use std::env;
use std::fs::File;
use std::io::Read;
use std::path::{Path, PathBuf};

use toml;

fn search_template_in_dirs<'a>(dirs: &'a [PathBuf], path: &Path) -> Option<&'a PathBuf> {
    dirs.iter().find(|dir| dir.join(path).exists())
}

pub fn get_template_source(tpl_path: &Path) -> String {
    let dirs = template_dirs();
    let path = search_template_in_dirs(&dirs, tpl_path)
        .map(|dir| dir.join(tpl_path))
        .expect(&format!(
            "template file '{}' does not exist",
            tpl_path.to_str().unwrap()
        ));
    let mut f = match File::open(&path) {
        Err(_) => {
            let msg = format!("unable to open template file '{}'", &path.to_str().unwrap());
            panic!(msg)
        }
        Ok(f) => f,
    };
    let mut s = String::new();
    f.read_to_string(&mut s).unwrap();
    if s.ends_with('\n') {
        let _ = s.pop();
    }
    s
}

pub fn find_template_from_path(path: &str, start_at: Option<&Path>) -> PathBuf {
    let dirs = template_dirs();
    if let Some(rel) = start_at {
        let root = search_template_in_dirs(&dirs, rel).expect(&format!(
            "unable to find previously available template file '{}'",
            rel.to_str().unwrap()
        ));
        let fs_rel_path = root.join(rel).with_file_name(path);
        if fs_rel_path.exists() {
            return fs_rel_path.strip_prefix(&root).unwrap().to_owned();
        }
    }

    let path = Path::new(path);
    search_template_in_dirs(&dirs, &path).expect(&format!(
        "template {:?} not found in directories {:?}",
        path.to_str().unwrap(),
        dirs
    ));
    path.to_owned()
}

static CONFIG_FILE_NAME: &str = "askama.toml";

#[derive(Deserialize)]
struct RawConfig {
    dirs: Option<Vec<String>>,
}

struct Config {
    dirs: Vec<PathBuf>,
}

impl RawConfig {
    fn from_file(filename: &PathBuf) -> Option<RawConfig> {
        if filename.exists() {
            let mut contents = String::new();
            File::open(filename)
                .unwrap()
                .read_to_string(&mut contents)
                .unwrap();
            Some(toml::from_str(&contents).unwrap())
        } else {
            None
        }
    }
}

impl Config {
    fn from_file() -> Config {
        let root = PathBuf::from(env::var("CARGO_MANIFEST_DIR").unwrap());
        let filename = root.join(CONFIG_FILE_NAME);
        RawConfig::from_file(&filename).map_or_else(
            || Config {
                dirs: vec![root.join("templates")],
            },
            |config| Config {
                dirs: config
                    .dirs
                    .unwrap_or_else(|| Vec::new())
                    .into_iter()
                    .map(|directory| root.join(directory))
                    .collect(),
            },
        )
    }
}

pub fn template_dirs() -> Vec<PathBuf> {
    Config::from_file().dirs
}

#[cfg(test)]
mod tests {
    use super::Path;
    use super::{find_template_from_path, get_template_source};

    #[test]
    fn get_source() {
        assert_eq!(get_template_source(Path::new("sub/b.html")), "bar");
    }

    #[test]
    fn find_absolute() {
        let path = find_template_from_path("sub/b.html", Some(Path::new("a.html")));
        assert_eq!(path, Path::new("sub/b.html"));
    }

    #[test]
    #[should_panic]
    fn find_relative_nonexistent() {
        find_template_from_path("b.html", Some(Path::new("a.html")));
    }

    #[test]
    fn find_relative() {
        let path = find_template_from_path("c.html", Some(Path::new("sub/b.html")));
        assert_eq!(path, Path::new("sub/c.html"));
    }

    #[test]
    fn find_relative_sub() {
        let path = find_template_from_path("sub1/d.html", Some(Path::new("sub/b.html")));
        assert_eq!(path, Path::new("sub/sub1/d.html"));
    }
}