package net.knarcraft.ffmpegconverter;

import net.knarcraft.ffmpegconverter.converter.AbstractConverter;
import net.knarcraft.ffmpegconverter.converter.AnimeConverter;
import net.knarcraft.ffmpegconverter.converter.AudioConverter;
import net.knarcraft.ffmpegconverter.converter.VideoConverter;
import net.knarcraft.ffmpegconverter.converter.WebVideoConverter;
import net.knarcraft.ffmpegconverter.utility.FileUtil;
import net.knarcraft.ffmpegconverter.utility.ListUtil;
import net.knarcraft.ffmpegconverter.utility.OutputUtil;

import java.io.File;
import java.io.IOException;
import java.util.List;
import java.util.Scanner;

import static net.knarcraft.ffmpegconverter.utility.Parser.tokenize;

/**
 * The main class for starting the software
 */
class Main {
    private static final String FFPROBE_PATH = "ffprobe"; //Can be just ffprobe if it's in the path
    private static final String FFMPEG_PATH = "ffmpeg"; //Can be just ffmpeg if it's in the path
    private static final Scanner READER = new Scanner(System.in, "UTF-8");
    private static AbstractConverter converter = null;

    public static void main(String[] args) throws IOException {
        loadConverter();

        List<String> input;
        do {
            OutputUtil.println("<Folder/File> [Recursions]:");
            input = readInput(2);
        } while (input.isEmpty());
        File folder = new File(input.get(0));

        int recursionSteps = 1;
        if (input.size() > 1) {
            try {
                recursionSteps = Integer.parseInt(input.get(1));
            } catch (NumberFormatException e) {
                OutputUtil.println("Recursion steps is invalid and will be ignored.");
            }
        }

        convertAllFiles(folder, recursionSteps);
        OutputUtil.close();
    }

    /**
     * Asks the user which converter they want, and assigns a converter instance to the converter variable
     *
     * @throws IOException <p>If there's a problem getting user input.</p>
     */
    private static void loadConverter() throws IOException {
        int choice = getChoice("Which converter do you want do use?\n1. Anime to web mp4\n2. Audio converter\n" +
                "3. VideoStream converter", 1, 4);

        OutputUtil.println("Input for this converter:");
        switch (choice) {
            case 1:
                animeConverter();
                break;
            case 2:
                converter = new AudioConverter(FFPROBE_PATH, FFMPEG_PATH, getChoice("<output extension>"));
                break;
            case 3:
                converter = new VideoConverter(FFPROBE_PATH, FFMPEG_PATH, getChoice("<output extension>"));
                break;
            case 4:
                converter = new WebVideoConverter(FFPROBE_PATH, FFMPEG_PATH, getChoice("<output extension>"));
                break;
            default:
                System.exit(1);
        }
    }

    /**
     * Converts the file(s) as specified
     *
     * @param fileOrFolder   <p>A file or a folder.</p>
     * @param recursionSteps <p>The depth to recurse if a folder is given.</p>
     * @throws IOException <p>If conversion or writing fails.</p>
     */
    private static void convertAllFiles(File fileOrFolder, int recursionSteps) throws IOException {
        if (fileOrFolder.isDirectory()) {
            File[] files = FileUtil.listFilesRecursive(fileOrFolder, converter.getValidFormats(), recursionSteps);
            if (files != null && files.length > 0) {
                for (File file : files) {
                    converter.convert(file);
                }
            } else {
                OutputUtil.println("No valid files found in folder.");
            }
        } else if (fileOrFolder.exists()) {
            converter.convert(fileOrFolder);
        } else {
            OutputUtil.println("Path " + fileOrFolder.getAbsolutePath() + " does not point to any file or folder.");
        }
    }

    /**
     * Initializes the anime converter
     *
     * @throws IOException <p>If reading or writing fails.</p>
     */
    private static void animeConverter() throws IOException {
        OutputUtil.println("[Audio languages jpn,eng,ger,fre] [Subtitle languages eng,ger,fre] [Convert to stereo if " +
                "necessary true/false] [Prevent signs&songs subtitles true/false]\nYour input: ");
        List<String> input = readInput(4);
        String[] audioLanguage = new String[]{"jpn", "0"};
        String[] subtitleLanguage = new String[]{"eng", "0"};
        boolean toStereo = true;
        boolean preventSigns = true;
        if (input.size() > 0 && ListUtil.getListFromCommaSeparatedString(input.get(0)) != null) {
            audioLanguage = ListUtil.getListFromCommaSeparatedString(input.get(0));
        }
        if (input.size() > 1 && ListUtil.getListFromCommaSeparatedString(input.get(1)) != null) {
            subtitleLanguage = ListUtil.getListFromCommaSeparatedString(input.get(1));
        }
        if (input.size() > 2) {
            toStereo = Boolean.parseBoolean(input.get(2));
        }
        if (input.size() > 3) {
            preventSigns = Boolean.parseBoolean(input.get(3));
        }
        converter = new AnimeConverter(FFPROBE_PATH, FFMPEG_PATH, audioLanguage, subtitleLanguage, toStereo, preventSigns);
    }


    /**
     * Reads a number of tokens from the user input
     *
     * @param max <p>The number of tokens expected.</p>
     * @return <p>A list of tokens.</p>
     */
    private static List<String> readInput(int max) {
        List<String> tokens = tokenize(READER.nextLine());
        if (max < tokens.size()) {
            throw new IllegalArgumentException("Input contains " + tokens.size() +
                    " arguments, but the input only supports " + max + " arguments.");
        }
        return tokens;
    }

    /**
     * Gets the user's choice
     *
     * @param prompt <p>The prompt shown to the user.</p>
     * @return <p>The non-empty choice given by the user.</p>
     * @throws IOException <p>If reading or writing fails.</p>
     */
    private static String getChoice(String prompt) throws IOException {
        OutputUtil.println(prompt);
        String choice = "";
        while (choice.equals("")) {
            OutputUtil.println("Your input: ");
            choice = READER.nextLine();
        }
        return choice;
    }

    /**
     * Gets an integer from the user
     *
     * @param prompt The prompt to give the user
     * @param min    The minimum allowed value
     * @param max    The maximum allowed value
     * @return The value given by the user
     */
    private static int getChoice(String prompt, int min, int max) throws IOException {
        OutputUtil.println(prompt);
        int choice = Integer.MIN_VALUE;
        do {
            OutputUtil.println("Your input: ");
            try {
                choice = Integer.parseInt(READER.next());
            } catch (NumberFormatException e) {
                OutputUtil.println("Invalid choice. Please try again.");
            } finally {
                READER.nextLine();
            }
        } while (choice < min || choice > max);
        return choice;
    }
}