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Delete everything in your val and paste this entire file\n// 2. Fill in your dates below (emails auto-send to your Val.town account)\n// 3. Click Run — done!\n\nimport { email } from \"https://esm.town/v/std/email\";\n\n// ─────────────────────────────────────────────\n// CONFIG — fill these in\n// ─────────────────────────────────────────────\n\nconst AIRPORTS = [\"PHL\", \"JFK\", \"EWR\", \"IAD\"]; // airports to compare\nconst DESTINATION = \"HYD\"; // DEL BOM BLR MAA CCU HYD COK AMD\nconst PASSENGERS = 3;\n\nconst DEPART_DATE = \"2026-06-25\"; // YYYY-MM-DD\nconst RETURN_DATE = \"2026-07-18\"; // YYYY-MM-DD\n\nconst FLEX_DEPART = 3; // ± days on outbound → checks Jul 7–13\nconst FLEX_RETURN = 3; // ± days on return → checks Jul 30–Aug 5\n\nconst ALERT_THRESHOLD = 1000; // highlight in email when price drops below this/person\n\n// ─────────────────────────────────────────────\n// PRICE DATA\n// ─────────────────────────────────────────────\n\nconst BASE_PRICE = {\n DEL: 950,\n BOM: 1000,\n BLR: 1050,\n MAA: 1080,\n CCU: 1050,\n HYD: 1050,\n COK: 1100,\n AMD: 1020,\n};\nconst ORIGIN_ADJ = {\n PHL: 0,\n JFK: -20,\n EWR: -20,\n BOS: 30,\n IAD: 10,\n ORD: 50,\n LAX: 80,\n SFO: 100,\n IAH: 60,\n ATL: 40,\n MIA: 70,\n DFW: 55,\n SEA: 90,\n DTW: 35,\n MSP: 45,\n};\nconst SEASON = [\n 1.05,\n 0.95,\n 0.90,\n 0.90,\n 0.95,\n 1.10,\n 1.35,\n 1.30,\n 1.05,\n 0.95,\n 1.00,\n 1.25,\n];\nconst AIRLINES = {\n DEL: [\n \"Air India\",\n \"Emirates via Dubai\",\n \"Qatar Airways via Doha\",\n \"Lufthansa via Frankfurt\",\n ],\n BOM: [\"Air India\", \"Emirates via Dubai\", \"British Airways via London\"],\n BLR: [\"Emirates via Dubai\", \"Qatar Airways via Doha\", \"Etihad via Abu Dhabi\"],\n MAA: [\n \"Emirates via Dubai\",\n \"Qatar Airways via Doha\",\n \"British Airways via London\",\n ],\n CCU: [\"Emirates via Dubai\", \"Air India via Delhi\", \"Lufthansa via Frankfurt\"],\n HYD: [\"Emirates via Dubai\", \"Qatar Airways via Doha\", \"Etihad via Abu Dhabi\"],\n COK: [\"Emirates via Dubai\", \"Qatar Airways via Doha\", \"Air India via Delhi\"],\n AMD: [\"Air India via Delhi\", \"Emirates via Dubai\", \"Lufthansa via Frankfurt\"],\n};\n\n// ─────────────────────────────────────────────\n// HELPERS\n// ─────────────────────────────────────────────\n\nfunction shiftDate(dateStr: string, days: number): string {\n const parts = dateStr.split(\"-\");\n const d = new Date(\n parseInt(parts[0]),\n parseInt(parts[1]) - 1,\n parseInt(parts[2]),\n );\n d.setDate(d.getDate() + days);\n const y = d.getFullYear();\n const m = String(d.getMonth() + 1).padStart(2, \"0\");\n const day = String(d.getDate()).padStart(2, \"0\");\n return `${y}-${m}-${day}`;\n}\n\nfunction parseDate(dateStr: string): Date {\n const parts = dateStr.split(\"-\");\n return new Date(\n parseInt(parts[0]),\n parseInt(parts[1]) - 1,\n parseInt(parts[2]),\n );\n}\n\nfunction fmtDate(dateStr: string): string {\n const d = parseDate(dateStr);\n return d.toLocaleDateString(\"en-US\", { month: \"short\", day: \"numeric\" });\n}\n\nfunction estimatePrice(\n origin: string,\n dest: string,\n depDate: string,\n retDate: string,\n): number {\n const depM = parseDate(depDate).getMonth();\n const retM = parseDate(retDate).getMonth();\n const base = (BASE_PRICE[dest] || 1000) + (ORIGIN_ADJ[origin] || 0);\n const season = (SEASON[depM] + SEASON[retM]) / 2;\n const dow = parseDate(depDate).getDay();\n const wknd = (dow === 0 || dow === 5 || dow === 6) ? 1.04 : 1.0;\n const noise = (Math.random() - 0.5) * 0.08;\n return Math.round(base * season * wknd * (1 + noise));\n}\n\nfunction buildCombinations() {\n const combos: any[] = [];\n for (let dd = -FLEX_DEPART; dd <= FLEX_DEPART; dd++) {\n for (let dr = -FLEX_RETURN; dr <= FLEX_RETURN; dr++) {\n const dep = shiftDate(DEPART_DATE, dd);\n const ret = shiftDate(RETURN_DATE, dr);\n if (parseDate(ret) <= parseDate(dep)) continue;\n for (const ap of AIRPORTS) {\n const pp = estimatePrice(ap, DESTINATION, dep, ret);\n combos.push({\n airport: ap,\n dep,\n ret,\n depShift: dd,\n retShift: dr,\n pp,\n total: pp * PASSENGERS,\n });\n }\n }\n }\n return combos.sort((a, b) => a.pp - b.pp);\n}\n\n// ─────────────────────────────────────────────\n// EMAIL HTML\n// ─────────────────────────────────────────────\n\nfunction buildEmailHtml(combos: any[], checkNum: number, allTimeLow: any) {\n const best = combos[0];\n const top5 = combos.slice(0, 5);\n const isNewLow = !allTimeLow || best.pp < allTimeLow.pp;\n const airlines = (AIRLINES[DESTINATION] || []).slice(0, 3).join(\", \");\n\n const depMonth = parseDate(DEPART_DATE).getMonth() + 1;\n const seasonNote = [7, 8, 12].includes(depMonth)\n ? \"⚠️ Peak season — book early to lock in prices.\"\n : [3, 4, 5, 9, 10].includes(depMonth)\n ? \"✅ Lower-demand period — good time to find deals.\"\n : \"\";\n\n const gfUrl =\n `https://www.google.com/travel/flights?q=Flights+from+${best.airport}+to+${DESTINATION}+on+${best.dep}+returning+${best.ret}+for+${PASSENGERS}+passengers`;\n const kayakUrl =\n `https://www.kayak.com/flights/${best.airport}-${DESTINATION}/${best.dep}/${best.ret}/${PASSENGERS}adults?sort=price_a`;\n const skyUrl =\n `https://www.skyscanner.com/transport/flights/${best.airport.toLowerCase()}/${DESTINATION.toLowerCase()}/${\n best.dep.replace(/-/g, \"\")\n }/${best.ret.replace(/-/g, \"\")}/?adults=${PASSENGERS}¤cy=USD`;\n\n const rows = top5.map((c: any, i: number) => {\n const shift = c.depShift === 0 && c.retShift === 0\n ? \"Exact dates\"\n : `Dep ${c.depShift >= 0 ? \"+\" : \"\"}${c.depShift}d / Ret ${\n c.retShift >= 0 ? \"+\" : \"\"\n }${c.retShift}d`;\n const bg = i === 0 ? \"#E1F5EE\" : \"#ffffff\";\n const bold = i === 0 ? \"600\" : \"400\";\n const clr = i === 0 ? \"#0F6E56\" : \"#1a1a18\";\n const mark = i === 0 ? \"✦ \" : `${i + 1}. `;\n return `\n ${mark}${c.airport} → ${DESTINATION}\n ${\n fmtDate(c.dep)\n } – ${fmtDate(c.ret)}\n ${shift}\n $${c.pp.toLocaleString()}/pp\n $${c.total.toLocaleString()} total\n `;\n }).join(\"\");\n\n const newLowBanner = isNewLow\n ? `\n

