edi 0.4.0

Parser for X12 EDI files
Documentation 
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use edi::parse;

#[test]
fn test_empty_document() {
    let result = parse("");
    assert!(result.is_err());
    // Simply check that parsing empty string returns an error
}

#[test]
fn test_document_with_only_isa() {
    let input = "ISA*00*          *00*          *ZZ*SENDER         *ZZ*RECEIVER       *200301*1253*U*00401*000000001*0*T*>~";
    let result = parse(input);
    // This should parse but may have validation issues if strict mode expects closing segments
    assert!(result.is_ok() || result.is_err());
}

#[test]
fn test_minimal_valid_document() {
    let input = "ISA*00*          *00*          *ZZ*SENDER         *ZZ*RECEIVER       *200301*1253*U*00401*000000001*0*T*>~
GS*PO*SENDER*RECEIVER*20200301*1253*1*X*004010~
ST*850*0001~
SE*2*0001~
GE*1*1~
IEA*1*000000001~";

    let result = parse(input);
    assert!(result.is_ok());
    let doc = result.unwrap();
    assert_eq!(doc.interchanges.len(), 1);
    assert_eq!(doc.interchanges[0].functional_groups.len(), 1);
    assert_eq!(
        doc.interchanges[0].functional_groups[0].transactions.len(),
        1
    );
}

#[test]
fn test_newline_as_segment_delimiter() {
    let input = "ISA*00*          *00*          *ZZ*SENDER         *ZZ*RECEIVER       *200301*1253*U*00401*000000001*0*T*>
GS*PO*SENDER*RECEIVER*20200301*1253*1*X*004010
ST*850*0001
BEG*00*SA*PO123**20200301
SE*3*0001
GE*1*1
IEA*1*000000001";

    let result = parse(input);
    assert!(result.is_ok());
    let doc = result.unwrap();
    assert_eq!(doc.segment_delimiter, '\n');
}

#[test]
fn test_carriage_return_line_feed_delimiter() {
    let input = "ISA*00*          *00*          *ZZ*SENDER         *ZZ*RECEIVER       *200301*1253*U*00401*000000001*0*T*>\r\nGS*PO*SENDER*RECEIVER*20200301*1253*1*X*004010\r\nST*850*0001\r\nBEG*00*SA*PO123**20200301\r\nSE*3*0001\r\nGE*1*1\r\nIEA*1*000000001";

    let result = parse(input);
    // Note: The parser may handle \r\n differently - this tests its behavior
    assert!(result.is_ok() || result.is_err());
}

#[test]
fn test_special_characters_in_data() {
    let input = "ISA*00*          *00*          *ZZ*SENDER-123     *ZZ*RECEIVER.456   *200301*1253*U*00401*000000001*0*T*>~
GS*PO*SENDER-123*RECEIVER.456*20200301*1253*1*X*004010~
ST*850*0001~
BEG*00*SA*PO#123-ABC**20200301~
N1*BT*Company & Sons*9*1223334444~
N3*123 Main St. #456~
N4*NEW YORK*NY*10001~
SE*6*0001~
GE*1*1~
IEA*1*000000001~";

    let result = parse(input);
    assert!(result.is_ok());
    let doc = result.unwrap();

    // Verify special characters are preserved
    let n1_segment = &doc.interchanges[0].functional_groups[0].transactions[0].segments[1];
    assert!(n1_segment.elements[1].contains("Company & Sons"));
}

#[test]
fn test_empty_elements() {
    let input = "ISA*00*          *00*          *ZZ*SENDER         *ZZ*RECEIVER       *200301*1253*U*00401*000000001*0*T*>~
GS*PO*SENDER*RECEIVER*20200301*1253*1*X*004010~
ST*850*0001~
BEG*00*SA***20200301~
REF***~
ITD*****~
SE*5*0001~
GE*1*1~
IEA*1*000000001~";

    let result = parse(input);
    assert!(result.is_ok());
    let doc = result.unwrap();

    // Check that empty elements are preserved
    let beg = &doc.interchanges[0].functional_groups[0].transactions[0].segments[0];
    assert_eq!(beg.elements[2], "");
    assert_eq!(beg.elements[3], "");
}

