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//! (Advanced) Keeshond's default logger implementation

use rustc_hash::FxHasher;
use log::{Log, Record, Level, LevelFilter, Metadata, SetLoggerError};

use std::collections::HashSet;
use std::hash::BuildHasherDefault;
use std::sync::{Mutex, Arc};
use std::fmt::{Display, Formatter};

const DEFAULT_MAX_ENTRIES : usize = 4096;
const DEFAULT_MAX_MESSAGE_LENGTH : usize = 4096;
const MAX_SOURCE_LENGTH : usize = 256;

#[derive(Clone)]
pub struct ConsoleHistoryEntry
{
    pub level : Level,
    pub source : String,
    pub message : String
}

impl Default for ConsoleHistoryEntry
{
    fn default() -> Self
    {
        ConsoleHistoryEntry
        {
            level : Level::Trace,
            source : String::new(),
            message : String::new()
        }
    }
}

impl Display for ConsoleHistoryEntry
{
    fn fmt(&self, f: &mut Formatter<'_>) -> std::fmt::Result
    {
        write!(f, "[ {:5} {} ] {}", self.level, self.source, self.message)
    }
}

pub struct ConsoleHistory
{
    entries_ring : Vec<ConsoleHistoryEntry>,
    next_index : usize,
    max_entries : usize,
    max_message_len : usize
}

impl ConsoleHistory
{
    pub(crate) fn new() -> ConsoleHistory
    {
        ConsoleHistory::with_custom_limits(DEFAULT_MAX_ENTRIES, DEFAULT_MAX_MESSAGE_LENGTH)
    }

    pub(crate) fn with_custom_limits(max_entries : usize, max_message_len : usize) -> ConsoleHistory
    {
        let entries_ring = vec![ConsoleHistoryEntry::default(); max_entries];

        ConsoleHistory
        {
            entries_ring,
            next_index : 0,
            max_entries,
            max_message_len
        }
    }

    pub(crate) fn add_message(&mut self, entry : ConsoleHistoryEntry)
    {
        self.entries_ring[self.next_index % self.max_entries] = entry;

        self.next_index += 1;
    }

    pub fn history_min(&self) -> usize
    {
        if self.next_index > self.max_entries
        {
            return self.next_index - self.max_entries;
        }

        0
    }

    pub fn history_max(&self) -> usize
    {
        self.next_index
    }

    pub fn entry(&self, index : usize) -> Option<&ConsoleHistoryEntry>
    {
        if index >= self.history_min() && index < self.history_max()
        {
            return self.entries_ring.get(index % self.max_entries);
        }

        None
    }
}

pub struct DogLog
{
    allowed_packages : HashSet<String, BuildHasherDefault<FxHasher>>,
    history : Arc<Mutex<ConsoleHistory>>
}

fn prefix(text : &str, pos : usize) -> &str
{
    &text[..pos.min(text.len())]
}

impl DogLog
{
    pub fn new(history : Arc<Mutex<ConsoleHistory>>) -> DogLog
    {
        let mut allowed_packages = HashSet::with_hasher(BuildHasherDefault::<FxHasher>::default());
        allowed_packages.insert(String::from("keeshond"));
        allowed_packages.insert(String::from("keeshond_datapack"));
        allowed_packages.insert(String::from("keeshond_treats"));
        
        DogLog
        {
            allowed_packages,
            history
        }
    }
    
    pub fn add_package_filter(&mut self, package_name : String)
    {
        self.allowed_packages.insert(package_name);
    }
    
    pub fn install(self, max_level : LevelFilter) -> Result<(), SetLoggerError>
    {
        let result = log::set_boxed_logger(Box::new(self));
        
        if result.is_ok()
        {
            log::set_max_level(max_level);
        }
        
        result
    }
}

impl Log for DogLog
{
    fn enabled(&self, metadata: &Metadata) -> bool
    {
        let mut target : &str = &metadata.target();
        if let Some(namespacer) = metadata.target().find(':')
        {
            target = prefix(metadata.target(), namespacer);
        }
        
        self.allowed_packages.contains(&String::from(target))
    }
    
    fn log(&self, record : &Record)
    {
        if self.enabled(record.metadata())
        {
            let mut message = record.args().to_string();
            println!("[ {:5} {} ] {}", record.level(), record.target(), message);

            let mut history_borrow = self.history.lock().unwrap();
            message.truncate(history_borrow.max_message_len);
            message.shrink_to_fit();

            history_borrow.add_message(ConsoleHistoryEntry
            {
                level : record.level(),
                source : prefix(record.target(), MAX_SOURCE_LENGTH).to_string(),
                message
            });
        }
    }
    
    fn flush(&self)
    {
    
    }
}