#!/usr/bin/env ruby

require_relative "../config/environment"

class EnactTenanting
  CURRENT_DOMAIN = "https://fizzy.37signals.com"
  TENANTED_DOMAIN = Rails.env.local? ? "http://%{tenant}.fizzy.localhost:3006" : "https://%{tenant}.fizzy.37signals.com"

  PROJECT_MAPPING = {
    693169841 => "37s", # Writebook improvements
    693169850 => "37s", # Fizzy: Issues
    693169853 => "37s", # Fizzy: 💡 IDEAS
    693169858 => "37s", # Know It All: 💡 IDEAS
    693169859 => "37s", # Cycle 1: BC4 Client access for templates
    693169860 => "37s", # Know It All: Issues
    693169862 => "37s", # Active Record Tenanting
    693169863 => "37s", # Cycle 1: BC4 Hilltop View
    693169865 => "37s", # [BC iOS] Search refactor
    693169867 => "37s", # File icons refactor
    693169870 => "37s", # HEY Preload Replies
    693169872 => "37s", # [BC4 Android] Search Refactor
    693169873 => "37s", # BC4
    693169874 => "37s", # [HEY] ContentFilter pipeline rewrite
    693169875 => "37s", # [Hey Calendar Android] Search
    693169876 => "37s", # [HEY Calendar iOS] Search
    693169877 => "37s", # [BC4] Turbo for comment and answer forms

    693169842 => "dev", # Foobar
    693169843 => "dev", # Test
    693169851 => "dev", # Kevin
    693169861 => "dev", # Testing space
    693169869 => "dev", # Flower ideas
    693169871 => "dev", # Mike's TODOs

    693169856 => "qa" # QA Exploration
  }

  TENANTS = PROJECT_MAPPING.values.uniq

  attr_reader :creation_counter, :update_counter

  def initialize
    @creation_counter = {}
    @update_counter = {}
  end

  def up
    setup
    destroy_tenants

    safety_check

    copy_accounts_et_al
    copy_buckets_et_al
    copy_bubbles_et_al
    copy_filters
    copy_active_storage

    cross_check

    update_action_text_urls

    pp [ "updated:", update_counter ]

    hardlink_active_storage
  end

  def setup
    ApplicationRecord.connects_to shards: { untenanted: { reading: :primary_original } }
  end

  def with_original_db(&block)
    ApplicationRecord.connected_to(role: :reading, shard: :untenanted, &block)
  end

  def safety_check
    buckets = with_original_db { Bucket.all.to_a }

    unless buckets.map(&:id).sort == PROJECT_MAPPING.keys.sort
      unknown_buckets = buckets.map(&:id) - PROJECT_MAPPING.keys
      missing_buckets = PROJECT_MAPPING.keys - buckets.map(&:id)

      raise "Surprising buckets. unknown #{unknown_buckets.inspect}, missing #{missing_buckets.inspect}"
    end
  end

  def copy_accounts_et_al
    account         = with_original_db { Account.first }
    users           = with_original_db { User.all.to_a }
    workflows       = with_original_db { account.workflows.to_a }
    workflow_stages = with_original_db { workflows.flat_map(&:stages) }
    tags            = with_original_db { account.tags.to_a }

    TENANTS.each do |tenant|
      ApplicationRecord.with_tenant(tenant) do
        Account.create! name: tenant, id: account.id

        upsert_all users
        upsert_all workflows
        upsert_all workflow_stages
        upsert_all tags
      end
    end
  end

  def copy_buckets_et_al
    PROJECT_MAPPING.each do |bucket_id, tenant|
      bucket        = with_original_db { Bucket.where(id: bucket_id).first }
      accesses      = with_original_db { bucket.accesses.to_a }
      subscriptions = with_original_db { bucket.subscriptions.to_a }

      ApplicationRecord.with_tenant(tenant) do
        upsert_all bucket
        upsert_all accesses
        upsert_all subscriptions
      end
    end
  end

  def copy_bubbles_et_al
    PROJECT_MAPPING.each do |bucket_id, tenant|
      bubbles       = with_original_db { Bucket.find(bucket_id).bubbles.to_a }
      assignments   = with_original_db { bubbles.flat_map(&:assignments) }
      pops          = with_original_db { bubbles.filter_map(&:pop) }
      notifications = with_original_db { bubbles.flat_map(&:notifications) }
      events        = with_original_db { bubbles.flat_map(&:events) }
      taggings      = with_original_db { bubbles.flat_map(&:taggings) }
      watches       = with_original_db { bubbles.flat_map(&:watches) }
      messages      = with_original_db { bubbles.flat_map(&:messages) }
      messageables  = with_original_db { messages.filter_map(&:messageable) }
      comments      = messageables.select { _1.is_a?(Comment) }
      markdowns     = with_original_db { comments.map(&:markdown_body) }
      reactions     = with_original_db { comments.flat_map(&:reactions) }