#[test]
fn test_very_long_segment() {
    let long_data = "X".repeat(1000);
    let input = format!(
        "ISA*00*          *00*          *ZZ*SENDER         *ZZ*RECEIVER       *200301*1253*U*00401*000000001*0*T*>~
GS*PO*SENDER*RECEIVER*20200301*1253*1*X*004010~
ST*850*0001~
BEG*00*SA*{}**20200301~
SE*3*0001~
GE*1*1~
IEA*1*000000001~",
        long_data
    );

    let result = parse(&input);
    assert!(result.is_ok());
    let doc = result.unwrap();

    let beg = &doc.interchanges[0].functional_groups[0].transactions[0].segments[0];
    assert_eq!(beg.elements[2].len(), 1000);
}

#[test]
fn test_unicode_characters() {
    // Some EDI systems may support Unicode, though traditional X12 is ASCII
    let input = "ISA*00*          *00*          *ZZ*SENDER         *ZZ*RECEIVER       *200301*1253*U*00401*000000001*0*T*>~
GS*PO*SENDER*RECEIVER*20200301*1253*1*X*004010~
ST*850*0001~
N1*BT*Société Générale*9*1223334444~
N3*Straße 123~
N4*MÜNCHEN*BY*80331~
SE*5*0001~
GE*1*1~
IEA*1*000000001~";

    let result = parse(input);
    assert!(result.is_ok());
    let doc = result.unwrap();

    let n1 = &doc.interchanges[0].functional_groups[0].transactions[0].segments[0];
    assert!(n1.elements[1].contains("Société"));
}

#[test]
fn test_whitespace_preservation() {
    let input = "ISA*00*          *00*          *ZZ*SENDER         *ZZ*RECEIVER       *200301*1253*U*00401*000000001*0*T*>~
GS*PO*SENDER*RECEIVER*20200301*1253*1*X*004010~
ST*850*0001~
BEG*00*SA*  SPACES  **20200301~
SE*3*0001~
GE*1*1~
IEA*1*000000001~";

    let result = parse(input);
    assert!(result.is_ok());
    let doc = result.unwrap();

    let beg = &doc.interchanges[0].functional_groups[0].transactions[0].segments[0];
    // Note: The parser trims whitespace from elements
    assert_eq!(beg.elements[2], "SPACES");
}

#[test]
fn test_multiple_transactions_in_group() {
    let input = "ISA*00*          *00*          *ZZ*SENDER         *ZZ*RECEIVER       *200301*1253*U*00401*000000001*0*T*>~
GS*PO*SENDER*RECEIVER*20200301*1253*1*X*004010~
ST*850*0001~
BEG*00*SA*PO001**20200301~
SE*3*0001~
ST*850*0002~
BEG*00*SA*PO002**20200301~
SE*3*0002~
ST*850*0003~
BEG*00*SA*PO003**20200301~
SE*3*0003~
GE*3*1~
IEA*1*000000001~";

    let result = parse(input);
    assert!(result.is_ok());
    let doc = result.unwrap();

    assert_eq!(
        doc.interchanges[0].functional_groups[0].transactions.len(),
        3
    );

    // Verify each transaction has correct control number
    let trans1 = &doc.interchanges[0].functional_groups[0].transactions[0];
    assert_eq!(trans1.transaction_set_control_number, "0001");

    let trans2 = &doc.interchanges[0].functional_groups[0].transactions[1];
    assert_eq!(trans2.transaction_set_control_number, "0002");

    let trans3 = &doc.interchanges[0].functional_groups[0].transactions[2];
    assert_eq!(trans3.transaction_set_control_number, "0003");
}

#[test]
fn test_different_transaction_types() {
    let input = "ISA*00*          *00*          *ZZ*SENDER         *ZZ*RECEIVER       *200301*1253*U*00401*000000001*0*T*>~
GS*PO*SENDER*RECEIVER*20200301*1253*1*X*004010~
ST*850*0001~
BEG*00*SA*PO123**20200301~
SE*3*0001~
ST*810*0002~
BIG*20200301*INV123*20200301*PO123~
SE*3*0002~
ST*856*0003~
BSN*00*SH123*20200301*1200~
SE*3*0003~
GE*3*1~
IEA*1*000000001~";

    let result = parse(input);
    assert!(result.is_ok());
    let doc = result.unwrap();

    let trans = &doc.interchanges[0].functional_groups[0].transactions;
    assert_eq!(trans[0].transaction_code, "850");
    assert_eq!(trans[0].transaction_name, "Purchase Order");
    assert_eq!(trans[1].transaction_code, "810");
    assert_eq!(trans[1].transaction_name, "Invoice");
    assert_eq!(trans[2].transaction_code, "856");
    assert_eq!(trans[2].transaction_name, "Ship Notice/Manifest");
}