#[macro_export]
macro_rules! register_client {
    (
        $(($module:ident, $name:literal, $config:ident, $client:ident),)+
    ) => {
        $(
            mod $module;
        )+
        $(
            use self::$module::$config;
        )+

        #[derive(Debug, Clone, serde::Deserialize)]
        #[serde(tag = "type")]
        pub enum ClientConfig {
            $(
                #[serde(rename = $name)]
                $config($config),
            )+
            #[serde(other)]
            Unknown,
        }

        $(
            #[derive(Debug)]
            pub struct $client {
                app_config: std::sync::Arc<$crate::config::AppConfig>,
                config: $config,
                model: $crate::client::Model,
            }

            impl $client {
                pub const NAME: &'static str = $name;

                pub fn init(app_config: &std::sync::Arc<$crate::config::AppConfig>, model: &$crate::client::Model) -> Option<Box<dyn Client>> {
                    let config = app_config.clients.iter().find_map(|client_config| {
                        if let ClientConfig::$config(c) = client_config {
                            if Self::name(c) == model.client_name() {
                                return Some(c.clone())
                            }
                        }
                        None
                    })?;

                    Some(Box::new(Self {
                        app_config: std::sync::Arc::clone(app_config),
                        config,
                        model: model.clone(),
                    }))
                }

                pub fn list_models(local_config: &$config) -> Vec<Model> {
                    let client_name = Self::name(local_config);
                    if local_config.models.is_empty() {
                        if let Some(v) = $crate::client::ALL_PROVIDER_MODELS.iter().find(|v| {
                            v.provider == $name ||
                                ($name == OpenAICompatibleClient::NAME
                                    && local_config.name.as_ref().map(|name| name.starts_with(&v.provider)).unwrap_or_default())
                        }) {
                            return Model::from_config(client_name, &v.models);
                        }
                        vec![]
                    } else {
                        Model::from_config(client_name, &local_config.models)
                    }
                }

                pub fn name(local_config: &$config) -> &str {
                    local_config.name.as_deref().unwrap_or(Self::NAME)
                }
            }

        )+

        pub fn init_client(app_config: &std::sync::Arc<$crate::config::AppConfig>, model: $crate::client::Model) -> anyhow::Result<Box<dyn Client>> {
            None
            $(.or_else(|| $client::init(app_config, &model)))+
            .ok_or_else(|| {
                anyhow::anyhow!("Invalid model '{}'", model.id())
            })
        }

        pub fn list_client_types() -> Vec<&'static str> {
            let mut client_types: Vec<_> = vec![$($client::NAME,)+];
            client_types.extend($crate::client::OPENAI_COMPATIBLE_PROVIDERS.iter().map(|(name, _)| *name));
            client_types
        }

        pub async fn create_client_config(client: &str, vault: &$crate::vault::Vault) -> anyhow::Result<(String, serde_json::Value)> {
            $(
                if client == $client::NAME && client != $crate::client::OpenAICompatibleClient::NAME {
                    return $client::create_client_config(vault).await
                }
            )+
            if let Some(ret) = create_openai_compatible_client_config(client).await? {
                return Ok(ret);
            }
            anyhow::bail!("Unknown client '{}'", client)
        }

        static ALL_CLIENT_NAMES: std::sync::OnceLock<Vec<String>> = std::sync::OnceLock::new();

        pub fn list_client_names(config: &$crate::config::AppConfig) -> Vec<&'static String> {
            let names = ALL_CLIENT_NAMES.get_or_init(|| {
                config
                    .clients
                    .iter()
                    .flat_map(|v| match v {
                        $(ClientConfig::$config(c) => vec![$client::name(c).to_string()],)+
                        ClientConfig::Unknown => vec![],
                    })
                    .collect()
            });
            names.iter().collect()
        }

        static ALL_MODELS: std::sync::OnceLock<Vec<$crate::client::Model>> = std::sync::OnceLock::new();

        pub fn list_all_models(config: &$crate::config::AppConfig) -> Vec<&'static $crate::client::Model> {
            let models = ALL_MODELS.get_or_init(|| {
                config
                    .clients
                    .iter()
                    .flat_map(|v| match v {
                        $(ClientConfig::$config(c) => $client::list_models(c),)+
                        ClientConfig::Unknown => vec![],
                    })
                    .collect()
            });
            models.iter().collect()
        }

        pub fn list_models(config: &$crate::config::AppConfig, model_type: $crate::client::ModelType) -> Vec<&'static $crate::client::Model> {
            list_all_models(config).into_iter().filter(|v| v.model_type() == model_type).collect()
        }
    };
}

