//! Docker container utilities for WatcherAgent
//!
//! Provides functions to list and process Docker containers using the Bollard library.
//!
use crate::docker::stats;
use crate::docker::stats::{ContainerCpuInfo, ContainerNetworkInfo};
use crate::models::DockerContainer;

use bollard::query_parameters::{
    CreateImageOptions, ListContainersOptions, RestartContainerOptions,
};
use bollard::Docker;
use futures_util::StreamExt;
use std::error::Error;

/// Returns a list of available Docker containers.
///
/// # Arguments
/// * `docker` - Reference to a Bollard Docker client.
///
/// # Returns
/// * `Vec<DockerContainer>` - Vector of Docker container info.
pub async fn get_available_containers(docker: &Docker) -> Vec<DockerContainer> {
    println!("=== DOCKER CONTAINER LIST ===");

    let options = Some(ListContainersOptions {
        all: true,
        ..Default::default()
    });

    let containers_list = match docker.list_containers(options).await {
        Ok(containers) => {
            println!("Available containers ({}):", containers.len());
            containers
                .into_iter()
                .filter_map(|container| {
                    container.id.as_ref()?; // Skip if no ID

                    let id = container.id?;
                    let short_id = if id.len() > 12 { &id[..12] } else { &id };

                    let name = container
                        .names
                        .and_then(|names| names.into_iter().next())
                        .map(|name| name.trim_start_matches('/').to_string())
                        .unwrap_or_else(|| "unknown".to_string());

                    let image = container
                        .image
                        .as_ref()
                        .map(|img| img.to_string())
                        .unwrap_or_else(|| "unknown".to_string());

                    Some(DockerContainer {
                        id: short_id.to_string(),
                        image: Some(image),
                        name: Some(name),
                    })
                })
                .collect()
        }
        Err(e) => {
            eprintln!("Failed to list containers: {}", e);
            Vec::new()
        }
    };

    containers_list
}

/// Pulls a new Docker image and restarts the current container.
///
/// # Arguments
/// * `docker` - Reference to a Bollard Docker client.
/// * `image` - The name of the Docker image to pull.
///
/// # Returns
/// * `Result<(), Box<dyn Error + Send + Sync>>` - Ok if updated successfully, error otherwise.
pub async fn update_docker_image(
    docker: &Docker,
    image: &str,
) -> Result<(), Box<dyn Error + Send + Sync>> {
    println!("Updating to {}", image);

    // 1. Pull new image
    let mut stream = docker.create_image(
        Some(CreateImageOptions {
            from_image: Some(image.to_string()),
            ..Default::default()
        }),
        None,
        None,
    );

    // Use the stream with proper trait bounds
    while let Some(result) = StreamExt::next(&mut stream).await {
        match result {
            Ok(progress) => {
                if let Some(status) = progress.status {
                    println!("Pull status: {}", status);
                }
            }
            Err(e) => {
                eprintln!("Error pulling image: {}", e);
                break;
            }
        }
    }

    // 2. Restart the current container
    let options = Some(ListContainersOptions {
        all: true,
        ..Default::default()
    });
    let container_id = docker
        .list_containers(options)
        .await?
        .into_iter()
        .find_map(|c| {
            c.image
                .as_ref()
                .and_then(|img| if img == image { c.id } else { None })
        });
    let _ = restart_container(docker, &container_id.unwrap()).await;

    Ok(())
}

/// Restarts the agent's own Docker container.
///
/// # Arguments
/// * `docker` - Reference to a Bollard Docker client.
///
/// # Returns
/// * `Result<(), Box<dyn Error + Send + Sync>>` - Ok if restarted successfully, error otherwise.
pub async fn restart_container(
    docker: &Docker,
    container_id: &str,
) -> Result<(), Box<dyn Error + Send + Sync>> {
    println!("Restarting container {}", container_id);
    if let Err(e) = docker
        .restart_container(
            &container_id.to_string(),
            Some(RestartContainerOptions {
                signal: None,
                t: Some(0),
            }),
        )
        .await
    {
        eprintln!("Failed to restart container: {}", e);
    }

    Ok(())
}

/*
/// Extracts a Docker container ID from a string line.
///
/// # Arguments
/// * `line` - The input string containing a container ID or related info.
///
/// # Returns
/// * `Option<String>` - The extracted container ID if found.
pub fn extract_client_container_id(line: &str) -> Option<String> {
    // ...existing code...
}
*/

/// Gets network statistics for a specific container
pub async fn get_network_stats(
    docker: &Docker,
    container_id: &str,
) -> Result<ContainerNetworkInfo, Box<dyn Error + Send + Sync>> {
    let (_, net_info, _) = stats::get_single_container_stats(docker, container_id).await?;

    if let Some(net_info) = net_info {
        Ok(net_info)
    } else {
        // Return default network info if not found
        println!("No network info found for container {}", container_id);
        Ok(ContainerNetworkInfo {
            container_id: Some(container_id.to_string()),
            rx_bytes: None,
            tx_bytes: None,
            rx_packets: None,
            tx_packets: None,
            rx_errors: None,
            tx_errors: None,
        })
    }
}

/// Gets CPU statistics for a specific container
pub async fn get_cpu_stats(
    docker: &Docker,
    container_id: &str,
) -> Result<ContainerCpuInfo, Box<dyn Error + Send + Sync>> {
    let (cpu_info, _, _) = stats::get_single_container_stats(docker, container_id).await?;

    if let Some(cpu_info) = cpu_info {
        Ok(cpu_info)
    } else {
        // Return default CPU info if not found
        println!("No CPU info found for container {}", container_id);
        Ok(ContainerCpuInfo {
            container_id: Some(container_id.to_string()),
            cpu_usage_percent: None,
            system_cpu_usage: None,
            container_cpu_usage: None,
            online_cpus: None,
        })
    }
}