package structs

import (
	"fmt"
)

type Ciphertext struct {
	Text         string         // the CipherText
	FrequencyMap map[string]int // frequency map
	BiGrams      map[string]int // frequency map
	cipher       []string       // list of ciphers that were applied to get this payload
}

// RotAll rotates the given ciphertext for all possile rotations
func (CiphertextVar Ciphertext) DecodeRotN(mainChannel chan Ciphertext) {

	// Calculate the new ciphertext for all rotations and push the result into the channel
	for i := 0; i < 26; i++ {
		CiphertextVar.Rot(i, mainChannel)
	}
}

// Rot rotates a ciphertext n units in one direction
func (CiphertextVar Ciphertext) Rot(n int, mainChannel chan Ciphertext) {

	// Length of the given ciphertext
	var CiphertextLength int = len(CiphertextVar.Text)
	var RotatedText string

	// Iterate over all the chars in the ciphertext and shift them by i units circular
	for i := 0; i < CiphertextLength; i++ {

		// Handle uppercase characters
		if 65 < int(CiphertextVar.Text[i]) == true && (int(CiphertextVar.Text[i])) < 90 == true {
			var newChar = (((int(CiphertextVar.Text[i]) + n) - 65) % 26) + 65
			RotatedText += string(newChar)
		}

		// Handle lowercase characters
		if 97 < int(CiphertextVar.Text[i]) == true && (int(CiphertextVar.Text[i])) < 122 == true {
			var newChar = (((int(CiphertextVar.Text[i]) + n) - 97) % 26) + 97
			RotatedText += string(newChar)
		}
	}

	// Convert the RotatedText string into a Ciphertext struct
	RotatedCipherStruct := Ciphertext{
		Text:         RotatedText,
		FrequencyMap: nil,
		cipher:       nil,
	}

	// Push the RotatedCipherStruct back into the main channel
	mainChannel <- RotatedCipherStruct
}

func (PrintString Ciphertext) Println() {
	fmt.Println(PrintString)
}

func (CiphertextVar Ciphertext) GenFrequencyMap(mainChannel chan Ciphertext) {

	// Initialize a Map mapping runes (chars) to ins (the amount of occurrences)
	newFrequencyMap := make(map[string]int)

	// Iterate over all the characters in the CipherText generating a FrequencyMap
	CipherTextLength := len(CiphertextVar.Text)
	ciphertext := CiphertextVar.Text
	for i := 0; i < CipherTextLength; i++ {
		newFrequencyMap[string(rune(ciphertext[i]))] = newFrequencyMap[string(rune(ciphertext[i]))] + 1
	}

	// Generate an instance of the Ciphertext containing the new FrequencyMap
	newCipherText := Ciphertext{
		Text:         CiphertextVar.Text,
		FrequencyMap: newFrequencyMap,
		BiGrams:      nil,
		cipher:       nil,
	}

	// Push the newCipherText back into the mainChannel
	mainChannel <- newCipherText
}

func (CiphertextVar Ciphertext) GenBiGramMap(mainChannel chan Ciphertext) {
	newBiGramMap := make(map[string]int)

	// Iterate over all the characters in the CipherText generating a FrequencyMap
	CipherTextLength := len(CiphertextVar.Text)
	ciphertext := CiphertextVar.Text
	for i := 0; i < CipherTextLength-1; i++ {
		newBiGramMap[string(ciphertext[i:i+2])] = newBiGramMap[string(ciphertext[i:i+2])] + 1
	}

	// Generate an instance of the Ciphertext containing the new FrequencyMap
	newCipherText := Ciphertext{
		Text:         CiphertextVar.Text,
		FrequencyMap: CiphertextVar.FrequencyMap,
		BiGrams:      newBiGramMap,
		cipher:       nil,
	}

	// Push the newCipherText back into the mainChannel
	mainChannel <- newCipherText
}