/**
 * Turns an export of first-party custom avatar items into a D1 migration that seeds the
 * `custom_avatar_item` table with them, one `INSERT` per record, the way
 * `apps/rooms/migrations/0002_import_rooms.sql` seeds the rooms.
 *
 *   bun apps/api/scripts/import-custom-avatar-items.ts <export.json> <NNNN>
 *
 * `export.json` is a JSON array of `CustomAvatarItem` records as the official service serves
 * them (a `{ Results: [...] }` page or a single record are accepted too). `NNNN` is the
 * migration number; the file is written to `apps/api/migrations/NNNN_import_custom_avatar_items.sql`.
 *
 * Each record is stored VERBATIM as the row's JSON (the table is a JSON blob per row, see
 * src/custom-avatar-items-db.ts) minus `PurchaseInfo`, which is a store-side projection and
 * never stored. A record whose id is already present is REPLACED, so re-running an import
 * with corrected data lands; a `DELETE` is not issued, so player-made items and previously
 * imported items the new export lacks are left alone.
 *
 * The saves name assetbundles and thumbnails by bare filename; the migration does nothing
 * about those files, which have to be served from wherever the client fetches them.
 */

import { readFileSync, writeFileSync } from 'node:fs'

interface Record_ {
	CustomAvatarItemId: string
	PurchaseInfo?: unknown
	[key: string]: unknown
}

const [input, number] = process.argv.slice(2)
if (!input || !number || !/^\d{4}$/.test(number)) {
	console.error('usage: bun apps/api/scripts/import-custom-avatar-items.ts <export.json> <NNNN>')
	process.exit(2)
}

const parsed: unknown = JSON.parse(readFileSync(input, 'utf8'))
const records: Record_[] = Array.isArray(parsed)
	? parsed
	: parsed && typeof parsed === 'object' && Array.isArray((parsed as { Results?: unknown }).Results)
		? (parsed as { Results: Record_[] }).Results
		: [parsed as Record_]

const seen = new Set<string>()
const lines: string[] = [
	`-- Seed first-party custom avatar items (${records.length} records) from ${input.split('/').pop()}.`,
	'-- Generated by apps/api/scripts/import-custom-avatar-items.ts — do not edit by hand.',
	'-- Each record is the official `CustomAvatarItem` verbatim; an existing id is replaced.',
	'',
]
for (const record of records) {
	if (typeof record.CustomAvatarItemId !== 'string' || record.CustomAvatarItemId === '') {
		throw new Error(`record without a CustomAvatarItemId: ${JSON.stringify(record).slice(0, 80)}`)
	}
	if (seen.has(record.CustomAvatarItemId)) {
		throw new Error(`duplicate CustomAvatarItemId in export: ${record.CustomAvatarItemId}`)
	}
	seen.add(record.CustomAvatarItemId)
	const { PurchaseInfo: _purchaseInfo, ...stored } = record
	const json = JSON.stringify(stored).replaceAll("'", "''")
	lines.push(
		`INSERT INTO custom_avatar_item (data) VALUES ('${json}') ON CONFLICT(custom_avatar_item_id) DO UPDATE SET data = excluded.data;`
	)
}

const out = decodeURIComponent(
	new URL(`../migrations/${number}_import_custom_avatar_items.sql`, import.meta.url).pathname
)
writeFileSync(out, lines.join('\n') + '\n')
console.log(`wrote ${records.length} records to ${out}`)