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Fetches 3 list URLs and parses available counts per card\n * - When a card's available count increases, fetches its detail page\n * (with language=1&minCondition=3)\n * - Stores/updates listings in SQLite (current state only, no history rows)\n * - Sends email for new listings and price changes\n *\n * CONFIGURATION:\n * Set NOTIFICATION_EMAIL below to receive alerts at a specific address.\n * Leave it as \"\" to send to your Val.town account email.\n */\n\nimport { sqlite } from \"https://esm.town/v/std/sqlite\";\nimport { email } from \"https://esm.town/v/std/email\";\nimport { load } from \"https://esm.sh/cheerio@1.0.0-rc.12\";\n\n// ---------------------------------------------------------------------------\n// ✏️ Configuration — edit these\n// ---------------------------------------------------------------------------\n\n/** Email address to receive alerts. Leave \"\" for your Val.town account email. */\nconst NOTIFICATION_EMAIL = \"\";\n\n/**\n * Max number of uninitialized (never-seeded) cards to fetch detail pages for\n * per run. Keeps the initial seeding spread across multiple runs to avoid\n * hammering the site. Already-initialized cards that show a count increase\n * are always fetched (expected to be 0–2 per run in steady state).\n */\nconst SEED_BATCH_SIZE = 5;\n\nconst LIST_URLS = [\n \"https://www.cardmarket.com/en/Pokemon/Products/Singles/Skyridge?mode=list&searchMode=v2&idCategory=51&idExpansion=1538&idRarity=49&sortBy=price_desc&perSite=30\",\n \"https://www.cardmarket.com/en/Pokemon/Products/Singles/Skyridge?mode=list&searchMode=v2&idCategory=51&idExpansion=1538&idRarity=48&sortBy=price_desc&perSite=30\",\n \"https://www.cardmarket.com/en/Pokemon/Products/Singles/Skyridge?mode=list&searchMode=v2&idCategory=51&idExpansion=1538&idRarity=44&sortBy=price_desc&perSite=30\",\n];\n\nconst FETCH_HEADERS: Record = {\n \"User-Agent\":\n \"Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/124.0.0.0 Safari/537.36\",\n Accept:\n \"text/html,application/xhtml+xml,application/xml;q=0.9,image/avif,image/webp,*/*;q=0.8\",\n \"Accept-Language\": \"en-US,en;q=0.9\",\n \"Cache-Control\": \"no-cache\",\n Pragma: \"no-cache\",\n};\n\n// ---------------------------------------------------------------------------\n// Types\n// ---------------------------------------------------------------------------\n\ninterface CardAvailability {\n cardUrl: string; // canonical URL without query params\n cardName: string;\n availableCount: number;\n}\n\ninterface CardListing {\n cardUrl: string;\n cardName: string;\n seller: string;\n condition: string;\n language: string;\n comment: string;\n price: number;\n quantity: number;\n}\n\n// ---------------------------------------------------------------------------\n// Database\n// ---------------------------------------------------------------------------\n\nasync function initDB() {\n await sqlite.execute(`\n CREATE TABLE IF NOT EXISTS availability_state (\n card_url TEXT PRIMARY KEY,\n card_name TEXT NOT NULL,\n avail_count INTEGER NOT NULL,\n last_checked TEXT NOT NULL,\n seeded INTEGER NOT NULL DEFAULT 0\n )\n `);\n // Add seeded column to existing tables created before this migration\n await sqlite.execute(`\n ALTER TABLE availability_state ADD COLUMN seeded INTEGER NOT NULL DEFAULT 0\n `).catch(() => {}); // ignore \"duplicate column\" error\n\n await sqlite.execute(`\n CREATE TABLE IF NOT EXISTS card_listings (\n listing_key TEXT PRIMARY KEY,\n card_url TEXT NOT NULL,\n card_name TEXT NOT NULL,\n seller TEXT NOT NULL,\n condition TEXT NOT NULL,\n language TEXT NOT NULL,\n comment TEXT NOT NULL DEFAULT '',\n price REAL NOT NULL,\n quantity INTEGER NOT NULL,\n first_seen TEXT NOT NULL,\n last_updated TEXT NOT NULL\n )\n `);\n await sqlite.execute(`\n ALTER TABLE card_listings ADD COLUMN comment TEXT NOT NULL DEFAULT ''\n `).catch(() => {});\n}\n\nasync function getCardState(\n cardUrl: string,\n): Promise<{ availCount: number; seeded: boolean } | null> {\n const res = await sqlite.execute({\n sql:\n \"SELECT avail_count, seeded FROM availability_state WHERE card_url = ?