# Orchestrates the sync process for a CoinStats connection.
# Imports data, processes holdings, and schedules account syncs.
class CoinstatsItem::Syncer
  include SyncStats::Collector

  attr_reader :coinstats_item

  # @param coinstats_item [CoinstatsItem] Item to sync
  def initialize(coinstats_item)
    @coinstats_item = coinstats_item
  end

  # Runs the full sync workflow: import, process, and schedule.
  # @param sync [Sync] Sync record for status tracking
  def perform_sync(sync)
    # Phase 1: Import data from CoinStats API
    sync.update!(status_text: I18n.t("models.coinstats_item.syncer.importing_wallets")) if sync.respond_to?(:status_text)
    coinstats_item.import_latest_coinstats_data

    # Phase 2: Check account setup status and collect sync statistics
    sync.update!(status_text: I18n.t("models.coinstats_item.syncer.checking_configuration")) if sync.respond_to?(:status_text)
    total_accounts = coinstats_item.coinstats_accounts.count

    linked_accounts = coinstats_item.coinstats_accounts.joins(:account_provider).joins(:account).merge(Account.visible)
    unlinked_accounts = coinstats_item.coinstats_accounts.left_joins(:account_provider).where(account_providers: { id: nil })

    sync_stats = {
      total_accounts: total_accounts,
      linked_accounts: linked_accounts.count,
      unlinked_accounts: unlinked_accounts.count
    }

    if unlinked_accounts.any?
      coinstats_item.update!(pending_account_setup: true)
      sync.update!(status_text: I18n.t("models.coinstats_item.syncer.wallets_need_setup", count: unlinked_accounts.count)) if sync.respond_to?(:status_text)
    else
      coinstats_item.update!(pending_account_setup: false)
    end

    # Phase 3: Process holdings for linked accounts only
    if linked_accounts.any?
      sync.update!(status_text: I18n.t("models.coinstats_item.syncer.processing_holdings")) if sync.respond_to?(:status_text)
      coinstats_item.process_accounts

      # CoinStats provides transactions but not activity labels (Buy, Sell, Dividend, etc.)
      # Warn users that this may affect budget accuracy
      collect_investment_data_quality_warning(sync, linked_accounts)

      # Phase 4: Schedule balance calculations for linked accounts
      sync.update!(status_text: I18n.t("models.coinstats_item.syncer.calculating_balances")) if sync.respond_to?(:status_text)
      coinstats_item.schedule_account_syncs(
        parent_sync: sync,
        window_start_date: sync.window_start_date,
        window_end_date: sync.window_end_date
      )
    end

    if sync.respond_to?(:sync_stats)
      sync.update!(sync_stats: sync_stats)
    end
  end

  # Hook called after sync completion. Currently a no-op.
  def perform_post_sync
    # no-op
  end

  private

    # Collects a data quality warning for all CoinStats accounts.
    # CoinStats cannot provide activity labels (Buy, Sell, Dividend, etc.) for transactions,
    # which may affect budget accuracy.
    def collect_investment_data_quality_warning(sync, linked_coinstats_accounts)
      # All CoinStats accounts are crypto/investment accounts
      return if linked_coinstats_accounts.empty?

      collect_data_quality_stats(sync,
        warnings: linked_coinstats_accounts.size,
        details: [ {
          message: I18n.t("provider_warnings.limited_investment_data"),
          severity: "warning"
        } ]
      )
    end
end