use std::fs::create_dir_all;
use std::io::{Result, Error, ErrorKind};
use std::path::PathBuf;
use super::{sync_down::SyncDown, generate::Generate, sync_up::SyncUp};
use crate::configuration::Configuration;
use crate::constants::METADATA_FILENAME;
use crate::metadata::Metadata;

pub struct Update;

impl Update {
    pub fn new() -> Self {
        Update
    }

    fn copy_post(&self, post_location: &PathBuf) {
        
    }

    fn write_metadata(&self, metadata: Metadata, metadata_location: &PathBuf) {
        
    }

    fn archive(&self, post_location: &PathBuf) {
        
    }
}

impl super::Command for Update {
    fn before_dependencies(&self) -> Vec<Box<dyn super::Command>> {
        vec![Box::new(SyncDown::new())]
    }

    fn execute(&self, input: Option<&String>, configuration: &Configuration, _: &String) -> Result<()> {
        let input = input.expect("You must provide a path to a post");
        let post_location = PathBuf::from(input);
        if !post_location.exists() {
            return Err(Error::new(ErrorKind::NotFound, "The path provided does not exist"));
        }

        create_dir_all(&configuration.posts_directory)?;

        let metadata_file_path = configuration.posts_directory
            .join("0")
            .join(METADATA_FILENAME);
        let metadata = Metadata::read_or_create(&metadata_file_path);

        self.copy_post(&post_location);
        self.write_metadata(metadata, &metadata_file_path);
        self.archive(&post_location);
        return Ok(())
    }

    fn after_dependencies(&self) -> Vec<Box<dyn super::Command>> {
        vec![
            Box::new(Generate::new()),
            Box::new(SyncUp::new())
        ]
    }

    fn command(&self) -> &'static str {
        "update"
    }

    fn help(&self) -> &'static str {
        "<path_to_post>\t\tUpdates latest blog post"
    }
}