use anyhow::Result;
use rusqlite::Connection;

use crate::common::is_binary::is_binary;
use crate::meta_plugin::MetaPlugin;

#[derive(Debug, Clone, Default)]
pub struct BinaryMetaPlugin {
    meta_name: String,
    buffer: Vec<u8>,
    max_buffer_size: usize,
    is_saved: bool,
    item_id: Option<i64>,
    outputs: std::collections::HashMap<String, serde_yaml::Value>,
}

impl BinaryMetaPlugin {
    pub fn new(
        options: Option<std::collections::HashMap<String, serde_yaml::Value>>,
        outputs: Option<std::collections::HashMap<String, serde_yaml::Value>>,
    ) -> BinaryMetaPlugin {
        // Start with default options
        let mut final_options = Self::default_options();
        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_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);
            }
        }
        
        let max_buffer_size = final_options.get("max_buffer_size")
            .and_then(|v| v.as_u64())
            .unwrap_or(4096) as usize;
        
        BinaryMetaPlugin {
            meta_name: "binary".to_string(),
            buffer: Vec::new(),
            max_buffer_size,
            is_saved: false,
            item_id: None,
            outputs: final_outputs,
        }
    }
    
    pub fn new_simple() -> BinaryMetaPlugin {
        Self::new(None, None)
    }
    
    fn save_metadata(&mut self, conn: &Connection) -> Result<()> {
        if !self.is_saved {
            if let Some(item_id) = self.item_id {
                let is_binary_result = is_binary(&self.buffer);
                let value = if is_binary_result { "true".to_string() } else { "false".to_string() };
                
                // Save to database immediately using central output handler
                let _ = self.save_meta(conn, item_id, "binary", value);
                
                self.is_saved = true;
            }
        }
        Ok(())
    }
}

impl MetaPlugin for BinaryMetaPlugin {
    fn is_internal(&self) -> bool {
        true
    }
    
    fn finalize(&mut self, conn: &Connection) -> Result<()> {
        // Save the binary detection result when finalizing, if not already saved
        self.save_metadata(conn)
    }

    fn update(&mut self, data: &[u8], conn: &Connection) {
        // If we've already saved the metadata, no need to collect more data
        if self.is_saved {
            return;
        }
        
        // Calculate how much data we can still accept
        let remaining_capacity = self.max_buffer_size.saturating_sub(self.buffer.len());
        if remaining_capacity > 0 {
            // Determine how much data to copy
            let bytes_to_take = std::cmp::min(data.len(), remaining_capacity);
        
            // Add data to our buffer
            self.buffer.extend_from_slice(&data[..bytes_to_take]);
        }
        
        // If we've reached our buffer limit, save the metadata immediately
        if self.buffer.len() >= self.max_buffer_size {
            let _ = self.save_metadata(conn);
        }
    }

    fn meta_name(&mut self) -> String {
        self.meta_name.clone()
    }
    
    fn initialize(&mut self, _conn: &Connection, item_id: i64) -> Result<()> {
        self.item_id = Some(item_id);
        Ok(())
    }
    
    fn configure_options(&mut self, options: &std::collections::HashMap<String, serde_yaml::Value>) -> Result<()> {
        if let Some(max_buffer_size) = options.get("max_buffer_size") {
            if let Some(size) = max_buffer_size.as_u64() {
                self.max_buffer_size = size as usize;
            }
        }
        Ok(())
    }
    
    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!["binary".to_string()]
    }
    
    fn default_options(&self) -> std::collections::HashMap<String, serde_yaml::Value> {
        let mut options = std::collections::HashMap::new();
        options.insert("max_buffer_size".to_string(), serde_yaml::Value::Number(4096.into()));
        options
    }
}