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 graft_single_commit_onto_bookmark() {
    let dir = init_repo();
    commit_file(&dir, "base.txt", "base\n", "base");

    arc_cmd()
        .args(["mark", "add", "feature"])
        .current_dir(dir.path())
        .output()
        .expect("failed");

    arc_cmd()
        .args(["switch", "feature"])
        .current_dir(dir.path())
        .output()
        .expect("failed");

    let cherry = commit_file(&dir, "cherry.txt", "cherry\n", "cherry pick me");

    arc_cmd()
        .args(["switch", "main"])
        .current_dir(dir.path())
        .output()
        .expect("failed");

    let output = arc_cmd()
        .args(["graft", &cherry, "--onto", "main"])
        .current_dir(dir.path())
        .output()
        .expect("failed");

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

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

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

    arc_cmd()
        .args(["mark", "add", "feature"])
        .current_dir(dir.path())
        .output()
        .expect("failed");

    arc_cmd()
        .args(["switch", "feature"])
        .current_dir(dir.path())
        .output()
        .expect("failed");

    let cherry = commit_file(&dir, "cherry.txt", "cherry\n", "cherry");

    arc_cmd()
        .args(["switch", "main"])
        .current_dir(dir.path())
        .output()
        .expect("failed");

    arc_cmd()
        .args(["graft", &cherry, "--onto", "main"])
        .current_dir(dir.path())
        .output()
        .expect("failed");

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

    let log_stdout = String::from_utf8_lossy(&log_output.stdout);
    assert!(log_stdout.contains("graft"));
}

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

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

    let output = arc_cmd()
        .args(["graft", &id, "--onto", "main"])
        .current_dir(dir.path())
        .output()
        .expect("failed");

    assert!(!output.status.success());
    let stderr = String::from_utf8_lossy(&output.stderr);
    assert!(stderr.contains("uncommitted changes"));
}

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

    arc_cmd()
        .args(["mark", "add", "feature"])
        .current_dir(dir.path())
        .output()
        .expect("failed");

    arc_cmd()
        .args(["switch", "feature"])
        .current_dir(dir.path())
        .output()
        .expect("failed");

    let cherry = commit_file(&dir, "cherry.txt", "cherry\n", "cherry");

    arc_cmd()
        .args(["switch", "main"])
        .current_dir(dir.path())
        .output()
        .expect("failed");

    arc_cmd()
        .args(["graft", &cherry, "--onto", "main"])
        .current_dir(dir.path())
        .output()
        .expect("failed");

    let show_output = arc_cmd()
        .args(["show", &cherry])
        .current_dir(dir.path())
        .output()
        .expect("failed");

    assert!(show_output.status.success());
    let show_stdout = String::from_utf8_lossy(&show_output.stdout);
    assert!(show_stdout.contains("cherry"));
}

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

    arc_cmd()
        .args(["mark", "add", "feature"])
        .current_dir(dir.path())
        .output()
        .expect("failed");

    arc_cmd()
        .args(["switch", "feature"])
        .current_dir(dir.path())
        .output()
        .expect("failed");

    let cherry = commit_file(&dir, "cherry.txt", "cherry\n", "cherry");

    arc_cmd()
        .args(["switch", "main"])
        .current_dir(dir.path())
        .output()
        .expect("failed");

    let short = &cherry[..12];
    let output = arc_cmd()
        .args(["graft", short, "--onto", "main"])
        .current_dir(dir.path())
        .output()
        .expect("failed");

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