use std::collections::HashMap;
use colored::*;
use std::time;

#[derive(Debug, Default, Serialize, Deserialize)]
pub struct EvalOptions {
  pub execution_method: ExecutionMethod,
}

#[derive(Debug, Serialize, Deserialize)]
pub enum ExecutionMethod {
  Compile,
  Interpret,
}

impl Default for ExecutionMethod {
  fn default() -> ExecutionMethod {
    ExecutionMethod::Interpret
  }
}

pub trait ProgrammingLanguageInterface {
  fn get_language_name(&self) -> String;
  fn get_source_file_suffix(&self) -> String;

  fn run_computation(&mut self, _request: ComputationRequest) -> ComputationResponse {
    ComputationResponse {
      main_output: Err(format!("Computation pipeline not implemented")),
      global_output_stats: GlobalOutputStats::default(),
      debug_responses: vec![],
    }
  }

  fn repl_request(&self, repl_request: String) -> String {
    format!(">> No custom interpreter directives or help info specified <<")
  }
}

//TODO source can probably be a &str
pub struct ComputationRequest {
  pub source: String,
  pub debug_requests: Vec<DebugRequest>,
}

pub struct ComputationResponse {
  pub main_output: Result<String, String>,
  pub global_output_stats: GlobalOutputStats,
  pub debug_responses: Vec<DebugResponse>,
}

pub struct DebugRequest {
  kind: String,
  value: String
}

pub struct DebugResponse {
  kind: String,
  value: String
}

#[derive(Default, Debug)]
pub struct GlobalOutputStats {
  total_duration: Option<time::Duration>,
  stage_durations: Option<Vec<(String, time::Duration)>>
}

  /*
impl GlobalOutputStats {
  fn get_timing(&self) -> Option<String> {
    if self.durations.len() != 0 {
      let mut buf = String::new();
      write!(&mut buf, "Timing: ").unwrap();
      for duration in self.durations.iter() {
        let timing = (duration.as_secs() as f64) + (duration.subsec_nanos() as f64 * 1e-9);
        write!(&mut buf, "{}s, ", timing).unwrap()
      }
      write!(&mut buf, "\n").unwrap();
      Some(buf)
    } else {
      None
    }
  }
}
*/