module AbsPopulation

# File lib/abs_population.rb, line 13
def cities
  @cities ||= JSON.parse(File.read(DATA_PATH))
end

# File lib/abs_population.rb, line 21
def find_city(query)
  key = query.to_s.strip.downcase.gsub(/[^a-z]/, "")
  return nil if key.empty?

  cities[key] || cities.values.find do |row|
    row["name"].to_s.downcase.include?(key) || key.include?(row["name"].to_s.downcase.gsub(/[^a-z]/, ""))
  end
end

# File lib/abs_population.rb, line 50
def format_number(value)
  value.to_i.to_s.reverse.gsub(/(\d{3})(?=\d)/, '\\1,').reverse
end

# File lib/abs_population.rb, line 35
def format_population(query, fetch: nil)
  row = find_city(query)
  lines = [
    IrcFormat.report_header(tag: "ABS", title: "Population · #{query}", style: STYLE_TITLE)
  ]
  if row.nil?
    lines << "City not found — try Perth, Sydney, Melbourne, Brisbane, Gold Coast, Newcastle"
  else
    pop = population_for(row, fetch: fetch)
    lines << "#{row['name']} (#{row['state']}) — #{format_number(pop)} people (ERP)"
  end
  lines << IrcFormat.report_footer("estimated resident population", "Australian Bureau of Statistics")
  lines.join("\n")
end

# File lib/abs_population.rb, line 30
def population_for(row, fetch: nil)
  live = AbsApi.fetch_population(row, fetch: fetch)
  live&.positive? ? live : row["population"].to_i
end

# File lib/abs_population.rb, line 17
def reset_cities!
  @cities = nil
end