use crate::barbfile::{BarbFile, Header};

use std::collections::HashMap;
use std::env;
use ureq;

struct Context {
    vars: HashMap<String, String>,
}

impl Context {
    pub fn new() -> Context {
        let mut vars = HashMap::new();
        vars.extend(env::vars());
        
        Context {
            vars
        }
    }

    // Preserved for future reference
    // pub fn get_var(&self, name: String) -> Option<String> {
    //     self.vars
    //         .get(&name)
    //         .map(|val| val.clone())
    //         .or_else(|| env::var(name).ok())
    // }

    fn key_str(&self, key: &String) -> String {
        format!("{{{}}}", key)
    }

    pub fn substitute(&self, string: &String) -> String {
        let mut buffer = string.clone();
        for (key, val) in self.vars.iter() {
            buffer = buffer.replace(self.key_str(key).as_str(), val);
        }

        buffer
    }
}

pub struct Executor {
    context: Context
}

impl Executor {
    pub fn new() -> Executor {
        Executor {
            context: Context::new()
        }
    }

    pub fn execute(&mut self, bfile: BarbFile) -> Result<ureq::Response, String> {
        let mut req = ureq::request(
            bfile.method_as_string().as_str(),
            self.context.substitute(&bfile.url()).as_str()
        );

        for header in bfile.headers() {
            req = req.set(header.name(), self.context.substitute(header.value()).as_str());
            println!("{} {}", header.name(), self.context.substitute(header.value()));
        }

        match bfile.method().takes_body() {
            true => match bfile.body() {
                Some(body) => req.send_string(body.as_str()),
                None => req.call(),
            },
            false => req.call(),
        }
        .map_err(|_| String::from("Error"))
    }
}

// TODO: tests