use crate::meta_plugin::{MetaPlugin, MetaPluginType};

#[derive(Debug, Clone, Default)]
pub struct HostnameMetaPlugin {
    is_finalized: bool,
    outputs: std::collections::HashMap<String, serde_yaml::Value>,
    options: std::collections::HashMap<String, serde_yaml::Value>,
}

impl HostnameMetaPlugin {
    pub fn new(
        options: Option<std::collections::HashMap<String, serde_yaml::Value>>,
        outputs: Option<std::collections::HashMap<String, serde_yaml::Value>>,
    ) -> HostnameMetaPlugin {
        // Start with default options
        let mut final_options = std::collections::HashMap::new();
        // Set default values
        final_options.insert("hostname".to_string(), serde_yaml::Value::String("true".to_string()));
        final_options.insert("hostname_full".to_string(), serde_yaml::Value::Bool(true));
        final_options.insert("hostname_short".to_string(), serde_yaml::Value::Bool(true));
        
        // Override with provided options
        if let Some(opts) = options {
            for (key, value) in opts {
                // Handle "false" string values by converting them to Bool(false)
                if key == "hostname" || key == "hostname_full" || key == "hostname_short" {
                    if let serde_yaml::Value::String(s) = &value {
                        if s == "false" {
                            final_options.insert(key, serde_yaml::Value::Bool(false));
                            continue;
                        } else if s == "true" {
                            final_options.insert(key, serde_yaml::Value::Bool(true));
                            continue;
                        }
                    }
                }
                final_options.insert(key, value);
            }
        }
        
        // Determine which outputs are enabled based on options
        let hostname_enabled = match final_options.get("hostname") {
            Some(serde_yaml::Value::Bool(b)) => *b,
            Some(serde_yaml::Value::String(s)) => match s.as_str() {
                "true" => true,
                "false" => false,
                "full" => true,
                "short" => true,
                _ => true,
            },
            _ => true,
        };
        
        let hostname_full_enabled = final_options.get("hostname_full")
            .and_then(|v| v.as_bool())
            .unwrap_or(true);
            
        let hostname_short_enabled = final_options.get("hostname_short")
            .and_then(|v| v.as_bool())
            .unwrap_or(true);
        
        // Start with default outputs, setting disabled ones to None
        let mut final_outputs = std::collections::HashMap::new();
        
        // Handle hostname output
        if hostname_enabled {
            final_outputs.insert("hostname".to_string(), serde_yaml::Value::String("hostname".to_string()));
        } else {
            final_outputs.insert("hostname".to_string(), serde_yaml::Value::Null);
        }
        
        // Handle hostname_full output
        if hostname_full_enabled {
            final_outputs.insert("hostname_full".to_string(), serde_yaml::Value::String("hostname_full".to_string()));
        } else {
            final_outputs.insert("hostname_full".to_string(), serde_yaml::Value::Null);
        }
        
        // Handle hostname_short output
        if hostname_short_enabled {
            final_outputs.insert("hostname_short".to_string(), serde_yaml::Value::String("hostname_short".to_string()));
        } else {
            final_outputs.insert("hostname_short".to_string(), serde_yaml::Value::Null);
        }
        
        // Override with provided outputs, but only if they're enabled
        if let Some(outs) = outputs {
            for (key, value) in outs {
                // Only add if the output is enabled
                match key.as_str() {
                    "hostname" => if hostname_enabled {
                        final_outputs.insert(key, value);
                    },
                    "hostname_full" => if hostname_full_enabled {
                        final_outputs.insert(key, value);
                    },
                    "hostname_short" => if hostname_short_enabled {
                        final_outputs.insert(key, value);
                    },
                    _ => {
                        final_outputs.insert(key, value);
                    }
                }
            }
        }
        
        HostnameMetaPlugin {
            is_finalized: false,
            outputs: final_outputs,
            options: final_options,
        }
    }
    
    
    fn get_hostname(&self) -> String {
        // First get the short hostname
        let short_hostname = match gethostname::gethostname().into_string() {
            Ok(hostname) => hostname,
            Err(_) => return "unknown".to_string(),
        };
        
        // First try DNS resolution for both IPv4 and IPv6 addresses
        // lookup_host should handle both A and AAAA records
        if let Ok(addrs_iter) = dns_lookup::lookup_host(&short_hostname) {
            // Collect addresses into a Vec to be able to use first()
            let addrs: Vec<std::net::IpAddr> = addrs_iter.collect();
            
            // Try each address (both IPv4 and IPv6)
            for addr in &addrs {
                // Convert to IpAddr for lookup_addr
                let ip_addr = match addr {
                    std::net::IpAddr::V4(ipv4) => std::net::IpAddr::V4(*ipv4),
                    std::net::IpAddr::V6(ipv6) => std::net::IpAddr::V6(*ipv6),
                };
                // Perform reverse lookup for each address
                match dns_lookup::lookup_addr(&ip_addr) {
                    Ok(full_hostname) => {
                        // Only use if it's different from the short hostname and looks like a FQDN
                        if full_hostname != short_hostname && full_hostname.contains('.') {
                            return full_hostname;
                        }
                    }
                    Err(_) => continue,
                }
            }
            
            // If no reverse lookup worked, but we have addresses, try to construct FQDN
            // from the first address's domain if the short hostname is part of a domain
            if let Some(_first_addr) = addrs.first() {
                // For local addresses, we might not get a reverse lookup, so try to infer
                // from the system's domain name
                if let Ok(domain) = std::process::Command::new("domainname").output() {
                    if domain.status.success() {
                        let domain_str = String::from_utf8_lossy(&domain.stdout).trim().to_string();
                        if !domain_str.is_empty() && domain_str != "(none)" {
                            return format!("{}.{}", short_hostname, domain_str);
                        }
                    }
                }
            }
        }
        
