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use ffi;

use AsLua;
use AsMutLua;

use Push;
use PushGuard;
use LuaRead;

/// Represents any value that can be stored by Lua
#[derive(Clone, Debug, PartialEq)]
pub enum AnyLuaValue {
    LuaString(String),
    LuaNumber(f64),
    LuaBoolean(bool),
    LuaArray(Vec<(AnyLuaValue, AnyLuaValue)>),
    LuaNil,

    /// The "Other" element is (hopefully) temporary and will be replaced by "Function" and "Userdata".
    /// A panic! will trigger if you try to push a Other.
    LuaOther
}

impl<L> Push<L> for AnyLuaValue where L: AsMutLua {
    fn push_to_lua(self, mut lua: L) -> PushGuard<L> {
        match self {
            AnyLuaValue::LuaString(val) => val.push_to_lua(lua),
            AnyLuaValue::LuaNumber(val) => val.push_to_lua(lua),
            AnyLuaValue::LuaBoolean(val) => val.push_to_lua(lua),
            AnyLuaValue::LuaArray(_val) => unimplemented!(),//val.push_to_lua(lua),   // FIXME: reached recursion limit during monomorphization
            AnyLuaValue::LuaNil => {
                unsafe { ffi::lua_pushnil(lua.as_mut_lua().0); }
                PushGuard { lua: lua, size: 1}
            }, // Use ffi::lua_pushnil.
            AnyLuaValue::LuaOther => panic!("can't push a AnyLuaValue of type Other")
        }
    }
}

impl<L> LuaRead<L> for AnyLuaValue where L: AsLua {
    fn lua_read_at_position(lua: L, index: i32) -> Result<AnyLuaValue, L> {
        let lua = match LuaRead::lua_read_at_position(&lua, index) {
            Ok(v) => return Ok(AnyLuaValue::LuaNumber(v)),
            Err(lua) => lua
        };

        let lua = match LuaRead::lua_read_at_position(&lua, index) {
            Ok(v) => return Ok(AnyLuaValue::LuaBoolean(v)),
            Err(lua) => lua
        };

        let lua = match LuaRead::lua_read_at_position(&lua, index) {
            Ok(v) => return Ok(AnyLuaValue::LuaString(v)),
            Err(lua) => lua
        };

        if unsafe { ffi::lua_isnil(lua.as_lua().0, index) } {
            return Ok(AnyLuaValue::LuaNil);
        }

        /*let _lua = match LuaRead::lua_read_at_position(&lua, index) {
            Ok(v) => return Ok(AnyLuaValue::LuaArray(v)),
            Err(lua) => lua
        };*/

        Ok(AnyLuaValue::LuaOther)
    }
}