/*
 * this is a deno script to clean up the m3u8 files from the music player
 * 
 */

import { opendir, readFile, writeFile } from 'node:fs/promises';
import * as path from "jsr:@std/path";
import { Dirent } from 'node:fs';

/**
 * longEnough will be true if splitting the line gave 3+ sections, and false if it's too short
 * 
 * @param cleanLine 
 * @returns [cleanLine, longEnough]
 */
function replaceLineDashes(cleanLine: string): [string, boolean] {
    const spl = cleanLine.split(' - ')
    if (spl.length < 3) {
        return [spl.join(' // '), false]
    }

    const [spl1, spl2, ...splRemain] = spl
    const spl3 = splRemain.join(' - ')

    return [[spl1, spl2, spl3].join(' // '), true]
}

// loop through every line of the file and clean up each line
function cleanFile(dirent: Dirent, content: string): string {
    const lines = content.split('\n')
    const cleanLines: string[] = []
    
    for (let i = 0; i < lines.length; i++) {
        const line = lines[i].trim()

        if (!line || line.startsWith("#")) {
            continue
        }

        const ext = path.extname(line)
        const name = path.basename(line, ext)
        
        let cleanLine = name
            .replace(/ - Single/g, '')
            .replace(/- \d+ -/g, '-')

        const [updatedCleanLine, longEnough] = replaceLineDashes(cleanLine)
        cleanLine = updatedCleanLine

        if (!longEnough) {
            cleanLine = `BAD LINE --- ${cleanLine}`
            const fileName = path.basename(dirent.name)
            console.log(`Bad Line found in ${fileName} on line ${i+1}: \t${line}`)
        }

        cleanLines.push(cleanLine)
    }

    return cleanLines.join('\n') + '\n'
}

// get details from the file, ensure it's a playlist file, then store the updated file contents to a txt file
async function processFile(dirent: Dirent) {
    if (dirent.isFile()) {
        const ext = path.extname(dirent.name)
        const name = path.basename(dirent.name, ext)
        const dirname = path.dirname(dirent.name)
        const newPath = path.join(dirname, `${name}.txt`)

        if (ext.toUpperCase() === ".M3U8") {
            const fileContent = await readFile(dirent.name)
            const cleanContent = cleanFile(dirent, fileContent.toString())
            await writeFile(newPath, cleanContent)
        }
    }
}

// loop through every file in the current directory
try {
    const dir = await opendir('./');
    for await (const dirent of dir) {
        await processFile(dirent)
    }
} catch (err) {
    console.error(err)
}