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use std::ffi::c_void;

use super::strings;
use crate::version;

#[repr(C)]
#[derive(Copy, Clone, PartialEq, Eq, Hash)]
pub struct MiscId(u32);

#[repr(C)]
#[derive(Copy, Clone, PartialEq, Eq, Hash)]
pub struct BytecodeId(u32);

#[repr(C)]
#[derive(Copy, Clone, PartialEq, Eq, Hash)]
pub struct LocalsId(u32);

#[repr(C)]
#[derive(Copy, Clone, PartialEq, Eq, Hash)]
pub struct ParametersId(u32);

pub trait AsMiscId {
	fn as_misc_id(&self) -> MiscId;
}

impl AsMiscId for BytecodeId {
	fn as_misc_id(&self) -> MiscId {
		MiscId(self.0)
	}
}

impl AsMiscId for LocalsId {
	fn as_misc_id(&self) -> MiscId {
		MiscId(self.0)
	}
}

impl AsMiscId for ParametersId {
	fn as_misc_id(&self) -> MiscId {
		MiscId(self.0)
	}
}

#[repr(C)]
#[derive(Copy, Clone)]
pub struct Bytecode_V1 {
	pub count: u16,
	pub bytecode: *mut u32,
}

#[repr(C)]
#[derive(Copy, Clone)]
pub struct Bytecode_V2 {
	pub count: u16,
	unk_0: u32,
	pub bytecode: *mut u32,
}

#[repr(C)]
#[derive(Copy, Clone)]
pub struct Locals_V1 {
	pub count: u16,
	pub names: *const strings::VariableId,
}

#[repr(C)]
#[derive(Copy, Clone)]
pub struct Locals_V2 {
	pub count: u16,
	unk_0: u32,
	pub names: *const strings::VariableId,
}

#[repr(C)]
#[derive(Copy, Clone)]
pub struct Parameters_V1 {
	params_count_mul_4: u16,
	pub data: *const ParametersData,
}

#[repr(C)]
#[derive(Copy, Clone)]
pub struct Parameters_V2 {
	params_count_mul_4: u16,
	unk_0: u32,
	pub data: *const ParametersData,
}

#[repr(C)]
#[derive(Copy, Clone)]
pub union Misc_V1 {
	pub bytecode: Bytecode_V1,
	pub locals: Locals_V1,
	pub parameters: Parameters_V1,
}

#[repr(C)]
#[derive(Copy, Clone)]
pub union Misc_V2 {
	pub bytecode: Bytecode_V2,
	pub locals: Locals_V2,
	pub parameters: Parameters_V2,
}

#[repr(C)]
pub struct ParametersData {
	unk_0: u32,
	unk_1: u32,
	pub name: strings::VariableId,
	unk_4: u32,
}

impl Parameters_V1 {
	pub fn count(&self) -> usize {
		(self.params_count_mul_4 / 4) as usize
	}
}

impl Parameters_V2 {
	pub fn count(&self) -> usize {
		(self.params_count_mul_4 / 4) as usize
	}
}

pub fn set_bytecode(id: BytecodeId, new_bytecode: *mut u32, new_bytecode_count: u16) {
	let mut misc: *mut c_void = std::ptr::null_mut();
	unsafe {
		assert_eq!(super::funcs::get_misc_by_id(&mut misc, id.as_misc_id()), 1);
	}

	let (major, minor) = version::get();

	// Lame
	if major > 513 || minor >= 1539 {
		let misc = misc as *mut Misc_V2;
		unsafe {
			(*misc).bytecode.bytecode = new_bytecode;
			(*misc).bytecode.count = new_bytecode_count;
		}
	}

	let misc = misc as *mut Misc_V1;
	unsafe {
		(*misc).bytecode.bytecode = new_bytecode;
		(*misc).bytecode.count = new_bytecode_count;
	}
}

pub fn get_bytecode(id: BytecodeId) -> (*mut u32, u16) {
	let mut misc: *mut c_void = std::ptr::null_mut();
	unsafe {
		assert_eq!(super::funcs::get_misc_by_id(&mut misc, id.as_misc_id()), 1);
	}

	let (major, minor) = version::get();

	// Lame
	if major > 513 || minor >= 1539 {
		let misc = misc as *mut Misc_V2;
		return unsafe { ((*misc).bytecode.bytecode, (*misc).bytecode.count) };
	}

	let misc = misc as *mut Misc_V1;
	unsafe { ((*misc).bytecode.bytecode, (*misc).bytecode.count) }
}

pub fn get_locals(id: LocalsId) -> (*const strings::VariableId, usize) {
	let mut misc: *mut c_void = std::ptr::null_mut();
	unsafe {
		assert_eq!(super::funcs::get_misc_by_id(&mut misc, id.as_misc_id()), 1);
	}

	let (major, minor) = version::get();

	// Lame
	if major > 513 || minor >= 1539 {
		let misc = misc as *mut Misc_V2;
		return unsafe { ((*misc).locals.names, (*misc).locals.count as usize) };
	}

	let misc = misc as *mut Misc_V1;
	unsafe { ((*misc).locals.names, (*misc).locals.count as usize) }
}

pub fn get_parameters(id: ParametersId) -> (*const ParametersData, usize) {
	let mut misc: *mut c_void = std::ptr::null_mut();
	unsafe {
		assert_eq!(super::funcs::get_misc_by_id(&mut misc, id.as_misc_id()), 1);
	}

	let (major, minor) = version::get();

	// Lame
	if major > 513 || minor >= 1539 {
		let misc = misc as *mut Misc_V2;
		return unsafe { ((*misc).parameters.data, (*misc).parameters.count()) };
	}

	let misc = misc as *mut Misc_V1;
	unsafe { ((*misc).parameters.data, (*misc).parameters.count()) }
}