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extern crate serde_cbor;

use super::{
    BinBuildEnvironment, BinDescription, Calculator, FetchItem,
    GetCalibration, Item, Iteration, Result, Scope, SinkBin, SinkNames,
    SinkOnlyBin, SinkOnlyBinDescription,
};
use crate::error;
use indexmap::{IndexMap, IndexSet};
use snafu::ResultExt;
use std;
use std::fs::File;
use std::io::{LineWriter, Write};

static BIN_TYPE: &'static str = "cborsink";

pub struct Bin {
    scope: Scope,

    writer: Box<Write>,

    sources: IndexMap<String, Box<FetchItem>>,
}

impl SinkBin for Bin {}

impl Calculator for Bin {
    fn calculate(&mut self, _iteration: &Iteration) -> Result<()> {
        let items = self
            .sources
            .iter()
            .map(|(s, ds)| {
                ds.fetch_item(&self.scope).map(|d| (s.to_string(), d))
            })
            .collect::<Result<IndexMap<String, Item>>>()?;

        serde_cbor::to_writer(
            &mut self.writer,
            &items.values().collect::<Vec<_>>(),
        )
        .context(error::SerdeCbor)?;
        Ok(())
    }
}

impl SinkOnlyBin for Bin {}

#[derive(Clone, Debug, Serialize, Deserialize)]
pub struct Description {
    pub sinks: IndexSet<String>,
    #[serde(default, skip_serializing_if = "Option::is_none")]
    pub file_path: Option<String>,
}

impl BinDescription for Description {
    type Bin = Bin;

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

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

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

impl SinkOnlyBinDescription for Description {
    fn build_bin(
        &self,
        scope: &Scope,
        env: &mut BinBuildEnvironment,
    ) -> Result<Self::Bin> {
        let mut writer: Box<Write> = if let Some(ref path) = self.file_path
        {
            let file =
                File::create(&path.to_string()).context(error::Io)?;
            Box::new(LineWriter::new(file))
        } else {
            Box::new(LineWriter::new(std::io::stdout()))
        };
        serde_cbor::to_writer(&mut writer, &self.sinks)
            .context(error::SerdeCbor)?;

        Ok(Bin {
            scope: scope.clone(),
            writer,
            sources: self
                .sinks
                .iter()
                .map(|s| env.resolve(s).map(|ds| (s.to_string(), ds)))
                .collect::<Result<IndexMap<_, _>>>()?,
        })
    }
}