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use crate::get_pb;
use crate::runtime::action::keeper::ActionImpl;
use crate::runtime::builder::ForesterBuilder;
use crate::runtime::{RtResult, RuntimeError};
use crate::simulator::actions::SimAction;
use crate::simulator::config::{SimProfile, TracerSimConfig};
use crate::simulator::RtAction;
use crate::simulator::Simulator;
use crate::tracer::{Tracer, TracerConfig};
use std::path::PathBuf;

/// The builder to create a simulator process.
///
/// # Examples
/// ```no_run
/// use std::path::PathBuf;
/// use forester_rs::runtime::builder::ForesterBuilder;
/// use forester_rs::simulator::builder::SimulatorBuilder;
///
/// fn smoke() {
///     let mut sb = SimulatorBuilder::new();
///
///     let root = PathBuf::from("simulator/smoke");
///
///     sb.root(root.clone());
///     sb.profile(PathBuf::from("sim.yaml"));
///     
///     let mut fb = ForesterBuilder::from_fs();
///
///     fb.main_file("main.tree".to_string());
///     fb.root(root);
///
///     sb.forester_builder(fb);
///     
///     let mut sim = sb.build().unwrap();
///     sim.run().unwrap();
/// }
///
/// fn smoke_from_text() {
///     let mut sb = SimulatorBuilder::new();
///
///     let sim = PathBuf::from("simulator/smoke/sim.yaml");
///     let mut fb = ForesterBuilder::from_text();
///     sb.profile(sim);
///     
///     fb.text(
///         r#"
/// import "std::actions"
///
/// root main sequence {
///     store_str("info1", "initial")
///     retryer(task(config = obj), success())
///     store_str("info2","finish")
/// }
///
/// fallback retryer(t:tree, default:tree){
///     retry(5) t(..)
///     fail("just should fail")
///     default(..)
/// }
///
/// impl task(config: object);
///     "#
///         .to_string(),
///     );    
///     sb.forester_builder(fb);
///     let mut sim = sb.build().unwrap();
///     sim.run().unwrap();
/// }
/// ```
#[derive(Default)]
pub struct SimulatorBuilder {
    profile: Option<PathBuf>,
    root: Option<PathBuf>,
    fb: Option<ForesterBuilder>,
}

impl SimulatorBuilder {
    pub fn new() -> Self {
        SimulatorBuilder {
            profile: None,
            fb: None,
            root: None,
        }
    }
    /// Add a simulator profile.
    pub fn profile(&mut self, profile: PathBuf) {
        self.profile = Some(profile);
    }

    /// Add an ForesterBuilder instance.
    /// Use `ForesterBuilder` for that.
    pub fn forester_builder(&mut self, fb: ForesterBuilder) {
        self.fb = Some(fb);
    }
    /// Add the root directory.
    pub fn root(&mut self, root: PathBuf) {
        self.root = Some(root);
    }

    /// Build
    pub fn build(&mut self) -> RtResult<Simulator> {
        let mut fb = self.fb.take().ok_or(RuntimeError::uex(
            "the forester builder is absent".to_string(),
        ))?;

        let profile = if let Some(p) = &self.profile {
            SimProfile::parse_file(&get_pb(p, &self.root.clone())?)?
        } else {
            SimProfile::default()
        };

        let pr = profile.clone();

        if let TracerSimConfig { file, dt_fmt } = profile.config.tracer {
            let cfg = match file {
                None => TracerConfig::in_memory(dt_fmt),
                Some(f) => {
                    TracerConfig::in_file(get_pb(&PathBuf::from(f), &self.root.clone())?, dt_fmt)
                }
            };

            fb.tracer(Tracer::create(cfg)?)
        }

        if let Some(bb_load_path) = profile.config.bb.load {
            fb.bb_load(bb_load_path);
        }

        if let Some(http) = profile.config.http {
            fb.http_serv(http.port);
        }

        for action in profile.actions.iter() {
            let sim_action = SimAction::create(action.stub.as_str(), action.params.clone())?;
            let name = action.name.as_str();

            if sim_action.is_remote() {
                fb.register_remote_action(name, sim_action);
            } else {
                fb.register_sync_action(name, sim_action);
            }
        }

        let forester =
            fb.build_with(|| ActionImpl::Present(RtAction::sync(SimAction::Success(0))))?;
        Ok(Simulator::new(self.root.take(), pr, forester))
    }
}