//! The config file and `spectral init`, driven through the built binary.
//!
//! Precedence is asserted at the command line rather than in a unit test,
//! because `std::env::set_var` is `unsafe` under edition 2024 and this crate
//! allows no `unsafe`: the process under test is the one that sets the
//! variables.

mod common;

use std::path::Path;

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()
}

/// A second kernel tree, so a test can tell two answers apart.
fn other_tree(fixture: &Fixture) -> std::path::PathBuf {
    let tree = fixture.join("other-tree");
    std::fs::create_dir_all(tree.join("scripts")).expect("create the other tree");
    std::fs::write(tree.join("scripts/checkpatch.pl"), "#!/bin/sh\n").expect("write checkpatch");
    std::fs::write(tree.join("scripts/get_maintainer.pl"), "#!/bin/sh\n")
        .expect("write the script");
    std::fs::write(tree.join("MAINTAINERS"), "OTHER DRIVER\n").expect("write MAINTAINERS");

    tree
}

#[test]
fn a_config_file_supplies_the_tree_when_the_environment_does_not() {
    let fixture = Fixture::kernel_tree();
    fixture.write_config(&format!(
        "kernel_tree = \"{}\"\npatch_dir = \"{}\"\n",
        fixture.tree().display(),
        fixture.home().join("patches").display()
    ));

    let output = fixture.cli_without_the_tree_variable(&["doctor"], &[]);

    assert!(
        output.status.success(),
        "{}{}",
        stdout_of(&output),
        stderr_of(&output)
    );
    let stdout = stdout_of(&output);
    assert!(stdout.contains("ok   kernel tree"), "{stdout}");
    assert!(
        stdout.contains("from the config file"),
        "the report says the file answered: {stdout}"
    );
    assert!(
        stdout.contains("ok   config file"),
        "the file is a check of its own: {stdout}"
    );
}

#[test]
fn the_environment_beats_the_config_file() {
    let fixture = Fixture::kernel_tree();
    fixture.write_config(&format!(
        "kernel_tree = \"{}\"\n",
        other_tree(&fixture).display()
    ));

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

    assert!(output.status.success(), "{}", stdout_of(&output));
    let stdout = stdout_of(&output);
    assert!(stdout.contains("from $SPECTRAL_KERNEL"), "{stdout}");
    assert!(
        stdout.contains(fixture.tree().to_str().expect("the tree")),
        "{stdout}"
    );
}

#[test]
fn the_file_beats_the_built_in_default() {
    let fixture = Fixture::kernel_tree();
    let other = other_tree(&fixture);
    fixture.write_config(&format!("kernel_tree = \"{}\"\n", other.display()));

    let output = fixture.cli_without_the_tree_variable(&["doctor"], &[]);

    assert!(output.status.success(), "{}", stdout_of(&output));
    let stdout = stdout_of(&output);
    assert!(
        stdout.contains(other.to_str().expect("the other tree")),
        "the file's tree is the one doctor looked at: {stdout}"
    );
    assert!(
        !stdout.contains(".spectral/linux"),
        "the default was not used: {stdout}"
    );
}

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

    let output = fixture.cli_without_the_tree_variable(&["doctor"], &[]);

    assert_eq!(output.status.code(), Some(1));
    let stdout = stdout_of(&output);
    assert!(
        stdout.contains(".spectral/linux"),
        "the default is $HOME/.spectral/linux: {stdout}"
    );
    assert!(stdout.contains("the built-in default"), "{stdout}");
}

#[test]
fn malformed_config_is_a_named_error_rather_than_a_panic() {
    let fixture = Fixture::kernel_tree();
    let path = fixture.write_config("kernel_tree = 42\n");

    let output = fixture.cli_without_the_tree_variable(&["doctor"], &[]);

    assert_eq!(
        output.status.code(),
        Some(1),
        "a bad config is not a panic: {}{}",
        stdout_of(&output),
        stderr_of(&output)
    );
    let stderr = stderr_of(&output);
    assert!(stderr.contains("is not a readable config file"), "{stderr}");
    assert!(stderr.contains(&path.display().to_string()), "{stderr}");
}

#[test]
fn an_unknown_key_is_refused_rather_than_ignored() {
    let fixture = Fixture::kernel_tree();
    fixture.write_config(&format!(
        "kernel_tree = \"{}\"\ntree = \"a typo\"\n",
        fixture.tree().display()
    ));

    let output = fixture.cli_without_the_tree_variable(&["doctor"], &[]);

    assert_eq!(output.status.code(), Some(1));
    assert!(
        stderr_of(&output).contains("is not a readable config file"),
        "{}",
        stderr_of(&output)
    );
}

#[test]
fn a_relative_path_in_the_config_is_refused() {
    let fixture = Fixture::kernel_tree();
    fixture.write_config("kernel_tree = \"linux\"\n");

    let output = fixture.cli_without_the_tree_variable(&["doctor"], &[]);

    assert_eq!(output.status.code(), Some(1));
    let stderr = stderr_of(&output);
    assert!(stderr.contains("not an absolute path"), "{stderr}");
}

