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 switch_to_bookmark() {
    let dir = init_repo();
    commit_file(&dir, "a.txt", "v1\n", "first on main");

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

    commit_file(&dir, "a.txt", "v2\n", "second on main");

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

    assert!(output.status.success());
    let stdout = String::from_utf8_lossy(&output.stdout);
    assert!(stdout.contains("switched to bookmark feature"));

    let content = std::fs::read_to_string(dir.path().join("a.txt")).unwrap();
    assert_eq!(content, "v1\n");
}

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

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

    commit_file(&dir, "a.txt", "v2\n", "second");

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

    let head = std::fs::read_to_string(dir.path().join(".arc").join("HEAD")).unwrap();
    assert!(head.contains("attached"));
    assert!(head.contains("feature"));
}

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

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

    commit_file(&dir, "a.txt", "v2\n", "second");

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

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

    let content = std::fs::read_to_string(dir.path().join("a.txt")).unwrap();
    assert_eq!(content, "v1\n");

    let head = std::fs::read_to_string(dir.path().join(".arc").join("HEAD")).unwrap();
    assert!(head.contains("detached"));
}

#[test]
fn switch_to_commit_prefix() {
    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(["switch", short])
        .current_dir(dir.path())
        .output()
        .expect("failed");

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

    let content = std::fs::read_to_string(dir.path().join("a.txt")).unwrap();
    assert_eq!(content, "v1\n");
}

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

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

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

    let output = arc_cmd()
        .args(["switch", "feature"])
        .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 switch_removes_deleted_files() {
    let dir = init_repo();
    commit_file(&dir, "a.txt", "a\n", "first");
    commit_file(&dir, "b.txt", "b\n", "add b");

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

    let id1_output = arc_cmd()
        .args(["log"])
        .current_dir(dir.path())
        .output()
        .expect("failed");
    let _ = String::from_utf8_lossy(&id1_output.stdout);

    let first_id = {
        let log_output = arc_cmd()
            .args(["log"])
            .current_dir(dir.path())
            .output()
            .expect("failed");
        let stdout = String::from_utf8_lossy(&log_output.stdout);
        let lines: Vec<&str> = stdout.lines().collect();
        let last_commit_line = lines.iter().rev().find(|l| l.starts_with("●")).unwrap();
        let parts: Vec<&str> = last_commit_line.split_whitespace().collect();
        parts[1].to_string()
    };

    arc_cmd()
        .args(["mark", "add", "just-a", &first_id])
        .current_dir(dir.path())
        .output()
        .expect("failed");

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

    assert!(dir.path().join("a.txt").exists());
    assert!(!dir.path().join("b.txt").exists());
}

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

    arc_cmd()
        .args(["mark", "add", "no-b"])
        .current_dir(dir.path())
        .output()
        .expect("failed");

    commit_file(&dir, "b.txt", "b\n", "add b");

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

    arc_cmd()
        .args(["switch", "no-b"])
        .current_dir(dir.path())
        .output()
        .expect("failed");

    assert!(!dir.path().join("b.txt").exists());

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

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

#[test]
fn switch_preserves_ignored_files() {
    let dir = init_repo();
    std::fs::write(dir.path().join(".arcignore"), "*.log\n").unwrap();
    commit_file(&dir, "a.txt", "a\n", "first");

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

    std::fs::write(dir.path().join("debug.log"), "log data\n").unwrap();
    commit_file(&dir, "a.txt", "v2\n", "second");

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

    assert!(dir.path().join("debug.log").exists());
}

#[test]
fn switch_back_and_forth() {
    let dir = init_repo();
    commit_file(&dir, "a.txt", "main-v1\n", "main first");

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

    commit_file(&dir, "a.txt", "main-v2\n", "main second");

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

    let content = std::fs::read_to_string(dir.path().join("a.txt")).unwrap();
    assert_eq!(content, "main-v1\n");

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

    let content = std::fs::read_to_string(dir.path().join("a.txt")).unwrap();
    assert_eq!(content, "main-v2\n");
}

#[test]
fn switch_cleans_empty_directories() {
    let dir = init_repo();
    std::fs::create_dir_all(dir.path().join("src")).unwrap();
    std::fs::write(dir.path().join("src/main.rs"), "fn main() {}\n").unwrap();
    commit_file(&dir, "root.txt", "root\n", "first");

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

    std::fs::remove_file(dir.path().join("src/main.rs")).unwrap();
    std::fs::remove_dir(dir.path().join("src")).unwrap();
    commit_file(&dir, "root.txt", "root v2\n", "remove src");

    arc_cmd()
        .args(["mark", "add", "no-src"])
        .current_dir(dir.path())
        .output()
        .expect("failed");

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

    assert!(dir.path().join("src/main.rs").exists());

    arc_cmd()
        .args(["switch", "no-src"])
        .current_dir(dir.path())
        .output()
        .expect("failed");

    assert!(!dir.path().join("src").exists());
}

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

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

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