\",\n args: [cardUrl],\n });\n if (res.rows.length === 0) return null;\n return {\n availCount: res.rows[0][0] as number,\n seeded: !!(res.rows[0][1] as number),\n };\n}\n\nasync function markSeeded(cardUrl: string) {\n await sqlite.execute({\n sql: \"UPDATE availability_state SET seeded = 1 WHERE card_url = ?\",\n args: [cardUrl],\n });\n}\n\nasync function upsertAvailability(card: CardAvailability, now: string) {\n await sqlite.execute({\n sql: `\n INSERT INTO availability_state (card_url, card_name, avail_count, last_checked)\n VALUES (?, ?, ?, ?)\n ON CONFLICT(card_url) DO UPDATE SET\n card_name = excluded.card_name,\n avail_count = excluded.avail_count,\n last_checked = excluded.last_checked\n `,\n args: [card.cardUrl, card.cardName, card.availableCount, now],\n });\n}\n\nasync function getExistingListingsForCard(cardUrl: string): Promise<\n Array<{\n listing_key: string;\n seller: string;\n condition: string;\n language: string;\n comment: string;\n price: number;\n quantity: number;\n }>\n> {\n const res = await sqlite.execute({\n sql:\n \"SELECT listing_key, seller, condition, language, comment, price, quantity FROM card_listings WHERE card_url = ?\",\n args: [cardUrl],\n });\n return res.rows.map((r) => ({\n listing_key: r[0] as string,\n seller: r[1] as string,\n condition: r[2] as string,\n language: r[3] as string,\n comment: r[4] as string,\n price: r[5] as number,\n quantity: r[6] as number,\n }));\n}\n\nasync function insertListing(key: string, l: CardListing, now: string) {\n await sqlite.execute({\n sql: `\n INSERT INTO card_listings\n (listing_key, card_url, card_name, seller, condition, language, comment,\n price, quantity, first_seen, last_updated)\n VALUES (?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?)\n `,\n args: [\n key,\n l.cardUrl,\n l.cardName,\n l.seller,\n l.condition,\n l.language,\n l.comment,\n l.price,\n l.quantity,\n now,\n now,\n ],\n });\n}\n\nasync function updateListing(\n key: string,\n language: string,\n comment: string,\n price: number,\n quantity: number,\n now: string,\n) {\n await sqlite.execute({\n sql:\n `UPDATE card_listings SET language = ?, comment = ?, price = ?, quantity = ?, last_updated = ? WHERE listing_key = ?`,\n args: [language, comment, price, quantity, now, key],\n });\n}\n\n// ---------------------------------------------------------------------------\n// HTTP\n// ---------------------------------------------------------------------------\n\nfunction sleep(ms: number): Promise {\n return new Promise((resolve) => setTimeout(resolve, ms));\n}\n\n/** Random delay between min and max milliseconds */\nfunction randomDelay(minMs: number, maxMs: number): Promise {\n return sleep(minMs + Math.random() * (maxMs - minMs));\n}\n\nasync function fetchPage(url: string): Promise {\n const res = await fetch(url, { headers: FETCH_HEADERS });\n if (!res.ok) throw new Error(`HTTP ${res.status} ${res.statusText} — ${url}`);\n return res.text();\n}\n\n// ---------------------------------------------------------------------------\n// Parsers (selectors verified against real Cardmarket HTML)\n// ---------------------------------------------------------------------------\n\n/**\n * Parse the Cardmarket product list page.