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

    let first = fixture.cli_without_the_tree_variable(
        &["init", "--tree", fixture.tree().to_str().expect("the tree")],
        &[],
    );
    assert!(
        first.status.success(),
        "{}{}",
        stdout_of(&first),
        stderr_of(&first)
    );
    assert!(stdout_of(&first).contains("wrote"), "{}", stdout_of(&first));
    let config = fixture.home().join("config/spectral/config.toml");
    let written = std::fs::read(&config).expect("the config file");
    assert!(
        String::from_utf8_lossy(&written).contains(fixture.tree().to_str().expect("the tree")),
        "{}",
        String::from_utf8_lossy(&written)
    );

    let second = fixture.cli_without_the_tree_variable(
        &["init", "--tree", fixture.tree().to_str().expect("the tree")],
        &[],
    );
    assert!(second.status.success(), "{}", stderr_of(&second));
    assert!(
        stdout_of(&second).contains("already says this"),
        "{}",
        stdout_of(&second)
    );
    assert_eq!(
        std::fs::read(&config).expect("the config file"),
        written,
        "the second run rewrote the file"
    );
}

#[test]
fn init_refuses_to_clobber_a_config_that_says_something_else() {
    let fixture = Fixture::kernel_tree();
    let other = other_tree(&fixture);
    fixture.write_config(&format!("kernel_tree = \"{}\"\n", other.display()));

    let refused = fixture.cli_without_the_tree_variable(
        &["init", "--tree", fixture.tree().to_str().expect("the tree")],
        &[],
    );
    assert_eq!(refused.status.code(), Some(1));
    let stderr = stderr_of(&refused);
    assert!(stderr.contains("already points somewhere else"), "{stderr}");
    assert!(stderr.contains("--force"), "{stderr}");

    let forced = fixture.cli_without_the_tree_variable(
        &[
            "init",
            "--tree",
            fixture.tree().to_str().expect("the tree"),
            "--force",
        ],
        &[],
    );
    assert!(
        forced.status.success(),
        "{}{}",
        stdout_of(&forced),
        stderr_of(&forced)
    );
    let config = std::fs::read_to_string(fixture.home().join("config/spectral/config.toml"))
        .expect("the config file");
    assert!(
        config.contains(fixture.tree().to_str().expect("the tree")),
        "{config}"
    );
}

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

    let output = fixture.cli_without_the_tree_variable(
        &[
            "init",
            "--tree",
            not_a_tree.to_str().expect("the directory"),
        ],
        &[],
    );

    assert_eq!(output.status.code(), Some(1));
    assert!(
        stderr_of(&output).contains("not a kernel source tree"),
        "{}",
        stderr_of(&output)
    );
    assert!(
        !Path::new(&fixture.home().join("config/spectral/config.toml")).exists(),
        "a tree that did not verify must not be written into the config"
    );
}

#[test]
fn init_refuses_before_it_clones_anything() {
    // The refusal is about the config file, so it has to happen before a
    // multi-minute kernel clone rather than after one has already landed.
    let fixture = Fixture::kernel_tree();
    let other = other_tree(&fixture);
    fixture.write_config(&format!("kernel_tree = \"{}\"\n", other.display()));
    let into = fixture.home().join("should-not-exist");

    let output = fixture.cli_without_the_tree_variable(
        &[
            "init",
            "--clone",
            fixture.tree().to_str().expect("the tree"),
            "--tree",
            into.to_str().expect("the destination"),
        ],
        &[],
    );

    assert_eq!(output.status.code(), Some(1));
    assert!(
        stderr_of(&output).contains("already points somewhere else"),
        "{}",
        stderr_of(&output)
    );
    assert!(
        !into.exists(),
        "the clone ran before the refusal was printed"
    );
}

#[test]
fn init_clones_a_tree_it_was_given_a_url_for() {
    // A local path is a url git can clone, so this exercises the clone branch
    // without a network.
    let fixture = Fixture::kernel_tree();
    let into = fixture.home().join("cloned");

    let output = fixture.cli_without_the_tree_variable(
        &[
            "init",
            "--clone",
            fixture.tree().to_str().expect("the tree"),
            "--tree",
            into.to_str().expect("the destination"),
        ],
        &[],
    );

    assert!(
        output.status.success(),
        "{}{}",
        stdout_of(&output),
        stderr_of(&output)
    );
    assert!(into.join("scripts/checkpatch.pl").is_file());
    assert!(into.join("MAINTAINERS").is_file());
    let config = std::fs::read_to_string(fixture.home().join("config/spectral/config.toml"))
        .expect("the config file");
    assert!(config.contains("cloned"), "{config}");
}

#[test]
fn the_config_file_carries_always_cc_and_an_identity_into_submit() {
    let fixture = Fixture::kernel_tree();
    fixture.work_on_a_branch();
    fixture.write("drivers/foo/bar.c", common::EDITED);
    fixture.commit_all("foo: return a + 1");
    assert!(
        fixture
            .cli(&["patch", "create", "000-foo"])
            .status
            .success()
    );
    fixture.write_config(&format!(
        "kernel_tree = \"{}\"\nalways_cc = [\"watcher@example.com\"]\n\n[send_email]\nfrom = \"Someone <someone@example.com>\"\n",
        fixture.tree().display()
    ));

    let output = fixture
        .cli_without_the_tree_variable(&["patch", "submit", "000-foo.patch", "--dry-run"], &[]);

    assert!(
        output.status.success(),
        "{}{}",
        stdout_of(&output),
        stderr_of(&output)
    );
    let stdout = stdout_of(&output);
    assert!(stdout.contains("Cc: watcher@example.com"), "{stdout}");
    assert!(
        stdout.contains("--from 'Someone <someone@example.com>'"),
        "{stdout}"
    );
    assert!(stdout.contains("Dry-OK"), "{stdout}");
}