use regex::Regex;
use std::error::Error;
use std::fmt;
use std::fs::File as FsFile;
use std::io;
use std::io::{BufRead, BufReader};
use std::ops::Deref;
use std::path::{Path, PathBuf};

use command_runner::CommandRunner;
use resources::Resource;
use symbols::{Action, OwnedSymbolAction, Symbol, SymbolAction, SymbolRunner};

pub struct WordpressPlugin<'a, C, R>
where
  C: Deref<Target = str>,
  R: 'a + CommandRunner,
{
  base: C,
  name: C,
  command_runner: &'a R,
}

impl<'a, C, R> WordpressPlugin<'a, C, R>
where
  C: Deref<Target = str>,
  R: CommandRunner,
{
  pub fn new(base: C, name: C, command_runner: &'a R) -> Self {
    WordpressPlugin {
      base,
      name,
      command_runner,
    }
  }

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

impl<'a, C, R> Symbol for WordpressPlugin<'a, C, R>
where
  C: Deref<Target = str>,
  R: CommandRunner,
{
  fn target_reached(&self) -> Result<bool, Box<dyn Error>> {
    if !self.get_path().exists() {
      return Ok(false);
    }
    let path = self.get_path().join(self.name.to_string() + ".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",
      &[
        "--form",
        &format!(
          r###"plugins={{"plugins":{{"{0}/{0}.php":{{"Version":"{1}", "PluginURI":"{2}"}}}}}}"###,
          &*self.name, version, plugin_uri
        ),
        "https://api.wordpress.org/plugins/update-check/1.1/",
      ],
    )?;
    Ok(String::from_utf8(upstream)?.contains(r###""plugins":[]"###))
  }

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

  fn get_prerequisites(&self) -> Vec<Resource> {
    match self.get_path().parent() {
      Some(p) => vec![Resource::new("dir", p.to_string_lossy())],
      None => vec![],
    }
  }

  fn as_action<'b>(&'b self, runner: &'b dyn SymbolRunner) -> Box<dyn Action + 'b> {
    Box::new(SymbolAction::new(runner, self))
  }

  fn into_action<'b>(self: Box<Self>, runner: &'b dyn SymbolRunner) -> Box<dyn Action + 'b>
  where
    Self: 'b,
  {
    Box::new(OwnedSymbolAction::new(runner, *self))
  }
}

impl<'a, C, R> fmt::Display for WordpressPlugin<'a, C, R>
where
  C: Deref<Target = str>,
  R: CommandRunner,
{
  fn fmt(&self, f: &mut fmt::Formatter) -> Result<(), fmt::Error> {
    write!(f, "WordpressPlugin {}", &*self.name)
  }
}