\n *\n * Real HTML structure (confirmed):\n * .table-body\n * div.row.g-0 #productRow{id} ← one per card\n * [data-testid=\"name\"] a ← card name + link\n * [data-testid=\"availability\"] span ← available count (number only)\n */\nfunction parseListPage(html: string): CardAvailability[] {\n const $ = load(html);\n const cards: CardAvailability[] = [];\n\n $(\".table-body .row.g-0\").each((_, row) => {\n const id = $(row).attr(\"id\") ?? \"\";\n if (!id.startsWith(\"productRow\")) return;\n\n const nameEl = $(row).find('[data-testid=\"name\"] a').first();\n const name = nameEl.text().trim();\n const href = nameEl.attr(\"href\") ?? \"\";\n if (!name || !href) return;\n\n // Strip query params — we add language=1&minCondition=3 ourselves\n const rawUrl = href.startsWith(\"http\")\n ? href\n : `https://www.cardmarket.com${href}`;\n const cardUrl = rawUrl.split(\"?\")[0];\n\n // Available count is in a inside the [data-testid=\"availability\"] div\n const availText = $(row).find('[data-testid=\"availability\"] span').first()\n .text().trim();\n const availableCount = parseInt(availText, 10) || 0;\n\n cards.push({ cardUrl, cardName: name, availableCount });\n });\n\n return cards;\n}\n\n/**\n * Parse offer listings from a card detail page.\n *\n * Real HTML structure (confirmed):\n * .table-body\n * div.row.g-0.article-row #articleRow{id}\n * .col-sellerProductInfo\n * .col-seller\n * .seller-name a ← seller username\n * .col-product\n * .product-attributes\n * a.article-condition .badge ← \"EX\" / \"NM\" etc.\n * span.icon.me-2[aria-label] ← language name\n * .col-offer\n * .price-container\n * span.color-primary.fw-bold ← \"3,90 €\"\n * .amount-container\n * span.item-count ← quantity\n */\nfunction parseDetailPage(\n html: string,\n cardUrl: string,\n cardName: string,\n): CardListing[] {\n const $ = load(html);\n const listings: CardListing[] = [];\n\n $(\".table-body .row.g-0.article-row\").each((_, row) => {\n const seller = $(row).find(\".seller-name a\").first().text().trim();\n const condition = $(row).find(\"a.article-condition .badge\").first().text()\n .trim();\n\n // Language icon: .icon span with onmouseover=\"showMsgBox(this,`English`)\"\n // aria-label may not be present in server-rendered HTML; use onmouseover or data-original-title\n const langEl = $(row)\n .find(\".product-attributes .icon\")\n .filter((_, el) => /showMsgBox/.test($(el).attr(\"onmouseover\") ?? \"\"))\n .first();\n const language = (() => {\n if (langEl.length) {\n const mo = langEl.attr(\"onmouseover\") ?? \"\";\n const m = mo.match(/`([^`]+)`/);\n if (m) return m[1];\n }\n // fallbacks\n const lbl = langEl.attr(\"aria-label\") ||\n langEl.attr(\"data-original-title\") || \"\";\n return lbl && !lbl.startsWith(\"<\") ? lbl : \"Unknown\";\n })();\n\n // Price: inside .col-offer .price-container — European format \"1.250,00 €\"\n // Thousands separator is `.`, decimal separator is `,`\n const priceRaw = $(row)\n .find(\".col-offer .price-container .color-primary.fw-bold\")\n .first()\n .text()\n .trim();\n const priceStr = priceRaw\n .replace(/\\s/g, \"\") // remove whitespace\n .replace(/[^\\d.,]/g, \"\") // strip € and other chars\n .replace(/\\./g, \"\") // remove thousands-separator dots\n .replace(\",\", \".\"); // decimal comma → dot\n const price = parseFloat(priceStr);\n if (!priceStr || isNaN(price) || price <= 0) return;\n\n // Comment/description: free-text in product-comments column (e.g. \"PSA 7 - Swirl\")\n // Prefer data-bs-original-title (full text, not truncated) over text content\n const commentEl = $(row).find(\".product-comments .d-none.d-lg-block span\")\n .first();\n const comment =\n (commentEl.attr(\"data-bs-original-title\") || commentEl.text()).trim();\n\n // Quantity: inside .col-offer .amount-container\n const qtyRaw = $(row)\n .find(\".col-offer .amount-container .item-count\")\n .first()\n .text()\n .trim();\n