# frozen_string_literal: true

module Requests
  class E621
    include HTTParty
    base_uri "https://e621.net"

    def options
      opt = Websites.config.httparty_options
      opt[:headers]["Authorization"] = "Basic #{Base64.strict_encode64("#{Websites.config.e621_username}:#{Websites.config.e621_apikey}")}" if Websites.config.e621_username.present? && Websites.config.e621_apikey.present?
      opt
    end

    def status
      r = self.class.get("/posts.json?limit=0", options.deep_merge({
        headers: {
          "User-Agent" => "E621Status/1.0.0 (https://status.e621.ws; \"donovan_dmc\")",
        },
        timeout: 5,
      }))
      status = r.code
      if r.code == 503 && r.headers["Content-Type"]&.start_with?("text/html")
        status = 1
      elsif r.code == 501
        status = 200
        Rails.logger.warn("E621 status check returned 501, ignoring")
      end
      status
    rescue Net::OpenTimeout
      Rails.logger.warn("E621 status check timed out")
      408
    rescue StandardError => e
      Rails.logger.warn("E621 status check failed: #{e}")
      0
    end

    def get_post(id: nil, md5: nil)
      raise(ArgumentError, "id or md5 must be given") if id.nil? && md5.nil?
      path = "/"
      path = "/posts/#{id}.json" if id
      path = "/posts.json?md5=#{md5}" if md5
      r = self.class.get(path, options)
      return nil if r.code != 200
      JSON.parse(r.body)["post"]
    end

    def get_posts_by_tags(tags:, limit: 100, page: 1)
      path = "/posts.json?tags=#{tags}&limit=#{limit}&page=#{page}"
      r = self.class.get(path, options)
      JSON.parse(r.body)["posts"] || []
    end

    def get_all_posts_by_tags(tags:)
      posts = []
      page = 1
      loop do
        posts += p = get_posts_by_tags(tags: tags, limit: 320, page: page)
        break if p.length < 320
        page += 1
      end
      posts
    end

    def get_posts(ids: nil, md5s: nil, status: nil)
      raise(ArgumentError, "ids or md5s must be given") if ids.nil? && md5s.nil?
      path = "/posts.json?"
      path += "tags=id:#{ids.join(',')}%20limit:100" if ids
      path += "tags=md5:#{md5s.join(',')}%20limit:100" if md5s
      path += "%20status:#{status}" if path.include?("tags=") && !status.nil?
      path += "tags=status:#{status}" if !path.include?("tags=") && !status.nil?
      Rails.logger.info("Fetching posts from e621: #{path}") if Rails.env.development?
      r = self.class.get(path, options)
      JSON.parse(r.body)["posts"] || []
    end

    def get_all_posts(ids: [], md5s: [])
      posts = []
      ids.each_slice(100) do |slice|
        posts += get_posts(ids: slice, status: "any")
      end
      md5s -= posts.map { |p| p["file"]["md5"] }
      md5s.each_slice(100) do |slice|
        posts += get_posts(md5s: slice, status: "any")
      end
      missing = {
        ids:  ids - posts.pluck("id"),
        md5s: md5s - posts.map { |p| p["file"]["md5"] },
      }

      { posts: posts, missing: missing }
    end

    def find_replacement(md5:)
      r = self.class.get("/post_replacements.json?search[md5]=#{md5}", options)
      JSON.parse(r.body)&.first
    end

    def name_to_id(name)
      Cache.fetch("name_to_id:#{name.downcase}", expires_in: 1.day) do
        r = self.class.get("/users.json?search[name_matches]=#{name}", options)
        JSON.parse(r.body)&.first&.dig("id")
      end
    end

    def self.status
      new.status
    end

    def self.get_post(...)
      new.get_post(...)
    end

    def self.get_posts(...)
      new.get_posts(...)
    end

    def self.get_all_posts(...)
      new.get_all_posts(...)
    end

    def self.get_posts_by_tags(...)
      new.get_posts_by_tags(...)
    end

    def self.get_all_posts_by_tags(...)
      new.get_all_posts_by_tags(...)
    end

    def self.find_replacement(...)
      new.find_replacement(...)
    end

    def self.name_to_id(...)
      new.name_to_id(...)
    end
  end
end