/**
 * Zalgo Text Generator
 * Generates corrupted/glitched text using Unicode combining characters
 */

/* exported ZalgoGenerator */

class ZalgoGenerator {
    constructor() {
        // Combining diacritical marks that appear above characters
        this.above = [
            '\u0300',
            '\u0301',
            '\u0302',
            '\u0303',
            '\u0304',
            '\u0305',
            '\u0306',
            '\u0307',
            '\u0308',
            '\u0309',
            '\u030A',
            '\u030B',
            '\u030C',
            '\u030D',
            '\u030E',
            '\u030F',
            '\u0310',
            '\u0311',
            '\u0312',
            '\u0313',
            '\u0314',
            '\u0315',
            '\u0316',
            '\u0317',
            '\u0318',
            '\u0319',
            '\u031A',
            '\u031B',
            '\u031C',
            '\u031D',
            '\u031E',
            '\u031F',
            '\u0320',
            '\u0321',
            '\u0322',
            '\u0323',
            '\u0324',
            '\u0325',
            '\u0326',
            '\u0327',
            '\u0328',
            '\u0329',
            '\u032A',
            '\u032B',
            '\u032C',
            '\u032D',
            '\u032E',
            '\u032F',
            '\u0330',
            '\u0331',
            '\u0332',
            '\u0333',
            '\u0334',
            '\u0335',
            '\u0336',
            '\u0337',
            '\u0338',
            '\u0339',
            '\u033A',
            '\u033B',
            '\u033C',
            '\u033D',
            '\u033E',
            '\u033F',
            '\u0340',
            '\u0341',
            '\u0342',
            '\u0343',
            '\u0344',
            '\u0345',
            '\u0346',
            '\u0347',
            '\u0348',
            '\u0349',
            '\u034A',
            '\u034B',
            '\u034C',
            '\u034D',
            '\u034E',
            '\u034F',
            '\u0350',
            '\u0351',
            '\u0352',
            '\u0353',
            '\u0354',
            '\u0355',
            '\u0356',
            '\u0357',
            '\u0358',
            '\u0359',
            '\u035A',
            '\u035B',
            '\u035C',
            '\u035D',
            '\u035E',
            '\u035F',
            '\u0360',
            '\u0361',
            '\u0362',
            '\u0363',
            '\u0364',
            '\u0365',
            '\u0366',
            '\u0367',
            '\u0368',
            '\u0369',
            '\u036A',
            '\u036B',
            '\u036C',
            '\u036D',
            '\u036E',
            '\u036F',
        ];

        // Combining diacritical marks that appear in the middle
        this.middle = [
            '\u0315',
            '\u031B',
            '\u0340',
            '\u0341',
            '\u0358',
            '\u0321',
            '\u0322',
            '\u0327',
            '\u0328',
            '\u0334',
            '\u0335',
            '\u0336',
            '\u034F',
            '\u035C',
            '\u035D',
            '\u035E',
            '\u035F',
            '\u0360',
            '\u0362',
            '\u0338',
            '\u0337',
            '\u0361',
            '\u0489',
        ];

        // Combining diacritical marks that appear below characters
        this.below = [
            '\u0316',
            '\u0317',
            '\u0318',
            '\u0319',
            '\u031C',
            '\u031D',
            '\u031E',
            '\u031F',
            '\u0320',
            '\u0324',
            '\u0325',
            '\u0326',
            '\u0329',
            '\u032A',
            '\u032B',
            '\u032C',
            '\u032D',
            '\u032E',
            '\u032F',
            '\u0330',
            '\u0331',
            '\u0332',
            '\u0333',
            '\u0339',
            '\u033A',
            '\u033B',
            '\u033C',
            '\u0345',
            '\u0347',
            '\u0348',
            '\u0349',
            '\u034D',
            '\u034E',
            '\u0353',
            '\u0354',
            '\u0355',
            '\u0356',
            '\u0359',
            '\u035A',
            '\u0323',
        ];
    }

    /**
     * Get a random character from an array
     */
    randomChar(array) {
        return array[Math.floor(Math.random() * array.length)];
    }

    /**
     * Generate a specified number of random characters from an array
     */
    randomChars(array, count) {
        let result = '';
        for (let i = 0; i < count; i++) {
            result += this.randomChar(array);
        }
        return result;
    }

    /**
     * Generate zalgo text with specified intensity
     * @param {string} text - The input text to corrupt
     * @param {number} intensity - Corruption intensity (1-10)
     * @returns {string} - The corrupted zalgo text
     */
    generate(text, intensity = 5) {
        if (!text) return '';

        // Normalize intensity to 1-10 range
        intensity = Math.max(1, Math.min(10, intensity));

        let result = '';

        for (let char of text) {
            result += char;

            // Skip whitespace and newlines
            if (/\s/.test(char)) {
                continue;
            }

            // Calculate how many combining characters to add based on intensity
            // Higher intensity = more corruption
            const factor = intensity / 10;

            // Add characters above (0-3 based on intensity)
            const aboveCount = Math.floor(Math.random() * (4 * factor));
            result += this.randomChars(this.above, aboveCount);

            // Add characters in middle (0-2 based on intensity)
            const middleCount = Math.floor(Math.random() * (3 * factor));
            result += this.randomChars(this.middle, middleCount);

            // Add characters below (0-3 based on intensity)
            const belowCount = Math.floor(Math.random() * (4 * factor));
            result += this.randomChars(this.below, belowCount);
        }

        return result;
    }

    /**
     * Remove zalgo corruption from text
     * @param {string} text - The corrupted text
     * @returns {string} - Clean text without combining characters
     */
    clean(text) {
        // Remove all combining characters (Unicode category Mn)
        return text.replace(/[\u0300-\u036f\u0489]/g, '');
    }
}