use std::process;
use crate::meta_plugin::MetaPlugin;

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

impl KeepPidMetaPlugin {
    pub fn new(
        _options: Option<std::collections::HashMap<String, serde_yaml::Value>>,
        outputs: Option<std::collections::HashMap<String, serde_yaml::Value>>,
    ) -> KeepPidMetaPlugin {
        // Start with default options
        let mut final_options = std::collections::HashMap::new();
        if let Some(opts) = _options {
            for (key, value) in opts {
                final_options.insert(key, value);
            }
        }
        
        // Start with default outputs
        let mut final_outputs = std::collections::HashMap::new();
        let default_outputs = Self::default().default_outputs();
        for output_name in default_outputs {
            final_outputs.insert(output_name.clone(), serde_yaml::Value::String(output_name));
        }
        if let Some(outs) = outputs {
            for (key, value) in outs {
                final_outputs.insert(key, value);
            }
        }
        
        KeepPidMetaPlugin {
            meta_name: "keep_pid".to_string(),
            is_finalized: false,
            outputs: final_outputs,
            options: final_options,
        }
    }
    
    pub fn new_simple() -> KeepPidMetaPlugin {
        Self::new(None, None)
    }
}

impl MetaPlugin for KeepPidMetaPlugin {
    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_name(&self) -> String {
        self.meta_name.clone()
    }
    
    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 mut metadata = Vec::new();
        let pid = process::id().to_string();
        
        // Use process_metadata_outputs to handle output mapping
        if let Some(meta_data) = crate::meta_plugin::process_metadata_outputs(
            "keep_pid", 
            pid, 
            &self.outputs
        ) {
            metadata.push(meta_data);
        }
        
        // 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!["keep_pid".to_string()]
    }
    
    fn default_options(&self) -> std::collections::HashMap<String, serde_yaml::Value> {
        std::collections::HashMap::new()
    }
    
    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
    }
}