const quantity = parseInt(qtyRaw, 10) || 1;\n\n if (!seller) return;\n\n listings.push({\n cardUrl,\n cardName,\n seller,\n condition,\n language,\n comment,\n price,\n quantity,\n });\n });\n\n return listings;\n}\n\n// ---------------------------------------------------------------------------\n// Helpers\n// ---------------------------------------------------------------------------\n\nfunction buildDetailUrl(cardUrl: string): string {\n try {\n const u = new URL(cardUrl);\n u.searchParams.set(\"language\", \"1\");\n u.searchParams.set(\"minCondition\", \"3\");\n return u.toString();\n } catch {\n return `${cardUrl}?language=1&minCondition=3`;\n }\n}\n\nfunction buildEmailBody(\n newListings: CardListing[],\n priceChanges: Array<{ listing: CardListing; oldPrice: number }>,\n): string {\n const lines: string[] = [];\n\n if (newListings.length > 0) {\n lines.push(`NEW LISTINGS (${newListings.length})`);\n lines.push(\"=\".repeat(60));\n for (const l of newListings) {\n lines.push(`${l.cardName}`);\n lines.push(\n ` ${l.seller} | ${l.condition} | ${l.language} | €${\n l.price.toFixed(2)\n } | Qty: ${l.quantity}${l.comment ? ` | ${l.comment}` : \"\"}`,\n );\n lines.push(` ${buildDetailUrl(l.cardUrl)}`);\n lines.push(\"\");\n }\n }\n\n if (priceChanges.length > 0) {\n lines.push(`PRICE CHANGES (${priceChanges.length})`);\n lines.push(\"=\".repeat(60));\n for (const { listing: l, oldPrice } of priceChanges) {\n const diff = l.price - oldPrice;\n const sign = diff > 0 ? \"+\" : \"\";\n lines.push(`${l.cardName}`);\n lines.push(\n ` ${l.seller} | ${l.condition} | ${l.language}${\n l.comment ? ` | ${l.comment}` : \"\"\n }`,\n );\n lines.push(\n ` Price: €${oldPrice.toFixed(2)} → €${l.price.toFixed(2)} (${sign}€${\n diff.toFixed(2)\n })`,\n );\n lines.push(` ${buildDetailUrl(l.cardUrl)}`);\n lines.push(\"\");\n }\n }\n\n return lines.join(\"\\n\");\n}\n\n// ---------------------------------------------------------------------------\n// Main (Val.town cron — set interval to */10 * * * *)\n// ---------------------------------------------------------------------------\n\nexport default async function monitor() {\n await initDB();\n\n const now = new Date().toISOString();\n const newListings: CardListing[] = [];\n const priceChanges: Array<{ listing: CardListing; oldPrice: number }> = [];\n let seedCount = 0; // detail fetches used for seeding this run\n\n for (const [i, listUrl] of LIST_URLS.entries()) {\n if (i > 0) await randomDelay(3000, 6000);\n\n let listHtml: string;\n try {\n listHtml = await fetchPage(listUrl);\n } catch (err) {\n console.error(`[monitor] Failed to fetch list page: ${listUrl}`, err);\n continue;\n }\n\n const cards = parseListPage(listHtml);\n console.log(`[monitor] ${listUrl} → ${cards.length} cards found`);\n\n for (const card of cards) {\n const prev = await getCardState(card.cardUrl);\n await upsertAvailability(card, now);\n\n const notSeeded = prev === null || !prev.seeded;\n\n if (notSeeded) {\n // Never had listings fetched — need to seed\n if (seedCount >= SEED_BATCH_SIZE) {\n console.log(\n `[monitor] ${card.cardName}: not yet seeded, batch full, deferring`,\n );\n continue;\n }\n seedCount++;\n } else if (!