1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116

/*
 * MIT License
 *
 * Copyright (c) [2022] [Ondrej Babec <ond.babec@gmail.com>]
 *
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to deal
 * in the Software without restriction, including without limitation the rights
 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in all
 * copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
 * SOFTWARE.
 */

use heapless::Vec;

use crate::encoding::variable_byte_integer::VariableByteIntegerEncoder;
use crate::packet::v5::mqtt_packet::Packet;
use crate::utils::buffer_reader::BuffReader;
use crate::utils::buffer_writer::BuffWriter;
use crate::utils::types::BufferError;

use super::packet_type::PacketType;
use super::property::Property;

pub struct DisconnectPacket<'a, const MAX_PROPERTIES: usize> {
    // 7 - 4 mqtt control packet type, 3-0 flagy
    pub fixed_header: u8,
    // 1 - 4 B lenght of variable header + len of payload
    pub remain_len: u32,

    pub disconnect_reason: u8,

    pub property_len: u32,

    pub properties: Vec<Property<'a>, MAX_PROPERTIES>,
}

impl<'a, const MAX_PROPERTIES: usize> DisconnectPacket<'a, MAX_PROPERTIES> {
    fn add_reason(&mut self, reason: u8) {
        self.disconnect_reason = reason;
    }
}

impl<'a, const MAX_PROPERTIES: usize> Packet<'a> for DisconnectPacket<'a, MAX_PROPERTIES> {
    fn new() -> Self {
        Self {
            fixed_header: PacketType::Disconnect.into(),
            remain_len: 5,
            disconnect_reason: 0x00,
            property_len: 0,
            properties: Vec::<Property<'a>, MAX_PROPERTIES>::new(),
        }
    }

    fn encode(&mut self, buffer: &mut [u8], buffer_len: usize) -> Result<usize, BufferError> {
        let mut buff_writer = BuffWriter::new(buffer, buffer_len);
        buff_writer.write_u8(self.fixed_header)?;
        let property_len_enc = VariableByteIntegerEncoder::encode(self.property_len)?;
        let property_len_len = VariableByteIntegerEncoder::len(property_len_enc);

        let rm_len: u32 = 1 + self.property_len + property_len_len as u32;
        buff_writer.write_variable_byte_int(rm_len)?;
        buff_writer.write_u8(self.disconnect_reason)?;
        buff_writer.write_variable_byte_int(self.property_len)?;
        buff_writer.write_properties(&self.properties)?;
        Ok(buff_writer.position)
    }

    fn decode(&mut self, buff_reader: &mut BuffReader<'a>) -> Result<(), BufferError> {
        if self.decode_fixed_header(buff_reader)? != PacketType::Disconnect {
            error!("Packet you are trying to decode is not DISCONNECT packet!");
            return Err(BufferError::WrongPacketToDecode);
        }
        if self.remain_len == 0 {
            self.disconnect_reason = 0x00;
            return Ok(());
        }
        self.disconnect_reason = buff_reader.read_u8()?;
        self.decode_properties(buff_reader)
    }

    fn set_property_len(&mut self, value: u32) {
        self.property_len = value;
    }

    fn get_property_len(&mut self) -> u32 {
        self.property_len
    }

    fn push_to_properties(&mut self, property: Property<'a>) {
        self.properties.push(property);
    }

    fn property_allowed(&mut self, property: &Property<'a>) -> bool {
        property.disconnect_property()
    }

    fn set_fixed_header(&mut self, header: u8) {
        self.fixed_header = header;
    }

    fn set_remaining_len(&mut self, remaining_len: u32) {
        self.remain_len = remaining_len;
    }
}