)];
    case 'phrases':
      return PHRASES[Math.floor(Math.random() * PHRASES.length)];
  }
}

/**
 * Create a new game session
 */
export function createGameSession(config: GameConfig): GameSession {
  return {
    config,
    currentRound: 0,
    results: [],
    currentStreak: 0,
    bestStreak: 0,
  };
}

/**
 * Process a round result
 */
export function processRound(
  session: GameSession,
  challenge: string,
  userInput: string,
  timeSpent: number
): RoundResult {
  const expectedMorse = textToMorse(challenge);
  const normalizedInput = normalizeMorse(userInput);
  const correct = compareMorse(expectedMorse, normalizedInput);

  const result: RoundResult = {
    challenge,
    expectedMorse,
    userInput: normalizedInput,
    correct,
    timeSpent,
  };

  session.results.push(result);
  session.currentRound++;

  // Update streak
  if (correct) {
    session.currentStreak++;
    session.bestStreak = Math.max(session.bestStreak, session.currentStreak);
  } else {
    session.currentStreak = 0;
  }

  return result;
}

/**
 * Check if game is complete
 */
export function isGameComplete(session: GameSession): boolean {
  return session.currentRound >= session.config.rounds;
}

/**
 * Get game summary statistics
 */
export function getGameSummary(session: GameSession) {
  const totalRounds = session.results.length;
  const correct = session.results.filter(r => r.correct).length;
  const incorrect = totalRounds - correct;
  const accuracy = totalRounds > 0 ? (correct / totalRounds) * 100 : 0;
  const averageTime = totalRounds > 0
    ? session.results.reduce((sum, r) => sum + r.timeSpent, 0) / totalRounds
    : 0;

  return {
    totalRounds,
    correct,
    incorrect,
    accuracy,
    averageTime,
    streak: session.bestStreak,
  };
}

/**
 * Get difficulty description for a mode
 */
export function getDifficultyDescription(mode: GameMode): string {
  switch (mode) {
    case 'letters':
      return 'Single letters A-Z';
    case 'numbers':
      return 'Single digits 0-9';
    case 'words':
      return 'Common 4-6 letter words';
    case 'phrases':
      return 'Short phrases';
  }
}