// The MIT License (MIT)
//
// Copyright (c) 2019-2020 A. Orlenko
// Copyright (c) 2014 J.C. Moyer
//
// Permission is hereby granted, free of charge, to any person obtaining a copy
// of this software and associated documentation files (the "Software"), to deal
// in the Software without restriction, including without limitation the rights
// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
// copies of the Software, and to permit persons to whom the Software is
// furnished to do so, subject to the following conditions:
//
// The above copyright notice and this permission notice shall be included in
// all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
// THE SOFTWARE.

//! Contains definitions from `lauxlib.h`.

use std::os::raw::{c_char, c_int, c_long, c_void};
use std::ptr;

use super::lua::{self, lua_CFunction, lua_Integer, lua_Number, lua_State};

#[cfg(any(feature = "lua54", feature = "lua53"))]
pub use super::glue::LUAL_NUMSIZES;

#[cfg(any(feature = "lua52", feature = "lua51", feature = "luajit"))]
pub use super::compat53::{luaL_getmetafield, luaL_newmetatable, luaL_requiref, luaL_tolstring};

#[cfg(any(feature = "lua51", feature = "luajit"))]
pub use super::compat53::{
    luaL_checkstack, luaL_checkversion, luaL_getsubtable, luaL_len, luaL_loadbufferx,
    luaL_setfuncs, luaL_setmetatable, luaL_testudata, luaL_traceback,
};

// extra error code for 'luaL_load'
pub const LUA_ERRFILE: c_int = lua::LUA_ERRERR + 1;

#[repr(C)]
pub struct luaL_Reg {
    pub name: *const c_char,
    pub func: lua_CFunction,
}

#[cfg(any(feature = "lua54", feature = "lua53", feature = "lua52"))]
#[inline(always)]
pub unsafe fn luaL_checkversion(L: *mut lua_State) {
    #[cfg(any(feature = "lua54", feature = "lua53"))]
    luaL_checkversion_(
        L,
        lua::LUA_VERSION_NUM as lua_Number,
        LUAL_NUMSIZES as usize,
    );
    #[cfg(feature = "lua52")]
    luaL_checkversion_(L, lua::LUA_VERSION_NUM as lua_Number);
}

extern "C" {
    #[cfg(any(feature = "lua54", feature = "lua53"))]
    pub fn luaL_checkversion_(L: *mut lua_State, ver: lua_Number, sz: usize);
    #[cfg(feature = "lua52")]
    pub fn luaL_checkversion_(L: *mut lua_State, ver: lua_Number);

    #[cfg(any(feature = "lua54", feature = "lua53"))]
    pub fn luaL_getmetafield(L: *mut lua_State, obj: c_int, e: *const c_char) -> c_int;
    #[cfg(any(feature = "lua52", feature = "lua51", feature = "luajit"))]
    #[link_name = "luaL_getmetafield"]
    pub fn luaL_getmetafield_old(L: *mut lua_State, obj: c_int, e: *const c_char) -> c_int;

    pub fn luaL_callmeta(L: *mut lua_State, obj: c_int, e: *const c_char) -> c_int;
    #[cfg(any(feature = "lua54", feature = "lua53"))]
    pub fn luaL_tolstring(L: *mut lua_State, idx: c_int, len: *mut usize) -> *const c_char;
    pub fn luaL_argerror(L: *mut lua_State, arg: c_int, l: *const c_char) -> c_int;
    pub fn luaL_checklstring(L: *mut lua_State, arg: c_int, l: *mut usize) -> *const c_char;
    pub fn luaL_optlstring(
        L: *mut lua_State,
        arg: c_int,
        def: *const c_char,
        l: *mut usize,
    ) -> *const c_char;
    pub fn luaL_checknumber(L: *mut lua_State, arg: c_int) -> lua_Number;
    pub fn luaL_optnumber(L: *mut lua_State, arg: c_int, def: lua_Number) -> lua_Number;
    pub fn luaL_checkinteger(L: *mut lua_State, arg: c_int) -> lua_Integer;
    pub fn luaL_optinteger(L: *mut lua_State, arg: c_int, def: lua_Integer) -> lua_Integer;

    #[cfg(any(feature = "lua54", feature = "lua53", feature = "lua52"))]
    pub fn luaL_checkstack(L: *mut lua_State, sz: c_int, msg: *const c_char);
    pub fn luaL_checktype(L: *mut lua_State, arg: c_int, t: c_int);
    pub fn luaL_checkany(L: *mut lua_State, arg: c_int);

