use ratatui::layout::Rect;
use ratatui::Frame;

use crate::app::HostDisplayData;
use crate::data::metrics::ServiceStatus;
use crate::ui::widget::{render_placeholder, render_widget_data, status_level_from_agent_status, connection_status_message, WidgetData, WidgetStatus, StatusLevel};
use crate::app::ConnectionStatus;

pub fn render(frame: &mut Frame, host: Option<&HostDisplayData>, area: Rect) {
    match host {
        Some(data) => {
            match (&data.connection_status, data.services.as_ref()) {
                (ConnectionStatus::Connected, Some(metrics)) => {
                    render_metrics(frame, data, metrics, area);
                }
                (ConnectionStatus::Connected, None) => {
                    render_placeholder(
                        frame,
                        area,
                        "Services",
                        &format!("Host {} has no service metrics yet", data.name),
                    );
                }
                (status, _) => {
                    render_placeholder(
                        frame,
                        area,
                        "Services",
                        &format!("Host {}: {}", data.name, connection_status_message(status, &data.last_error)),
                    );
                }
            }
        }
        None => render_placeholder(frame, area, "Services", "No hosts configured"),
    }
}

fn render_metrics(
    frame: &mut Frame,
    _host: &HostDisplayData,
    metrics: &crate::data::metrics::ServiceMetrics,
    area: Rect,
) {
    let summary = &metrics.summary;
    let title = "Services".to_string();

    // Use agent-calculated services status
    let widget_status = status_level_from_agent_status(summary.services_status.as_ref());
    
    let mut data = WidgetData::new(
        title, 
        Some(WidgetStatus::new(widget_status)),
        vec!["Service".to_string(), "RAM".to_string(), "CPU".to_string(), "Disk".to_string()]
    );


    if metrics.services.is_empty() {
        data.add_row(
            None,
            vec![],
            vec![
                "No services reported".to_string(),
                "".to_string(),
                "".to_string(),
                "".to_string(),
            ],
        );
        render_widget_data(frame, area, data);
        return;
    }

    let mut services = metrics.services.clone();
    services.sort_by(|a, b| {
        // First, determine the primary service name for grouping
        let primary_a = a.sub_service.as_ref().unwrap_or(&a.name);
        let primary_b = b.sub_service.as_ref().unwrap_or(&b.name);
        
        // Sort by primary service name first
        match primary_a.cmp(primary_b) {
            std::cmp::Ordering::Equal => {
                // Same primary service, put parent service first, then sub-services alphabetically
                match (a.sub_service.as_ref(), b.sub_service.as_ref()) {
                    (None, Some(_)) => std::cmp::Ordering::Less,    // Parent comes before sub-services
                    (Some(_), None) => std::cmp::Ordering::Greater, // Sub-services come after parent
                    _ => a.name.cmp(&b.name),                       // Both same type, sort by name
                }
            }
            other => other, // Different primary services, sort alphabetically
        }
    });

    for svc in services {
        let status_level = match svc.status {
            ServiceStatus::Running => StatusLevel::Ok,
            ServiceStatus::Degraded => StatusLevel::Warning,
            ServiceStatus::Restarting => StatusLevel::Warning,
            ServiceStatus::Stopped => StatusLevel::Error,
        };
        
        // Service row with optional description(s)
        let description = if let Some(desc_vec) = &svc.description {
            desc_vec.clone()
        } else {
            vec![]
        };
        
        if svc.sub_service.is_some() {
            // Sub-services only show name and status, no memory/CPU/disk/sandbox data
            data.add_row_with_sub_service(
                Some(WidgetStatus::new(status_level)),
                description,
                vec![
                    svc.name.clone(),
                    "".to_string(),
                    "".to_string(),
                    "".to_string(),
                ],
                svc.sub_service.clone(),
            );
        } else {
            // Regular services show all columns
            data.add_row(
                Some(WidgetStatus::new(status_level)),
                description,
                vec![
                    svc.name.clone(),
                    format_memory_value(svc.memory_used_mb, svc.memory_quota_mb),
                    format_cpu_value(svc.cpu_percent),
                    format_disk_value(svc.disk_used_gb, svc.disk_quota_gb),
                ],
            );
        }
    }

    render_widget_data(frame, area, data);
}



fn format_bytes(mb: f32) -> String {
    if mb < 0.1 {
        "0".to_string()
    } else if mb < 1.0 {
        format!("{:.0}kB", mb * 1000.0)
    } else if mb < 1000.0 {
        format!("{:.0}MB", mb)
    } else {
        format!("{:.1}GB", mb / 1000.0)
    }
}

fn format_memory_value(used: f32, quota: f32) -> String {
    let used_value = format_bytes(used);
    
    if quota > 0.05 {
        let quota_gb = quota / 1000.0;
        // Format quota without decimals and use GB
        format!("{} ({}GB)", used_value, quota_gb as u32)
    } else {
        used_value
    }
}

fn format_cpu_value(cpu_percent: f32) -> String {
    if cpu_percent >= 0.1 {
        format!("{:.1}", cpu_percent)
    } else {
        "0.0".to_string()
    }
}

fn format_disk_value(used: f32, quota: f32) -> String {
    let used_value = format_bytes(used * 1000.0); // Convert GB to MB for format_bytes
    
    if quota > 0.05 {
        // Format quota without decimals and use GB (round to nearest GB)
        format!("{} ({}GB)", used_value, quota.round() as u32)
    } else {
        used_value
    }
}