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package Torello.JavaDoc;

import Torello.Java.StrCmpr;
import Torello.Java.ReadOnly.ReadOnlyList;

import Torello.Java.Additional.Ret2;

import java.util.Objects;
import java.io.File;

class MainConstructor
{
    static Ret2<String, ReadOnlyList<String>> run(
            final String rootJavaDocDirectory,
            final String... rootSourceFileDirectories
        )
    {

        // System.out.println("rootJavaDocDirectory = [" + rootJavaDocDirectory + "]\n" +
        //                    "rootSourceFileDirectory = [" + rootSourceFileDirectory + "]");

        Objects.requireNonNull(
            rootJavaDocDirectory,
            "You have passed 'null' to parameter 'rootJavaDocDirectory'"
        );

        Objects.requireNonNull(
            rootSourceFileDirectories,
            "You have passed 'null' to parameter 'rootSourceFileDirectories'"
        );

        // NOTE: Java seems to have no problem with '.' and '..' inside of a File-Name
        if (StrCmpr.containsOR(rootJavaDocDirectory, "*", "?"))

            throw new UpgradeException(
                "The Root JavaDoc Directory String you have passed contains either the '*' " +
                "character, or the '?', but these is not allowed."
            );

        // Check for these errors inside the Root Source Directories too.
        for (String s : rootSourceFileDirectories) if (StrCmpr.containsOR(s, "*", "?"))

            throw new UpgradeException(
                "One of the Root Source Directory Strings that you have passed contains either " +
                "the '*' character, or the '?', but these is not allowed."
            );

        if (rootSourceFileDirectories.length == 0) throw new UpgradeException(
            "You have not passed any source-code directories to parameter " +
            "'rootSourceFileDirectories'"
        );

        /*
        // THIS HAS TO BE MOVED / COPIED
        if (rootJavaDocDirectory.length() > 0)
            UpgradeException.checkFileExistsAndCanAccess
                (rootJavaDocDirectory, "Root '.html' Java-Doc Documentation Page Directory");
        */

        for (String rootSourceDir : rootSourceFileDirectories)
            if (rootSourceDir.length() > 0)
                UpgradeException.checkFileExistsAndCanAccess
                    (rootSourceDir, "Root '.java' Source File Directory");

        // Easier to type "rsd" in the code below
        final String[] rsd = new String[rootSourceFileDirectories.length];


        // *** *** *** *** *** *** *** *** *** *** *** *** *** *** *** *** *** *** *** *** *** ***
        // Ensure File.separator is at the end of each of these directory-names - except dir ""
        // *** *** *** *** *** *** *** *** *** *** *** *** *** *** *** *** *** *** *** *** *** ***
        //
        // If the directory is the "Current Working Directory" - which is specified by the
        // Zero-Length-String (a.k.a ""), then a trailing File.separator should **NOT** be added.
        // All other directory names must end with the File.separator
        //
        // NOTE: For checking that a directory exists and can be accessed (the previous lines of
        //       code), the class java.io.File doesn't require that there be a trailing File
        //       Separator.  However, in this package (the JD-Upgrader Package), appending file
        //       names to these root-directories mandates that the File-Separator be present at the
        //       end of each of these directory-names - except, of course, the "" directory - which
        //       is the "Current Working Directory."
        //
        // SPECIFICALLY: Later on when these Upgrade-Fields are actually used by the class
        //               "MainFilesProcessor" - making sure these directory-names end with '/' is
        //               where this stuff actually comes into play

        for (int i=0; i < rootSourceFileDirectories.length; i++)

            // DON'T FORGET: This *DOES NOT* end with File.separator - but it doesn't have to!
            if (rootSourceFileDirectories[i].length() == 0)
                rsd[i] = "";

            else if (rootSourceFileDirectories[i].endsWith(File.separator))
                rsd[i] = rootSourceFileDirectories[i];

            else
                rsd[i] = rootSourceFileDirectories[i] + File.separator;


        // if (rsd == null) System.out.println("rsd is null!!!");
        // else System.out.println(Arrays.toString(rsd));
        // 
        // this.pathsTypesBuilder.rootSourceFileDirectories = ReadOnlyList.of(rsd);

        final ReadOnlyList<String> RSFD = ReadOnlyList.of(rsd);


        // *** *** *** *** *** *** *** *** *** *** *** *** *** *** *** *** *** *** *** *** *** ***
        // Make sure the File.separator is here too, unless Root-JD-Dir is the CWD (the "" dir)
        // *** *** *** *** *** *** *** *** *** *** *** *** *** *** *** *** *** *** *** *** *** ***


        // this.pathsTypesBuilder.rootJavaDocDirectory =
        final String RJDD;

        // This *DOES NOT* end with File.separator - but it doesn't have to!
        if (rootJavaDocDirectory.length() == 0)
            RJDD = "";

        else if (rootJavaDocDirectory.endsWith(File.separator))
            RJDD = rootJavaDocDirectory;

        else
            RJDD = rootJavaDocDirectory + File.separator;

        return new Ret2<String, ReadOnlyList<String>>(RJDD, RSFD);
    }
}