use std::collections::HashSet;
use std::path::PathBuf;
use std::fs::File;
use std::io::Read;
use imf_codec::fragments::header;
use walkdir::WalkDir;


#[test]
#[ignore]
fn test_enron500k() {
    let mut d = PathBuf::from(env!("CARGO_MANIFEST_DIR"));
    d.push("resources/enron/maildir/");
    let prefix_sz = d.as_path().to_str().unwrap().len();
    //d.push("williams-w3/");

    let known_bad_fields = HashSet::from([
        "white-s/calendar/113.", // To: east <7..>
                                         
        "skilling-j/inbox/223.", // From: pep <performance.>
                                         
        "jones-t/all_documents/9806.", // To: <"tibor.vizkelety":@enron.com>
        "jones-t/notes_inbox/3303.", // To: <"tibor.vizkelety":@enron.com>
                                             
        "lokey-t/calendar/33.", // A second Date entry for the calendar containing
                                        // Date:       Monday, March 12
                                        
        "zipper-a/inbox/199.", // To: e-mail <mari.>

        "dasovich-j/deleted_items/128.", // To: f62489 <g>
        "dasovich-j/all_documents/677.", // To: w/assts <govt.>
        "dasovich-j/all_documents/8984.", // To: <"ft.com.users":@enron.com>
        "dasovich-j/all_documents/3514.", // To: <"ft.com.users":@enron.com>
        "dasovich-j/all_documents/4467.", // To: <"ft.com.users":@enron.com>
        "dasovich-j/all_documents/578.", // To: w/assts <govt.>
        "dasovich-j/all_documents/3148.", // To: <"economist.com.readers":@enron.com>
        "dasovich-j/all_documents/9953.", // To: <"economist.com.reader":@enron.com>
        "dasovich-j/risk_analytics/3.", // To: w/assts <govt.>
        "dasovich-j/notes_inbox/5391.", // To: <"ft.com.users":@enron.com>
        "dasovich-j/notes_inbox/4952.", // To: <"economist.com.reader":@enron.com>
        "dasovich-j/notes_inbox/2386.", // To: <"ft.com.users":@enron.com>
        "dasovich-j/notes_inbox/1706.", // To: <"ft.com.users":@enron.com>
        "dasovich-j/notes_inbox/1489.", // To: <"economist.com.readers":@enron.com>
        "dasovich-j/notes_inbox/5.", // To: w/assts <govt.>

        "kaminski-v/sites/19.", // To: <"the.desk":@enron.com>
        "kaminski-v/sites/1.", // To: <"the.desk":@enron.com>
        "kaminski-v/discussion_threads/5082.", // To: <"ft.com.users":@enron.com>
        "kaminski-v/discussion_threads/4046.", // To: <"the.desk":@enron.com>
        "kaminski-v/discussion_threads/4187.", // To: <"the.desk":@enron.com>
        "kaminski-v/discussion_threads/8068.", // To: cats <breaktkhrough.>, risk <breakthrough.>, leaders <breaktkhrough.>
        "kaminski-v/discussion_threads/7980.", // To: dogs <breakthrough.>, cats <breaktkhrough.>, risk <breakthrough.>,\r\n\tleaders <breaktkhrough.>
        "kaminski-v/all_documents/5970.", //To: dogs <breakthrough.>, cats <breaktkhrough.>, risk <breakthrough.>,\r\n\tleaders <breaktkhrough.>
        "kaminski-v/all_documents/5838.", // To + Cc: dogs <breakthrough.>, breakthrough.adm@enron.com, breakthrough.adm@enron.com,\r\n\tbreakthrough.adm@enron.com
        "kaminski-v/all_documents/10070.", // To: <"ft.com.users":@enron.com>
        "kaminski-v/all_documents/92.", // To: <"the.desk":@enron.com>
        "kaminski-v/all_documents/276.", // To: <"the.desk":@enron.com>
        "kaminski-v/technical/1.", // To: <"the.desk":@enron.com>
        "kaminski-v/technical/7.", // To: <"the.desk":@enron.com>
        "kaminski-v/notes_inbox/140.", // To: dogs <breakthrough.>, cats <breaktkhrough.>, risk <breakthrough.>,\r\n\tleaders <breaktkhrough.>
        "kaminski-v/notes_inbox/95.", // To + CC failed: cats <breaktkhrough.>, risk <breakthrough.>, leaders <breaktkhrough.>

        "kean-s/archiving/untitled/1232.", // To: w/assts <govt.>, mark.palmer@enron.com, karen.denne@enron.com
        "kean-s/archiving/untitled/1688.", // To: w/assts <govt.>
        "kean-s/sent/198.", // To: w/assts <govt.>, mark.palmer@enron.com, karen.denne@enron.com
        "kean-s/reg_risk/9.", // To: w/assts <govt.>
        "kean-s/discussion_threads/950.", // To: w/assts <govt.>, mark.palmer@enron.com, karen.denne@enron.com
        "kean-s/discussion_threads/577.", // To: w/assts <govt.>
        "kean-s/calendar/untitled/1096.", // To: w/assts <govt.>, mark.palmer@enron.com, karen.denne@enron.com
        "kean-s/calendar/untitled/640.", // To: w/assts <govt.>
        "kean-s/all_documents/640.", // To: w/assts <govt.>
        "kean-s/all_documents/1095.", // To: w/assts <govt.>
        "kean-s/attachments/2030.",  // To: w/assts <govt.>

        "williams-w3/operations_committee_isas/10.", // To: z34655 <m>
    ]);

    let known_bad_from = HashSet::from([
        "skilling-j/inbox/223.", // From: pep <performance.>
    ]);

    let mut i = 0;
    for entry in WalkDir::new(d.as_path()).into_iter().filter_map(|file| file.ok()) {
        if entry.metadata().unwrap().is_file() {
            let mail_path = entry.path();
            let suffix = &mail_path.to_str().unwrap()[prefix_sz..];

            // read file
            let mut raw = Vec::new();
            let mut f = File::open(mail_path).unwrap();
            f.read_to_end(&mut raw).unwrap();

            // parse
            let (email, encoding, malformed) = header::from_bytes(&raw);
            //println!("Encoding: {:?}, Malformed: {:?}", encoding, malformed);

            let (input, hdrs) = header::section(&email).unwrap();
            //println!("{:?}", hdrs);
            let ok_date = hdrs.date.is_some();
            let ok_from = hdrs.from.len() > 0;
            let ok_fields = hdrs.bad_fields.len() == 0;

            let p = entry.path();
            if !ok_date || !ok_from || !ok_fields {
                println!("Issue with: {}", suffix);
            }

            assert!(ok_date);

            if !known_bad_from.contains(suffix) {
                assert!(ok_from);
            }

            if !known_bad_fields.contains(suffix) {
                assert!(ok_fields);
            }

            i += 1;
            if i % 1000 == 0 {
                println!("Analyzed emails: {}", i);
            }
        } 
    }
}