use git2::Repository;
use git2::Signature;
use git_commitizen::{
    build_commit_message, build_commit_types, format_commit_types, perform_commit,
};
use std::path::Path;
use tempfile;

#[test]
fn test_build_commit_types() {
    let commit_types = build_commit_types();
    assert!(!commit_types.is_empty(), "Commit types should not be empty");
    assert!(
        commit_types.iter().any(|&(t, _)| t == "feat"),
        "Should include 'feat' type"
    );
    assert!(
        commit_types.iter().any(|&(t, _)| t == "fix"),
        "Should include 'fix' type"
    );
}

#[test]
fn test_format_commit_types() {
    let commit_types = vec![
        ("feat", "A new feature"),
        ("fix", "A bug fix"),
        ("docs", "Documentation updates"),
    ];

    let formatted = format_commit_types(commit_types);

    let expected = vec![
        "feat     - A new feature".to_string(),
        "fix      - A bug fix".to_string(),
        "docs     - Documentation updates".to_string(),
    ];

    assert_eq!(formatted, expected);
}

#[test]
fn test_format_commit_types_empty_list() {
    let commit_types = vec![];
    let formatted = format_commit_types(commit_types);
    assert!(
        formatted.is_empty(),
        "Formatting an empty list should result in an empty vector"
    );
}

#[test]
fn test_format_commit_types_varying_lengths() {
    let commit_types = vec![
        ("a", "Short"),
        ("looong", "A longer type"),
        ("medium", "Medium length"),
    ];

    let formatted = format_commit_types(commit_types);

    let expected = vec![
        "a          - Short".to_string(),
        "looong     - A longer type".to_string(),
        "medium     - Medium length".to_string(),
    ];

    assert_eq!(formatted, expected);
}

#[test]
fn test_build_commit_message() {
    let commit_type = "feat";
    let scope = "ui";
    let description = "Add new button";
    let body = "This button allows users to submit the form.";

    let commit_message = build_commit_message(commit_type, scope, description, body);
    assert_eq!(
        commit_message,
        "feat(ui): Add new button\n\nThis button allows users to submit the form."
    );

    let commit_message_no_scope = build_commit_message(commit_type, "", description, body);
    assert_eq!(
        commit_message_no_scope,
        "feat: Add new button\n\nThis button allows users to submit the form."
    );

    let commit_message_no_body = build_commit_message(commit_type, scope, description, "");
    assert_eq!(commit_message_no_body, "feat(ui): Add new button");
}

#[test]
fn test_build_commit_message_edge_cases() {
    // All empty strings
    let empty_message = build_commit_message("", "", "", "");
    assert_eq!(empty_message, ": ", "Empty inputs should result in ': '");

    // Very long strings
    let long_type = "a".repeat(50);
    let long_scope = "b".repeat(50);
    let long_description = "c".repeat(100);
    let long_body = "d".repeat(1000);

    let long_message = build_commit_message(&long_type, &long_scope, &long_description, &long_body);
    assert!(long_message.starts_with(&format!("{}({}):", long_type, long_scope)));
    assert!(long_message.contains(&long_description));
    assert!(long_message.contains(&long_body));

    // Special characters
    let special_message = build_commit_message("type!", "scope@", "description#", "body$");
    assert_eq!(special_message, "type!(scope@): description#\n\nbody$");
}

#[test]
fn test_perform_commit() {
    let temp_dir = tempfile::tempdir().unwrap();
    let repo = Repository::init(temp_dir.path()).unwrap();

    let mut index = repo.index().unwrap();
    let _oid = repo.refname_to_id("HEAD").unwrap_or_else(|_| {
        let tree = repo.treebuilder(None).unwrap().write().unwrap();
        repo.commit(
            Some("HEAD"),
            &repo.signature().unwrap(),
            &repo.signature().unwrap(),
            "Initial commit",
            &repo.find_tree(tree).unwrap(),
            &[],
        )
        .unwrap()
    });

    let full_commit_message = "test: Test commit";

    std::fs::write(temp_dir.path().join("test.txt"), "Test content").unwrap();
    index.add_path(Path::new("test.txt")).unwrap();
    index.write().unwrap();

    perform_commit(temp_dir.path(), &full_commit_message).unwrap();

    let head = repo.head().unwrap();
    let commit = repo.find_commit(head.target().unwrap()).unwrap();
    assert_eq!(commit.message().unwrap(), full_commit_message);
}

