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//! A bin that calculates the cosinus of a value (in radians).
//!
//! ```text
//!   ┌───[cosinus]───┐
//!  ⇒│input    output│⇒
//!   └───────────────┘
//! ```

use super::{
    sink_names_input, source_names_output, BinBuildEnvironment,
    BinDescription, Calculator, FetchItem, GetCalibration, Item,
    Iteration, Result, Scope, SinkBin, SinkNames, SourceBin, SourceId,
    SourceNames, SourceSinkBinDescription, WriteDotSimple, SINK_INPUT,
    SOURCE_OUTPUT,
};
use crate::error;
use indexmap::IndexSet;

static BIN_TYPE: &str = "cosinus";

/// A bin that calculates the cosinus of a value.
#[derive(Debug)]
pub struct Bin {
    scope: Scope,
    source_input: Box<dyn FetchItem>,
    result_output: Item,
}

impl SinkBin for Bin {}

impl SourceBin for Bin {
    fn get_source_data(&self, source: &SourceId) -> Result<Item> {
        if source.id == SOURCE_OUTPUT {
            Ok(self.result_output.clone())
        } else {
            error::MissingSourceName {
                scope: self.scope.clone(),
                name: source.id.to_string(),
                bin_type: BIN_TYPE.to_string(),
            }
            .fail()
        }
    }
}

impl Calculator for Bin {
    fn calculate(&mut self, _iteration: &Iteration) -> Result<()> {
        let input = self.source_input.fetch_item(&self.scope)?;
        use decorum::Real;

        self.result_output = match input.to_float() {
            Ok(value) => Item::from(value.cos()),
            Err(_) => Item::Nothing,
        };
        Ok(())
    }
}

/// Description for the cosinus bin.
#[derive(Clone, Debug, Serialize, Deserialize)]
pub struct Description;

impl BinDescription for Description {
    type Bin = Bin;

    fn bin_type(&self) -> &'static str {
        BIN_TYPE
    }

    fn check_validity(
        &self,
        _scope: &Scope,
        _get_calibration: &mut dyn GetCalibration,
    ) -> Result<()> {
        Ok(())
    }
}

impl SinkNames for Description {
    fn sink_names(&self) -> IndexSet<String> {
        sink_names_input()
    }
}

impl SourceNames for Description {
    fn source_names(&self) -> Result<IndexSet<String>> {
        Ok(source_names_output())
    }
}

impl SourceSinkBinDescription for Description {
    fn build_bin(
        &self,
        scope: &Scope,
        env: &mut dyn BinBuildEnvironment,
    ) -> Result<Self::Bin> {
        Ok(Bin {
            scope: scope.clone(),
            source_input: env.resolve(SINK_INPUT)?,
            result_output: Item::Nothing,
        })
    }
}

impl WriteDotSimple for Description {}

#[cfg(test)]
mod tests {
    use super::Description;
    use crate::bins::{directsource, verificationsink};
    use crate::Item;
    use crate::{run_bin, Result};
    use indexmap::indexset;

    #[test]
    fn simulate() -> Result<()> {
        let pi = std::f64::consts::PI;
        use crate::Item::*;

        let input = directsource::Description {
            columns: indexset!["input".to_string()],
            rows: vec![
                vec![Nothing],
                vec![Item::from(0f64)],
                vec![Item::from(pi * 2f64)],
                vec![Item::from(pi)],
                vec![Item::from(pi * 0.5f64)],
                vec![Item::from(pi * 1.5f64)],
            ]
            .into(),
        };
        let verification = verificationsink::Description {
            columns: indexset!["output".to_string()],
            expected: vec![
                vec![Nothing],
                vec![Item::from(1f64)],
                vec![Item::from(1f64)],
                vec![Item::from(-1f64)],
                vec![Item::from(0f64)],
                vec![Item::from(0f64)],
            ]
            .into(),
        };

        run_bin(&input, &Description {}, &verification)
    }
}