#[macro_export]
macro_rules! client_common_fns {
    () => {
        fn app_config(&self) -> &$crate::config::AppConfig {
            &self.app_config
        }

        fn extra_config(&self) -> Option<&$crate::client::ExtraConfig> {
            self.config.extra.as_ref()
        }

        fn patch_config(&self) -> Option<&$crate::client::RequestPatch> {
            self.config.patch.as_ref()
        }

        fn name(&self) -> &str {
            Self::name(&self.config)
        }

        fn model(&self) -> &Model {
            &self.model
        }
    };
}

#[macro_export]
macro_rules! impl_client_trait {
    (
        $client:ident,
        ($prepare_chat_completions:path, $chat_completions:path, $chat_completions_streaming:path),
        ($prepare_embeddings:path, $embeddings:path),
        ($prepare_rerank:path, $rerank:path),
    ) => {
        #[async_trait::async_trait]
        impl $crate::client::Client for $crate::client::$client {
            client_common_fns!();

            async fn chat_completions_inner(
                &self,
                client: &reqwest::Client,
                data: $crate::client::ChatCompletionsData,
            ) -> anyhow::Result<$crate::client::ChatCompletionsOutput> {
                let request_data = $prepare_chat_completions(self, data)?;
                let builder = self.request_builder(client, request_data);
                $chat_completions(builder, self.model()).await
            }

            async fn chat_completions_streaming_inner(
                &self,
                client: &reqwest::Client,
                handler: &mut $crate::client::SseHandler,
                data: $crate::client::ChatCompletionsData,
            ) -> Result<()> {
                let request_data = $prepare_chat_completions(self, data)?;
                let builder = self.request_builder(client, request_data);
                $chat_completions_streaming(builder, handler, self.model()).await
            }

            async fn embeddings_inner(
                &self,
                client: &reqwest::Client,
                data: &$crate::client::EmbeddingsData,
            ) -> Result<$crate::client::EmbeddingsOutput> {
                let request_data = $prepare_embeddings(self, data)?;
                let builder = self.request_builder(client, request_data);
                $embeddings(builder, self.model()).await
            }

            async fn rerank_inner(
                &self,
                client: &reqwest::Client,
                data: &$crate::client::RerankData,
            ) -> Result<$crate::client::RerankOutput> {
                let request_data = $prepare_rerank(self, data)?;
                let builder = self.request_builder(client, request_data);
                $rerank(builder, self.model()).await
            }
        }
    };
}

#[macro_export]
macro_rules! create_client_config {
    ($prompts:expr) => {
        pub async fn create_client_config(
            vault: &$crate::vault::Vault,
        ) -> anyhow::Result<(String, serde_json::Value)> {
            $crate::client::create_config(&$prompts, Self::NAME, vault).await
        }
    };
}

#[macro_export]
macro_rules! create_oauth_supported_client_config {
    () => {
        pub async fn create_client_config(vault: &$crate::vault::Vault) -> anyhow::Result<(String, serde_json::Value)> {
        let mut config = serde_json::json!({ "type": Self::NAME });

        let auth_method = inquire::Select::new(
            "Authentication method:",
            vec!["API Key", "OAuth"],
        )
        .prompt()?;

        if auth_method == "API Key" {
            let env_name = format!("{}_API_KEY", Self::NAME).to_ascii_uppercase();
            vault.add_secret(&env_name)?;
            config["api_key"] = format!("{{{{{env_name}}}}}").into();
        } else {
            config["auth"] = "oauth".into();
        }

        let model = $crate::client::set_client_models_config(&mut config, Self::NAME).await?;
        let clients = json!(vec![config]);
        Ok((model, clients))
      }
    }
}

#[macro_export]
macro_rules! config_get_fn {
    ($field_name:ident, $fn_name:ident) => {
        fn $fn_name(&self) -> anyhow::Result<String> {
            let env_prefix = Self::name(&self.config);
            let env_name =
                format!("{}_{}", env_prefix, stringify!($field_name)).to_ascii_uppercase();
            std::env::var(&env_name)
                .ok()
                .or_else(|| self.config.$field_name.clone())
                .ok_or_else(|| anyhow::anyhow!("Missing '{}'", stringify!($field_name)))
        }
    };
}

#[macro_export]
macro_rules! unsupported_model {
    ($name:expr) => {
        anyhow::bail!("Unsupported model '{}'", $name)
    };
}
