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+# Pleroma: A lightweight social networking server
+# Copyright © 2017-2018 Pleroma Authors <https://pleroma.social/>
+# SPDX-License-Identifier: AGPL-3.0-only
+
+defmodule Mix.Tasks.Pleroma.Emoji do
+  use Mix.Task
+
+  @shortdoc "Manages emoji packs"
+  @moduledoc """
+  Manages emoji packs
+
+  ## ls-packs
+
+  mix pleroma.emoji ls-packs [OPTION...]
+
+  Lists the emoji packs and metadata specified in the manifest.
+
+  ### Options
+
+  - `-m, --manifest PATH/URL` - path to a custom manifest, it can
+    either be an URL starting with `http`, in that case the
+    manifest will be fetched from that address, or a local path
+
+  ## get-packs
+
+  mix pleroma.emoji get-packs [OPTION...] PACKS
+
+  Fetches, verifies and installs the specified PACKS from the
+  manifest into the `STATIC-DIR/emoji/PACK-NAME
+
+  ### Options
+
+  - `-m, --manifest PATH/URL` - same as ls-packs
+
+  ## gen-pack
+
+  mix pleroma.emoji gen-pack PACK-URL
+
+  Creates a new manifest entry and a file list from the specified
+  remote pack file. Currently, only .zip archives are recognized
+  as remote pack files and packs are therefore assumed to be zip
+  archives. This command is intended to run interactively and will
+  first ask you some basic questions about the pack, then download
+  the remote file and generate an SHA256 checksum for it, then
+  generate an emoji file list for you.
+
+  The manifest entry will either be written to a newly created
+  `index.json` file or appended to the existing one, *replacing*
+  the old pack with the same name if it was in the file previously.
+
+  The file list will be written to the file specified previously,
+  *replacing* that file. You _should_ check that the file list doesn't
+  contain anything you don't need in the pack, that is, anything that is
+  not an emoji (the whole pack is downloaded, but only emoji files
+  are extracted).
+  """
+
+  @default_manifest Pleroma.Config.get!([:emoji, :default_manifest])
+
+  def run(["ls-packs" | args]) do
+    Application.ensure_all_started(:hackney)
+
+    {options, [], []} = parse_global_opts(args)
+
+    manifest =
+      fetch_manifest(if options[:manifest], do: options[:manifest], else: @default_manifest)
+
+    Enum.each(manifest, fn {name, info} ->
+      to_print = [
+        {"Name", name},
+        {"Homepage", info["homepage"]},
+        {"Description", info["description"]},
+        {"License", info["license"]},
+        {"Source", info["src"]}
+      ]
+
+      for {param, value} <- to_print do
+        IO.puts(IO.ANSI.format([:bright, param, :normal, ": ", value]))
+      end
+
+      # A newline
+      IO.puts("")
+    end)
+  end
+
+  def run(["get-packs" | args]) do
+    Application.ensure_all_started(:hackney)
+
+    {options, pack_names, []} = parse_global_opts(args)
+
+    manifest_url = if options[:manifest], do: options[:manifest], else: @default_manifest
+
+    manifest = fetch_manifest(manifest_url)
+
+    for pack_name <- pack_names do
+      if Map.has_key?(manifest, pack_name) do
+        pack = manifest[pack_name]
+        src_url = pack["src"]
+
+        IO.puts(
+          IO.ANSI.format([
+            "Downloading ",
+            :bright,
+            pack_name,
+            :normal,
+            " from ",
+            :underline,
+            src_url
+          ])
+        )
+
+        binary_archive = Tesla.get!(src_url).body
+        archive_sha = :crypto.hash(:sha256, binary_archive) |> Base.encode16()
+
+        sha_status_text = ["SHA256 of ", :bright, pack_name, :normal, " source file is ", :bright]
+
+        if archive_sha == String.upcase(pack["src_sha256"]) do
+          IO.puts(IO.ANSI.format(sha_status_text ++ [:green, "OK"]))
+        else
+          IO.puts(IO.ANSI.format(sha_status_text ++ [:red, "BAD"]))
+
+          raise "Bad SHA256 for #{pack_name}"
+        end
+
+        # The url specified in files should be in the same directory
+        files_url = Path.join(Path.dirname(manifest_url), pack["files"])
+
+        IO.puts(
+          IO.ANSI.format([
+            "Fetching the file list for ",
+            :bright,
+            pack_name,
+            :normal,
+            " from ",
