#![cfg(unix)]

use sha2::{Digest, Sha256};
use std::fs;
use std::os::unix::fs::PermissionsExt;
use std::path::{Path, PathBuf};
use std::process::Command;
use tempfile::TempDir;

const VERSION: &str = "9.8.7-rc3";

fn write_executable(path: &Path, body: &str) {
    fs::write(path, body).unwrap();
    let mut permissions = fs::metadata(path).unwrap().permissions();
    permissions.set_mode(0o755);
    fs::set_permissions(path, permissions).unwrap();
}

struct InstallerFixture {
    root: TempDir,
    fake_bin: PathBuf,
    archive: PathBuf,
    checksum: PathBuf,
    curl_log: PathBuf,
    git_log: PathBuf,
    version: String,
}

impl InstallerFixture {
    fn new(version: &str) -> Self {
        let root = tempfile::tempdir().unwrap();
        let fake_bin = root.path().join("fake-bin");
        let stage = root.path().join("stage/dosh");
        fs::create_dir_all(fake_bin.as_path()).unwrap();
        fs::create_dir_all(stage.join("bin")).unwrap();
        fs::write(stage.join("VERSION"), format!("{version}\n")).unwrap();
        write_executable(
            &stage.join("bin/dosh-client"),
            "#!/bin/sh\nprintf 'fixture dosh\\n'\n",
        );

        let archive = root.path().join("dosh-macos-aarch64.tar.gz");
        let status = Command::new("tar")
            .args(["-C", root.path().join("stage").to_str().unwrap(), "-czf"])
            .arg(&archive)
            .arg("dosh")
            .status()
            .unwrap();
        assert!(status.success());
        let digest = Sha256::digest(fs::read(&archive).unwrap());
        let checksum = root.path().join("dosh-macos-aarch64.tar.gz.sha256");
        fs::write(
            &checksum,
            format!("{digest:x}  dosh-macos-aarch64.tar.gz\n"),
        )
        .unwrap();

        write_executable(
            &fake_bin.join("uname"),
            "#!/bin/sh\ncase \"${1:-}\" in -s) echo Darwin;; -m) echo arm64;; *) echo Darwin;; esac\n",
        );
        let curl_log = root.path().join("curl.log");
        let git_log = root.path().join("git.log");
        write_executable(
            &fake_bin.join("curl"),
            r#"#!/bin/sh
printf '%s\n' "$*" >>"$TEST_CURL_LOG"
out=
previous=
url=
for arg in "$@"; do
  if [ "$previous" = "-o" ]; then out="$arg"; fi
  previous="$arg"
  case "$arg" in http://*|https://*) url="$arg";; esac
done
case "$url" in
  */raw/branch/main/Cargo.toml)
    printf '[package]\nname = "dosh"\nversion = "%s"\n' "$TEST_RELEASE_VERSION"
    ;;
  *.sha256)
    cp "$TEST_ARCHIVE_CHECKSUM" "$out"
    ;;
  */releases/download/*)
    [ "${TEST_FAIL_ARCHIVE:-0}" = 1 ] && exit 22
    cp "$TEST_ARCHIVE" "$out"
    ;;
  *) exit 22;;
esac
"#,
        );

        Self {
            root,
            fake_bin,
            archive,
            checksum,
            curl_log,
            git_log,
            version: version.to_string(),
        }
    }

    fn command(&self, cwd: &Path) -> Command {
        let mut command = Command::new("sh");
        command
            .arg(format!("{}/install.sh", env!("CARGO_MANIFEST_DIR")))
            .args([
                "client",
                "--repo",
                "https://example.invalid/Palav/dosh.git",
                "--prefix",
            ])
            .arg(self.root.path().join("prefix"))
            .current_dir(cwd)
            .env("HOME", self.root.path().join("home"))
            .env(
                "PATH",
                format!(
                    "{}:{}",
                    self.fake_bin.display(),
                    std::env::var("PATH").unwrap_or_default()
                ),
            )
            .env("DOSH_BINARY_REQUIRED", "1")
            .env("TEST_RELEASE_VERSION", &self.version)
            .env("TEST_ARCHIVE", &self.archive)
            .env("TEST_ARCHIVE_CHECKSUM", &self.checksum)
            .env("TEST_CURL_LOG", &self.curl_log)
            .env("TEST_GIT_LOG", &self.git_log);
        command
    }

    fn installed_client(&self) -> PathBuf {
        self.root.path().join("prefix/bin/dosh-client")
    }
}

