//! Every `run:` block in a Gitea workflow must be valid shell.
//!
//! Runs 491 through 496 all failed on a single apostrophe. A comment inside a
//! `sh -c '…'` block read `cm-api's vm_tool_gate`, which closed the quote, and
//! the step died with "unexpected EOF while looking for matching quote" —
//! *before running anything*, which is why no log ever appeared and why three
//! separate theories were floated to explain it.
//!
//! The cost was entirely diagnostic: the workflow is not compiled, not linted,
//! and its only feedback is a red build with a log this deployment cannot read.
//! `bash -n` answers it in milliseconds, so the check belongs where it runs
//! before the push rather than after.
//!
//! Skips silently if `bash` is unavailable. The test exists to catch a mistake,
//! not to fail a machine for lacking a shell it probably has.

use std::process::Command;

fn repo_root() -> std::path::PathBuf {
    std::path::Path::new(env!("CARGO_MANIFEST_DIR"))
        .join("../..")
        .canonicalize()
        .expect("repo root")
}

/// Every `run: |` block, as (file, first line number, script).
///
/// Line-based rather than a YAML parse: the workspace has no YAML dependency,
/// and a block scalar's rule — "the body is the lines indented deeper than the
/// key" — is simple enough to apply directly.
fn run_blocks(text: &str, file: &str) -> Vec<(String, usize, String)> {
    let lines: Vec<&str> = text.lines().collect();
    let mut out = Vec::new();
    let mut i = 0;
    while i < lines.len() {
        let line = lines[i];
        let trimmed = line.trim_start();
        if trimmed.starts_with("run:") && trimmed.trim_end().ends_with('|') {
            let key_indent = line.len() - trimmed.len();
            let mut body: Vec<&str> = Vec::new();
            let mut j = i + 1;
            let mut body_indent = usize::MAX;
            while j < lines.len() {
                let l = lines[j];
                if l.trim().is_empty() {
                    body.push("");
                    j += 1;
                    continue;
                }
                let ind = l.len() - l.trim_start().len();
                if ind <= key_indent {
                    break;
                }
                body_indent = body_indent.min(ind);
                body.push(l);
                j += 1;
            }
            let script = body
                .iter()
                .map(|l| {
                    if l.len() >= body_indent {
                        &l[body_indent..]
                    } else {
                        ""
                    }
                })
                .collect::<Vec<_>>()
                .join("\n");
            out.push((file.to_string(), i + 1, script));
            i = j;
            continue;
        }
        i += 1;
    }
    out
}

#[test]
fn every_workflow_run_block_is_valid_shell() {
    if Command::new("bash").arg("-c").arg("true").status().is_err() {
        eprintln!("bash unavailable — skipping workflow shell syntax check");
        return;
    }
    let dir = repo_root().join(".gitea/workflows");
    let entries = std::fs::read_dir(&dir).expect("workflows dir");

    let mut checked = 0usize;
    let mut broken: Vec<String> = Vec::new();
    for e in entries {
        let path = e.expect("entry").path();
        if path.extension().and_then(|x| x.to_str()) != Some("yml") {
            continue;
        }
        let name = path.file_name().unwrap().to_string_lossy().to_string();
        let text = std::fs::read_to_string(&path).expect("read workflow");
        for (file, line, script) in run_blocks(&text, &name) {
            // `${{ … }}` is Gitea's, not the shell's. Substituted with a
            // placeholder so its braces do not read as shell syntax — the point
            // is to catch OUR quoting, not to evaluate their templating.
            let mut cleaned = String::new();
            let mut rest = script.as_str();
            while let Some(start) = rest.find("${{") {
                cleaned.push_str(&rest[..start]);
                cleaned.push_str("PLACEHOLDER");
                rest = match rest[start..].find("}}") {
                    Some(end) => &rest[start + end + 2..],
                    None => "",
                };
            }
            cleaned.push_str(rest);

            let tmp = std::env::temp_dir().join(format!(
                "cm-wf-{}-{}-{}.sh",
                std::process::id(),
                file.replace('.', "_"),
                line
            ));
            std::fs::write(&tmp, &cleaned).expect("write temp script");
            let out = Command::new("bash")
                .arg("-n")
                .arg(&tmp)
                .output()
                .expect("run bash -n");
            let _ = std::fs::remove_file(&tmp);
            checked += 1;
            if !out.status.success() {
                broken.push(format!(
                    "{file}:{line} — {}",
                    String::from_utf8_lossy(&out.stderr).trim()
                ));
            }
        }
    }

    assert!(checked > 0, "found no run: blocks — the extractor is broken, \
                          which would make this test pass forever");
    assert!(
        broken.is_empty(),
        "{} workflow shell block(s) will not parse. The step dies before it \
         runs anything, so CI reports a failure with an empty log:\n  {}",
        broken.len(),
        broken.join("\n  ")
    );
}