module W3DHubLauncher
  class W3DHubApi
    API_TIMEOUT = 30 # seconds
    API_CONNECT_TIMEOUT = 10 # seconds

    PRIMARY_W3DHUB_API_ENDPOINT = "https://secure.w3dhub.com".freeze
    ALTERNATIVE_W3DHUB_API_ENDPOINT = "https://backend.w3d.cyberarm.dev".freeze

    attr_reader :applications

    attr_writer :access_token

    def initialize
      @access_token = nil

      @applications = []

      @http_clients = {}
    end

    def headers(form_encoded: false, range: nil)
      array = [
        ["user-agent", W3DHubLauncher::USER_AGENT],
        ["accept", "application/json"],
      ]

      array << ["content-type", "application/x-www-form-urlencoded"] if form_encoded
      array << ["authorization", "Bearer #{@access_token}"] if @access_token
      array << ["range", "bytes=#{range}-"] if range

      # pp array

      array
    end

    # return raw response to requester
    def fetch(url, method: :get, body: nil, headers: headers())
      result = CyberarmEngine::Result.new

      Sync do |task|
        task.with_timeout(API_TIMEOUT) do
          Async::HTTP::Internet.send(method, url, headers, body) do |response|
            if response.success?
              result.data = response.read
            else
              result.error = true
            end
          end
        rescue StandardError => e
          result.error = e
        rescue Async::TimeoutError => e
          result.error = e
        end

        result
      end

      result
    end

    # write response to file, periodically reporting progress to requester
    def download(url, path:, method: :get, body: nil, headers: headers(), &block)
      result = CyberarmEngine::Result.new

      Sync do |task|
        Async::HTTP::Internet.send(method, url, headers, body) do |response|
          if response.success?
            content_length = response.headers["content-length"] || 0

            total_downloaded_bytes = 0
            range = Integer(headers.find { |key, value| key == "range" }&.last&.split("=")&.last&.split("-")&.first || 0)
            File.open(path, range.positive? ? "r+b" : "wb") do |file|
              file.pos = range if range.positive?

              response.each do |chunk|
                file.write(chunk)
                downloaded_bytes = chunk.length
                total_downloaded_bytes += downloaded_bytes

                block&.call(downloaded_bytes, total_downloaded_bytes, content_length)
              end
            end

            result.data = true
          end
        rescue StandardError => e
          result.error = e
        rescue Async::TimeoutError
          result.error = e
        end
      end

      result
    end

    def user_login(username, password)
      result = CyberarmEngine::Result.new

      body = URI.encode_www_form("data": JSON.dump({username: username, password: password}))
      response = fetch("#{PRIMARY_W3DHUB_API_ENDPOINT}/apis/launcher/1/user-login", method: :post, body: body, headers: headers(form_encoded: true))

      if response.okay?
        hash = JSON.parse(response.data)

        user_details_result = fetch_user_details(Integer(hash["userid"]))
        user_details_hash = user_details_result.okay? ? JSON.parse(user_details_result.data) : {}

        account = W3DHubLauncher::Worker::Api::Settings::Account.create(
          user_id: hash["userid"],
          username: hash["username"],
          displayname: hash["displayname"],
          avatar_uri: user_details_hash["avatar-uri"] || "",
          access_token: hash["accessToken"],
          refresh_token: hash["refreshToken"],
          access_token_expiration_time: hash["accessTokenExpiry"]
        )

        result.data = account.to_json
      end

      result
    end

    def refresh_user_login(refresh_token)
      result = CyberarmEngine::Result.new

      body = URI.encode_www_form("data": JSON.dump({refreshToken: refresh_token}))
      response = fetch("#{PRIMARY_W3DHUB_API_ENDPOINT}/apis/launcher/1/user-login", method: :post, body: body, headers: headers(form_encoded: true))

      if response.okay?
        hash = JSON.parse(response.data)

        user_details_result = fetch_user_details(Integer(hash["userid"]))
        user_details_hash = user_details_result.okay? ? JSON.parse(user_details_result.data) : {}

        account = W3DHubLauncher::Worker::Api::Settings::Account.create(
          user_id: hash["userid"],
          username: hash["username"],
          displayname: hash["displayname"],
          avatar_uri: user_details_hash["avatar-uri"] || "",
          access_token: hash["accessToken"],
          refresh_token: hash["refreshToken"],
          access_token_expiration_time: hash["accessTokenExpiry"]
        )

        result.data = account.to_json
      end

      result
    end

    def fetch_user_details(user_id)
      result = CyberarmEngine::Result.new

      body = URI.encode_www_form("data": JSON.dump({id: user_id}))
      response = fetch("#{PRIMARY_W3DHUB_API_ENDPOINT}/apis/w3dhub/1/get-user-details", method: :post, body: body, headers: headers(form_encoded: true))

      result.data = response.data if response.okay?

      result
    end

    def fetch_applications
      result = CyberarmEngine::Result.new
      # If we're not signed in, then the primary backend will try to redirect us to the alternate backend. So skip it if we're not signed in.
      primary_result = @access_token ? fetch("#{PRIMARY_W3DHUB_API_ENDPOINT}/apis/launcher/1/get-applications") : CyberarmEngine::Result.new(error: true)
      alternate_result = fetch("#{ALTERNATIVE_W3DHUB_API_ENDPOINT}/apis/launcher/1/get-applications")

      single_source = false

      # We've failed to retrieve data
      if primary_result.error? && alternate_result.error?
        return result
      # We've only gotten data back from the primary backend
      elsif primary_result.okay? && alternate_result.error?
        result.data = primary_result.data
        single_source = true
      # We've only gotten data back from the alternate backend
      elsif primary_result.error? && alternate_result.okay?
        result.data = alternate_result.data
        single_source = true
      end

      unless single_source
        puts "FIXME: merge applications source"
        # We've gotten data back from both backends, merge them.
        # pp [primary_result, alternate_result]

        # FIXME: Merge primary and alternate results
      end

      @applications = JSON.parse(result.data)["applications"]&.map { |app| W3DHubLauncher::Worker::Api::Application.new(app) } || []

      result
    end

    def fetch_news(category)
      fetch("#{PRIMARY_W3DHUB_API_ENDPOINT}/apis/w3dhub/1/get-news", method: :post, body: "data={\"category\":\"#{category}\"}", headers: headers(form_encoded: true))
    end

    def fetch_events(category)
      fetch("#{PRIMARY_W3DHUB_API_ENDPOINT}/apis/w3dhub/1/get-server-events", method: :post, body: "data={\"serverPath\":\"#{category}\"}", headers: headers(form_encoded: true))
    end

    def fetch_test_events
      fetch("#{PRIMARY_W3DHUB_API_ENDPOINT}/apis/w3dhub/1/get-testing-times")
    end

    def fetch_manifest()
      result = CyberarmEngine::Result.new
    end

    def fetch_package_details(packages)
      body = URI.encode_www_form("data": JSON.dump({ packages: packages }))
      fetch("#{@access_token ? PRIMARY_W3DHUB_API_ENDPOINT : ALTERNATIVE_W3DHUB_API_ENDPOINT}/apis/launcher/1/get-package-details", method: :post, body: body, headers: headers(form_encoded: true))
    end

    def download_package()
      download()
    end
  end
end