      ApplicationRecord.with_tenant(tenant) do
        upsert_all bubbles
        upsert_all assignments
        upsert_all pops
        upsert_all taggings
        upsert_all watches
        messageables.group_by(&:class).each do |klass, klass_messageables|
          upsert_all klass_messageables
        end
        upsert_all markdowns
        upsert_all reactions
        upsert_all messages
        upsert_all events
        upsert_all notifications
      end
    end
  end

  def copy_filters
    creation_counter["Filter"] = 0
    TENANTS.each do |tenant|
      buckets = ApplicationRecord.with_tenant(tenant) { Bucket.all.to_a }

      filters = with_original_db do
        Filter.all.filter_map do |filter| # hah no pun intended
          next unless filter.buckets.empty? || buckets.any? { |b| filter.buckets.include?(b) }

          filter.attributes.merge(filter.as_params)
        end
      end

      ApplicationRecord.with_tenant(tenant) do
        filters.each do |attr|
          Filter.create! attr
        end
      end
      creation_counter["Filter"] += filters.length
    end
  end

  def copy_active_storage
    attachments = with_original_db { ActiveStorage::Attachment.all.to_a }
    blobs       = with_original_db { ActiveStorage::Blob.all.to_a }

    TENANTS.each do |tenant|
      ApplicationRecord.with_tenant(tenant) do
        upsert_all blobs
        upsert_all attachments
      end
    end
  end

  def destroy_tenants
    TENANTS.each do |tenant|
      ApplicationRecord.destroy_tenant(tenant)
    end
    FileUtils.rm_rf "storage/tenants"
  end

  def cross_check
    pp [ "created:", creation_counter ]

    with_original_db do
      assert_count User, User.count * TENANTS.length
      assert_count Workflow, Workflow.count * TENANTS.length
      assert_count Workflow::Stage, Workflow::Stage.count * TENANTS.length
      assert_count Tag, Tag.count * TENANTS.length

      assert_count Bucket, Bucket.count
      assert_count Access, Access.count
      assert_count Subscription, Subscription.count

      assert_count Bubble, Bubble.count
      assert_count Assignment, Assignment.count
      assert_count Pop, Pop.count
      assert_count EventSummary, EventSummary.count
      assert_count Comment, Comment.count
      assert_count Reaction, Reaction.count
      assert_count Message, Message.count
      assert_count Tagging, Tagging.count
      assert_count Watch, Watch.count

      # we're only copying the markdown records that are still accessible.
      assert_count ActionText::Markdown, Comment.count

      assert_count Event, Event.count
      assert_count Notification, Notification.count

      assert_count ActiveStorage::Attachment, ActiveStorage::Attachment.count * TENANTS.length
      assert_count ActiveStorage::Blob, ActiveStorage::Blob.count * TENANTS.length

      raise "Filter count is off" unless creation_counter["Filter"] >= Filter.count
    end
  end

  def update_action_text_urls
    update_counter["ActionText::Markdown"] = 0
    TENANTS.each do |tenant|
      tenanted_domain = sprintf(TENANTED_DOMAIN, tenant: tenant)

      ApplicationRecord.with_tenant(tenant) do
        ActionText::Markdown.all.each do |markdown|
          content = markdown.content
          next unless content =~ %r{#{CURRENT_DOMAIN}/u/}

          content.gsub!(%r{#{CURRENT_DOMAIN}/u/}, "#{tenanted_domain}/u/")

          markdown.update_column :content, content
          update_counter["ActionText::Markdown"] += 1
        end
      end
    end
  end

  def hardlink_active_storage
    files = Dir.glob("storage/files/*/*/*").map { _1.split("/")[2..].join("/") }

    TENANTS.each do |tenant|
      ApplicationRecord.with_tenant(tenant) do
        destdir = ActiveStorage::Blob.service.root

        files.each do |file|
          FileUtils.mkdir_p File.join(destdir, File.dirname(file))
          FileUtils.ln File.join("storage/files", file), File.join(destdir, file)
        end
      end
    end
  end

  def upsert_all(originals)
    originals = Array(originals)
    return if originals.empty?

    klass = originals.first.class

    result = klass.upsert_all(originals.collect(&:attributes))
    raise "Error upserting" unless result.rows.length == originals.length

    creation_counter[klass.name] ||= 0
    creation_counter[klass.name] += originals.length

    nil
  end

  def assert_count(klass, expected)
    actual = creation_counter[klass.name]
    unless actual == expected
      raise "#{klass} count is off: expected #{expected}, got #{actual}"
    end
  end
end

EnactTenanting.new.up

exit 0