use std::fmt;

use crate::durandal::text::*;
use crate::durandal::bin::*;

impl Terminal
{
   pub fn read(b: &[u8]) -> ResultS<(usize, Terminal)>
   {
      const SIZE_HEAD : usize = 10;
      const SIZE_GROUP: usize = 12;
      const SIZE_FACE : usize = 6;

      let len = b.c_u16b(0)? as usize;
      let enc = b.c_u16b(2)? & 1 != 0;
      let lns = b.c_u16b(4)?;
      let gnu = b.c_u16b(6)? as usize;
      let fnu = b.c_u16b(8)? as usize;

      let mut grp = Vec::with_capacity(gnu);
      let mut fcs = Vec::with_capacity(fnu);
      let     end = SIZE_GROUP * gnu + SIZE_FACE * fnu + SIZE_HEAD;

      let mut p = SIZE_HEAD;

      for _ in 0..gnu {
         //  flg = b.c_u16b(p   )?;
         let typ = b.c_u16b(p+ 2)?.into();
         let per = b.c_i16b(p+ 4)?;
         let beg = b.c_u16b(p+ 6)? as usize;
         let len = b.c_u16b(p+ 8)? as usize;
         let lns = b.c_u16b(p+10)?;

         let sta = end + beg;

         let txt = &b[sta..sta+len];
         let txt = if enc {mac_roman_conv(&fuck_string(txt))}
                   else   {mac_roman_conv(&txt)};

         grp.push(Group{typ, per, lns, txt});

         p += SIZE_GROUP;
      }

      for _ in 0..fnu {
         let ind = b.c_u16b(p  )?;
         let fce = b.c_u16b(p+2)?;
         let col = b.c_u16b(p+4)?;

         fcs.push(Face{ind, fce, col});

         p += SIZE_FACE;
      }

      Ok((len, Terminal{enc, lns, grp, fcs}))
   }

   pub fn chunk(b: &[u8]) -> ResultS<Vec<Terminal>>
   {
      let mut v = Vec::new();
      let mut p = 0;

      while p < b.len() {
         let sta = p;

         let (len, trm) = Terminal::read(&b[p..])?;

         v.push(trm);

         p = sta + len;
      }

      Ok(v)
   }
}

#[derive(Debug)]
pub struct Terminal
{
   enc: bool,
   lns: u16,
   grp: Vec<Group>,
   fcs: Vec<Face>,
}

pub struct Face
{
   ind: u16,
   fce: u16,
   col: u16,
}

pub struct Group
{
   typ: Type,
   per: i16,
   lns: u16,
   txt: String,
}

#[derive(Debug)]
pub enum Type
{
   Logon,
   Unfinished,
   Success,
   Failure,
   Information,
   End,
   InterlevelTeleport,
   IntralevelTeleport,
   Checkpoint,
   Sound,
   Movie,
   Track,
   Pict,
   Logoff,
   Camera,
   Static,
   TagActivate,
}

impl From<u16> for Type
{
   fn from(n: u16) -> Self
   {
      match n {
       0 => Type::Logon,
       1 => Type::Unfinished,
       2 => Type::Success,
       3 => Type::Failure,
       4 => Type::Information,
       5 => Type::End,
       6 => Type::InterlevelTeleport,
       7 => Type::IntralevelTeleport,
       8 => Type::Checkpoint,
       9 => Type::Sound,
      10 => Type::Movie,
      11 => Type::Track,
      12 => Type::Pict,
      13 => Type::Logoff,
      14 => Type::Camera,
      15 => Type::Static,
      16 => Type::TagActivate,
       _ => panic!("invalid terminal group type {}", n),
      }
   }
}

impl fmt::Debug for Face
{
   fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result
      {write!(f, "Face{{{} {} {}}}", self.ind, self.fce, self.col)}
}

impl fmt::Debug for Group
{
   fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result
   {
      write!(f, "Group{{{:?} {} {}", self.typ, self.per, self.lns)?;
      if self.txt.len() != 0 {write!(f, ";\n{}\n", self.txt)?}
      write!(f, "}}")
   }
}

// EOF