import { PoolClient } from 'pg';
import { DraftOutcome } from './draftListing';

/**
 * Writes a finished draft to the database.
 *
 * The copy goes on `item_drafts`, never on the item. The item keeps its
 * placeholder name and description until a person approves them in the review
 * queue (#225) — nothing a model wrote reaches the catalogue unreviewed.
 *
 * The price is the deliberate exception, because #220 chose to price an item on
 * arrival rather than leave it unpriced. `price_source` records that the number
 * came from a model rather than a person, which is what lets the review queue
 * show it as unconfirmed.
 */
export async function applyDraft(
  client: PoolClient,
  itemId: number,
  outcome: DraftOutcome
): Promise<void> {
  const { draft } = outcome;

  // Checked against the real table before it is stored. The schema constrains
  // the shape of the answer but cannot enforce membership, and a category the
  // shop does not have would be invisible to every storefront filter — a draft
  // nobody could find, rather than an obvious error.
  const categoryId = draft.category === null
    ? null
    : (
        await client.query<{ id: number }>(
          `SELECT id FROM categories WHERE lower(name) = lower($1)`,
          [draft.category]
        )
      ).rows[0]?.id ?? null;

  const hasPrice = draft.suggestedPriceCents !== null;

  await client.query(
    `UPDATE item_drafts
     SET state = 'ready',
         model = $2,
         ai_name = $3,
         ai_description = $4,
         ai_category_id = $5,
         ai_tag_names = $6,
         ai_suggested_price_cents = $7,
         price_source = $8,
         input_tokens = $9,
         output_tokens = $10,
         cost_micros = $11,
         ai_error = NULL,
         drafted_at = now()
     WHERE item_id = $1`,
    [
      itemId,
      outcome.model,
      draft.name,
      draft.description,
      categoryId,
      draft.tags,
      draft.suggestedPriceCents,
      hasPrice ? 'ai' : 'default',
      outcome.inputTokens,
      outcome.outputTokens,
      outcome.costMicros
    ]
  );

  // Only when there is one. Absent, the item keeps the migration's default and
  // price_source stays 'default' — the review queue shows both the same way, as
  // a number nobody has chosen yet.
  if (hasPrice) {
    await client.query(`UPDATE items SET price_cents = $2 WHERE id = $1`, [
      itemId,
      draft.suggestedPriceCents
    ]);
  }
}