use std::borrow::Cow;
use std::ops::Deref;
use std::path::Path;

use command_runner::{CommandRunner, SetuidCommandRunner};
use storage::{SimpleStorage, Storage};
use symbols::acme::{AcmeCert, AcmeCertChain};
use symbols::cron::Cron;
use symbols::file::File;
use symbols::git::checkout::GitCheckout;
use symbols::hook::Hook;
use symbols::list::ListAction;
use symbols::mariadb::{DatabaseDump, MariaDBDatabase, MariaDBUser};
use symbols::nginx::server::{php_server_config_snippet, server_config, NginxServer};
use symbols::owner::Owner;
use symbols::stored_directory::{StorageDirection, StoredDirectory};
use symbols::systemd::reload::ReloadService;
use symbols::tls::SelfSignedTlsCert;
use symbols::{Action, Symbol, SymbolRunner};

pub trait Policy {
  fn user_name_for_host(&self, host_name: &'static str) -> String;
  fn home_for_user(&self, user_name: &str) -> String {
    format!("/home/{}", user_name)
  }
}

pub struct DefaultPolicy;

impl Policy for DefaultPolicy {
  fn user_name_for_host(&self, host_name: &'static str) -> String {
    host_name.split('.').rev().fold(String::new(), |result, part| if result.is_empty() { result } else { result + "_" } + part)
  }
}

pub struct SymbolFactory<'a, C: 'a + CommandRunner, R: 'a + SymbolRunner, P: 'a + Policy> {
  command_runner: &'a C,
  acme_command_runner: SetuidCommandRunner<'a, C>,
  symbol_runner: &'a R,
  policy: &'a P,
}

impl<'b, C: 'b + CommandRunner, R: 'b + SymbolRunner, P: 'b + Policy> SymbolFactory<'b, C, R, P> {
  pub fn new(command_runner: &'b C, symbol_runner: &'b R, policy: &'b P) -> Self {
    let acme_user = "acme"; // FIXME: CONFIG

    let acme_command_runner = SetuidCommandRunner::new(acme_user, command_runner);
    SymbolFactory {
      command_runner,
      acme_command_runner,
      symbol_runner,
      policy,
    }
  }

  pub fn get_nginx_acme_server<'a, 'c: 'a, S: 'a + Symbol>(
    &'c self,
    host: &'static str,
    nginx_server_symbol: S,
  ) -> Box<dyn Action + 'a> {
    Box::new(ListAction::new(vec![
      Box::new(SelfSignedTlsCert::new(host.into(), self.command_runner))
        .into_action(self.symbol_runner),
      Box::new(Hook::new(
        nginx_server_symbol,
        ReloadService::new("nginx", self.command_runner),
      ))
      .into_action(self.symbol_runner),
      Box::new(AcmeCert::new(host.into(), &self.acme_command_runner))
        .into_action(self.symbol_runner),
      Box::new(Hook::new(
        AcmeCertChain::new(host.into(), &self.acme_command_runner),
        ReloadService::new("nginx", self.command_runner),
      ))
      .into_action(self.symbol_runner),
    ]))
  }
  pub fn get_nginx_acme_challenge_config<'a>(&'a self) -> Box<dyn Action + 'a> {
    Box::new(File::new(
      "/etc/nginx/snippets/acme-challenge.conf",
      "location ^~ /.well-known/acme-challenge/ {
  alias /home/acme/challenges/;
  try_files $uri =404;
}",
    ))
    .into_action(self.symbol_runner)
  }

  fn get_php_fpm_pool_socket_path<'a>(&'a self, user_name: &str) -> String {
    format!("/run/php/{}.sock", user_name)
  }

  fn get_php_fpm_pool<'a>(&'a self, user_name: &str) -> Box<dyn Action + 'a> {
    let socket = self.get_php_fpm_pool_socket_path(user_name);
    Box::new(Hook::new(
      File::new(
        format!("/etc/php/7.0/fpm/pool.d/{}.conf", user_name),
        format!(
          "[{0}]

user = {0}
group = www-data
listen = {1}
listen.owner = www-data
pm = ondemand
pm.max_children = 10
catch_workers_output = yes
env[PATH] = /usr/local/bin:/usr/bin:/bin
",
          user_name, socket
        ),
      ),
      ReloadService::new("php7.0-fpm", self.command_runner),
    ))
    .into_action(self.symbol_runner)
  }

