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// Area ID
#[derive(Clone, Copy)]
#[allow(dead_code)]
pub(crate) enum Area {
    ProcessInput = 0x81,
    ProcessOutput = 0x82,
    /// Merkers are address registers within the CPU.
    /// The number of available flag bytes depends on the respective CPU and can be taken from the technical data.
    /// You can use flag bits, flag bytes, flag words or flag double words in a PLC program.
    Merker = 0x83,
    /// German thing, means building blocks
    /// This is your storage  
    DataBausteine = 0x84,
    Counter = 0x1C,
    Timer = 0x1D,
    Unknown,
}

// Word Length
pub const WL_BIT: i32 = 0x01; //Bit (inside a word)
pub const WL_BYTE: i32 = 0x02; //Byte (8 bit)
pub const WL_CHAR: i32 = 0x03;
pub const WL_WORD: i32 = 0x04; //Word (16 bit)
pub const WL_INT: i32 = 0x05;
pub const WL_DWORD: i32 = 0x06; //Double Word (32 bit)
pub const WL_DINT: i32 = 0x07;
pub const WL_REAL: i32 = 0x08; //Real (32 bit float)
pub const WL_COUNTER: i32 = 0x1C; //Counter (16 bit)
pub const WL_TIMER: i32 = 0x1D; //Timer (16 bit)

//dataSize to number of byte accordingly
pub fn data_size_byte(word_length: i32) -> i32 {
    match word_length {
        WL_BIT | WL_BYTE | WL_CHAR => 1,
        WL_WORD | WL_INT | WL_COUNTER | WL_TIMER => 2,
        WL_DWORD | WL_DINT | WL_REAL => 4,
        _ => 0,
    }
}

// PLC Status
//todo implement start stop status commands
#[allow(dead_code)]
pub const CPU_STATUS_UNKNOWN: i32 = 0;
#[allow(dead_code)]
pub const CPU_STATUS_RUN: i32 = 8;
#[allow(dead_code)]
pub const CPU_STATUS_STOP: i32 = 4;

//size header
pub const SIZE_HEADER_READ: i32 = 31; // Header Size when Reading
pub const SIZE_HEADER_WRITE: i32 = 35; // Header Size when Writing

// Result transport size
pub const TS_RES_BIT: i32 = 3;
pub const TS_RES_BYTE: i32 = 4;
#[allow(dead_code)]
pub const TS_RES_INT: i32 = 5;
//todo implement read write multi
#[allow(dead_code)]
pub const TS_RES_REAL: i32 = 7;
pub const TS_RES_OCTET: i32 = 9;