//! `spectral doctor`, driven through the built binary.
//!
//! The fixture controls `PATH` and git's configuration, so a missing qemu, a
//! missing sender identity and a tree that is not a kernel tree are produced on
//! purpose rather than inherited from whichever machine this runs on. That
//! extends to git's own send-email support, which the harness cannot control
//! through git's configuration: a `git` wrapper answers for it in both
//! directions, so a host without it still passes.
//!
//! Every test name here carries the verb, so the plan's own command
//! `cargo test --locked doctor` selects exactly this file's tests.

mod common;

use common::Fixture;

fn stdout_of(output: &std::process::Output) -> String {
    String::from_utf8_lossy(&output.stdout).into_owned()
}

fn stderr_of(output: &std::process::Output) -> String {
    String::from_utf8_lossy(&output.stderr).into_owned()
}

/// Run `doctor` with a `git` that has send-email support, whatever the host has.
fn doctor_with_send_email(fixture: &Fixture) -> std::process::Output {
    let bin = fixture.path_with_send_email(0);

    fixture.cli_env(
        &["doctor"],
        &[("PATH", bin.to_str().expect("the git bin directory"))],
    )
}

#[test]
fn doctor_passes_on_a_complete_fixture_tree() {
    let fixture = Fixture::kernel_tree();

    let output = doctor_with_send_email(&fixture);

    assert!(
        output.status.success(),
        "{}{}",
        stdout_of(&output),
        stderr_of(&output)
    );
    let stdout = stdout_of(&output);
    assert!(!stdout.contains("fail "), "{stdout}");
    assert!(stdout.contains("ok   kernel tree"), "{stdout}");
    assert!(
        stdout.contains("from $SPECTRAL_KERNEL"),
        "the report has to say which knob set the path: {stdout}"
    );
    assert!(stdout.contains("ok   git send-email"), "{stdout}");
    assert!(
        stdout.contains("nothing failed") || stdout.contains("everything checked out"),
        "{stdout}"
    );
}

#[test]
fn doctor_names_the_first_hard_failure_when_the_tree_is_missing() {
    let fixture = Fixture::bare();

    let output = fixture.cli_env(&["doctor"], &[("SPECTRAL_KERNEL", "/nonexistent/linux")]);

    assert_eq!(output.status.code(), Some(1));
    let stdout = stdout_of(&output);
    assert!(stdout.contains("fail kernel tree"), "{stdout}");
    assert!(stdout.contains("first failure: kernel tree"), "{stdout}");
    assert!(
        stdout.contains("skip checkpatch.pl"),
        "the checks that need a tree are not answers when there is none: {stdout}"
    );
    assert!(stdout.contains("-> "), "the fix hint is printed: {stdout}");
}

#[test]
fn doctor_names_a_directory_that_is_not_a_kernel_tree() {
    let fixture = Fixture::bare();
    let tree = fixture.join("not-a-tree");
    std::fs::create_dir_all(&tree).expect("create the directory");

    let output = fixture.cli_env(
        &["doctor"],
        &[("SPECTRAL_KERNEL", tree.to_str().expect("the tree path"))],
    );

    assert_eq!(output.status.code(), Some(1));
    let stdout = stdout_of(&output);
    assert!(stdout.contains("fail kernel tree shape"), "{stdout}");
    assert!(stdout.contains("not a kernel source tree"), "{stdout}");
    assert!(
        stdout.contains("first failure: kernel tree shape"),
        "{stdout}"
    );
}

#[test]
fn doctor_warns_about_qemu_off_the_path_rather_than_failing() {
    let fixture = Fixture::kernel_tree();
    // A `PATH` holding the git wrapper and nothing else: qemu is gone, the
    // rest is not.
    let bin = fixture.path_with_send_email(0);

    let output = fixture.cli_env(
        &["doctor"],
        &[("PATH", bin.to_str().expect("the git bin directory"))],
    );

    assert!(
        output.status.success(),
        "{}{}",
        stdout_of(&output),
        stderr_of(&output)
    );
    let stdout = stdout_of(&output);
    assert!(stdout.contains("warn qemu"), "{stdout}");
    assert!(
        !stdout.contains("fail "),
        "a missing qemu is not something the loop cannot work around: {stdout}"
    );
}

#[test]
fn doctor_fails_on_no_sender_identity_and_says_how_to_fix_it() {
    let fixture = Fixture::kernel_tree();
    // Both places git would find one: the tree's own config and the fixture's
    // global one.
    fixture.git(&["config", "--unset", "user.email"]);
    std::fs::write(
        fixture.home().join("gitconfig"),
        "[core]\n\trepositoryformatversion = 0\n",
    )
    .expect("write a global config with no identity");

    let output = doctor_with_send_email(&fixture);

    assert_eq!(output.status.code(), Some(1));
    let stdout = stdout_of(&output);
    assert!(stdout.contains("fail sender identity"), "{stdout}");
    assert!(
        stdout.contains("user.email"),
        "the failure says how to fix it: {stdout}"
    );
    assert!(
        stdout.contains("first failure: sender identity"),
        "{stdout}"
    );
}

#[test]
fn doctor_warns_when_git_has_no_send_email_support() {
    // The direction the host cannot be trusted for: this machine has it, and a
    // machine without it must fail the same way rather than pass by accident.
    let fixture = Fixture::kernel_tree();
    let bin = fixture.path_with_send_email(1);

    let output = fixture.cli_env(
        &["doctor"],
        &[("PATH", bin.to_str().expect("the git bin directory"))],
    );

    assert_eq!(output.status.code(), Some(1));
    let stdout = stdout_of(&output);
    assert!(stdout.contains("fail git send-email"), "{stdout}");
    assert!(stdout.contains("first failure: git send-email"), "{stdout}");
}

#[test]
fn doctor_warns_about_no_mail_route_because_dry_runs_are_what_matter() {
    // The fixture's git config has no sendemail.* at all, which is the state
    // this machine's own config was in when --dry-run was verified.
    let fixture = Fixture::kernel_tree();

    let output = doctor_with_send_email(&fixture);

    assert!(output.status.success());
    let stdout = stdout_of(&output);
    assert!(stdout.contains("warn mail route"), "{stdout}");
    assert!(
        stdout.contains("--dry-run works"),
        "the warning says what still works: {stdout}"
    );
}

#[test]
fn doctor_reports_where_the_paths_came_from() {
    let fixture = Fixture::kernel_tree();
    let patches = fixture.home().join("patches");

    let output = fixture.cli_env(
        &["doctor"],
        &[
            (
                "PATH",
                fixture.path_with_send_email(0).to_str().expect("the bin"),
            ),
            (
                "SPECTRAL_PATCH_DIR",
                patches.to_str().expect("the patch dir"),
            ),
        ],
    );

    let stdout = stdout_of(&output);
    assert!(stdout.contains("from $SPECTRAL_PATCH_DIR"), "{stdout}");
    assert!(
        stdout.contains(patches.to_str().expect("the patch dir")),
        "{stdout}"
    );
    assert!(
        patches.is_dir(),
        "doctor is the one check with a side effect: it makes the directory it was pointed at"
    );
}