    #[cfg(any(feature = "lua54", feature = "lua53"))]
    pub fn luaL_newmetatable(L: *mut lua_State, tname: *const c_char) -> c_int;
    #[cfg(any(feature = "lua52", feature = "lua51", feature = "luajit"))]
    #[link_name = "luaL_newmetatable"]
    pub fn luaL_newmetatable_old(L: *mut lua_State, tname: *const c_char) -> c_int;

    #[cfg(any(feature = "lua54", feature = "lua53", feature = "lua52"))]
    pub fn luaL_setmetatable(L: *mut lua_State, tname: *const c_char);
    #[cfg(any(feature = "lua54", feature = "lua53", feature = "lua52"))]
    pub fn luaL_testudata(L: *mut lua_State, ud: c_int, tname: *const c_char) -> *mut c_void;
    pub fn luaL_checkudata(L: *mut lua_State, ud: c_int, tname: *const c_char) -> *mut c_void;

    pub fn luaL_where(L: *mut lua_State, lvl: c_int);
    pub fn luaL_error(L: *mut lua_State, fmt: *const c_char, ...) -> !;

    // TODO: test this
    pub fn luaL_checkoption(
        L: *mut lua_State,
        arg: c_int,
        def: *const c_char,
        lst: *const *const c_char,
    ) -> c_int;

    #[cfg(any(feature = "lua54", feature = "lua53", feature = "lua52"))]
    pub fn luaL_fileresult(L: *mut lua_State, stat: c_int, fname: *const c_char) -> c_int;
    #[cfg(any(feature = "lua54", feature = "lua53", feature = "lua52"))]
    pub fn luaL_execresult(L: *mut lua_State, stat: c_int) -> c_int;
}

// pre-defined references
pub const LUA_NOREF: c_int = -2;
pub const LUA_REFNIL: c_int = -1;

extern "C" {
    pub fn luaL_ref(L: *mut lua_State, t: c_int) -> c_int;
    pub fn luaL_unref(L: *mut lua_State, t: c_int, r: c_int);

    #[cfg(any(feature = "lua54", feature = "lua53", feature = "lua52"))]
    pub fn luaL_loadfilex(L: *mut lua_State, filename: *const c_char, mode: *const c_char)
        -> c_int;
    #[cfg(any(feature = "lua51", feature = "luajit"))]
    pub fn luaL_loadfile(L: *mut lua_State, filename: *const c_char) -> c_int;
}

#[cfg(any(feature = "lua54", feature = "lua53", feature = "lua52"))]
#[inline(always)]
pub unsafe fn luaL_loadfile(L: *mut lua_State, f: *const c_char) -> c_int {
    luaL_loadfilex(L, f, ptr::null())
}

extern "C" {
    #[cfg(any(feature = "lua54", feature = "lua53", feature = "lua52"))]
    pub fn luaL_loadbufferx(
        L: *mut lua_State,
        buff: *const c_char,
        sz: usize,
        name: *const c_char,
        mode: *const c_char,
    ) -> c_int;
    #[cfg(any(feature = "lua51", feature = "luajit"))]
    pub fn luaL_loadbuffer(
        L: *mut lua_State,
        buff: *const c_char,
        sz: usize,
        name: *const c_char,
    ) -> c_int;
    pub fn luaL_loadstring(L: *mut lua_State, s: *const c_char) -> c_int;

    pub fn luaL_newstate() -> *mut lua_State;

    #[cfg(any(feature = "lua54", feature = "lua53", feature = "lua52"))]
    pub fn luaL_len(L: *mut lua_State, idx: c_int) -> lua_Integer;

    // TODO (lua54): luaL_addgsub

    pub fn luaL_gsub(
        L: *mut lua_State,
        s: *const c_char,
        p: *const c_char,
        r: *const c_char,
    ) -> *const c_char;

    #[cfg(any(feature = "lua54", feature = "lua53", feature = "lua52"))]
    pub fn luaL_setfuncs(L: *mut lua_State, l: *const luaL_Reg, nup: c_int);

    #[cfg(any(feature = "lua54", feature = "lua53", feature = "lua52"))]
    pub fn luaL_getsubtable(L: *mut lua_State, idx: c_int, fname: *const c_char) -> c_int;