        // Fallback: try to get the FQDN using the system's hostname resolution
        // This should give us the full hostname if configured
        if let Ok(full_hostname) = std::process::Command::new("hostname")
            .arg("-f")
            .output()
        {
            if full_hostname.status.success() {
                let full_hostname_str = String::from_utf8_lossy(&full_hostname.stdout).trim().to_string();
                if !full_hostname_str.is_empty() && full_hostname_str != short_hostname {
                    return full_hostname_str;
                }
            }
        }
        
        // Final fallback: return the short hostname
        short_hostname
    }
}

impl MetaPlugin for HostnameMetaPlugin {
    fn is_finalized(&self) -> bool {
        self.is_finalized
    }
    
    fn set_finalized(&mut self, finalized: bool) {
        self.is_finalized = finalized;
    }
    
    fn finalize(&mut self) -> crate::meta_plugin::MetaPluginResponse {
        // If already finalized, don't process again
        if self.is_finalized {
            return crate::meta_plugin::MetaPluginResponse {
                metadata: Vec::new(),
                is_finalized: true,
            };
        }
        
        // Mark as finalized
        self.is_finalized = true;
        
        crate::meta_plugin::MetaPluginResponse {
            metadata: Vec::new(),
            is_finalized: true,
        }
    }

    fn update(&mut self, _data: &[u8]) -> crate::meta_plugin::MetaPluginResponse {
        // If already finalized, don't process more data
        if self.is_finalized {
            return crate::meta_plugin::MetaPluginResponse {
                metadata: Vec::new(),
                is_finalized: true,
            };
        }
        
        crate::meta_plugin::MetaPluginResponse {
            metadata: Vec::new(),
            is_finalized: false,
        }
    }

    fn meta_type(&self) -> MetaPluginType {
        MetaPluginType::Hostname
    }
    
    fn initialize(&mut self) -> crate::meta_plugin::MetaPluginResponse {
        // If already finalized, don't process again
        if self.is_finalized {
            return crate::meta_plugin::MetaPluginResponse {
                metadata: Vec::new(),
                is_finalized: true,
            };
        }
        
        let metadata = Vec::new();
        
        // Get the full hostname
        let full_hostname = self.get_hostname();
        let short_hostname = full_hostname.split('.').next().unwrap_or(&full_hostname).to_string();
        
        // Determine which hostnames to include based on options
        let hostname_enabled = match self.options.get("hostname") {
            Some(serde_yaml::Value::Bool(b)) => *b,
            Some(serde_yaml::Value::String(s)) => match s.as_str() {
                "true" => true,
                "false" => false,
                "full" => true,
                "short" => true,
                _ => true,
            },
            _ => true,
        };
        
        // Ensure that if hostname is explicitly set to false, it's disabled
        // This handles cases where it might be set to "false" string which we converted above
        
        let hostname_full_enabled = self.options.get("hostname_full")
            .and_then(|v| v.as_bool())
            .unwrap_or(true);
            
        let hostname_short_enabled = self.options.get("hostname_short")
            .and_then(|v| v.as_bool())
            .unwrap_or(true);
        
        // Determine which hostname value to use for the 'hostname' output
        let hostname_value = match self.options.get("hostname") {
            Some(serde_yaml::Value::String(s)) => match s.as_str() {
                "full" => full_hostname.clone(),
                "short" => short_hostname.clone(),
                _ => {
                    // For 'true' or any other value, use gethostname()
                    gethostname::gethostname().into_string().unwrap_or_else(|_| "unknown".to_string())
                }
            },
            _ => {
                // Default behavior
                gethostname::gethostname().into_string().unwrap_or_else(|_| "unknown".to_string())
            }
        };
        
        // Update outputs based on enabled status
        // Handle hostname output
        if hostname_enabled {
            if let Some(output_value) = self.outputs.get_mut("hostname") {
                *output_value = serde_yaml::Value::String(hostname_value);
            }
        } else {
            self.outputs.insert("hostname".to_string(), serde_yaml::Value::Null);
        }
        
        // Handle hostname_full output
        if hostname_full_enabled {
            if let Some(output_value) = self.outputs.get_mut("hostname_full") {
                *output_value = serde_yaml::Value::String(full_hostname.clone());
            }
        } else {
            self.outputs.insert("hostname_full".to_string(), serde_yaml::Value::Null);
        }
        
        // Handle hostname_short output
        if hostname_short_enabled {
            if let Some(output_value) = self.outputs.get_mut("hostname_short") {
                *output_value = serde_yaml::Value::String(short_hostname);
            }
        } else {
            self.outputs.insert("hostname_short".to_string(), serde_yaml::Value::Null);
        }
        
        // Mark as finalized since this plugin only needs to run once
        self.is_finalized = true;
        
        crate::meta_plugin::MetaPluginResponse {
            metadata,
            is_finalized: true,
        }
    }
    
    fn outputs(&self) -> &std::collections::HashMap<String, serde_yaml::Value> {
        &self.outputs
    }
    
    fn outputs_mut(&mut self) -> &mut std::collections::HashMap<String, serde_yaml::Value> {
        &mut self.outputs
    }
    
    fn default_outputs(&self) -> Vec<String> {
        vec![
            "hostname".to_string(),
            "hostname_full".to_string(),
            "hostname_short".to_string(),
        ]
    }
    
    
    fn options(&self) -> &std::collections::HashMap<String, serde_yaml::Value> {
        &self.options
    }
    
    fn options_mut(&mut self) -> &mut std::collections::HashMap<String, serde_yaml::Value> {
        &mut self.options
    }
    
}