use robotnik::setup::{Args, make_config};
use serial_test::serial;
use std::{fs, path::PathBuf};
use tempfile::TempDir;

/// Helper to create a temporary config file
fn create_config_file(dir: &TempDir, content: &str) -> PathBuf {
    let config_path = dir.path().join("config.toml");
    fs::write(&config_path, content).unwrap();
    config_path
}

/// Helper to parse config using environment and config file
async fn parse_config_from_file(config_path: &PathBuf) -> config::Config {
    config::Config::builder()
        .add_source(config::File::with_name(&config_path.to_string_lossy()).required(true))
        .build()
        .unwrap()
}

#[tokio::test]
#[serial]
async fn test_setup_make_config_overrides() {
    let temp = TempDir::new().unwrap();
    let config_content = "\
api-key = \"file-key\"
model = \"file-model\"
port = 6667
";
    let config_path = create_config_file(&temp, config_content);

    // Construct Args with overrides
    let args = Args {
        api_key: Some("cli-key".to_string()),
        base_url: None, /* Should fail if required and not in file/env? No, base-url is optional
                         * in args */
        chroot_dir: None,
        command_dir: None,
        instruct: None,
        model: None, // Should fallback to file
        channels: None,
        config_file: Some(config_path),
        server: None, // Should use default or file? Args has default "irc.libera.chat"
        port: Some("9999".to_string()),
        nickname: None,
        nick_password: None,
        username: None,
        use_tls: None,
    };

    let config = make_config(args).expect("Failed to make config");

    // Check overrides
    assert_eq!(config.get_string("api-key").unwrap(), "cli-key");
    assert_eq!(config.get_string("port").unwrap(), "9999");
    assert_eq!(config.get_int("port").unwrap(), 9999);

    // Check fallback to file
    assert_eq!(config.get_string("model").unwrap(), "file-model");
}

#[tokio::test]
async fn test_config_file_loads_all_settings() {
    let temp = TempDir::new().unwrap();
    let config_content = "\
api-key = \"test-api-key-123\"
base-url = \"https://api.test.com\"
chroot-dir = \"/test/chroot\"
command-path = \"/test/commands\"
model = \"test-model\"
instruct = \"Test instructions\"
server = \"test.irc.server\"
port = 6667
channels = [\"#test1\", \"#test2\"]
username = \"testuser\"
nickname = \"testnick\"
use-tls = false
";

    let config_path = create_config_file(&temp, config_content);
    let config = parse_config_from_file(&config_path).await;

    // Verify all settings are loaded correctly
    assert_eq!(config.get_string("api-key").unwrap(), "test-api-key-123");
    assert_eq!(
        config.get_string("base-url").unwrap(),
        "https://api.test.com"
    );
    assert_eq!(config.get_string("chroot-dir").unwrap(), "/test/chroot");
    assert_eq!(config.get_string("command-path").unwrap(), "/test/commands");
    assert_eq!(config.get_string("model").unwrap(), "test-model");
    assert_eq!(config.get_string("instruct").unwrap(), "Test instructions");
    assert_eq!(config.get_string("server").unwrap(), "test.irc.server");
    assert_eq!(config.get_int("port").unwrap(), 6667);

    let channels: Vec<String> = config.get("channels").unwrap();
    assert_eq!(channels, vec!["#test1", "#test2"]);

    assert_eq!(config.get_string("username").unwrap(), "testuser");
    assert_eq!(config.get_string("nickname").unwrap(), "testnick");
    assert_eq!(config.get_bool("use-tls").unwrap(), false);
}

#[tokio::test]
async fn test_config_file_partial_settings() {
    let temp = TempDir::new().unwrap();
    // Only provide required settings
    let config_content = "\
api-key = \"minimal-key\"
base-url = \"https://minimal.api.com\"
model = \"minimal-model\"
server = \"minimal.server\"
port = 6697
channels = [\"#minimal\"]
";

    let config_path = create_config_file(&temp, config_content);
    let config = parse_config_from_file(&config_path).await;

    // Verify required settings are loaded
    assert_eq!(config.get_string("api-key").unwrap(), "minimal-key");
    assert_eq!(
        config.get_string("base-url").unwrap(),
        "https://minimal.api.com"
    );
    assert_eq!(config.get_string("model").unwrap(), "minimal-model");

    // Verify optional settings are not present
    assert!(config.get_string("chroot-dir").is_err());
    assert!(config.get_string("instruct").is_err());
    assert!(config.get_string("username").is_err());
}

