import fileio;

var PATH: string const = "scripts:/lib/file/fileio.txt";

// reset file to orginal state
fn reset() {
    var writer = open(PATH, "w");
    writer.write("Hello, World!\n");

    writer.close();
}

// test global constants
{
    assert MAX_FILENAME_SIZE > 0, "MAX_FILENAME_SIZE failed";
    assert MAX_FILES_OPEN > 0, "MAX_FILES_OPEN failed";
    assert END_OF_FILE == -1, "END_OF_FILE failed";
}

// test read
{
    var reader = open("scripts:/lib/file/inputs.txt", "r");

    assert reader.read(int) == 8, "read int failed";
    assert reader.read(float) == 12.5, "read float failed";
    assert reader.read(string) == "\ntest\n", "read string failed";

    // invaild types
    assert input.read(type) == null, "read type failed";
    assert input.read(any) == null, "read any failed";

    reader.close();
}

// test write
{
    var writer = open("scripts:/lib/file/outputs.txt", "w");
    assert writer.write(8) == true, "write int failed";
    assert writer.write("\n") == true, "write string failed";
    assert writer.write(12.5) == true, "write float failed";

    writer.close();
}


// test open and close
{
    var reader = open(PATH, "r");
    assert reader != null, "open failed in reading mode";

    assert reader.close() == true, "close failed";

    var file = open("scripts:/doesNotExist", "r");
    assert file == null, "open failed on nonexisting file";
}

// test write
{
    var writer = open(PATH, "w");
    assert writer != null, "open failed in writing mode";

    assert writer.read(string) != null, "read in writing mode failed";
    assert writer.write("writen text") == true, "write in writing mode failed";

    writer.close();
    reset();
}

// test append
{
    var appender = open(PATH, "a");
    assert appender != null, "open failed on appending file";

    assert appender.write("appended text") == true, "append failed";

    appender.close();
    reset();
}

// test read extended
{
    var reader = open(PATH, "r+");
    assert reader != null, "open failed on read extended mode";

    assert reader.write("writen text") == true, "write in read extended failed";
    assert reader.read(string) == "d!\n", "read in read extended failed";

    reader.close();
    reset();
}

// test write extended
{
    var writer = open(PATH, "w+");
    assert writer != null, "open failed on write extended mode";

    assert writer.write("writen text") == true, "write in write extended failed";

    writer.seek("bgn", 0);

    assert writer.read(string) == "writen text", "read in write extended failed";

    writer.close();
    reset();
}

// test rename
{
    var reader = open(PATH, "r");
    assert reader.rename("scripts:/lib/file/newName.txt") == true, "rename failed";

    reader.rename(PATH);
    reader.close();
}

// test seek
{
    var reader = open(PATH, "r");
    assert reader.seek("bgn", 6) == true, "seek operation failed";

    var contents = reader.read(string);
    assert contents == " World!\n", "seek failed to move file position";

    reader.close();
}

// test accessors
{
    var reader = open(PATH, "r");

    assert reader.error() == false, "error failed";
    assert reader.completed() == false, "completed failed";
    assert reader.position() == 0, "position failed";
    assert reader.size() == 14, "size failed";
    assert reader.mode() == "r", "mode failed"; 

    reader.read(string);

    assert reader.error() == false, "error failed";
    assert reader.completed() == true, "completed after read failed";
    assert reader.position() == 14, "position failed";
    assert reader.size() == 14, "size failed";
    assert reader.mode() == "r", "mode failed"; 

    reader.close();
}

print "All good";