    #[cfg(any(feature = "lua54", feature = "lua53", feature = "lua52"))]
    pub fn luaL_traceback(L: *mut lua_State, L1: *mut lua_State, msg: *const c_char, level: c_int);

    // Skip Lua 5.2 implementation in favor of the compat53 one
    #[cfg(any(feature = "lua54", feature = "lua53"))]
    pub fn luaL_requiref(
        L: *mut lua_State,
        modname: *const c_char,
        openf: lua_CFunction,
        glb: c_int,
    );
}

#[inline(always)]
#[allow(unused_variables)]
pub unsafe fn luaL_newlibtable(L: *mut lua_State, l: *const luaL_Reg) {
    // TODO: figure out how to pass an appropriate hint for the second param
    // this involves correcting the second parameter's type; in C this is
    // sizeof(l)/sizeof(l[0])
    lua::lua_createtable(L, 0, 0)
}

#[inline(always)]
pub unsafe fn luaL_newlib(L: *mut lua_State, l: *const luaL_Reg) {
    luaL_checkversion(L);
    luaL_newlibtable(L, l);
    luaL_setfuncs(L, l, 0)
}

#[inline(always)]
pub unsafe fn luaL_argcheck(L: *mut lua_State, cond: c_int, arg: c_int, extramsg: *const c_char) {
    if cond == 0 {
        luaL_argerror(L, arg, extramsg);
    }
}

#[inline(always)]
pub unsafe fn luaL_checkstring(L: *mut lua_State, n: c_int) -> *const c_char {
    luaL_checklstring(L, n, ptr::null_mut())
}

#[inline(always)]
pub unsafe fn luaL_optstring(L: *mut lua_State, n: c_int, d: *const c_char) -> *const c_char {
    luaL_optlstring(L, n, d, ptr::null_mut())
}

// From 5.3 user manual:
// Macros to project non-default integer types (luaL_checkint, luaL_optint,
// luaL_checklong, luaL_optlong) were deprecated. Use their equivalent over
// lua_Integer with a type cast (or, when possible, use lua_Integer in your
// code).
#[inline(always)]
//#[deprecated]
pub unsafe fn luaL_checkint(L: *mut lua_State, n: c_int) -> c_int {
    luaL_checkinteger(L, n) as c_int
}

#[inline(always)]
//#[deprecated]
pub unsafe fn luaL_optint(L: *mut lua_State, n: c_int, d: c_int) -> c_int {
    luaL_optinteger(L, n, d as lua_Integer) as c_int
}

#[inline(always)]
//#[deprecated]
pub unsafe fn luaL_checklong(L: *mut lua_State, n: c_int) -> c_long {
    luaL_checkinteger(L, n) as c_long
}

#[inline(always)]
//#[deprecated]
pub unsafe fn luaL_optlong(L: *mut lua_State, n: c_int, d: c_long) -> c_long {
    luaL_optinteger(L, n, d as lua_Integer) as c_long
}

#[inline(always)]
pub unsafe fn luaL_typename(L: *mut lua_State, i: c_int) -> *const c_char {
    lua::lua_typename(L, lua::lua_type(L, i))
}

#[inline(always)]
pub unsafe fn luaL_dofile(L: *mut lua_State, filename: *const c_char) -> c_int {
    let status = luaL_loadfile(L, filename);
    if status == 0 {
        lua::lua_pcall(L, 0, lua::LUA_MULTRET, 0)
    } else {
        status
    }
}

#[inline(always)]
pub unsafe fn luaL_dostring(L: *mut lua_State, s: *const c_char) -> c_int {
    let status = luaL_loadstring(L, s);
    if status == 0 {
        lua::lua_pcall(L, 0, lua::LUA_MULTRET, 0)
    } else {
        status
    }
}

#[inline(always)]
pub unsafe fn luaL_getmetatable(L: *mut lua_State, n: *const c_char) {
    lua::lua_getfield(L, lua::LUA_REGISTRYINDEX, n);
}

// luaL_opt would be implemented here but it is undocumented, so it's omitted

#[cfg(any(feature = "lua54", feature = "lua53", feature = "lua52"))]
#[inline(always)]
pub unsafe fn luaL_loadbuffer(
    L: *mut lua_State,
    s: *const c_char,
    sz: usize,
    n: *const c_char,
) -> c_int {
    luaL_loadbufferx(L, s, sz, n, ptr::null())
}

// TODO: Add buffer API

// omitted: old module system compatibility (removed in 5.4)