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use sdna::SDNA;
use utils;
use std::fmt::{Display, Formatter, Error};
use std::collections::HashMap;
// use fxhash::FxHashMap as HashMap;

#[derive(Debug, Clone)]
pub struct Field{
    type_idx: u16,
    name_idx: u16,
    lookup_name: String,
    name: String,
    type_name: String,
    size: usize,
    array_sizes: Vec<usize>,
    indirection_level: usize,
}

impl Field{
    fn new(type_idx: u16, name_idx: u16, dna: &SDNA) -> Field{
        let type_name = dna.type_name(type_idx);
        let name = dna.name(name_idx);
        let mut array_sizes = vec![];

        let type_size =
            if name.starts_with("*"){
                dna.pointer_bytes()
            }else{
                dna.size_of_type_idx(type_idx) as usize
            };
        let size = if name.ends_with("]"){
            array_sizes = name.split(|c| c==']' || c=='[')
                .filter_map(|part| match part.parse::<usize>(){
                    Ok(dim) => Some(dim),
                    _ => None
                }).collect();
            let total_array_size: usize = array_sizes.iter().fold(1,|acc, size| acc * size);
            type_size * total_array_size
        }else{
            type_size
        };

        let mut indirection_level = 0;
        let mut lookup_name = name.to_string();
        if name.starts_with("*"){
            indirection_level = lookup_name.chars().take_while(|c| *c=='*').count();
            lookup_name = lookup_name[indirection_level..].to_string();
        }
        if name.ends_with("]"){
            let opening_bracket = lookup_name.find('[').unwrap();
            lookup_name = lookup_name.split_at(opening_bracket).0.to_string()
        }

        Field{
            type_idx: type_idx,
            name_idx: name_idx,
            lookup_name: lookup_name,
            name: name.to_string(),
            type_name: type_name.to_string(),
            size: size,
            array_sizes: array_sizes,
            indirection_level: indirection_level,
        }
    }

    pub fn type_name(&self) -> &str{
        &self.type_name
    }

    pub fn name(&self) -> &str{
        &self.lookup_name
    }

    pub fn type_idx(&self) -> u16{
        self.type_idx
    }

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

    pub fn is_ptr(&self) -> bool{
        self.name.starts_with("*")
    }

    pub fn is_array(&self) -> bool{
        self.name.ends_with("]")
    }

    pub fn array_sizes(&self) -> &Vec<usize>{
        &self.array_sizes
    }

    pub fn total_array_size(&self) -> usize{
        if self.array_sizes.is_empty(){
            0
        }else{
            self.array_sizes.iter().fold(1,|acc, size| acc * size)
        }
    }

    pub fn dim(&self) -> usize{
        self.array_sizes.len()
    }

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

#[derive(Debug, Clone)]
pub struct Structure{
    type_idx: u16,
    fields: Vec<Field>,
    name: String,
    size: usize,
    field_index: HashMap<String, usize>,
}

impl Structure{
    pub fn new(data: &[u8], dna: &SDNA) -> Structure{
        let mut chunks = data.chunks(2);
        let type_idx = utils::read_u16(chunks.next().unwrap(), dna.endianness());
        let num_fields = utils::read_u16(chunks.next().unwrap(), dna.endianness());

        let (field_index, fields) = (0..num_fields).map(|f|{
            let field_type = utils::read_u16(chunks.next().unwrap(), dna.endianness());
            let field_name = utils::read_u16(chunks.next().unwrap(), dna.endianness());
            let field = Field::new(field_type, field_name, dna);
            ((field.name().to_string(), f as usize), field)
        }).unzip();

        Structure{
            type_idx: type_idx,
            name: dna.type_name(type_idx).to_string(),
            size: dna.size_of_type_idx(type_idx) as usize,
            fields: fields,
            field_index: field_index,
        }
    }

    pub fn name(&self) -> &str{
        &self.name
    }

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

    pub fn type_idx(&self) -> u16{
        self.type_idx
    }

    pub fn fields(&self) -> &[Field]{
        &self.fields
    }

    pub fn field(&self, name: &str) -> Option<&Field>{
        match self.field_index.get(name){
            Some(&idx) => Some(&self.fields[idx]),
            None => None
        }
    }

    pub fn field_offset(&self, field_name: &str) -> Option<usize>{
        match self.field_index.get(field_name){
            Some(&pos) => Some(self.fields.iter().take(pos).fold(0, |acc, field| acc + field.size())),
            None => None
        }
    }
}

impl Display for Structure{
     fn fmt(&self, f: &mut Formatter) -> Result<(), Error>{
        write!(f, "{} {}\n", self.name, "{")?;
        for field in self.fields.iter(){
            write!(f, "\t{} {};\n", field.type_name, field.name)?;
        }
        write!(f, "{};\n","}")
    }
}