#[tokio::test]
#[serial]
async fn test_config_with_environment_variables() {
    // NOTE: This test documents a limitation in setup.rs
    // setup.rs uses Environment::with_prefix("BOT") without a separator
    // This means BOT_API_KEY maps to "api_key", NOT "api-key"
    // Since config.toml uses kebab-case, environment variables won't override properly
    // This is a known issue in the current implementation

    let temp = TempDir::new().unwrap();
    let config_content = "\
api_key = \"file-api-key\"
base_url = \"https://file.api.com\"
model = \"file-model\"
";

    let config_path = create_config_file(&temp, config_content);

    // Set environment variables (with BOT_ prefix as setup.rs uses)
    unsafe {
        std::env::set_var("BOT_API_KEY", "env-api-key");
        std::env::set_var("BOT_MODEL", "env-model");
    }

    let config = config::Config::builder()
        .add_source(config::File::with_name(&config_path.to_string_lossy()).required(true))
        .add_source(config::Environment::with_prefix("BOT"))
        .build()
        .unwrap();

    // Environment variables should override file settings (when using underscore keys)
    assert_eq!(config.get_string("api_key").unwrap(), "env-api-key");
    assert_eq!(config.get_string("model").unwrap(), "env-model");
    // File setting should be used when no env var
    assert_eq!(
        config.get_string("base_url").unwrap(),
        "https://file.api.com"
    );

    // Cleanup
    unsafe {
        std::env::remove_var("BOT_API_KEY");
        std::env::remove_var("BOT_MODEL");
    }
}

#[tokio::test]
async fn test_command_line_overrides_config_file() {
    let temp = TempDir::new().unwrap();
    let config_content = "\
api-key = \"file-api-key\"
base-url = \"https://file.api.com\"
model = \"file-model\"
server = \"file.server\"
port = 6667
channels = [\"#file\"]
nickname = \"filenick\"
username = \"fileuser\"
";

    let config_path = create_config_file(&temp, config_content);

    // Simulate command-line arguments overriding config file
    let config = config::Config::builder()
        .add_source(config::File::with_name(&config_path.to_string_lossy()).required(true))
        .set_override_option("api-key", Some("cli-api-key".to_string()))
        .unwrap()
        .set_override_option("model", Some("cli-model".to_string()))
        .unwrap()
        .set_override_option("server", Some("cli.server".to_string()))
        .unwrap()
        .set_override_option("nickname", Some("clinick".to_string()))
        .unwrap()
        .build()
        .unwrap();

    // Command-line values should override file settings
    assert_eq!(config.get_string("api-key").unwrap(), "cli-api-key");
    assert_eq!(config.get_string("model").unwrap(), "cli-model");
    assert_eq!(config.get_string("server").unwrap(), "cli.server");
    assert_eq!(config.get_string("nickname").unwrap(), "clinick");

    // Non-overridden values should come from file
    assert_eq!(
        config.get_string("base-url").unwrap(),
        "https://file.api.com"
    );
    assert_eq!(config.get_string("username").unwrap(), "fileuser");
    assert_eq!(config.get_int("port").unwrap(), 6667);
}

#[tokio::test]
#[serial]
async fn test_command_line_overrides_environment_and_file() {
    let temp = TempDir::new().unwrap();
    let config_content = "\
api_key = \"file-api-key\"
model = \"file-model\"
base_url = \"https://file.api.com\"
";

    let config_path = create_config_file(&temp, config_content);

    // Set environment variable
    unsafe {
        std::env::set_var("BOT_API_KEY", "env-api-key");
    }

    // Build config with all three sources
    let config = config::Config::builder()
        .add_source(config::File::with_name(&config_path.to_string_lossy()).required(true))
        .add_source(config::Environment::with_prefix("BOT"))
        .set_override_option("api_key", Some("cli-api-key".to_string()))
        .unwrap()
        .build()
        .unwrap();

    // Command-line should win over both environment and file
    assert_eq!(config.get_string("api_key").unwrap(), "cli-api-key");

    // Cleanup
    unsafe {
        std::env::remove_var("BOT_API_KEY");
    }
}

#[tokio::test]
#[serial]
async fn test_precedence_order() {
    // Test: CLI > Environment > Config File > Defaults
    // Using underscore keys to match how setup.rs actually works
    let temp = TempDir::new().unwrap();
    let config_content = "\
api_key = \"file-key\"
base_url = \"https://file-url.com\"
model = \"file-model\"
server = \"file-server\"
";

    let config_path = create_config_file(&temp, config_content);

