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 reset_all_restores_modified_file() {
    let dir = init_repo();
    commit_file(&dir, "a.txt", "original\n", "first");

    std::fs::write(dir.path().join("a.txt"), "modified\n").unwrap();

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

    assert!(output.status.success());
    let stdout = String::from_utf8_lossy(&output.stdout);
    assert!(stdout.contains("reset"));

    let content = std::fs::read_to_string(dir.path().join("a.txt")).unwrap();
    assert_eq!(content, "original\n");
}

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

    std::fs::write(dir.path().join("new.txt"), "new\n").unwrap();

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

    assert!(output.status.success());
    assert!(!dir.path().join("new.txt").exists());
}

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

    std::fs::remove_file(dir.path().join("a.txt")).unwrap();

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

    assert!(output.status.success());
    let content = std::fs::read_to_string(dir.path().join("a.txt")).unwrap();
    assert_eq!(content, "a\n");
}

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

    std::fs::write(dir.path().join("a.txt"), "changed-a\n").unwrap();
    std::fs::write(dir.path().join("b.txt"), "changed-b\n").unwrap();

    let output = arc_cmd()
        .args(["reset", "a.txt"])
        .current_dir(dir.path())
        .output()
        .expect("failed");

    assert!(output.status.success());

    let a_content = std::fs::read_to_string(dir.path().join("a.txt")).unwrap();
    assert_eq!(a_content, "a\n");

    let b_content = std::fs::read_to_string(dir.path().join("b.txt")).unwrap();
    assert_eq!(b_content, "changed-b\n");
}

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

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

    assert!(output.status.success());
    let stdout = String::from_utf8_lossy(&output.stdout);
    assert!(stdout.contains("nothing to reset"));
}

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

    std::fs::write(dir.path().join("a.txt"), "changed\n").unwrap();
    std::fs::remove_file(dir.path().join("b.txt")).unwrap();
    std::fs::write(dir.path().join("c.txt"), "new\n").unwrap();

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

    assert!(output.status.success());

    let a = std::fs::read_to_string(dir.path().join("a.txt")).unwrap();
    assert_eq!(a, "a\n");
    assert!(dir.path().join("b.txt").exists());
    assert!(!dir.path().join("c.txt").exists());
}