#The MIT License (MIT)
#
#Copyright (c) 2016 - 2026 rick barrette
#
#Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions:
#
#The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.
#
#THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.

class BillIssueTimeJob < ActiveJob::Base
  queue_as :default
  retry_on StandardError, wait: 5.minutes, attempts: 5

  # Perform billing of unbilled time entries for a given issue by creating corresponding TimeActivity records in QuickBooks Online, and then marking those entries as billed in Redmine. This job is typically triggered after an invoice is created or updated to ensure all relevant time is captured for billing.
  def perform(issue_id)
    issue = Issue.find(issue_id)

    log "Starting billing for issue ##{issue.id}"
    issue.with_lock do
      unbilled_entries = issue.time_entries.where(billed: [false, nil]).lock
      return if unbilled_entries.blank?

      totals = aggregate_hours(unbilled_entries)
      return if totals.blank?
      log "Aggregated hours for billing: #{totals.inspect}"

      qbo = QboConnectionService.current!
      qbo.perform_authenticated_request do |access_token|
        create_time_activities(issue, totals, access_token, qbo)
      end

      # Only mark billed AFTER successful QBO creation
      unbilled_entries.update_all(billed: true)
    end

    log "Completed billing for issue ##{issue.id}"
    Qbo.update_time_stamp
  rescue => e
    log "Billing failed for issue ##{issue_id} - #{e.message}"
    raise e
  end

  private

  # Aggregate time entries by activity name and sum their hours
  def aggregate_hours(entries)
    entries.includes(:activity)
           .group_by { |e| e.activity&.name }
           .transform_values { |rows| rows.sum(&:hours) }
           .compact
  end

  # Create TimeActivity records in QBO for each activity type with the appropriate hours and link them to the issue's assigned employee and customer
  def create_time_activities(issue, totals, access_token, qbo)
    log "Creating TimeActivity records in QBO for issue ##{issue.id}"
   
    time_service = Quickbooks::Service::TimeActivity.new( company_id: qbo.realm_id,  access_token: access_token)
    item_service = Quickbooks::Service::Item.new( company_id: qbo.realm_id, access_token: access_token )
    
    totals.each do |activity_name, hours_float|
      next if activity_name.blank?
      next if hours_float.to_f <= 0

      item = find_item(item_service, activity_name)
      next unless item

      hours, minutes = convert_hours(hours_float)

      time_entry = Quickbooks::Model::TimeActivity.new
      time_entry.description     = build_description(issue)
      time_entry.employee_id     = issue.assigned_to.employee_id
      time_entry.customer_id     = issue.customer_id
      time_entry.billable_status = "Billable"
      time_entry.hours           = hours
      time_entry.minutes         = minutes
      time_entry.name_of         = "Employee"
      time_entry.txn_date        = Date.today
      time_entry.hourly_rate     = item.unit_price
      time_entry.item_id         = item.id

      log "Creating TimeActivity for #{activity_name} (#{hours}h #{minutes}m)"

      time_service.create(time_entry)
    end
  end

  # Convert a decimal hours float into separate hours and minutes components for QBO TimeActivity
  def convert_hours(hours_float)
    total_minutes = (hours_float.to_f * 60).round
    hours = total_minutes / 60
    minutes = total_minutes % 60
    [hours, minutes]
  end

  # Build a descriptive string for the TimeActivity based on the issue's tracker, ID, subject, and completion status
  def build_description(issue)
    base = "#{issue.tracker} ##{issue.id}: #{issue.subject}"
    return base if issue.closed?
    "#{base} (Partial @ #{issue.done_ratio}%)"
  end

  # Find an item in QBO by name, escaping single quotes to prevent query issues. Returns nil if not found.
  def find_item(item_service, name)
    safe = name.gsub("'", "\\\\'")
    item_service.query("SELECT * FROM Item WHERE Name = '#{safe}'").first
  end

  def log(msg)
    Rails.logger.info "[BillIssueTimeJob] #{msg}"
  end
end