//! Challenge

/**
 * You've just finished writing the last chapter for your novel when a virus suddenly
 * infects your document. It has swapped the i's and e's in ei words and capitalized 
 * random letters. In today's challenge, you will write a function which will:
 * a) Remove the spelling errors in 'ei' words. (Examples of 'ei' words: their, caffein, deceive, weight)
 * b) Only capitalize the first letter of each sentence. 
 *  Make sure the rest of the sentence is in lowercase

 ** Example:
 * 'he haD iEght ShOTs of cAffIene.' ==> 'He had eight shots of caffeine.'
 
 * Good luck and happy coding~!
 */

 // Long Version
 function reformat_sentence(sentence) {
     // Capitalize first letter of string
     const capitalize_first_letter = (word) => word.replace(/^\w/, firstLetter => firstLetter.toUpperCase());

     // convert sentence to array of words, 
     // switch 'ie' to 'ei' in each word,
     // convert each word lowercase
     sentence = sentence.split(' ').map(word => {
         word = word.toLowerCase();
         return word.replace('ie', 'ei')
     })

     // Capitalize the first letter of the first word in the sentence array
     sentence[0] = capitalize_first_letter(sentence[0]);

     // Convert sentence back to string and return
     return sentence.join(' ');
 }


 // Short Version
 const reformatSentence = sentence => sentence
                                        .split(' ')
                                        .map(word => word.toLowerCase().replace('ie', 'ei'))
                                        .join(' ')
                                        .replace(/^\w/, firstLetter => firstLetter.toUpperCase());

console.log("Long Version:", reformat_sentence('he haD iEght ShOTs of cAffIene.'))
console.log("Short Version:", reformatSentence('he haD iEght ShOTs of cAffIene.'))

// Output
// Long Version: He had eight shots of caffeine.
// Short Version: He had eight shots of caffeine.