+            :underline,
+            files_url
+          ])
+        )
+
+        files = Tesla.get!(files_url).body |> Poison.decode!()
+
+        IO.puts(IO.ANSI.format(["Unpacking ", :bright, pack_name]))
+
+        pack_path =
+          Path.join([
+            Pleroma.Config.get!([:instance, :static_dir]),
+            "emoji",
+            pack_name
+          ])
+
+        files_to_unzip =
+          Enum.map(
+            files,
+            fn {_, f} -> to_charlist(f) end
+          )
+
+        {:ok, _} =
+          :zip.unzip(binary_archive,
+            cwd: pack_path,
+            file_list: files_to_unzip
+          )
+
+        IO.puts(IO.ANSI.format(["Writing emoji.txt for ", :bright, pack_name]))
+
+        emoji_txt_str =
+          Enum.map(
+            files,
+            fn {shortcode, path} ->
+              emojo_path = Path.join("/emoji/#{pack_name}", path)
+              "#{shortcode}, #{emojo_path}"
+            end
+          )
+          |> Enum.join("\n")
+
+        File.write!(Path.join(pack_path, "emoji.txt"), emoji_txt_str)
+      else
+        IO.puts(IO.ANSI.format([:bright, :red, "No pack named \"#{pack_name}\" found"]))
+      end
+    end
+  end
+
+  def run(["gen-pack", src]) do
+    Application.ensure_all_started(:hackney)
+
+    proposed_name = Path.basename(src) |> Path.rootname()
+    name = String.trim(IO.gets("Pack name [#{proposed_name}]: "))
+    # If there's no name, use the default one
+    name = if String.length(name) > 0, do: name, else: proposed_name
+
+    license = String.trim(IO.gets("License: "))
+    homepage = String.trim(IO.gets("Homepage: "))
+    description = String.trim(IO.gets("Description: "))
+
+    proposed_files_name = "#{name}.json"
+    files_name = String.trim(IO.gets("Save file list to [#{proposed_files_name}]: "))
+    files_name = if String.length(files_name) > 0, do: files_name, else: proposed_files_name
+
+    default_exts = [".png", ".gif"]
+    default_exts_str = Enum.join(default_exts, " ")
+
+    exts =
+      String.trim(
+        IO.gets("Emoji file extensions (separated with spaces) [#{default_exts_str}]: ")
+      )
+
+    exts =
+      if String.length(exts) > 0 do
+        String.split(exts, " ")
+        |> Enum.filter(fn e -> e |> String.trim() |> String.length() > 0 end)
+      else
+        default_exts
+      end
+
+    IO.puts("Downloading the pack and generating SHA256")
+
+    binary_archive = Tesla.get!(src).body
+    archive_sha = :crypto.hash(:sha256, binary_archive) |> Base.encode16()
+
+    IO.puts("SHA256 is #{archive_sha}")
+
+    pack_json = %{
+      name => %{
+        license: license,
+        homepage: homepage,
+        description: description,
+        src: src,
+        src_sha256: archive_sha,
+        files: files_name
+      }
+    }
+
+    tmp_pack_dir = Path.join(System.tmp_dir!(), "emoji-pack-#{name}")
+
+    {:ok, _} =
+      :zip.unzip(
+        binary_archive,
+        cwd: tmp_pack_dir
+      )
+
+    emoji_map = Pleroma.Emoji.make_shortcode_to_file_map(tmp_pack_dir, exts)
+
+    File.write!(files_name, Poison.encode!(emoji_map, pretty: true))
+
+    IO.puts("""
+
+    #{files_name} has been created and contains the list of all found emojis in the pack.
+    Please review the files in the remove those not needed.
+    """)
+
+    if File.exists?("index.json") do
+      existing_data = File.read!("index.json") |> Poison.decode!()
+
+      File.write!(
+        "index.json",
+        Poison.encode!(
+          Map.merge(
+            existing_data,
+            pack_json
+          ),
+          pretty: true
+        )
+      )
+
+      IO.puts("index.json file has been update with the #{name} pack")
+    else
+      File.write!("index.json", Poison.encode!(pack_json, pretty: true))
+
+      IO.puts("index.json has been created with the #{name} pack")
+    end
+  end
+
+  defp fetch_manifest(from) do
+    Poison.decode!(
+      if String.starts_with?(from, "http") do
+        Tesla.get!(from).body
+      else
+        File.read!(from)
+      end
+    )
+  end
+
+  defp parse_global_opts(args) do
+    OptionParser.parse(
+      args,
+      strict: [
+        manifest: :string
+      ],
+      aliases: [
+        m: :manifest
+      ]
+    )
+  end
+end