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use rlua::prelude::*;
use serde_json;
use rlua_serde;

pub fn init(lua: &Lua) -> crate::Result<()> {
    // Decode string to a table
    let module = lua.create_table()?;
    module.set("to_table", lua.create_function(|lua, text: String| {
        let doc: serde_json::Value = serde_json::from_str(&text).map_err(LuaError::external)?;
        let lua_value = rlua_serde::to_value(lua, &doc)?;

        Ok(lua_value)
    })?)?;

    // Encode table to a string
    module.set("from_table", lua.create_function(|_, value: LuaValue| {
        let lua_value: serde_json::Value = rlua_serde::from_value(value)?;
        let string = serde_json::to_string(&lua_value).map_err(LuaError::external)?;

        Ok(string)
    })?)?;

    lua.globals().set("json", module)?;

    Ok(())
}