# frozen_string_literal: true

class E621Webhook < ApplicationRecord
  validate :validate_max_per_channel, on: :create
  validate :validate_max_per_guild, on: :create
  after_create do
    send_creation_message
    send_update(E621Status.current)
  end
  after_destroy do
    webhook&.delete unless skip_delete_webhook
    send_deletion_message
  end
  attr_reader :skip_delete_webhook

  MAX_PER_CHANNEL = 1
  MAX_PER_GUILD = 5
  SUCCESS_COLOR = 0x008000
  WARNING_COLOR = 0xFFA500
  ERROR_COLOR = 0xFF0000
  E621_COLOR = 0x012E57

  def self.from_struct(data, creator_id = nil)
    hook = create(
      webhook_id:    data.id,
      webhook_token: data.token,
      channel_id:    data.channel_id,
      creator_id:    creator_id,
      guild_id:      data.guild_id,
    )

    if hook.errors[:channel_id].include?("has too many webhooks")
      hook.send_too_many_channel_message
      hook.destroy
      return :too_many_channel
    end

    if hook.errors[:guild_id].include?("has too many webhooks")
      hook.send_too_many_guild_message
      hook.destroy
      return :too_many_guild
    end
    hook
  end

  def validate_max_per_channel
    return if channel_id.blank?
    return if E621Webhook.for_channel(channel_id).count < MAX_PER_CHANNEL
    errors.add(:channel_id, "has too many webhooks")
  end

  def validate_max_per_guild
    return if guild_id.blank?
    return if E621Webhook.for_guild(guild_id).count < MAX_PER_GUILD
    errors.add(:guild_id, "has too many webhooks")
  end

  module WebhookMethods
    def webhook
      return nil unless webhook_id && webhook_token
      Requests::DiscordWebhook.new(id: webhook_id, token: webhook_token)
    end

    def add_defaults(embed)
      embed.thumbnail = Discordrb::Webhooks::EmbedThumbnail.new(url: "https://status.e621.ws/icon.png")
      embed.url = "https://status.e621.ws"
      embed.timestamp = Time.now
      embed.color = E621_COLOR
    end

    def notification_webhook
      Websites.config.e621_status_check_logs_webhook
    end

    def send_creation_message
      execute do |builder|
        builder.add_embed do |embed|
          add_defaults(embed)
          embed.title = "E621 Status Check"
          embed.description = "This webhook has been setup to receive status updates for e621's api#{creator_id.present? ? " by <@#{creator_id}>" : ''}."
        end
      end

      notification_webhook.execute do |builder|
        builder.add_embed do |embed|
          add_defaults(embed)
          embed.title = "Status Check Webhook Added"
          embed.description = "A status check has been added in the channel **#{channel_id}** of the guild **#{guild_id}**#{creator_id.present? ? " by <@#{creator_id}>" : ''}."
          embed.color = SUCCESS_COLOR
        end
      end
    end

    def send_deletion_message
      notification_webhook.execute do |builder|
        builder.add_embed do |embed|
          add_defaults(embed)
          embed.title = "Status Check Webhook Removed"
          embed.description = "A status check has been removed in the channel **#{channel_id}** of the guild **#{guild_id}**#{creator_id.present? ? " by <@#{creator_id}>" : ''}."
          embed.color = ERROR_COLOR
        end
      end
    end

    def send_too_many_guild_message
      execute do |builder|
        builder.add_embed do |embed|
          add_defaults(embed)
          embed.title = "E621 Status Check"
          embed.description = "You've already enabled #{MAX_PER_GUILD} status checks in this server. Please delete the other webhooks before adding a new check. This webhook will be automatically deleted."
          embed.color = ERROR_COLOR
        end
      end
    end

    def send_too_many_channel_message
      execute do |builder|
        builder.add_embed do |embed|
          add_defaults(embed)
          embed.title = "E621 Status Check"
          embed.description = "You've already enabled #{MAX_PER_CHANNEL} status checks in this channel. Please delete the other webhooks before adding a new check. This webhook will be automatically deleted."
          embed.color = ERROR_COLOR
        end
      end
    end

    def send_update(status)
      status_text = E621Status::STATUS_MESSAGES[status.status]
      execute do |builder|
        builder.add_embed do |embed|
          add_defaults(embed)
          embed.title = "E621 Status Update"
          embed.description = "E621's api is  **#{status.available ? 'available' : 'unavailable'}**."
          embed.color = status.available ? SUCCESS_COLOR : status.status == 403 ? WARNING_COLOR : ERROR_COLOR
          embed.timestamp = status.created_at
          embed.footer =  Discordrb::Webhooks::EmbedFooter.new(text: "Since")
          embed.add_field(name: "Status", value: "#{status.status} #{status_text.present? ? "(#{status_text})" : ''}", inline: true)
          embed.add_field(name: "State", value: E621Status::STATES[status.state] || (status.available ? "up" : "down"), inline: true)
          embed.add_field(name: "Note", value: status.note, inline: false) if status.note.present?
        end
      end
    end

    def execute(...)
      if webhook.nil?
        @skip_delete_webhook = true
        destroy
        return nil
      end

      begin
        webhook.execute(...)
      rescue RestClient::NotFound
        @skip_delete_webhook = true
        destroy
        nil
      end
    end
  end

  module SearchMethods
    def for_guild(id)
      where(guild_id: id)
    end

    def for_channel(id)
      where(channel_id: id)
    end
  end

  include WebhookMethods
  extend SearchMethods
end