#[test]
fn unix_installer_uses_repository_version_even_inside_an_unrelated_rust_project() {
    let fixture = InstallerFixture::new(VERSION);
    let unrelated = fixture.root.path().join("unrelated");
    fs::create_dir_all(&unrelated).unwrap();
    fs::write(
        unrelated.join("Cargo.toml"),
        "[package]\nname = \"not-dosh\"\nversion = \"99.0.0\"\n",
    )
    .unwrap();

    let output = fixture.command(&unrelated).output().unwrap();
    assert!(
        output.status.success(),
        "installer failed: {}",
        String::from_utf8_lossy(&output.stderr)
    );
    assert!(fixture.installed_client().is_file());
    let requests = fs::read_to_string(&fixture.curl_log).unwrap();
    assert!(requests.contains("/raw/branch/main/Cargo.toml"));
    assert!(requests.contains(&format!(
        "/releases/download/v{VERSION}/dosh-macos-aarch64.tar.gz"
    )));
    assert!(!requests.contains("/releases/latest"));
    assert!(!requests.contains("99.0.0"));
}

#[test]
fn unix_installer_source_fallback_checks_out_the_same_release_tag() {
    let fixture = InstallerFixture::new(VERSION);
    write_executable(
        &fixture.fake_bin.join("git"),
        r#"#!/bin/sh
printf '%s\n' "$*" >>"$TEST_GIT_LOG"
if [ "${1:-}" = clone ]; then
  for destination in "$@"; do :; done
  mkdir -p "$destination/.git"
fi
"#,
    );
    write_executable(
        &fixture.fake_bin.join("cargo"),
        "#!/bin/sh\nmkdir -p target/release\nprintf '#!/bin/sh\\n' >target/release/dosh-client\nchmod +x target/release/dosh-client\n",
    );
    let cwd = fixture.root.path().join("plain");
    fs::create_dir_all(&cwd).unwrap();
    let mut command = fixture.command(&cwd);
    command
        .env("DOSH_BINARY_REQUIRED", "0")
        .env("TEST_FAIL_ARCHIVE", "1");

    let output = command.output().unwrap();
    assert!(
        output.status.success(),
        "installer failed: {}",
        String::from_utf8_lossy(&output.stderr)
    );
    assert!(fixture.installed_client().is_file());
    let git = fs::read_to_string(&fixture.git_log).unwrap();
    assert!(git.contains(&format!("clone --depth 1 --branch v{VERSION}")));
    assert!(!git.contains("--branch main"));
}

#[test]
fn unix_installer_resolves_a_stable_repository_version_without_latest_redirects() {
    let version = "1.2.3";
    let fixture = InstallerFixture::new(version);
    let cwd = fixture.root.path().join("plain");
    fs::create_dir_all(&cwd).unwrap();

    let output = fixture.command(&cwd).output().unwrap();
    assert!(
        output.status.success(),
        "installer failed: {}",
        String::from_utf8_lossy(&output.stderr)
    );
    let requests = fs::read_to_string(&fixture.curl_log).unwrap();
    assert!(requests.contains(&format!(
        "/releases/download/v{version}/dosh-macos-aarch64.tar.gz"
    )));
    assert!(!requests.contains("/releases/latest"));
}

#[test]
fn unix_installer_repairs_a_legacy_updater_that_requests_its_old_tag() {
    let fixture = InstallerFixture::new(VERSION);
    let cwd = fixture.root.path().join("plain");
    fs::create_dir_all(&cwd).unwrap();
    let mut command = fixture.command(&cwd);
    command.env("DOSH_BINARY_VERSION", "v0.1.17");

    let output = command.output().unwrap();
    assert!(
        output.status.success(),
        "installer failed: {}",
        String::from_utf8_lossy(&output.stderr)
    );
    let requests = fs::read_to_string(&fixture.curl_log).unwrap();
    assert!(requests.contains(&format!(
        "/releases/download/v{VERSION}/dosh-macos-aarch64.tar.gz"
    )));
    assert!(!requests.contains("/releases/download/v0.1.17/"));
}

#[test]
fn unix_installer_honors_an_explicit_exact_release_pin() {
    let pinned = "0.1.17";
    let fixture = InstallerFixture::new(pinned);
    let cwd = fixture.root.path().join("plain");
    fs::create_dir_all(&cwd).unwrap();
    let mut command = fixture.command(&cwd);
    command
        .env("TEST_RELEASE_VERSION", VERSION)
        .env("DOSH_BINARY_VERSION", format!("v{pinned}"))
        .env("DOSH_BINARY_EXACT", "1");

    let output = command.output().unwrap();
    assert!(
        output.status.success(),
        "installer failed: {}",
        String::from_utf8_lossy(&output.stderr)
    );
    let requests = fs::read_to_string(&fixture.curl_log).unwrap();
    assert!(requests.contains(&format!(
        "/releases/download/v{pinned}/dosh-macos-aarch64.tar.gz"
    )));
    assert!(!requests.contains(&format!("/releases/download/v{VERSION}/")));
}