  pub fn serve_php<'a>(
    &'a self,
    host_name: &'static str,
    root_dir: Cow<'a, str>,
  ) -> Box<dyn Action + 'a> {
    let user_name = self.policy.user_name_for_host(host_name);
    let socket = self.get_php_fpm_pool_socket_path(&user_name);
    Box::new(ListAction::new(vec![
      self.get_php_fpm_pool(&user_name),
      self.get_nginx_acme_server(
        host_name,
        NginxServer::new_php(host_name, socket.into(), root_dir, self.command_runner),
      ),
    ]))
  }

  pub fn serve_wordpress<'a>(
    &'a self,
    host_name: &'static str,
    root_dir: Cow<'a, str>,
  ) -> Box<dyn Action + 'a> {
    let user_name = self.policy.user_name_for_host(host_name);
    let socket = self.get_php_fpm_pool_socket_path(&user_name);
    Box::new(ListAction::new(vec![
      self.get_php_fpm_pool(&user_name),
      self.get_nginx_acme_server(
        host_name,
        NginxServer::new(
          host_name,
          server_config(
            host_name,
            &format!(
              "{}
              location / {{
                try_files         $uri $uri/ /index.php?$args;
              }}
          ",
              php_server_config_snippet(socket.into(), root_dir)
            ),
          ),
          self.command_runner,
        ),
      ),
    ]))
  }

  pub fn serve_dokuwiki<'a>(
    &'a self,
    host_name: &'static str,
    root_dir: &'static str,
  ) -> Box<dyn Action + 'a> {
    let user_name = self.policy.user_name_for_host(host_name);
    let socket = self.get_php_fpm_pool_socket_path(&user_name);
    Box::new(ListAction::new(vec![
      self.get_php_fpm_pool(&user_name),
      self.get_nginx_acme_server(host_name,
        NginxServer::new(
          host_name,
          server_config(host_name, &format!("
      root                {};
      index               doku.php;
      location ~ [^/]\\.php(/|$) {{
        fastcgi_pass      unix:{};
        include           \"snippets/fastcgi-php.conf\";
      }}

      location ~ /(data/|conf/|bin/|inc/|install.php) {{ deny all; }}

      location / {{ try_files $uri $uri/ @dokuwiki; }}

      location @dokuwiki {{
          # rewrites \"doku.php/\" out of the URLs if you set the userewrite setting to .htaccess in dokuwiki config page
          rewrite ^/_media/(.*) /lib/exe/fetch.php?media=$1 last;
          rewrite ^/_detail/(.*) /lib/exe/detail.php?media=$1 last;
          rewrite ^/_export/([^/]+)/(.*) /doku.php?do=export_$1&id=$2 last;
          rewrite ^/(.*) /doku.php?id=$1&$args last;
      }}
  ",
        root_dir,
        socket)),
        self.command_runner
      ))
    ]))
  }

  pub fn serve_nextcloud<'a>(
    &'a self,
    host_name: &'static str,
    root_dir: Cow<'a, str>,
  ) -> Box<dyn Action + 'a> {
    let user_name = self.policy.user_name_for_host(host_name);
    let socket = self.get_php_fpm_pool_socket_path(&user_name);
    Box::new(ListAction::new(vec![
      self.get_php_fpm_pool(&user_name),
      self.get_nginx_acme_server(
        host_name,
        NginxServer::new(
          host_name,
          server_config(
            host_name,
            &format!(
              "{}
              client_max_body_size 500M;

              # Disable gzip to avoid the removal of the ETag header
              gzip off;

              rewrite ^/caldav(.*)$ /remote.php/caldav$1 redirect;
              rewrite ^/carddav(.*)$ /remote.php/carddav$1 redirect;
              rewrite ^/webdav(.*)$ /remote.php/webdav$1 redirect;

              error_page 403 /core/templates/403.php;
              error_page 404 /core/templates/404.php;

              location = /robots.txt {{
                allow all;
                log_not_found off;
                access_log off;
              }}

              location ~ ^/(?:\\.htaccess|data|config|db_structure\\.xml|README) {{
                deny all;
              }}

              location / {{
                # The following 2 rules are only needed with webfinger
                rewrite ^/.well-known/host-meta /public.php?service=host-meta last;
                rewrite ^/.well-known/host-meta.json /public.php?service=host-meta-json last;

                rewrite ^/.well-known/carddav /remote.php/carddav/ redirect;
                rewrite ^/.well-known/caldav /remote.php/caldav/ redirect;

                rewrite ^(/core/doc/[^\\/]+/)$ $1/index.html;

                try_files $uri $uri/ /index.php;
              }}

              # Adding the cache control header for js and css files
              # Make sure it is BELOW the location ~ \\.php(?:$|/) {{ block
              location ~* \\.(?:css|js)$ {{
                add_header Cache-Control \"public, max-age=7200\";
                # Optional: Don't log access to assets
                access_log off;
              }}