(card.availableCount > prev.availCount)) {\n // Already seeded: only fetch if count went up\n console.log(\n `[monitor] ${card.cardName}: ${card.availableCount} (no increase), skip`,\n );\n continue;\n }\n\n const reason = notSeeded\n ? `seeding (${seedCount}/${SEED_BATCH_SIZE})`\n : `${prev!.availCount} → ${card.availableCount}`;\n console.log(`[monitor] ${card.cardName}: ${reason}, fetching detail`);\n\n // Throttle detail fetches to avoid triggering bot detection\n await randomDelay(2500, 5000);\n\n const detailUrl = buildDetailUrl(card.cardUrl);\n let detailHtml: string;\n try {\n detailHtml = await fetchPage(detailUrl);\n } catch (err) {\n console.error(`[monitor] Failed to fetch detail: ${detailUrl}`, err);\n continue;\n }\n\n const listings = parseDetailPage(detailHtml, card.cardUrl, card.cardName);\n console.log(\n `[monitor] ${card.cardName}: ${listings.length} listings parsed`,\n );\n\n // Mark seeded after successful detail fetch\n await markSeeded(card.cardUrl);\n\n // Match new listings to existing ones by closest price within the same\n // seller+condition+language+comment group (handles sellers with multiple\n // listings that have the same attributes but different prices).\n const existingForCard = await getExistingListingsForCard(card.cardUrl);\n const available = new Map(existingForCard.map((e) => [e.listing_key, e]));\n\n for (const listing of listings) {\n const pickClosest = (pool: typeof existingForCard) => {\n if (pool.length === 0) return null;\n pool.sort((a, b) =>\n Math.abs(a.price - listing.price) -\n Math.abs(b.price - listing.price)\n );\n return pool[0];\n };\n\n // 1. Exact match: seller + condition + language + comment\n let pool = [...available.values()].filter(\n (e) =>\n e.seller === listing.seller &&\n e.condition === listing.condition &&\n e.language === listing.language &&\n e.comment === listing.comment,\n );\n // 2. Fallback: ignore comment (handles comment field migration)\n if (pool.length === 0) {\n pool = [...available.values()].filter(\n (e) =>\n e.seller === listing.seller &&\n e.condition === listing.condition &&\n e.language === listing.language,\n );\n }\n // 3. Fallback: ignore language + comment (handles language field migration)\n if (pool.length === 0) {\n pool = [...available.values()].filter(\n (e) =>\n e.seller === listing.seller && e.condition === listing.condition,\n );\n }\n\n const matched = pickClosest(pool);\n if (matched) available.delete(matched.listing_key);\n\n if (!matched) {\n // Truly new listing — include price in key to ensure uniqueness\n const key = [\n listing.cardUrl,\n listing.seller,\n listing.condition,\n listing.language,\n listing.comment,\n Math.round(listing.price * 100),\n ].join(\"||\");\n await insertListing(key, listing, now);\n if (!notSeeded) newListings.push(listing);\n } else if (Math.abs(matched.price - listing.price) >= 0.005) {\n await updateListing(\n matched.listing_key,\n listing.language,\n listing.comment,\n listing.price,\n listing.quantity,\n now,\n );\n priceChanges.push({ listing, oldPrice: matched.price });\n } else {\n // Always sync language/comment/quantity in case they improved\n await updateListing(\n matched.listing_key,\n listing.language,\n listing.comment,\n listing.price,\n listing.quantity,\n now,\n );\n }\n }\n }\n }\n\n if (newListings.length > 0 || priceChanges.length > 0) {\n const parts = [\n newListings.length > 0\n ? `${newListings.length} new listing${\n newListings.length !== 1 ? \"s\" : \"\"\n }`\n : null,\n priceChanges.length > 0\n ? `${priceChanges.length} price change${\n priceChanges.length !== 1 ? \"s\" : \"\"\n }`\n : null,\n ].filter(Boolean);\n\n const subject = `Cardmarket Skyridge Alert: ${parts.join(\" | \")}`;\n const text = buildEmailBody(newListings, priceChanges);\n\n const emailOpts: { subject: string; text: string; to?: string } = {\n subject,\n text,\n };\n if (NOTIFICATION_EMAIL) emailOpts.to = NOTIFICATION_EMAIL;\n\n await email(emailOpts);\n console.log(`[monitor] Email sent — ${subject}`);\n } else {\n console.log(\"[monitor] No changes detected.\");\n }\n\n return {\n newListings: newListings.length,\n priceChanges: priceChanges.length,\n checkedAt: now,\n };\n}","deleted","label",[100],"permalink","https://www.val.town/x/noahhai/cm/code/main.ts","extension","actionData","errors"]