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 revert_single_commit() {
    let dir = init_repo();
    commit_file(&dir, "a.txt", "original\n", "first");
    let id2 = commit_file(&dir, "a.txt", "changed\n", "second");

    let output = arc_cmd()
        .args(["revert", &id2])
        .current_dir(dir.path())
        .output()
        .expect("failed");

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

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

#[test]
fn revert_creates_new_commit() {
    let dir = init_repo();
    commit_file(&dir, "a.txt", "v1\n", "first");
    let id2 = commit_file(&dir, "a.txt", "v2\n", "second");

    let output = arc_cmd()
        .args(["revert", &id2])
        .current_dir(dir.path())
        .output()
        .expect("failed");

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

    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("revert"));
}

#[test]
fn revert_file_addition() {
    let dir = init_repo();
    commit_file(&dir, "a.txt", "a\n", "first");
    let id2 = commit_file(&dir, "b.txt", "b\n", "add b");

    let output = arc_cmd()
        .args(["revert", &id2])
        .current_dir(dir.path())
        .output()
        .expect("failed");

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

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

    std::fs::remove_file(dir.path().join("b.txt")).unwrap();
    let id3 = {
        let output = arc_cmd()
            .args(["commit", "delete b"])
            .current_dir(dir.path())
            .output()
            .expect("failed");
        assert!(output.status.success());
        String::from_utf8_lossy(&output.stdout)
            .trim()
            .strip_prefix("✓ committed ")
            .unwrap()
            .to_string()
    };

    let output = arc_cmd()
        .args(["revert", &id3])
        .current_dir(dir.path())
        .output()
        .expect("failed");

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

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

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

    let output = arc_cmd()
        .args(["revert", &id])
        .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 revert_with_prefix() {
    let dir = init_repo();
    commit_file(&dir, "a.txt", "v1\n", "first");
    let id2 = commit_file(&dir, "a.txt", "v2\n", "second");

    let short = &id2[..12];
    let output = arc_cmd()
        .args(["revert", short])
        .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, "v1\n");
}