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package Torello.Java;

import java.util.stream.Stream;
import java.io.IOException;

class SingleLineRegExMatch_ONE_FILE 
{
    static InternalSED.ResultsSED handleOneFile(
            final String        fileName,
            final FileNode      file,
            final String        fileAsStr,
            final CONFIG_RECORD userConfig
        )
        throws IOException
    {
        // Split into Lines As java.lang.String
        final String[] lines = fileAsStr.split("\n");

        // This is used for a minor optimization.
        final SingleLineRegExMatch_ONE_LINE.LoopHelper loopHelper =
            new SingleLineRegExMatch_ONE_LINE.LoopHelper(userConfig);

        // Iterate each line of the file.
        for (int curLineNum=0; curLineNum < lines.length; curLineNum++)
            SingleLineRegExMatch_ONE_LINE
                .handleOneLine(lines[curLineNum], curLineNum, loopHelper);

        // If no changes occured, then there is just nothing to do
        if (loopHelper.matchCount == 0) return InternalSED.NO_CHANGES_RET;

        // All Printing-Records, from a Sream.Builder into an Array
        final PrintingRecSingleLine[] PRSLA =
            loopHelper.PRSLB.build().toArray(PrintingRecSingleLine[]::new);

        // unless Verbosity.Silent was requested, print the matches.
        if (userConfig.verbosity.level > 0) PrintingRecSingleLine.printAll
            (PRSLA, userConfig.useUNIXColors, userConfig.appendable, userConfig.verbosity);

        // Query the User about his or her feelings (after showing the matches)
        if (userConfig.askFirst) if (! Q.YN("Re-Write the Updated File to Disk?"))
            return InternalSED.NO_CHANGES_RET;

        // The updated file was constructed inside the LoopHelper's 'newFileSB' StringBuilder
        return new InternalSED.ResultsSED(loopHelper.newFileSB.toString(), loopHelper.matchCount);
    }
}