class Reports::SystmOneExporter

# File app/lib/reports/systm_one_exporter.rb, line 104
  def self.call(...) = new(...).call

  private_class_method :new

  private

  attr_reader :team, :programme, :academic_year, :start_date, :end_date

  def headers
    [
      "Practice code",
      "NHS number",
      "Surname",
      "Middle name",
      "Forename",
      "Gender",
      "Date of Birth",
      "House name",
      "House number and road",
      "Town",
      "Postcode",
      "Vaccination",
      "Part",
      "Admin date",
      "Batch number",
      "Expiry date",
      "Dose",
      "Reason",
      "Site",
      "Method",
      "Notes"
    ]
  end

  def vaccination_records
    team
      .vaccination_records
      .administered
      .sourced_from_service
      .for_programme(programme)
      .for_academic_year(academic_year)
      .created_or_updated_between(start_date, end_date)
      .includes(
        :location,
        :patient,
        :performed_by_user,
        :session,
        :supplied_by,
        :vaccine
      )
  end

  def row(vaccination_record:)
    patient = vaccination_record.patient

    [
      practice_code(vaccination_record), # Practice code
      patient.nhs_number, # NHS number
      patient.family_name, # Surname
      "", # Middle name (not stored)
      patient.given_name, # Forename
      gender_code(patient.gender_code), # Gender
      patient.date_of_birth.to_fs(:uk_short),
      patient.restricted? ? "" : patient.address_line_2, # House name
      patient.restricted? ? "" : patient.address_line_1, # House number and road
      patient.restricted? ? "" : patient.address_town, # Town
      patient.restricted? ? "" : patient.address_postcode, # Postcode
      vaccination(vaccination_record), # Vaccination
      "", # Part
      vaccination_record.performed_at.to_date.to_fs(:uk_short), # Admin date
      vaccination_record.batch_number, # Batch number
      vaccination_record.batch_expiry&.to_fs(:uk_short), # Expiry date
      vaccination_record.dose_volume_ml, # Dose
      reason(vaccination_record), # Reason (not specified)
      site(vaccination_record), # Site
      method(vaccination_record), # Method
      notes(vaccination_record) # Notes
    ]
  end

  def practice_code(vaccination_record)
    location = vaccination_record.location

    if location&.systm_one_code.present?
      location.systm_one_code
    elsif location&.gias_school?
      location.urn
    elsif location
      location.ods_code
    else
      vaccination_record.session.location.ods_code
    end
  end

  def gender_code(code)
    GENDER_CODE_MAPPINGS[code]
  end

  # TODO: These mappings are valid for Hertforshire, but may not be correct for
  #       other SAIS teams. We'll need to check these are correct with new SAIS
  #       teams.
  def vaccination(vaccination_record)
    return if vaccination_record.not_administered?

    programme = vaccination_record.programme
    vaccine_brand = vaccination_record.vaccine.brand
    dose_sequence = vaccination_record.dose_sequence

    if programme.mmr?
      procedure_mapping =
        PROCEDURE_DOSE_MAPPINGS.dig(programme.variant_type, dose_sequence)
      return procedure_mapping if procedure_mapping.present?
    end

    product_mapping = PRODUCT_DOSE_MAPPINGS.dig(vaccine_brand, dose_sequence)
    return product_mapping if product_mapping.present?

    dose_sequence ? "#{vaccine_brand} Part #{dose_sequence}" : vaccine_brand
  end

  def reason(vaccination_record)
    case vaccination_record.dose_sequence
    when 1, nil
      "Routine"
    else
      "At Risk"
    end
  end

  # TODO: These mappings are valid for Hertforshire, but may not be correct for
  #       other SAIS teams. We'll need to check these are correct with new SAIS
  #       teams.
  def site(vaccination_record)
    return if vaccination_record.not_administered?

    DELIVERY_SITE_MAPPINGS.fetch(vaccination_record.delivery_site)
  end

  def notes(vaccination_record)
    [
      vaccination_record.notes,
      if (user = vaccination_record.performed_by)
        "Administered by: #{user.full_name}"
      end,
      if (user = vaccination_record.supplied_by)
        if vaccination_record.pgd?
          "Authorised by: #{user.full_name}"
        else
          "Prescribed by: #{user.full_name}"
        end
      end
    ].compact_blank.join("\n")
  end

  def method(vaccination_record)
    return if vaccination_record.not_administered?