#[test]
fn test_perform_commit_multiple_files() {
    let temp_dir = tempfile::tempdir().unwrap();
    let repo = Repository::init(temp_dir.path()).unwrap();

    // Create initial commit
    let mut index = repo.index().unwrap();
    let _oid = repo.refname_to_id("HEAD").unwrap_or_else(|_| {
        let tree = repo.treebuilder(None).unwrap().write().unwrap();
        repo.commit(
            Some("HEAD"),
            &repo.signature().unwrap(),
            &repo.signature().unwrap(),
            "Initial commit",
            &repo.find_tree(tree).unwrap(),
            &[],
        )
        .unwrap()
    });

    // Create multiple files
    std::fs::write(temp_dir.path().join("file1.txt"), "Content 1").unwrap();
    std::fs::write(temp_dir.path().join("file2.txt"), "Content 2").unwrap();

    // Add files to index
    index.add_path(Path::new("file1.txt")).unwrap();
    index.add_path(Path::new("file2.txt")).unwrap();
    index.write().unwrap();

    let full_commit_message = "feat: Add multiple files";
    perform_commit(temp_dir.path(), &full_commit_message).unwrap();

    let head = repo.head().unwrap();
    let commit = repo.find_commit(head.target().unwrap()).unwrap();
    assert_eq!(commit.message().unwrap(), full_commit_message);

    // Verify both files are in the commit
    let tree = commit.tree().unwrap();
    assert!(tree.get_name("file1.txt").is_some());
    assert!(tree.get_name("file2.txt").is_some());
}

#[test]
fn test_perform_commit_no_changes() {
    let temp_dir = tempfile::tempdir().unwrap();
    let repo = Repository::init(temp_dir.path()).unwrap();

    // Create initial commit
    let mut index = repo.index().unwrap();
    let tree_id = index.write_tree().unwrap();
    let tree = repo.find_tree(tree_id).unwrap();
    let signature = Signature::now("Test User", "test@example.com").unwrap();
    repo.commit(
        Some("HEAD"),
        &signature,
        &signature,
        "Initial commit",
        &tree,
        &[],
    )
    .unwrap();

    let full_commit_message = "feat: This commit should fail";
    let result = perform_commit(temp_dir.path(), &full_commit_message);

    assert!(result.is_err(), "Commit with no changes should fail");
    assert_eq!(
        result.unwrap_err().to_string(),
        "Nothing to commit, working directory clean",
        "Error message should indicate nothing to commit"
    );
}

#[test]
fn test_full_workflow() {
    let temp_dir = tempfile::tempdir().unwrap();
    let repo = Repository::init(temp_dir.path()).unwrap();

    // Create initial commit
    let mut index = repo.index().unwrap();
    let _oid = repo.refname_to_id("HEAD").unwrap_or_else(|_| {
        let tree = repo.treebuilder(None).unwrap().write().unwrap();
        repo.commit(
            Some("HEAD"),
            &repo.signature().unwrap(),
            &repo.signature().unwrap(),
            "Initial commit",
            &repo.find_tree(tree).unwrap(),
            &[],
        )
        .unwrap()
    });

    // Create a file
    std::fs::write(temp_dir.path().join("feature.txt"), "New feature").unwrap();
    index.add_path(Path::new("feature.txt")).unwrap();
    index.write().unwrap();

    // Use build_commit_message to create a commit message
    let commit_type = "feat";
    let scope = "user-interface";
    let description = "Add new feature";
    let body = "This commit adds a new feature to improve user experience.";

    let commit_message = build_commit_message(commit_type, scope, description, body);

    // Perform the commit
    perform_commit(temp_dir.path(), &commit_message).unwrap();

    // Verify the commit
    let head = repo.head().unwrap();
    let commit = repo.find_commit(head.target().unwrap()).unwrap();
    assert_eq!(commit.message().unwrap(), commit_message);

    // Verify the file is in the commit
    let tree = commit.tree().unwrap();
    assert!(tree.get_name("feature.txt").is_some());
}

#[test]
#[should_panic(expected = "No such file or directory")]
fn test_perform_commit_invalid_path() {
    let invalid_path = Path::new("/this/path/does/not/exist");
    let commit_message = "This commit should fail";
    perform_commit(invalid_path, commit_message).unwrap();
}