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use std::io::{Read, Write};
use std::fmt;

use crate::{
    encoding::*,
    date_time::*,
    status_codes::StatusCode,
};

/// This primitive data type is a UInt32 that is used as an identifier, such as a handle.
/// All values, except for 0, are valid. IntegerId = 288,
pub type IntegerId = u32;

const MESSAGE_SECURITY_MODE_NONE: &str = "None";
const MESSAGE_SECURITY_MODE_SIGN: &str = "Sign";
const MESSAGE_SECURITY_MODE_SIGN_AND_ENCRYPT: &str = "SignAndEncrypt";

/// The MessageSecurityMode is an enumeration that specifies what security should be applied to messages exchanges during a Session.
#[derive(Debug, Clone, PartialEq, PartialOrd, Copy)]
pub enum MessageSecurityMode {
    /// The MessageSecurityMode is invalid. This value is the default value to ensure that unless
    /// explicitly set, a connection will be rejected.
    Invalid = 0,
    /// No security is applied. This assumes a plaintext security policy.
    None = 1,
    /// All messages are signed but not encrypted.
    Sign = 2,
    /// All messages are signed and encrypted.
    SignAndEncrypt = 3,
}

impl BinaryEncoder<MessageSecurityMode> for MessageSecurityMode {
    fn byte_len(&self) -> usize {
        4
    }

    fn encode<S: Write>(&self, stream: &mut S) -> EncodingResult<usize> {
        // All enums are Int32
        write_i32(stream, *self as i32)
    }

    fn decode<S: Read>(stream: &mut S, _: &DecodingLimits) -> EncodingResult<Self> {
        // All enums are Int32
        let value = read_i32(stream)?;
        Ok(match value {
            0 => MessageSecurityMode::Invalid,
            1 => MessageSecurityMode::None,
            2 => MessageSecurityMode::Sign,
            3 => MessageSecurityMode::SignAndEncrypt,
            _ => {
                error!("Mode value is invalid = {}", value);
                MessageSecurityMode::Invalid
            }
        })
    }
}

impl fmt::Display for MessageSecurityMode {
    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
        let name = match *self {
            MessageSecurityMode::None => MESSAGE_SECURITY_MODE_NONE,
            MessageSecurityMode::Sign => MESSAGE_SECURITY_MODE_SIGN,
            MessageSecurityMode::SignAndEncrypt => MESSAGE_SECURITY_MODE_SIGN_AND_ENCRYPT,
            _ => "",
        };
        write!(f, "{}", name)
    }
}

impl From<MessageSecurityMode> for String {
    fn from(security_mode: MessageSecurityMode) -> Self {
        String::from(
            match security_mode {
                MessageSecurityMode::None => MESSAGE_SECURITY_MODE_NONE,
                MessageSecurityMode::Sign => MESSAGE_SECURITY_MODE_SIGN,
                MessageSecurityMode::SignAndEncrypt => MESSAGE_SECURITY_MODE_SIGN_AND_ENCRYPT,
                _ => "",
            }
        )
    }
}

impl<'a> From<&'a str> for MessageSecurityMode {
    fn from(str: &'a str) -> Self {
        match str {
            MESSAGE_SECURITY_MODE_NONE => MessageSecurityMode::None,
            MESSAGE_SECURITY_MODE_SIGN => MessageSecurityMode::Sign,
            MESSAGE_SECURITY_MODE_SIGN_AND_ENCRYPT => MessageSecurityMode::SignAndEncrypt,
            _ => {
                error!("Specified security mode {} is not recognized", str);
                MessageSecurityMode::Invalid
            }
        }
    }
}

/// This Simple DataType is a Double that defines an interval of time in milliseconds (fractions can
/// be used to define sub-millisecond values). Negative values are generally invalid but may have
/// special meanings where the Duration is used. Duration = 290,
pub type Duration = f64;

/// UtcTime = 294,
pub type UtcTime = DateTime;

#[derive(Debug, Clone, PartialEq, Copy, Serialize)]
pub enum MonitoringMode {
    Disabled = 0,
    Sampling = 1,
    Reporting = 2,
}

impl BinaryEncoder<MonitoringMode> for MonitoringMode {
    fn byte_len(&self) -> usize {
        4
    }

    fn encode<S: Write>(&self, stream: &mut S) -> EncodingResult<usize> {
        // All enums are Int32
        write_i32(stream, *self as i32)
    }

    fn decode<S: Read>(stream: &mut S, _: &DecodingLimits) -> EncodingResult<Self> {
        // All enums are Int32
        let value = read_i32(stream)?;
        match value {
            0 => Ok(MonitoringMode::Disabled),
            1 => Ok(MonitoringMode::Sampling),
            2 => Ok(MonitoringMode::Reporting),
            _ => {
                error!("Don't know what monitoring mode {} is", value);
                Err(StatusCode::BadDecodingError)
            }
        }
    }
}