# Copyright Cloudinary
require 'rest_client'
require 'json'

class Cloudinary::Uploader
  
  def self.build_eager(eager)
    return nil if eager.nil?
    Cloudinary::Utils.build_array(eager).map do
      |transformation, format|
      transformation = transformation.clone
      format = transformation.delete(:format) || format
      [Cloudinary::Utils.generate_transformation_string(transformation), format].compact.join("/")
    end.join("|")
  end
  
  def self.build_upload_params(options)
    params = {:timestamp=>Time.now.to_i,
              :transformation => Cloudinary::Utils.generate_transformation_string(options.clone),
              :public_id=> options[:public_id],
              :callback=> options[:callback],
              :format=>options[:format],
              :type=>options[:type],
              :backup=>Cloudinary::Utils.as_safe_bool(options[:backup]),
              :faces=>Cloudinary::Utils.as_safe_bool(options[:faces]),
              :exif=>Cloudinary::Utils.as_safe_bool(options[:exif]),
              :colors=>Cloudinary::Utils.as_safe_bool(options[:colors]),
              :image_metadata=>Cloudinary::Utils.as_safe_bool(options[:image_metadata]),
              :invalidate=>Cloudinary::Utils.as_safe_bool(options[:invalidate]),
              :eager=>build_eager(options[:eager]),
              :headers=>build_custom_headers(options[:headers]),
              :use_filename=>Cloudinary::Utils.as_safe_bool(options[:use_filename]),
              :notification_url=>options[:notification_url],
              :eager_notification_url=>options[:eager_notification_url],
              :eager_async=>Cloudinary::Utils.as_safe_bool(options[:eager_async]),
              :tags=>options[:tags] && Cloudinary::Utils.build_array(options[:tags]).join(",")}    
    params    
  end
   
  def self.upload(file, options={})
    call_api("upload", options) do    
      params = build_upload_params(options)
      if file.respond_to?(:read) || file =~ /^https?:/ || file =~ /^data:image\/\w*;base64,([a-zA-Z0-9\/+\n=]+)$/
        params[:file] = file
      else 
        params[:file] = File.open(file, "rb")
      end
      [params, [:file]]
    end              
  end

  def self.destroy(public_id, options={})
    call_api("destroy", options) do    
      {
        :timestamp=>Time.now.to_i,
        :type=>options[:type],
        :public_id=> public_id,
        :invalidate=>options[:invalidate],
      }
    end              
  end

  def self.rename(from_public_id, to_public_id, options={})
    call_api("rename", options) do    
      {
        :timestamp=>Time.now.to_i,
        :type=>options[:type],
        :overwrite=>options[:overwrite],
        :from_public_id=>from_public_id,
        :to_public_id=>to_public_id,
      }
    end              
  end

  def self.exists?(public_id, options={})
    cloudinary_url = Cloudinary::Utils.cloudinary_url(public_id, options)
    begin
      RestClient::Request.execute(:method => :head, :url => cloudinary_url, :timeout=>5).code.to_s =~ /2\d{2}/
    rescue RestClient::ResourceNotFound => e
      return false
    end
    
  end

  def self.explicit(public_id, options={})
    call_api("explicit", options) do    
      {
        :timestamp=>Time.now.to_i,
        :type=>options[:type],
        :public_id=> public_id,
        :callback=> options[:callback],
        :eager=>build_eager(options[:eager]),
        :headers=>build_custom_headers(options[:headers]),
        :tags=>options[:tags] && Cloudinary::Utils.build_array(options[:tags]).join(",")    
      }
    end              
  end
    
