use serde::{Deserialize, Serialize};
use std::collections::HashMap;
use std::path::PathBuf;
use std::process::Command;

#[derive(Debug, Serialize, Deserialize)]
pub struct DiagnosticResult {
    pub component: String,
    pub status: DiagnosticStatus,
    pub message: String,
    pub suggestions: Vec<String>,
}

#[derive(Debug, Serialize, Deserialize)]
pub enum DiagnosticStatus {
    OK,
    Warning,
    Error,
}

#[tauri::command]
pub async fn run_diagnostic(component: String) -> Result<DiagnosticResult, String> {
    match component.as_str() {
        "database" => run_database_diagnostic().await,
        "web_server" => run_web_server_diagnostic().await,
        "ssh" => run_ssh_diagnostic().await,
        "nfs" => run_nfs_diagnostic().await,
        "smb" => run_smb_diagnostic().await,
        _ => Err(format!("Unknown component: {}", component)),
    }
}

#[tauri::command]
pub async fn run_full_diagnostic() -> Result<HashMap<String, DiagnosticResult>, String> {
    let mut results = HashMap::new();
    
    results.insert("database".to_string(), run_database_diagnostic().await?);
    results.insert("web_server".to_string(), run_web_server_diagnostic().await?);
    results.insert("ssh".to_string(), run_ssh_diagnostic().await?);
    results.insert("nfs".to_string(), run_nfs_diagnostic().await?);
    results.insert("smb".to_string(), run_smb_diagnostic().await?);
    
    Ok(results)
}

#[tauri::command]
pub async fn apply_diagnostic_repairs(suggestions: Vec<String>) -> Result<(), String> {
    for suggestion in suggestions {
        println!("Applying repair: {}", suggestion);
    }
    Ok(())
}

async fn run_database_diagnostic() -> Result<DiagnosticResult, String> {
    let db_path = PathBuf::from("data/users/demo.sqlite");
    
    if db_path.exists() {
        Ok(DiagnosticResult {
            component: "database".to_string(),
            status: DiagnosticStatus::OK,
            message: "Database file exists and accessible".to_string(),
            suggestions: vec![],
        })
    } else {
        Ok(DiagnosticResult {
            component: "database".to_string(),
            status: DiagnosticStatus::Error,
            message: "Database file not found".to_string(),
            suggestions: vec![
                "Run database initialization to create the database".to_string(),
            ],
        })
    }
}

async fn run_web_server_diagnostic() -> Result<DiagnosticResult, String> {
    let output = Command::new("lsof")
        .args(&["-i", ":11438"])
        .output();
    
    match output {
        Ok(output) => {
            if output.status.success() && !output.stdout.is_empty() {
                Ok(DiagnosticResult {
                    component: "web_server".to_string(),
                    status: DiagnosticStatus::OK,
                    message: "Web server is running on port 11438".to_string(),
                    suggestions: vec![],
                })
            } else {
                Ok(DiagnosticResult {
                    component: "web_server".to_string(),
                    status: DiagnosticStatus::Warning,
                    message: "Web server is not running on port 11438".to_string(),
                    suggestions: vec![
                        "Start the web server using 'cargo run -- display'".to_string(),
                    ],
                })
            }
        }
        Err(e) => {
            Ok(DiagnosticResult {
                component: "web_server".to_string(),
                status: DiagnosticStatus::Error,
                message: format!("Failed to check web server status: {}", e),
                suggestions: vec![],
            })
        }
    }
}

async fn run_ssh_diagnostic() -> Result<DiagnosticResult, String> {
    Ok(DiagnosticResult {
        component: "ssh".to_string(),
        status: DiagnosticStatus::OK,
        message: "SSH server is not configured".to_string(),
        suggestions: vec![
            "Configure SSH server in the settings".to_string(),
        ],
    })
}

async fn run_nfs_diagnostic() -> Result<DiagnosticResult, String> {
    Ok(DiagnosticResult {
        component: "nfs".to_string(),
        status: DiagnosticStatus::OK,
        message: "NFS server is not configured".to_string(),
        suggestions: vec![
            "Configure NFS server in the settings".to_string(),
        ],
    })
}

async fn run_smb_diagnostic() -> Result<DiagnosticResult, String> {
    Ok(DiagnosticResult {
        component: "smb".to_string(),
        status: DiagnosticStatus::OK,
        message: "SMB server is not configured".to_string(),
        suggestions: vec![
            "Configure SMB server in the settings".to_string(),
        ],
    })
}