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use colored::*;
use std::collections::BTreeMap;
use std::path::Path;
use serde_yaml::{Mapping, Value, Error};

pub struct ComposeYaml {
    map: BTreeMap<String, Value>
}

impl ComposeYaml {
    pub fn new(yaml: &str) -> Result<ComposeYaml, Error> {
        let map = serde_yaml::from_str(&yaml)?;
        Ok(ComposeYaml { map })
    }

    pub fn get_root_element(&self, element_name: &str) -> Option<&Mapping> {
        let value = self.map.get(element_name);
        value.map(|v| v.as_mapping()).unwrap_or_default()
    }

    pub fn get_root_element_names(&self, element_name: &str) -> Vec<&str> {
        let elements = self.get_root_element(element_name);
        match elements {
            Some(s) => s.keys().map(|k| k.as_str().unwrap()).collect::<Vec<_>>(),
            None => Vec::default()
        }
    }
}

// where to look for the compose file when the user
// don't provide a path
static COMPOSE_PATHS: [&str; 8] = [
    "compose.yaml", "compose.yml",
    "docker-compose.yaml", "docker-compose.yml",
    "docker/compose.yaml", "docker/compose.yml",
    "docker/docker-compose.yaml", "docker/docker-compose.yml",
];

pub fn get_compose_filename(filename: &Option<String>) -> Result<String, String> {
    match filename {
        Some(name) =>
            if Path::new(&name).exists() {
                Ok(String::from(name))
            } else {
                Err(format!("{}: No such file or directory: '{}'", "ERROR".red(), name))
            },
        None =>
            COMPOSE_PATHS
                .into_iter()
                .filter(|f| Path::new(f).exists())
                .map(|name| String::from(name))
                .next()
                .ok_or(format!(
                    "{}: Can't find a suitable configuration file in this directory.\n\
                     Are you in the right directory?\n\n\
                     Supported filenames: {}",
                    "ERROR".red(), COMPOSE_PATHS.into_iter().collect::<Vec<&str>>().join(", ")
                )),
    }
}