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use std::fs::File;
use std::io::prelude::*;

use actor::LuaActor;
use rlua::{Error as LuaError, Lua};

pub type InitializeVM = Fn(&Lua) -> Result<(), LuaError>;

pub struct LuaActorBuilder {
    started: Option<String>,
    handle: Option<String>,
    stopped: Option<String>,
    initialize_vm: Option<Box<InitializeVM>>,
}

impl Default for LuaActorBuilder {
    fn default() -> LuaActorBuilder {
        let noop = Some("return".to_string());
        LuaActorBuilder {
            started: noop.clone(),
            handle: noop.clone(),
            stopped: noop.clone(),
            initialize_vm: None,
        }
    }
}

impl LuaActorBuilder {
    pub fn new() -> Self {
        LuaActorBuilder::default()
    }

    pub fn on_started(mut self, filename: &str) -> Self {
        self.started = Some(read_to_string(filename));
        self
    }

    pub fn on_started_with_lua(mut self, script: &str) -> Self {
        self.started = Some(script.to_string());
        self
    }

    pub fn on_handle(mut self, filename: &str) -> Self {
        self.handle = Some(read_to_string(filename));
        self
    }
    pub fn on_handle_with_lua(mut self, script: &str) -> Self {
        self.handle = Some(script.to_string());
        self
    }

    pub fn on_stopped(mut self, filename: &str) -> Self {
        self.stopped = Some(read_to_string(filename));
        self
    }

    pub fn on_stopped_with_lua(mut self, script: &str) -> Self {
        self.stopped = Some(script.to_string());
        self
    }

    pub fn with_vm<F: Fn(&Lua) -> Result<(), LuaError> + 'static>(mut self, callback: F) -> Self {
        self.initialize_vm = Some(Box::new(callback));
        self
    }

    pub fn build(self) -> Result<LuaActor, LuaError> {
        LuaActor::new(
            self.started.clone(),
            self.handle.clone(),
            self.stopped.clone(),
            self.initialize_vm,
        )
    }
}

fn read_to_string(filename: &str) -> String {
    let mut f = File::open(filename).expect("File not found");
    let mut body = String::new();
    f.read_to_string(&mut body).expect("Failed to read file");

    body
}