//! `wai.text.timed` (extensions/timed-text.md): the committed corpus
//! `live-conformance/captions/` regenerates byte for byte from its fixed seeds, holds no
//! other file, every case in it gets the outcome it states, it covers every reason and
//! every 608 code path, and the extension's §12 lists exactly the reasons the reference
//! reports.
#![cfg(feature = "timed_text")]

use std::collections::{BTreeMap, BTreeSet};
use std::path::PathBuf;
use wai::timed_text::{corpus, Reason};

fn wai_dir() -> PathBuf {
    PathBuf::from(env!("CARGO_MANIFEST_DIR")).join("..")
}

fn committed() -> BTreeMap<String, String> {
    let dir = wai_dir().join("live-conformance/captions");
    std::fs::read_dir(&dir)
        .expect("the committed corpus")
        .flatten()
        .map(|e| (e.file_name().to_string_lossy().into_owned(), e.path()))
        .filter(|(n, _)| n != "README.md")
        .map(|(n, p)| (n, std::fs::read_to_string(p).expect("a text file")))
        .collect()
}

#[test]
fn the_committed_corpus_regenerates_from_its_seeds() {
    let files = committed();
    let generated: BTreeMap<String, String> = corpus::generate().into_iter().collect();
    let extra: Vec<&String> = files.keys().filter(|k| !generated.contains_key(*k)).collect();
    let missing: Vec<&String> = generated.keys().filter(|k| !files.contains_key(*k)).collect();
    let differ: Vec<&String> = generated.iter().filter(|(k, v)| files.get(*k).is_some_and(|f| f != *v)).map(|(k, _)| k).collect();
    assert!(extra.is_empty() && missing.is_empty() && differ.is_empty(), "extra {extra:?}, missing {missing:?}, differ {differ:?}: run `wai_timed_text_vectors gen`");
}

#[test]
fn every_case_gets_its_stated_outcome() {
    let fails = corpus::verify(&committed());
    assert!(fails.is_empty(), "{}", fails.join("\n"));
}

/// Every 608 code path §8 uses is in a committed file.
#[test]
fn the_corpus_covers_every_608_path() {
    let mut seen = BTreeSet::new();
    for (name, body) in committed() {
        if name.ends_with(".608.hex") {
            seen.extend(corpus::cc_paths(&body));
        }
    }
    for p in corpus::CC_PATHS {
        assert!(seen.contains(p), "no committed 608 file sends {p}");
    }
}

/// §12 of the extension lists exactly the codes `Reason` has, each once, in order.
#[test]
fn the_extension_lists_the_reasons() {
    let text = std::fs::read_to_string(wai_dir().join("extensions/timed-text.md")).expect("the extension");
    let at = text.find("\n## 12. Reasons").expect("a §12");
    let end = text[at + 1..].find("\n## ").map_or(text.len(), |e| at + 1 + e);
    let listed: Vec<String> =
        text[at..end].lines().filter(|l| l.starts_with("| `")).filter_map(|l| l.split('`').nth(1).map(String::from)).collect();
    let want: Vec<String> = Reason::ALL.iter().map(|r| r.code().to_string()).collect();
    assert_eq!(listed, want, "§12's table and Reason::ALL differ");
}