use crate::command_runner::CommandRunner;
use crate::symbols::Symbol;
use async_trait::async_trait;
use regex::Regex;
use std::error::Error;
use std::fs::File as FsFile;
use std::io;
use std::io::{BufRead, BufReader};
use std::path::{Path, PathBuf};

#[derive(Debug)]
pub struct Plugin<'a, P, N, R> {
  base: P,
  name: N,
  command_runner: &'a R,
}

impl<'a, P: AsRef<Path>, N: AsRef<str>, R: CommandRunner> Plugin<'a, P, N, R> {
  pub fn new(base: P, name: N, command_runner: &'a R) -> Self {
    Self {
      base,
      name,
      command_runner,
    }
  }

  fn get_path(&self) -> PathBuf {
    self
      .base
      .as_ref()
      .join("wp-content/plugins")
      .join(self.name.as_ref())
  }
}

#[async_trait(?Send)]
impl<P: AsRef<Path>, N: AsRef<str>, R: CommandRunner> Symbol for Plugin<'_, P, N, R> {
  async fn target_reached(&self) -> Result<bool, Box<dyn Error>> {
    let base_path = self.get_path();
    if !base_path.exists() {
      return Ok(false);
    }
    let path = base_path.join(self.name.as_ref().to_owned() + ".php");
    let mut version = String::new();
    let mut plugin_uri = String::new();
    match FsFile::open(path) {
      Err(e) => {
        // Check if file exists
        return if e.kind() == io::ErrorKind::NotFound {
          Ok(false)
        } else {
          Err(Box::new(e))
        };
      }
      Ok(file) => {
        let reader = BufReader::new(file);
        let regex = Regex::new("(?m)^(Plugin URI|Version): (.+)$")?;
        for content in reader.lines() {
          for matches in regex.captures_iter(&(content?)) {
            if &matches[1] == "Plugin URI" {
              plugin_uri = matches[2].to_string();
            } else {
              version = matches[2].to_string();
            }
          }
        }
      }
    }
    let upstream = self
      .command_runner
      .get_output(
        "curl",
        args![
          "--form",
          format!(
            r###"plugins={{"plugins":{{"{0}/{0}.php":{{"Version":"{1}", "PluginURI":"{2}"}}}}}}"###,
            self.name.as_ref(),
            version,
            plugin_uri
          ),
          "https://api.wordpress.org/plugins/update-check/1.1/",
        ],
      )
      .await?;
    Ok(String::from_utf8(upstream)?.contains(r###""plugins":[]"###))
  }

  async fn execute(&self) -> Result<(), Box<dyn Error>> {
    let source = format!(
      "https://downloads.wordpress.org/plugin/{}.zip",
      self.name.as_ref()
    );
    let zip = format!("/tmp/{}.zip", self.name.as_ref());
    self
      .command_runner
      .run_successfully("curl", args![source, "-o", zip])
      .await?;
    self
      .command_runner
      .run_successfully("rm", args!["-rf", self.get_path()])
      .await?;
    self
      .command_runner
      .run_successfully(
        "unzip",
        args![zip, "-d", self.base.as_ref().join("wp-content/plugins")],
      )
      .await
  }
}