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use super::Manifest;
use crate::{
    contexts::{to_tera, Contexts},
    manifests::get_manifest_name,
    tera_functions::register_functions,
};
use ignore::WalkBuilder;
use std::{
    collections::HashMap, error::Error, ffi::OsStr, fs::canonicalize, ops::Deref, path::PathBuf,
};
use tera::Tera;
use tracing::{error, span};

pub fn load(manifest_path: PathBuf, contexts: &Contexts) -> HashMap<String, Manifest> {
    let mut manifests: HashMap<String, Manifest> = HashMap::new();

    let mut walker = WalkBuilder::new(&manifest_path);

    // FIXME: get rid of all .unwrap() calls
    walker
        .standard_filters(true)
        .follow_links(false)
        .same_file_system(true)
        // Arbitrary for now, 9 "should" be enough?
        .max_depth(Some(9))
        .build()
        // Don't walk directories
        .filter(|entry| {
            !entry
                .as_ref()
                .ok()
                .and_then(|entry| entry.metadata().ok().map(|entry| entry.is_dir()))
                .unwrap_or(false)
        })
        .filter(|entry| {
            entry
                .as_ref()
                .ok()
                .and_then(|entry| entry.file_name().to_str())
                .map(|file_name| {
                    file_name.ends_with(".yaml")
                        || file_name.ends_with(".yml")
                        || file_name.ends_with(".toml")
                })
                .unwrap_or(false)
        })
        // Don't consider anything in a `files` directory a manifest
        .filter(|entry| {
            !entry
                .as_ref()
                .ok()
                .and_then(|entry| {
                    entry.path().parent().and_then(|parent| {
                        parent.file_name().map(|file_name| file_name.eq("files"))
                    })
                })
                .unwrap_or(false)
        })
        .for_each(|entry| {
            if let Ok(filename) = entry {
                let span = span!(
                    tracing::Level::INFO,
                    "manifest_load",
                    manifest = filename.file_name().to_str()
                )
                .entered();

                let entry = canonicalize(filename.into_path()).ok().unwrap_or_default();
                let contents =
                    std::fs::read_to_string(entry.clone()).unwrap_or_else(|_| String::from(""));
                let template = contents.as_str();

                let mut tera = Tera::default();
                register_functions(&mut tera);

                let template = match tera.render_str(template, &to_tera(contexts)) {
                    Ok(template) => template,
                    Err(err) => {
                        match err.source() {
                            Some(err) => error!(message = err.source()),
                            None => error!(message = err.to_string().as_str()),
                        }

                        span.exit();

                        return;
                    }
                };

                let manifest: anyhow::Result<Manifest> = match entry
                    .extension()
                    .and_then(OsStr::to_str)
                {
                    Some("yaml") | Some("yml") => {
                        serde_yml::from_str::<Manifest>(template.deref()).map_err(anyhow::Error::from)
                    }
                    Some("toml") => toml::from_str::<Manifest>(template.deref()).map_err(anyhow::Error::from),
                    _ => {
                        error!("Unrecognized file extension for manifest");
                        span.exit();

                        return;
                    }
                };

                match manifest {
                    Ok(mut manifest) => {
                        let name = get_manifest_name(&manifest_path, &entry)
                            .expect("Failed to get manifest name");

                        manifest.root_dir = entry.parent().map(|parent| parent.to_path_buf());

                        manifest.name = Some(name.clone());

                        manifests.insert(name, manifest);
                    }
                    Err(err) => {
                        let manifest_name =
                            get_manifest_name(&manifest_path, &entry).unwrap_or_default();

                        error!("Manifest '{manifest_name}' in file with path '{}' cannot be parsed. Reason: {err}", &entry.display());
                    }
                }

                span.exit();
            }
        });

    manifests
}