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include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <ctype.h>

#define MAX_TEXT_LENGTH 1000

void viewText(const char* text)
{
    printf("Current Text: %s\n", text);
}

int main()
{
    char text[MAX_TEXT_LENGTH] = "";
    int cursorPosition = 0;
    char input[MAX_TEXT_LENGTH];

    while (1)
    {
        printf("Text: %s\n", text);
        printf("Cursor Position: %d\n", cursorPosition);
        printf("Enter command (I: Insert, D: Delete, P: Replace, L: Move cursor left, R: Move cursor right, E: Exit): ");
        scanf(" %s", input);

        // Convert command to uppercase for easier comparison
        char command = toupper(input[0]);

        if (command == 'E')
        {
            break;
        }
        else if (command == 'I')
        {
            char insertText[MAX_TEXT_LENGTH];
            printf("Enter text to insert: ");
            scanf(" %[^\n]s", insertText);

            // Check if there is enough space in the text to insert the new text
            if (strlen(text) + strlen(insertText) < MAX_TEXT_LENGTH)
            {
                // Shift the existing text to the right to make space for the new text
                memmove(text + cursorPosition + strlen(insertText), text + cursorPosition, strlen(text + cursorPosition) + 1);
                // Insert the new text at the cursor position
                strncpy(text + cursorPosition, insertText, strlen(insertText));
                cursorPosition += strlen(insertText);
            }
            else
            {
                printf("Not enough space to insert the text.\n");
            }
        }
        else if (command == 'D')
        {
            int numDelete;
            printf("Enter number of characters to delete: ");
            scanf("%d", &numDelete);

            // Check if there are enough characters in the text to delete
            if (strlen(text) >= numDelete)
            {
                // Shift the remaining text to the left to overwrite the deleted characters
                memmove(text + cursorPosition, text + cursorPosition + numDelete, strlen(text + cursorPosition + numDelete) + 1);
            }
            else
            {
                printf("Not enough characters to delete.\n");
            }
        }
        else if (command == 'P')
        {
            char replaceText[MAX_TEXT_LENGTH];
            printf("Enter text to replace: ");
            scanf(" %[^\n]s", replaceText);

            // Check if there is enough space in the text to replace the old text with the new text
            if (strlen(text) - cursorPosition >= strlen(replaceText))
            {
                // Replace the old text with the new text
                strncpy(text + cursorPosition, replaceText, strlen(replaceText));
                cursorPosition += strlen(replaceText);
            }
            else
            {
                printf("Not enough space to replace the text.\n");
            }
        }
        else if (command == 'L')
        {
            if (cursorPosition > 0)
            {
                cursorPosition--;
            }
        }
        else if (command == 'R')
        {
            if (cursorPosition < strlen(text))
            {
                cursorPosition++;
            }
        }
        else
        {
            printf("Invalid command. Try again.\n");
        }
    }

    return 0;
}