              # Optional: Don't log access to other assets
              location ~* \\.(?:jpg|jpeg|gif|bmp|ico|png|swf)$ {{
                access_log off;
              }}
          ",
              php_server_config_snippet(socket.into(), root_dir)
            ),
          ),
          self.command_runner,
        ),
      ),
    ]))
  }

  pub fn serve_redir<'a>(
    &'a self,
    host_name: &'static str,
    target: &'static str,
  ) -> Box<dyn Action + 'a> {
    self.get_nginx_acme_server(
      host_name,
      NginxServer::new_redir(host_name, target, self.command_runner),
    )
  }

  pub fn serve_static<'a>(&'a self, host_name: &'static str, dir: &'a str) -> Box<dyn Action + 'a> {
    self.get_nginx_acme_server(
      host_name,
      NginxServer::new_static(host_name, dir, self.command_runner),
    )
  }

  pub fn get_stored_directory<'a, T: Into<String>>(
    &'a self,
    storage_name: &'static str,
    target: T,
  ) -> (Box<dyn Action + 'a>, Box<dyn Action + 'a>) {
    let data = SimpleStorage::new("/root/data".to_string(), storage_name.to_string());
    let string_target = target.into();
    (
      Box::new(StoredDirectory::new(
        string_target.clone().into(),
        data.clone(),
        StorageDirection::Save,
        self.command_runner,
      ))
      .into_action(self.symbol_runner),
      Box::new(StoredDirectory::new(
        string_target.into(),
        data.clone(),
        StorageDirection::Load,
        self.command_runner,
      ))
      .into_action(self.symbol_runner),
    )
  }

  pub fn get_mariadb_database<'a>(&'a self, name: &'static str) -> Box<dyn Action + 'a> {
    let db_dump = SimpleStorage::new("/root/data".to_string(), format!("{}.sql", name));
    Box::new(ListAction::new(vec![
      Box::new(MariaDBDatabase::new(
        name.into(),
        db_dump
          .read_filename()
          .expect("Initial db dump missing")
          .into(),
        self.command_runner,
      ))
      .into_action(self.symbol_runner),
      Box::new(DatabaseDump::new(name, db_dump, self.command_runner))
        .into_action(self.symbol_runner),
    ]))
  }

  pub fn get_mariadb_user<'a>(&'a self, user_name: &'static str) -> Box<dyn Action + 'a> {
    Box::new(MariaDBUser::new(user_name.into(), self.command_runner))
      .into_action(self.symbol_runner)
  }

  pub fn get_git_checkout<'a, T: 'a + AsRef<str>>(
    &'a self,
    target: T,
    source: &'a str,
    branch: &'a str,
  ) -> Box<dyn Action + 'a> {
    Box::new(GitCheckout::new(
      target,
      source,
      branch,
      self.command_runner,
    ))
    .into_action(self.symbol_runner)
  }

  pub fn get_owner<'a, F: 'a + AsRef<str>>(
    &'a self,
    file: F,
    user: &'a str,
  ) -> Box<dyn Action + 'a> {
    Box::new(Owner::new(file, user.into(), self.command_runner)).into_action(self.symbol_runner)
  }

  pub fn get_file<'a, F: 'a + Deref<Target = str>, Q: 'a + AsRef<Path>>(
    &'a self,
    path: Q,
    content: F,
  ) -> Box<dyn Action + 'a> {
    Box::new(File::new(path, content)).into_action(self.symbol_runner)
  }

  pub fn get_cron<'a, T: 'a + Deref<Target = str>, U: 'a + Deref<Target = str>>(
    &'a self,
    user: U,
    content: T,
  ) -> Box<dyn Action + 'a> {
    Box::new(Cron::new(user, content, self.command_runner)).into_action(self.symbol_runner)
  }
}