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use super::logger::RecordInfo;
use super::ser::{SerdeSerializer};
use super::Level;

use super::{BorrowedKeyValue,OwnedKeyValue};
use std::fmt::Write;

use serde_json;
use ansi_term::Colour;

/// Format record information
pub trait Format : Send+Sync+Sized {
    /// Format one logging record into `String`
    fn format(&self, info : &RecordInfo, logger_values : &[OwnedKeyValue], record_values : &[BorrowedKeyValue]) -> String;
}


/// ToJson formatter
///
/// Each record will be printed as a Json map.
pub struct Json {
    newlines : bool,
    values : Vec<OwnedKeyValue>,
}


impl Json {
    /// Create new `Json` format.
    ///
    /// TODO: Add a builder pattern to configure newlines,
    /// and custom records.
    pub fn new() -> Self {
        Json {
            newlines : true,
            values : o!(
                "ts" => |rinfo : &RecordInfo| {
                    rinfo.ts.to_rfc3339()
                },
                "level" => |rinfo : &RecordInfo| {
                    rinfo.level.as_str()
                },
                "msg" => |rinfo : &RecordInfo| {
                    rinfo.msg.clone()
                }
                ).to_vec()
        }
    }

    /// Create new `Json` format that does not add
    /// newlines after each record.
    pub fn new_nonewline() -> Self {
        let mut json = Json::new();
        json.newlines = false;
        json
    }
}

impl Format for Json {
    fn format(&self, rinfo : &RecordInfo, logger_values : &[OwnedKeyValue], record_values : &[BorrowedKeyValue]) -> String {
        let mut serializer = serde_json::Serializer::new(vec!());
        {
            let mut serializer = &mut SerdeSerializer(&mut serializer);
            for &(ref k, ref v) in self.values.iter() {
                v.serialize(rinfo, k, serializer);
            }
            for &(ref k, ref v) in logger_values.iter() {
                v.serialize(rinfo, k, serializer);
            }

            for &(ref k, ref v) in record_values.iter() {
                v.serialize(rinfo, k, serializer);
            }
        }

        // TODO: Optimize this part
        let mut inner_bytes = serializer.into_inner();
        {
            let empty = inner_bytes.is_empty();
            if empty {
                inner_bytes.push(',' as u8);
            }
        }
        let inner_str = String::from_utf8_lossy(&inner_bytes);

        if self.newlines {
            format!("{{{}}}\n", &inner_str[1..])
        } else {
            format!("{{{}}}", &inner_str[1..])
        }
    }
}

/// Terminal formatting with optional color support
pub struct Terminal {
    color : bool,
}

impl Terminal {
    /// New Terminal format that prints using color
    pub fn colored() -> Self {
        Terminal {
            color: true,
        }
    }

    /// New Terminal format that prints without using color
    pub fn plain() -> Self {
        Terminal {
            color: false,
        }
    }
}

fn severity_to_color(lvl : Level) -> u8 {
    match lvl {
        Level::Critical => 35,
        Level::Error => 31,
        Level::Warning => 33,
        Level::Info => 32,
        Level::Debug => 36,
        Level::Trace => 0,
    }
}

impl Format for Terminal {
    fn format(&self, info : &RecordInfo, logger_values : &[OwnedKeyValue], values : &[BorrowedKeyValue]) -> String {
        let color = Colour::Fixed(severity_to_color(info.level));

        let mut s = String::new();

        let _ = write!(s, "{:?}[{}] {}",
               info.ts,
               if self.color {
                   color.paint(info.level.as_str()).to_string()
               } else {
                   info.level.as_str().to_owned()
               },
               info.msg
               );


        for &(ref k, ref v) in logger_values {
            let _ = write!(s, ", ");
            v.serialize(info, k, &mut s);
        }

        for &(k,v) in values {
            let _ = write!(s, ", ");
            v.serialize(info, k, &mut s);
        }

        s.push_str("\n");

        s
    }
}