    // Set environment variables
    unsafe {
        std::env::set_var("BOT_BASE_URL", "https://env-url.com");
        std::env::set_var("BOT_MODEL", "env-model");
    }

    let config = config::Config::builder()
        .add_source(config::File::with_name(&config_path.to_string_lossy()).required(true))
        .add_source(config::Environment::with_prefix("BOT"))
        .set_override_option("model", Some("cli-model".to_string()))
        .unwrap()
        .build()
        .unwrap();

    // CLI overrides everything
    assert_eq!(config.get_string("model").unwrap(), "cli-model");

    // Environment overrides file
    assert_eq!(
        config.get_string("base_url").unwrap(),
        "https://env-url.com"
    );

    // File is used when no env or CLI
    assert_eq!(config.get_string("api_key").unwrap(), "file-key");
    assert_eq!(config.get_string("server").unwrap(), "file-server");

    // Cleanup
    unsafe {
        std::env::remove_var("BOT_BASE_URL");
        std::env::remove_var("BOT_MODEL");
    }
}

#[tokio::test]
async fn test_boolean_use_tls_setting() {
    let temp = TempDir::new().unwrap();

    // Test with use-tls = true (kebab-case as in config.toml)
    let config_content_true = r#"
use-tls = true
"#;
    let config_path = create_config_file(&temp, config_content_true);
    let config = parse_config_from_file(&config_path).await;
    assert_eq!(config.get_bool("use-tls").unwrap(), true);

    // Test with use-tls = false
    let config_content_false = r#"
use-tls = false
"#;
    let config_path = create_config_file(&temp, config_content_false);
    let config = parse_config_from_file(&config_path).await;
    assert_eq!(config.get_bool("use-tls").unwrap(), false);
}

#[tokio::test]
async fn test_use_tls_naming_inconsistency() {
    // This test documents a bug: setup.rs uses "use_tls" (underscore)
    // but config.toml uses "use-tls" (kebab-case)
    let temp = TempDir::new().unwrap();
    let config_content = r#"
use-tls = true
"#;

    let config_path = create_config_file(&temp, config_content);

    // Build config the way setup.rs does it
    let config = config::Config::builder()
        .add_source(config::File::with_name(&config_path.to_string_lossy()).required(true))
        // setup.rs line 119 uses "use_tls" (underscore) instead of "use-tls" (kebab)
        .set_override_option("use_tls", Some(false))
        .unwrap()
        .build()
        .unwrap();

    // This should read from the override (false), not the file (true)
    // But due to the naming mismatch, it might not work as expected
    // The config file uses "use-tls" but the override uses "use_tls"

    // With kebab-case (matches config.toml)
    assert_eq!(config.get_bool("use-tls").unwrap(), true);

    // With underscore (matches setup.rs override)
    assert_eq!(config.get_bool("use_tls").unwrap(), false);
}

#[tokio::test]
async fn test_channels_as_array() {
    let temp = TempDir::new().unwrap();
    let config_content = "\
channels = [\"#chan1\", \"#chan2\", \"#chan3\"]
";

    let config_path = create_config_file(&temp, config_content);
    let config = parse_config_from_file(&config_path).await;

    let channels: Vec<String> = config.get("channels").unwrap();
    assert_eq!(channels.len(), 3);
    assert_eq!(channels[0], "#chan1");
    assert_eq!(channels[1], "#chan2");
    assert_eq!(channels[2], "#chan3");
}

#[tokio::test]
async fn test_channels_override_from_cli() {
    let temp = TempDir::new().unwrap();
    let config_content = "\
channels = [\"#file1\", \"#file2\"]
";

    let config_path = create_config_file(&temp, config_content);

    let cli_channels = vec![
        "#cli1".to_string(),
        "#cli2".to_string(),
        "#cli3".to_string(),
    ];

    let config = config::Config::builder()
        .add_source(config::File::with_name(&config_path.to_string_lossy()).required(true))
        .set_override_option("channels", Some(cli_channels.clone()))
        .unwrap()
        .build()
        .unwrap();

    let channels: Vec<String> = config.get("channels").unwrap();
    assert_eq!(channels, cli_channels);
    assert_eq!(channels.len(), 3);
}

