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
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146

use super::{
    data_information::{Data, DataFieldCoding, DataInformation, DataInformationBlock},
    value_information::{ValueInformation, ValueInformationBlock, ValueLabel},
    variable_user_data::DataRecordError,
};
#[cfg_attr(feature = "serde", derive(serde::Serialize))]
#[derive(Debug, PartialEq)]
pub struct RawDataRecordHeader<'a> {
    pub data_information_block: DataInformationBlock<'a>,
    pub value_information_block: ValueInformationBlock,
}
#[cfg_attr(feature = "serde", derive(serde::Serialize, serde::Deserialize))]
#[derive(Debug, PartialEq)]
pub struct ProcessedDataRecordHeader {
    pub data_information: DataInformation,
    pub value_information: ValueInformation,
}
#[cfg_attr(feature = "serde", derive(serde::Serialize))]
#[derive(Debug, PartialEq)]
pub struct DataRecord<'a> {
    pub data_record_header: DataRecordHeader<'a>,
    pub data: Data<'a>,
}

impl DataRecord<'_> {
    #[must_use]
    pub fn get_size(&self) -> usize {
        self.data_record_header.get_size() + self.data.get_size()
    }
}
#[cfg_attr(feature = "serde", derive(serde::Serialize))]
#[derive(Debug, PartialEq)]
pub struct DataRecordHeader<'a> {
    pub raw_data_record_header: RawDataRecordHeader<'a>,
    pub processed_data_record_header: ProcessedDataRecordHeader,
}

impl DataRecordHeader<'_> {
    #[must_use]
    pub fn get_size(&self) -> usize {
        self.raw_data_record_header
            .data_information_block
            .get_size()
            + self
                .raw_data_record_header
                .value_information_block
                .get_size()
    }
}

impl<'a> TryFrom<&'a [u8]> for RawDataRecordHeader<'a> {
    type Error = DataRecordError;
    fn try_from(data: &[u8]) -> Result<RawDataRecordHeader, DataRecordError> {
        let difb = DataInformationBlock::try_from(data)?;
        let offset = difb.get_size();
        let vifb = ValueInformationBlock::try_from(
            data.get(offset..)
                .ok_or(DataRecordError::InsufficientData)?,
        )?;
        Ok(RawDataRecordHeader {
            data_information_block: difb,
            value_information_block: vifb,
        })
    }
}

impl<'a> TryFrom<&RawDataRecordHeader<'a>> for ProcessedDataRecordHeader {
    type Error = DataRecordError;
    fn try_from(raw_data_record_header: &RawDataRecordHeader) -> Result<Self, DataRecordError> {
        let value_information =
            ValueInformation::try_from(&raw_data_record_header.value_information_block)?;
        let mut data_information =
            DataInformation::try_from(&raw_data_record_header.data_information_block)?;

        // unfortunately, the data field coding is not always set in the data information block
        // so we must do some additional checks to determine the correct data field coding

        if value_information.labels.contains(&ValueLabel::Date) {
            data_information.data_field_coding = DataFieldCoding::DateTypeG;
        } else if value_information.labels.contains(&ValueLabel::DateTime) {
            data_information.data_field_coding = DataFieldCoding::DateTimeTypeF;
        } else if value_information.labels.contains(&ValueLabel::Time) {
            data_information.data_field_coding = DataFieldCoding::DateTimeTypeJ;
        } else if value_information
            .labels
            .contains(&ValueLabel::DateTimeWithSeconds)
        {
            data_information.data_field_coding = DataFieldCoding::DateTimeTypeI;
        }
        Ok(Self {
            data_information,
            value_information,
        })
    }
}

impl<'a> TryFrom<&'a [u8]> for DataRecordHeader<'a> {
    type Error = DataRecordError;
    fn try_from(data: &'a [u8]) -> Result<Self, DataRecordError> {
        let raw_data_record_header = RawDataRecordHeader::try_from(data)?;
        let processed_data_record_header =
            ProcessedDataRecordHeader::try_from(&raw_data_record_header)?;
        Ok(Self {
            raw_data_record_header,
            processed_data_record_header,
        })
    }
}

impl<'a> TryFrom<&'a [u8]> for DataRecord<'a> {
    type Error = DataRecordError;
    fn try_from(data: &[u8]) -> Result<DataRecord, DataRecordError> {
        let data_record_header = DataRecordHeader::try_from(data)?;
        let offset = data_record_header
            .raw_data_record_header
            .data_information_block
            .get_size()
            + data_record_header
                .raw_data_record_header
                .value_information_block
                .get_size();
        let data = data_record_header
            .processed_data_record_header
            .data_information
            .data_field_coding
            .parse(
                data.get(offset..)
                    .ok_or(DataRecordError::InsufficientData)?,
            )?;
        Ok(DataRecord {
            data_record_header,
            data,
        })
    }
}

#[cfg(test)]
mod tests {
    use super::*;

    #[test]
    fn test_parse_raw_data_record() {
        let data = &[0x03, 0x13, 0x15, 0x31, 0x00];
        let _result = DataRecordHeader::try_from(data.as_slice());
    }
}