    DELIVERY_METHOD_MAPPINGS.fetch(vaccination_record.delivery_method)
  end
end

# File app/lib/reports/systm_one_exporter.rb, line 88
def initialize(team:, programme:, academic_year:, start_date:, end_date:)
  @team = team
  @programme = programme
  @academic_year = academic_year
  @start_date = start_date
  @end_date = end_date
end

# File app/lib/reports/systm_one_exporter.rb, line 96
def call
  CSV.generate(headers:, write_headers: true) do |csv|
    vaccination_records.find_each do |vaccination_record|
      csv << row(vaccination_record:)
    end
  end
end

# File app/lib/reports/systm_one_exporter.rb, line 198
def gender_code(code)
  GENDER_CODE_MAPPINGS[code]
end

# File app/lib/reports/systm_one_exporter.rb, line 112
def headers
  [
    "Practice code",
    "NHS number",
    "Surname",
    "Middle name",
    "Forename",
    "Gender",
    "Date of Birth",
    "House name",
    "House number and road",
    "Town",
    "Postcode",
    "Vaccination",
    "Part",
    "Admin date",
    "Batch number",
    "Expiry date",
    "Dose",
    "Reason",
    "Site",
    "Method",
    "Notes"
  ]
end

# File app/lib/reports/systm_one_exporter.rb, line 258
def method(vaccination_record)
  return if vaccination_record.not_administered?

  DELIVERY_METHOD_MAPPINGS.fetch(vaccination_record.delivery_method)
end

# File app/lib/reports/systm_one_exporter.rb, line 242
def notes(vaccination_record)
  [
    vaccination_record.notes,
    if (user = vaccination_record.performed_by)
      "Administered by: #{user.full_name}"
    end,
    if (user = vaccination_record.supplied_by)
      if vaccination_record.pgd?
        "Authorised by: #{user.full_name}"
      else
        "Prescribed by: #{user.full_name}"
      end
    end
  ].compact_blank.join("\n")
end

# File app/lib/reports/systm_one_exporter.rb, line 184
def practice_code(vaccination_record)
  location = vaccination_record.location

  if location&.systm_one_code.present?
    location.systm_one_code
  elsif location&.gias_school?
    location.urn
  elsif location
    location.ods_code
  else
    vaccination_record.session.location.ods_code
  end
end

# File app/lib/reports/systm_one_exporter.rb, line 224
def reason(vaccination_record)
  case vaccination_record.dose_sequence
  when 1, nil
    "Routine"
  else
    "At Risk"
  end
end

# File app/lib/reports/systm_one_exporter.rb, line 156
def row(vaccination_record:)
  patient = vaccination_record.patient

  [
    practice_code(vaccination_record), # Practice code
    patient.nhs_number, # NHS number
    patient.family_name, # Surname
    "", # Middle name (not stored)
    patient.given_name, # Forename
    gender_code(patient.gender_code), # Gender
    patient.date_of_birth.to_fs(:uk_short),
    patient.restricted? ? "" : patient.address_line_2, # House name
    patient.restricted? ? "" : patient.address_line_1, # House number and road
    patient.restricted? ? "" : patient.address_town, # Town
    patient.restricted? ? "" : patient.address_postcode, # Postcode
    vaccination(vaccination_record), # Vaccination
    "", # Part
    vaccination_record.performed_at.to_date.to_fs(:uk_short), # Admin date
    vaccination_record.batch_number, # Batch number
    vaccination_record.batch_expiry&.to_fs(:uk_short), # Expiry date
    vaccination_record.dose_volume_ml, # Dose
    reason(vaccination_record), # Reason (not specified)
    site(vaccination_record), # Site
    method(vaccination_record), # Method
    notes(vaccination_record) # Notes
  ]
end

# File app/lib/reports/systm_one_exporter.rb, line 236
def site(vaccination_record)
  return if vaccination_record.not_administered?

  DELIVERY_SITE_MAPPINGS.fetch(vaccination_record.delivery_site)
end

# File app/lib/reports/systm_one_exporter.rb, line 205
def vaccination(vaccination_record)
  return if vaccination_record.not_administered?

  programme = vaccination_record.programme
  vaccine_brand = vaccination_record.vaccine.brand
  dose_sequence = vaccination_record.dose_sequence

  if programme.mmr?
    procedure_mapping =
      PROCEDURE_DOSE_MAPPINGS.dig(programme.variant_type, dose_sequence)
    return procedure_mapping if procedure_mapping.present?
  end

  product_mapping = PRODUCT_DOSE_MAPPINGS.dig(vaccine_brand, dose_sequence)
  return product_mapping if product_mapping.present?

  dose_sequence ? "#{vaccine_brand} Part #{dose_sequence}" : vaccine_brand
end

# File app/lib/reports/systm_one_exporter.rb, line 138
def vaccination_records
  team
    .vaccination_records
    .administered
    .sourced_from_service
    .for_programme(programme)
    .for_academic_year(academic_year)
    .created_or_updated_between(start_date, end_date)
    .includes(
      :location,
      :patient,
      :performed_by_user,
      :session,
      :supplied_by,
      :vaccine
    )
end