use anyhow::Result;
use sha2::{Digest, Sha256};
use std::time::Instant;
use rusqlite::Connection;

use crate::meta_plugin::MetaPlugin;

#[derive(Debug, Clone, Default)]
pub struct DigestSha256MetaPlugin {
    hasher: Sha256,
    meta_name: String,
    item_id: Option<i64>,
    outputs: std::collections::HashMap<String, serde_yaml::Value>,
}

impl DigestSha256MetaPlugin {
    pub fn new(
        _options: Option<std::collections::HashMap<String, serde_yaml::Value>>,
        outputs: Option<std::collections::HashMap<String, serde_yaml::Value>>,
    ) -> DigestSha256MetaPlugin {
        // 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);
            }
        }
        
        DigestSha256MetaPlugin {
            hasher: Sha256::new(),
            meta_name: "digest_sha256".to_string(),
            item_id: None,
            outputs: final_outputs,
        }
    }
    
    pub fn new_simple() -> DigestSha256MetaPlugin {
        Self::new(None, None)
    }
}
}

impl MetaPlugin for DigestSha256MetaPlugin {
    fn is_internal(&self) -> bool {
        true
    }
    
    fn initialize(&mut self, _conn: &Connection, item_id: i64) -> Result<()> {
        self.item_id = Some(item_id);
        Ok(())
    }
    
    fn finalize(&mut self, conn: &Connection) -> Result<()> {
        if let Some(item_id) = self.item_id {
            // Finalize the hash
            let hash_result = self.hasher.finalize_reset();
            let hex_string = format!("{:x}", hash_result);
            
            // Save the hash as metadata using central output handler
            let _ = self.save_meta(conn, item_id, "digest_sha256", hex_string);
        }
        Ok(())
    }

    fn update(&mut self, data: &[u8], _conn: &Connection) {
        self.hasher.update(data);
    }

    fn meta_name(&mut self) -> String {
        self.meta_name.clone()
    }
    
    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!["digest_sha256".to_string()]
    }
    
    fn default_options(&self) -> std::collections::HashMap<String, serde_yaml::Value> {
        std::collections::HashMap::new()
    }
}


#[derive(Debug, Clone, Default)]
pub struct ReadTimeMetaPlugin {
    start_time: Option<Instant>,
    meta_name: String,
    outputs: std::collections::HashMap<String, serde_yaml::Value>,
}

impl ReadTimeMetaPlugin {
    pub fn new(
        _options: Option<std::collections::HashMap<String, serde_yaml::Value>>,
        outputs: Option<std::collections::HashMap<String, serde_yaml::Value>>,
    ) -> ReadTimeMetaPlugin {
        // 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);
            }
        }
        
        ReadTimeMetaPlugin {
            start_time: None,
            meta_name: "read_time".to_string(),
            outputs: final_outputs,
        }
    }
    
    pub fn new_simple() -> ReadTimeMetaPlugin {
        Self::new(None, None)
    }
}
}

impl MetaPlugin for ReadTimeMetaPlugin {
    fn is_internal(&self) -> bool {
        true
    }
    
    fn finalize(&mut self, _conn: &Connection) -> Result<()> {
        Ok(())
    }

    fn update(&mut self, _data: &[u8], _conn: &Connection) {
        if self.start_time.is_none() {
            self.start_time = Some(Instant::now());
        }
    }

    fn meta_name(&mut self) -> String {
        self.meta_name.clone()
    }
    
    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!["read_time".to_string()]
    }
    
    fn default_options(&self) -> std::collections::HashMap<String, serde_yaml::Value> {
        std::collections::HashMap::new()
    }
}

#[derive(Debug, Clone, Default)]
pub struct ReadRateMetaPlugin {
    start_time: Option<Instant>,
    bytes_read: u64,
    meta_name: String,
    outputs: std::collections::HashMap<String, serde_yaml::Value>,
}

impl ReadRateMetaPlugin {
    pub fn new(
        _options: Option<std::collections::HashMap<String, serde_yaml::Value>>,
        outputs: Option<std::collections::HashMap<String, serde_yaml::Value>>,
    ) -> ReadRateMetaPlugin {
        // 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);
            }
        }
        
        ReadRateMetaPlugin {
            start_time: None,
            bytes_read: 0,
            meta_name: "read_rate".to_string(),
            outputs: final_outputs,
        }
    }
    
    pub fn new_simple() -> ReadRateMetaPlugin {
        Self::new(None, None)
    }
}
}

impl MetaPlugin for ReadRateMetaPlugin {
    fn is_internal(&self) -> bool {
        true
    }
    
    fn finalize(&mut self, _conn: &Connection) -> Result<()> {
        Ok(())
    }

    fn update(&mut self, data: &[u8], _conn: &Connection) {
        if self.start_time.is_none() {
            self.start_time = Some(Instant::now());
        }
        self.bytes_read += data.len() as u64;
    }

    fn meta_name(&mut self) -> String {
        self.meta_name.clone()
    }
    
    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!["read_rate".to_string()]
    }
    
    fn default_options(&self) -> std::collections::HashMap<String, serde_yaml::Value> {
        std::collections::HashMap::new()
    }
}