use std::process::Command;
use tempfile::TempDir;

fn arc_cmd() -> Command {
    let mut cmd = Command::new(env!("CARGO_BIN_EXE_arc"));
    cmd.env("NO_COLOR", "1");
    cmd
}

fn init_repo() -> TempDir {
    let dir = TempDir::new().unwrap();
    arc_cmd()
        .arg("init")
        .current_dir(dir.path())
        .output()
        .expect("failed to init");
    dir
}

fn commit_file(dir: &TempDir, name: &str, content: &str, msg: &str) -> String {
    std::fs::write(dir.path().join(name), content).unwrap();
    let output = arc_cmd()
        .args(["commit", msg])
        .current_dir(dir.path())
        .output()
        .expect("failed to commit");
    assert!(output.status.success());
    String::from_utf8_lossy(&output.stdout)
        .trim()
        .strip_prefix("✓ committed ")
        .unwrap()
        .to_string()
}

#[test]
fn tag_add_creates_tag() {
    let dir = init_repo();
    commit_file(&dir, "a.txt", "hello\n", "first");

    let output = arc_cmd()
        .args(["tag", "add", "v1.0"])
        .current_dir(dir.path())
        .output()
        .expect("failed");

    assert!(output.status.success());
    let stdout = String::from_utf8_lossy(&output.stdout);
    assert!(stdout.contains("tag v1.0 set at"));

    let tag_path = dir.path().join(".arc").join("tags").join("v1.0");
    assert!(tag_path.exists());
}

#[test]
fn tag_add_at_specific_commit() {
    let dir = init_repo();
    let id1 = commit_file(&dir, "a.txt", "v1\n", "first");
    commit_file(&dir, "a.txt", "v2\n", "second");

    let short = &id1[..12];
    let output = arc_cmd()
        .args(["tag", "add", "v0.1", short])
        .current_dir(dir.path())
        .output()
        .expect("failed");

    assert!(output.status.success());
    let tag_content =
        std::fs::read_to_string(dir.path().join(".arc").join("tags").join("v0.1")).unwrap();
    assert!(tag_content.contains(&id1));
}

#[test]
fn tag_add_fails_if_already_exists() {
    let dir = init_repo();
    commit_file(&dir, "a.txt", "hello\n", "first");

    arc_cmd()
        .args(["tag", "add", "v1.0"])
        .current_dir(dir.path())
        .output()
        .expect("failed");

    let output = arc_cmd()
        .args(["tag", "add", "v1.0"])
        .current_dir(dir.path())
        .output()
        .expect("failed");

    assert!(!output.status.success());
    let stderr = String::from_utf8_lossy(&output.stderr);
    assert!(stderr.contains("tag already exists"));
}

#[test]
fn tag_add_fails_without_commits() {
    let dir = init_repo();

    let output = arc_cmd()
        .args(["tag", "add", "v1.0"])
        .current_dir(dir.path())
        .output()
        .expect("failed");

    assert!(!output.status.success());
    let stderr = String::from_utf8_lossy(&output.stderr);
    assert!(stderr.contains("no commits yet"));
}

#[test]
fn tag_rm_removes_tag() {
    let dir = init_repo();
    commit_file(&dir, "a.txt", "hello\n", "first");

    arc_cmd()
        .args(["tag", "add", "v1.0"])
        .current_dir(dir.path())
        .output()
        .expect("failed");

    let output = arc_cmd()
        .args(["tag", "rm", "v1.0"])
        .current_dir(dir.path())
        .output()
        .expect("failed");

    assert!(output.status.success());
    let stdout = String::from_utf8_lossy(&output.stdout);
    assert!(stdout.contains("tag v1.0 removed"));

    let tag_path = dir.path().join(".arc").join("tags").join("v1.0");
    assert!(!tag_path.exists());
}

#[test]
fn tag_rm_fails_for_nonexistent() {
    let dir = init_repo();
    commit_file(&dir, "a.txt", "hello\n", "first");

    let output = arc_cmd()
        .args(["tag", "rm", "nonexistent"])
        .current_dir(dir.path())
        .output()
        .expect("failed");

    assert!(!output.status.success());
    let stderr = String::from_utf8_lossy(&output.stderr);
    assert!(stderr.contains("tag not found"));
}

#[test]
fn tag_list_shows_tags() {
    let dir = init_repo();
    commit_file(&dir, "a.txt", "hello\n", "first");

    arc_cmd()
        .args(["tag", "add", "v1.0"])
        .current_dir(dir.path())
        .output()
        .expect("failed");

    arc_cmd()
        .args(["tag", "add", "v2.0"])
        .current_dir(dir.path())
        .output()
        .expect("failed");

    let output = arc_cmd()
        .args(["tag", "list"])
        .current_dir(dir.path())
        .output()
        .expect("failed");

    assert!(output.status.success());
    let stdout = String::from_utf8_lossy(&output.stdout);
    assert!(stdout.contains("v1.0"));
    assert!(stdout.contains("v2.0"));
}

#[test]
fn tag_list_sorted_alphabetically() {
    let dir = init_repo();
    commit_file(&dir, "a.txt", "hello\n", "first");

    arc_cmd()
        .args(["tag", "add", "v2.0"])
        .current_dir(dir.path())
        .output()
        .expect("failed");

    arc_cmd()
        .args(["tag", "add", "v1.0"])
        .current_dir(dir.path())
        .output()
        .expect("failed");

    let output = arc_cmd()
        .args(["tag", "list"])
        .current_dir(dir.path())
        .output()
        .expect("failed");

    let stdout = String::from_utf8_lossy(&output.stdout);
    let v1_pos = stdout.find("v1.0").unwrap();
    let v2_pos = stdout.find("v2.0").unwrap();
    assert!(v1_pos < v2_pos);
}

#[test]
fn tag_list_empty_when_no_tags() {
    let dir = init_repo();
    commit_file(&dir, "a.txt", "hello\n", "first");

    let output = arc_cmd()
        .args(["tag", "list"])
        .current_dir(dir.path())
        .output()
        .expect("failed");

    assert!(output.status.success());
    let stdout = String::from_utf8_lossy(&output.stdout);
    assert!(stdout.contains("no tags"));
}

#[test]
fn tag_list_shows_commit_ids() {
    let dir = init_repo();
    let id = commit_file(&dir, "a.txt", "hello\n", "first");

    arc_cmd()
        .args(["tag", "add", "v1.0"])
        .current_dir(dir.path())
        .output()
        .expect("failed");

    let output = arc_cmd()
        .args(["tag", "list"])
        .current_dir(dir.path())
        .output()
        .expect("failed");

    let stdout = String::from_utf8_lossy(&output.stdout);
    let short_id = &id[..12];
    assert!(stdout.contains(short_id));
}