//! Client for interacting with the Immich API

use crate::apis::{AlbumsApi, AssetsApi, SearchApi, ServerApi, TimelineApi};
use crate::error::{ImmichError, Result};
use std::sync::Arc;
use std::time::Duration;

/// Configuration for the Immich client
#[derive(Debug, Clone)]
pub struct Config {
    /// Base URL of the Immich server
    pub base_url: String,
    /// API key for authentication
    pub api_key: Option<String>,
    /// Request timeout
    pub timeout: Duration,
    /// User agent string
    pub user_agent: String,
}

impl Default for Config {
    fn default() -> Self {
        Self {
            base_url: String::new(),
            api_key: None,
            timeout: Duration::from_secs(30),
            user_agent: format!("immich-sdk/{} (Rust)", env!("CARGO_PKG_VERSION")),
        }
    }
}

impl Config {
    /// Create a new config with the given base URL
    pub fn new(base_url: impl Into<String>) -> Self {
        Self {
            base_url: base_url.into(),
            ..Default::default()
        }
    }

    /// Set the API key
    pub fn with_api_key(mut self, api_key: impl Into<String>) -> Self {
        self.api_key = Some(api_key.into());
        self
    }

    /// Set the timeout
    pub fn with_timeout(mut self, timeout: Duration) -> Self {
        self.timeout = timeout;
        self
    }

    /// Set a custom user agent
    pub fn with_user_agent(mut self, user_agent: impl Into<String>) -> Self {
        self.user_agent = user_agent.into();
        self
    }
}

/// Internal client data wrapped in Arc for cheap cloning
#[derive(Debug)]
struct ClientInner {
    config: Config,
    http: reqwest::Client,
}

/// Client for making requests to the Immich API
///
/// This struct is cheap to clone - it uses an internal Arc to share the underlying
/// HTTP client and configuration.
#[derive(Debug, Clone)]
pub struct Client {
    inner: Arc<ClientInner>,
}

impl Client {
    /// Create a new client with the given configuration
    pub fn new(config: Config) -> Result<Self> {
        // Validate base URL
        let base_url = if config.base_url.ends_with('/') {
            config.base_url.trim_end_matches('/').to_string()
        } else {
            config.base_url.clone()
        };

        if base_url.is_empty() {
            return Err(ImmichError::Config("Base URL cannot be empty".to_string()));
        }

        // Parse to validate URL
        let _ = url::Url::parse(&base_url)?;

        let http = reqwest::Client::builder()
            .timeout(config.timeout)
            .user_agent(&config.user_agent)
            .build()?;

        Ok(Self {
            inner: Arc::new(ClientInner {
                config: Config { base_url, ..config },
                http,
            }),
        })
    }

    /// Create a client from a base URL string
    pub fn from_url(base_url: impl Into<String>) -> Result<Self> {
        Self::new(Config::new(base_url))
    }

    /// Set the API key
    pub fn with_api_key(self, api_key: impl Into<String>) -> Self {
        // We need to create a new ClientInner since we can't modify Arc contents
        let mut config = self.inner.config.clone();
        config.api_key = Some(api_key.into());

        Self {
            inner: Arc::new(ClientInner {
                config,
                http: self.inner.http.clone(),
            }),
        }
    }

    /// Get the configuration
    pub fn config(&self) -> &Config {
        &self.inner.config
    }

    /// Get the base URL
    pub fn base_url(&self) -> &str {
        &self.inner.config.base_url
    }

    /// Check if the client has an API key configured
    pub fn has_api_key(&self) -> bool {
        self.inner.config.api_key.is_some()
    }

    /// Get the underlying HTTP client
    pub fn http(&self) -> &reqwest::Client {
        &self.inner.http
    }

    /// Create an authenticated request builder
    pub fn request(&self, method: reqwest::Method, path: &str) -> reqwest::RequestBuilder {
        let url = format!("{}/api{}", self.inner.config.base_url, path);
        let mut builder = self.inner.http.request(method, &url);

        // Add API key authentication
        if let Some(ref api_key) = self.inner.config.api_key {
            builder = builder.header("x-api-key", api_key);
        }

        builder
    }

    /// Execute a request and handle common error cases
    pub async fn execute(&self, request: reqwest::Request) -> Result<reqwest::Response> {
        let response = self.inner.http.execute(request).await?;

        if response.status().is_success() {
            Ok(response)
        } else {
            Err(ImmichError::from_response(response).await)
        }
    }

    /// Make a GET request
    pub fn get(&self, path: &str) -> reqwest::RequestBuilder {
        self.request(reqwest::Method::GET, path)
    }

    /// Make a POST request
    pub fn post(&self, path: &str) -> reqwest::RequestBuilder {
        self.request(reqwest::Method::POST, path)
    }

    /// Make a PUT request
    pub fn put(&self, path: &str) -> reqwest::RequestBuilder {
        self.request(reqwest::Method::PUT, path)
    }

    /// Make a DELETE request
    pub fn delete(&self, path: &str) -> reqwest::RequestBuilder {
        self.request(reqwest::Method::DELETE, path)
    }

    /// Make a PATCH request
    pub fn patch(&self, path: &str) -> reqwest::RequestBuilder {
        self.request(reqwest::Method::PATCH, path)
    }

    /// Access the albums API
    pub fn albums(&self) -> AlbumsApi {
        AlbumsApi::new(self.clone())
    }

    /// Access the assets API
    pub fn assets(&self) -> AssetsApi {
        AssetsApi::new(self.clone())
    }

    /// Access the search API
    pub fn search(&self) -> SearchApi {
        SearchApi::new(self.clone())
    }

    /// Access the server API
    pub fn server(&self) -> ServerApi {
        ServerApi::new(self.clone())
    }

    /// Access the timeline API
    pub fn timeline(&self) -> TimelineApi {
        TimelineApi::new(self.clone())
    }
}

#[cfg(test)]
mod tests {
    use super::*;

    #[test]
    fn test_config_builder() {
        let config = Config::new("https://example.com")
            .with_api_key("test-key")
            .with_timeout(Duration::from_secs(60));

        assert_eq!(config.base_url, "https://example.com");
        assert_eq!(config.api_key, Some("test-key".to_string()));
        assert_eq!(config.timeout, Duration::from_secs(60));
    }

    #[test]
    fn test_client_creation() {
        let client = Client::from_url("https://example.com").unwrap();
        assert_eq!(client.base_url(), "https://example.com");
        assert!(!client.has_api_key());

        let config = Config::new("https://example.com").with_api_key("test-key");
        let client = Client::new(config).unwrap();
        assert!(client.has_api_key());
    }

    #[test]
    fn test_url_normalization() {
        let client = Client::from_url("https://example.com/").unwrap();
        assert_eq!(client.base_url(), "https://example.com");
    }

    #[test]
    fn test_empty_url_error() {
        let result = Client::from_url("");
        assert!(result.is_err());
    }
}