#[tokio::test]
async fn test_port_as_integer() {
    let temp = TempDir::new().unwrap();
    let config_content = r#"
port = 6697
"#;

    let config_path = create_config_file(&temp, config_content);
    let config = parse_config_from_file(&config_path).await;

    // Port should be readable as both integer and string
    assert_eq!(config.get_int("port").unwrap(), 6697);
    assert_eq!(config.get_string("port").unwrap(), "6697");
}

#[tokio::test]
async fn test_port_override_from_cli_as_string() {
    // setup.rs passes port as Option<String> from clap
    let temp = TempDir::new().unwrap();
    let config_content = r#"
port = 6667
"#;

    let config_path = create_config_file(&temp, config_content);

    let config = config::Config::builder()
        .add_source(config::File::with_name(&config_path.to_string_lossy()).required(true))
        .set_override_option("port", Some("9999".to_string()))
        .unwrap()
        .build()
        .unwrap();

    // CLI override should work
    assert_eq!(config.get_string("port").unwrap(), "9999");
    assert_eq!(config.get_int("port").unwrap(), 9999);
}

#[tokio::test]
async fn test_missing_required_fields_fails() {
    let temp = TempDir::new().unwrap();
    // Create config without required api-key
    let config_content = r#"
model = "test-model"
"#;

    let config_path = create_config_file(&temp, config_content);
    let config = parse_config_from_file(&config_path).await;

    // Should fail when trying to get required field
    assert!(config.get_string("api-key").is_err());
}

#[tokio::test]
async fn test_optional_instruct_field() {
    let temp = TempDir::new().unwrap();
    let config_content = r#"
instruct = "Custom bot instructions"
"#;

    let config_path = create_config_file(&temp, config_content);
    let config = parse_config_from_file(&config_path).await;

    assert_eq!(
        config.get_string("instruct").unwrap(),
        "Custom bot instructions"
    );
}

#[tokio::test]
async fn test_command_path_field() {
    // command-path is in config.toml but not used anywhere in the code
    let temp = TempDir::new().unwrap();
    let config_content = r#"
command-path = "/custom/commands"
"#;

    let config_path = create_config_file(&temp, config_content);
    let config = parse_config_from_file(&config_path).await;

    assert_eq!(
        config.get_string("command-path").unwrap(),
        "/custom/commands"
    );
}

#[tokio::test]
async fn test_chroot_dir_field() {
    let temp = TempDir::new().unwrap();
    let config_content = r#"
chroot-dir = "/var/lib/bot/root"
"#;

    let config_path = create_config_file(&temp, config_content);
    let config = parse_config_from_file(&config_path).await;

    assert_eq!(
        config.get_string("chroot-dir").unwrap(),
        "/var/lib/bot/root"
    );
}

#[tokio::test]
async fn test_empty_config_file() {
    let temp = TempDir::new().unwrap();
    let config_content = "";

    let config_path = create_config_file(&temp, config_content);

    // Should build successfully but have no values
    let config = parse_config_from_file(&config_path).await;

    assert!(config.get_string("api-key").is_err());
    assert!(config.get_string("model").is_err());
}

#[tokio::test]
async fn test_all_cli_override_keys_match_config_format() {
    // This test documents which override keys in setup.rs match the config.toml format
    let temp = TempDir::new().unwrap();
    let config_content = "\
api-key = \"test\"
base-url = \"https://test.com\"
chroot-dir = \"/test\"
command-path = \"/cmds\"
model = \"test-model\"
instruct = \"test\"
channels = [\"#test\"]
server = \"test.server\"
port = 6697
nickname = \"test\"
username = \"test\"
use-tls = true
";

    let config_path = create_config_file(&temp, config_content);
    let config = parse_config_from_file(&config_path).await;

    // All these should work with kebab-case (as in config.toml)
    assert!(config.get_string("api-key").is_ok());
    assert!(config.get_string("base-url").is_ok());
    assert!(config.get_string("chroot-dir").is_ok());
    assert!(config.get_string("command-path").is_ok());
    assert!(config.get_string("model").is_ok());
    assert!(config.get_string("instruct").is_ok());
    let channels_result: Result<Vec<String>, _> = config.get("channels");
    assert!(channels_result.is_ok());
    assert!(config.get_string("server").is_ok());
    assert!(config.get_int("port").is_ok());
    assert!(config.get_string("nickname").is_ok());
    assert!(config.get_string("username").is_ok());
    assert!(config.get_bool("use-tls").is_ok());
}