  TEXT_PARAMS = [:public_id, :font_family, :font_size, :font_color, :text_align, :font_weight, :font_style, :background, :opacity, :text_decoration]  
  def self.text(text, options={})
    call_api("text", options) do
      params = {:timestamp => Time.now.to_i, :text=>text}
      TEXT_PARAMS.each{|k| params[k] = options[k] if !options[k].nil?}
      params
    end
  end  
    
  def self.generate_sprite(tag, options={})
    version_store = options.delete(:version_store)
    
    result = call_api("sprite", options) do
      {
        :timestamp=>Time.now.to_i,
        :tag=>tag,
        :async=>options[:async],
        :notification_url=>options[:notification_url],
        :transformation => Cloudinary::Utils.generate_transformation_string(options.merge(:fetch_format=>options[:format]))        
      }    
    end
    
    if version_store == :file && result && result["version"]
      if defined?(Rails) && defined?(Rails.root)
        FileUtils.mkdir_p("#{Rails.root}/tmp/cloudinary")
        File.open("#{Rails.root}/tmp/cloudinary/cloudinary_sprite_#{tag}.version", "w"){|file| file.print result["version"].to_s}                      
      end  
    end      
    return result
  end

  def self.multi(tag, options={})
    call_api("multi", options) do
      {
        :timestamp=>Time.now.to_i,
        :tag=>tag,
        :format=>options[:format],
        :async=>options[:async],
        :notification_url=>options[:notification_url],
        :transformation => Cloudinary::Utils.generate_transformation_string(options.clone)        
      }    
    end
  end
  
  def self.explode(public_id, options={})    
    call_api("explode", options) do
      {
        :timestamp=>Time.now.to_i,
        :public_id=>public_id,
        :type=>options[:type],
        :format=>options[:format],
        :notification_url=>options[:notification_url],
        :transformation => Cloudinary::Utils.generate_transformation_string(options.clone)        
      }    
    end
  end
    
  # options may include 'exclusive' (boolean) which causes clearing this tag from all other resources 
  def self.add_tag(tag, public_ids = [], options = {})
    exclusive = options.delete(:exclusive)
    command = exclusive ? "set_exclusive" : "add"
    return self.call_tags_api(tag, command, public_ids, options)    
  end

  def self.remove_tag(tag, public_ids = [], options = {})
    return self.call_tags_api(tag, "remove", public_ids, options)    
  end

  def self.replace_tag(tag, public_ids = [], options = {})
    return self.call_tags_api(tag, "replace", public_ids, options)    
  end
  
  private
  
  def self.call_tags_api(tag, command, public_ids = [], options = {})
    return call_api("tags", options) do
      {
        :timestamp=>Time.now.to_i,
        :tag=>tag,
        :public_ids => Cloudinary::Utils.build_array(public_ids),
        :command => command,
        :type => options[:type]
      }    
    end    
  end
     
  def self.call_api(action, options)
    options = options.clone
    return_error = options.delete(:return_error)
    api_key = options[:api_key] || Cloudinary.config.api_key || raise(CloudinaryException, "Must supply api_key")
    api_secret = options[:api_secret] || Cloudinary.config.api_secret || raise(CloudinaryException, "Must supply api_secret")

    params, non_signable = yield
    non_signable ||= []
    
    params[:signature] = Cloudinary::Utils.api_sign_request(params.reject{|k,v| non_signable.include?(k)}, api_secret)
    params[:api_key] = api_key

    result = nil
    
    api_url = Cloudinary::Utils.cloudinary_api_url(action, options)
    
    RestClient::Request.execute(:method => :post, :url => api_url, :payload => params.reject{|k, v| v.nil? || v==""}, :timeout=>60) do
      |response, request, tmpresult|
      raise CloudinaryException, "Server returned unexpected status code - #{response.code} - #{response.body}" if ![200,400,500].include?(response.code)
      begin
        result = Cloudinary::Utils.json_decode(response.body)
      rescue => e
        # Error is parsing json
        raise CloudinaryException, "Error parsing server response (#{response.code}) - #{response.body}. Got - #{e}"
      end
      if result["error"]
        if return_error
          result["error"]["http_code"] = response.code
        else
          raise CloudinaryException, result["error"]["message"]
        end
      end        
    end
    
    result    
  end
  
  def self.build_custom_headers(headers)
    Array(headers).map{|*a| a.join(": ")}.join("\n")
  end
end