use std::{error::Error, fs, process::Command};

use git2::{Repository, Signature};
use tempfile::TempDir;

// shared test helpers
mod common;
use common::{
  init_bare_repo,
  init_repo_with_commit,
  pakker_bin_path,
  push_to_remote,
};

#[test]
fn happy_path_from_path() -> Result<(), Box<dyn Error>> {
  let tmp = TempDir::new()?;
  let tmp_path = tmp.path().to_path_buf();

  let upstream = tmp_path.join("upstream.git");
  init_bare_repo(&upstream)?;

  let work = tmp_path.join("work_repo");
  fs::create_dir_all(&work)?;
  let work_repo = init_repo_with_commit(&work, "README.md", "hello")?;
  push_to_remote(&work_repo, "origin", upstream.to_str().unwrap())?;

  // Clone upstream to local path
  let local = tmp_path.join("local_clone");
  Repository::clone(upstream.to_str().unwrap(), &local)?;

  // Now create a new project dir where pakker will be initialized
  let project = tmp_path.join("project_dir");
  fs::create_dir_all(&project)?;

  let pakker = pakker_bin_path();
  let status = Command::new(pakker)
    .args([
      "fork",
      "init",
      "--from-path",
      local.to_str().unwrap(),
      "--ref-name",
      "master",
    ])
    .current_dir(&project)
    .status()?;
  assert!(status.success());

  let parent = project.join(".pakku").join("parent");
  assert!(parent.exists());
  Ok(())
}

#[test]
fn fails_with_uncommitted_changes() -> Result<(), Box<dyn Error>> {
  let tmp = TempDir::new()?;
  let tmp_path = tmp.path().to_path_buf();

  let upstream = tmp_path.join("upstream2.git");
  init_bare_repo(&upstream)?;

  let work = tmp_path.join("work2");
  fs::create_dir_all(&work)?;
  let work_repo = init_repo_with_commit(&work, "file.txt", "a")?;
  work_repo.remote("origin", upstream.to_str().unwrap())?;
  push_to_remote(&work_repo, "origin", upstream.to_str().unwrap())?;

  let local = tmp_path.join("local2");
  Repository::clone(upstream.to_str().unwrap(), &local)?;

  // Make an uncommitted change
  fs::write(local.join("UNCOMMITTED.md"), "oops")?;

  let project = tmp_path.join("project2");
  fs::create_dir_all(&project)?;
  let pakker = pakker_bin_path();
  let output = Command::new(pakker)
    .args([
      "fork",
      "init",
      "--from-path",
      local.to_str().unwrap(),
      "--ref-name",
      "master",
    ])
    .current_dir(&project)
    .output()?;

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

#[test]
fn fails_when_local_ahead() -> Result<(), Box<dyn Error>> {
  let tmp = TempDir::new()?;
  let tmp_path = tmp.path().to_path_buf();

  let upstream = tmp_path.join("upstream3.git");
  init_bare_repo(&upstream)?;

  let work = tmp_path.join("work3");
  fs::create_dir_all(&work)?;
  let work_repo = init_repo_with_commit(&work, "f.txt", "1")?;
  work_repo.remote("origin", upstream.to_str().unwrap())?;
  push_to_remote(&work_repo, "origin", upstream.to_str().unwrap())?;

  let local = tmp_path.join("local3");
  Repository::clone(upstream.to_str().unwrap(), &local)?;

  // Create a new commit locally that is not pushed
  {
    let repo = Repository::open(&local)?;
    let workdir = repo.workdir().ok_or("no workdir")?;
    fs::write(workdir.join("f.txt"), "2")?;
    let mut index = repo.index()?;
    index.add_path(std::path::Path::new("f.txt"))?;
    index.write()?;
    let tree_oid = index.write_tree()?;
    let tree = repo.find_tree(tree_oid)?;
    let sig = Signature::now("Test User", "test@example.com")?;
    let head = repo.head()?;
    let parent = head.peel_to_commit()?;
    repo.commit(Some("HEAD"), &sig, &sig, "local change", &tree, &[&parent])?;
  }

  let project = tmp_path.join("project3");
  fs::create_dir_all(&project)?;
  let pakker = pakker_bin_path();
  let output = Command::new(pakker)
    .args([
      "fork",
      "init",
      "--from-path",
      local.to_str().unwrap(),
      "--ref-name",
      "master",
    ])
    .current_dir(&project)
    .output()?;

  assert!(!output.status.success());
  let stderr = String::from_utf8_lossy(&output.stderr);
  assert!(
    stderr.to_lowercase().contains("commits not present")
      || stderr.to_lowercase().contains("not present on upstream")
  );
  Ok(())
}

#[test]
fn warns_on_fetch_failure_and_proceeds() -> Result<(), Box<dyn Error>> {
  let tmp = TempDir::new()?;
  let tmp_path = tmp.path().to_path_buf();

  let upstream = tmp_path.join("upstream4.git");
  init_bare_repo(&upstream)?;

  let work = tmp_path.join("work4");
  fs::create_dir_all(&work)?;
  let work_repo = init_repo_with_commit(&work, "a.txt", "1")?;
  work_repo.remote("origin", upstream.to_str().unwrap())?;
  push_to_remote(&work_repo, "origin", upstream.to_str().unwrap())?;

  let local = tmp_path.join("local4");
  Repository::clone(upstream.to_str().unwrap(), &local)?;

  // Set an invalid URL for origin to force fetch failure
  let repo = Repository::open(&local)?;
  repo.remote_set_url("origin", "git@invalid:nonexistent/repo.git")?;

  let project = tmp_path.join("project4");
  fs::create_dir_all(&project)?;
  let pakker = pakker_bin_path();
  let status = Command::new(pakker)
    .args([
      "fork",
      "init",
      "--from-path",
      local.to_str().unwrap(),
      "--ref-name",
      "master",
    ])
    .current_dir(&project)
    .status()?;

  assert!(status.success());
  let parent = project.join(".pakku").join("parent");
  assert!(parent.exists());
  Ok(())
}