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use crate::header::{class, data, elf_type, machine, osabi, version};
use crate::*;

pub const ELF_MAGIC_NUMBER: u128 = (0x7f45_4c46) << (12 * 8);

#[repr(C)]
pub struct Ehdr64 {
    e_ident: u128,
    e_type: Elf64Half,
    e_machine: Elf64Half,
    e_version: Elf64Word,
    e_entry: Elf64Addr,
    e_phoff: Elf64Off,
    e_shoff: Elf64Off,
    e_flags: Elf64Word,
    e_ehsize: Elf64Half,
    e_phentsize: Elf64Half,
    e_phnum: Elf64Half,
    e_shentsize: Elf64Half,
    e_shnum: Elf64Half,
    e_shstrndx: Elf64Half,
}

impl Default for Ehdr64 {
    fn default() -> Self {
        Self {
            e_ident: ELF_MAGIC_NUMBER,
            e_type: 0,
            e_machine: 0,
            e_version: 0,
            e_entry: 0,
            e_phoff: 0,
            e_shoff: 0,
            e_flags: 0,
            e_ehsize: 0,
            e_phentsize: 0,
            e_phnum: 0,
            e_shentsize: 0,
            e_shnum: 0,
            e_shstrndx: 0,
        }
    }
}

impl Ehdr64 {
    pub fn size() -> Elf64Half {
        0x40
    }

    // getter
    pub fn get_identification(&self) -> u128 {
        self.e_ident
    }
    pub fn get_elf_type(&self) -> elf_type::ELFTYPE {
        elf_type::ELFTYPE::from(self.e_type)
    }
    pub fn get_machine(&self) -> machine::ELFMACHINE {
        machine::ELFMACHINE::from(self.e_machine)
    }
    pub fn get_shstrndx(&self) -> Elf64Half {
        self.e_shstrndx
    }
    pub fn get_shnum(&self) -> Elf64Half {
        self.e_shnum
    }

    // setter
    pub fn set_phoff(&mut self, phoff: Elf64Off) {
        self.e_phoff = phoff;
    }
    pub fn set_shoff(&mut self, shoff: Elf64Off) {
        self.e_shoff = shoff;
    }
    pub fn set_phentsize(&mut self, phentsize: Elf64Half) {
        self.e_phentsize = phentsize;
    }
    pub fn set_shentsize(&mut self, shentsize: Elf64Half) {
        self.e_shentsize = shentsize;
    }
    pub fn set_phnum(&mut self, phnum: Elf64Half) {
        self.e_phnum = phnum;
    }
    pub fn set_shnum(&mut self, shnum: Elf64Half) {
        self.e_shnum = shnum;
    }
    pub fn set_ehsize(&mut self, ehsize: Elf64Half) {
        self.e_ehsize = ehsize;
    }
    pub fn set_shstrndx(&mut self, shstrndx: Elf64Half) {
        self.e_shstrndx = shstrndx;
    }
    pub fn set_class(&mut self, class: class::ELFCLASS) {
        self.e_ident |= class.to_identifier();
    }
    pub fn set_data(&mut self, data: data::ELFDATA) {
        self.e_ident |= data.to_identifier();
    }
    pub fn set_version(&mut self, version: version::ELFVERSION) {
        self.e_ident |= version.to_identifier();
    }
    pub fn set_osabi(&mut self, osabi: osabi::ELFOSABI) {
        self.e_ident |= osabi.to_identifier();
    }
    pub fn set_elf_type(&mut self, e_type: elf_type::ELFTYPE) {
        self.e_type = e_type.to_bytes();
    }
    pub fn set_machine(&mut self, e_machine: machine::ELFMACHINE) {
        self.e_machine = e_machine.to_bytes();
    }

    pub fn to_le_bytes(&self) -> Vec<u8> {
        let mut bytes: Vec<u8> = Vec::new();

        for byte in self.e_ident.to_be_bytes().to_vec() {
            bytes.push(byte);
        }

        for byte in self.e_type.to_le_bytes().to_vec() {
            bytes.push(byte);
        }

        for byte in self.e_machine.to_le_bytes().to_vec() {
            bytes.push(byte);
        }

        for byte in self.e_version.to_le_bytes().to_vec() {
            bytes.push(byte);
        }

        for byte in self.e_entry.to_le_bytes().to_vec() {
            bytes.push(byte);
        }

        for byte in self.e_phoff.to_le_bytes().to_vec() {
            bytes.push(byte);
        }

        for byte in self.e_shoff.to_le_bytes().to_vec() {
            bytes.push(byte);
        }

        for byte in self.e_flags.to_le_bytes().to_vec() {
            bytes.push(byte);
        }

        for byte in self.e_ehsize.to_le_bytes().to_vec() {
            bytes.push(byte);
        }

        for byte in self.e_phentsize.to_le_bytes().to_vec() {
            bytes.push(byte);
        }

        for byte in self.e_phnum.to_le_bytes().to_vec() {
            bytes.push(byte);
        }

        for byte in self.e_shentsize.to_le_bytes().to_vec() {
            bytes.push(byte);
        }

        for byte in self.e_shnum.to_le_bytes().to_vec() {
            bytes.push(byte);
        }

        for byte in self.e_shstrndx.to_le_bytes().to_vec() {
            bytes.push(byte);
        }

        bytes
    }
}