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/*
    Nyx, blazing fast astrodynamics
    Copyright (C) 2022 Christopher Rabotin <christopher.rabotin@gmail.com>

    This program is free software: you can redistribute it and/or modify
    it under the terms of the GNU Affero General Public License as published
    by the Free Software Foundation, either version 3 of the License, or
    (at your option) any later version.

    This program is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    GNU Affero General Public License for more details.

    You should have received a copy of the GNU Affero General Public License
    along with this program.  If not, see <https://www.gnu.org/licenses/>.
*/

extern crate csv;
extern crate rayon;

use crate::errors::NyxError;
use crate::io::formatter::StateFormatter;
use crate::{Orbit, Spacecraft};
use std::error::Error;
use std::fmt;
use std::fs::File;

pub mod ui;

pub mod trajectory;

mod events;
pub use events::{Event, EventEvaluator};

pub mod objective;
pub mod opti;
pub use opti::optimizer;
pub type ScTraj = trajectory::Traj<Spacecraft>;
pub type Ephemeris = trajectory::Traj<Orbit>;

mod param;
pub use param::StateParameter;

pub use opti::target_variable::{Variable, Vary};

/// A Mission Design handler
pub trait MdHdlr<StateType: Copy>: Send + Sync {
    fn handle(&mut self, state: &StateType);
}

pub struct OrbitStateOutput {
    csv_out: csv::Writer<File>,
    fmtr: StateFormatter,
}

impl OrbitStateOutput {
    pub fn new(fmtr: StateFormatter) -> Result<Self, NyxError> {
        match csv::Writer::from_path(fmtr.filename.clone()) {
            Ok(mut wtr) => {
                wtr.serialize(&fmtr.headers)
                    .expect("could not write headers");
                info!("Saving output to {}", fmtr.filename);

                Ok(Self { csv_out: wtr, fmtr })
            }
            Err(e) => Err(NyxError::ExportError(e.to_string())),
        }
    }
}

impl MdHdlr<Spacecraft> for OrbitStateOutput {
    fn handle(&mut self, state: &Spacecraft) {
        self.csv_out
            .serialize(self.fmtr.fmt(&state.orbit))
            .expect("could not format state");
    }
}

impl MdHdlr<Orbit> for OrbitStateOutput {
    fn handle(&mut self, state: &Orbit) {
        self.csv_out
            .serialize(self.fmtr.fmt(state))
            .expect("could not format state");
    }
}

#[allow(clippy::result_large_err)]
#[derive(Clone, PartialEq, Debug)]
pub enum TargetingError {
    /// Raised if the variables to be adjusted lead to an under-determined of the problem for the targeter
    UnderdeterminedProblem,
    /// Raised if the variables of the problem are incorrectly configured
    VariableError(String),
    /// Raised in case of a targeting frame error
    FrameError(String),
    /// Raised if the targeted was configured with a variable that isn't supported (e.g. a maneuver alpha variable in the multiple shooting)
    UnsupportedVariable(Variable),
    /// Raised when the verification of a solution has failed
    Verification(String),
}

impl fmt::Display for TargetingError {
    // Prints the Keplerian orbital elements with units
    fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
        match self {
            Self::UnderdeterminedProblem => write!(f, "The variables to be adjusted lead to an under-determined of the problem for the targeter"),
            Self::VariableError(e) => write!(f, "Incorrectly configured variable: {e}"),
            Self::FrameError(e) => write!(f, "Frame error in targeter: {e}"),
            Self::UnsupportedVariable(v) => write!(f, "Unsupported variable in problem: {v:?}"),
            Self::Verification(e) => write!(f, "Verification of targeting solution failed: {e}")
        }
    }
}

impl Error for TargetingError {}

impl From<TargetingError> for NyxError {
    fn from(e: TargetingError) -> Self {
        NyxError::Targeter(Box::new(e))
    }
}