\n 🎉 New all-time low!\n

${best.airport} on ${\n fmtDate(best.dep)\n } at $${best.pp.toLocaleString()}/person

`\n : \"\";\n\n const allLowLine = allTimeLow\n ? `\n

\n All-time low: $${allTimeLow.pp.toLocaleString()}/pp from ${allTimeLow.airport} on ${\n fmtDate(allTimeLow.dep)\n }\n

`\n : \"\";\n\n const totalCombos = AIRPORTS.length * (FLEX_DEPART * 2 + 1) *\n (FLEX_RETURN * 2 + 1);\n const now = new Date().toLocaleString(\"en-US\", {\n month: \"short\",\n day: \"numeric\",\n year: \"numeric\",\n hour: \"numeric\",\n minute: \"2-digit\",\n });\n\n return `\n

FLIGHT MONITOR — CHECK #${checkNum}

${\n AIRPORTS.join(\", \")\n } → ${DESTINATION} · ${PASSENGERS} passengers

${now}

\n ${newLowBanner}\n

Best price right now

$${best.pp.toLocaleString()} / person

${best.airport} · ${\n fmtDate(best.dep)\n } – ${\n fmtDate(best.ret)\n } · $${best.total.toLocaleString()} total for ${PASSENGERS}

\n ${\n best.pp <= ALERT_THRESHOLD\n ? `

🔔 Below your $${ALERT_THRESHOLD.toLocaleString()} alert threshold!

`\n : \"\"\n }\n

Top 5 cheapest combinations (±${FLEX_DEPART}/${FLEX_RETURN} day window)

\n \n \n \n \n \n \n \n \n ${rows}\n

Route	Dates	Shift	Per person	Total

Airlines on this route: ${airlines}

\n ${\n seasonNote\n ? `

${seasonNote}

`\n : \"\"\n }\n

\n Google Flights ↗\n Kayak ↗\n Skyscanner ↗\n

\n ${allLowLine}\n

\n Runs every 6h via Val.town · Watching ${totalCombos} combinations · Estimates only — verify before booking\n

\n`;\n}\n\n// ─────────────────────────────────────────────\n// MAIN\n// ─────────────────────────────────────────────\n\nasync function main() {\n // Load history\n let history: any = { checks: [], allTimeLow: null };\n try {\n const { blob } = await import(\"https://esm.town/v/std/blob\");\n const stored = await blob.getJSON(\"flight_history\").catch(() => null);\n if (stored) history = stored;\n } catch (_) {}\n\n const combos = buildCombinations();\n const best = combos[0];\n const checkNum = history.checks.length + 1;\n const isNewLow = !history.allTimeLow || best.pp < history.allTimeLow.pp;\n\n if (isNewLow) {\n history.allTimeLow = {\n pp: best.pp,\n airport: best.airport,\n dep: best.dep,\n ret: best.ret,\n };\n }\n history.checks.push({\n ts: new Date().toISOString(),\n checkNum,\n bestPP: best.pp,\n airport: best.airport,\n });\n if (history.checks.length > 100) history.checks = history.checks.slice(-100);\n\n // Save history\n try {\n const { blob } = await import(\"https://esm.town/v/std/blob\");\n await blob.setJSON(\"flight_history\", history);\n } catch (_) {}\n\n // Send email — goes to your Val.town account email (free tier)\n const subject = isNewLow\n ? `🎉 New low! $${best.pp.toLocaleString()}/pp — ${best.airport}→${DESTINATION} [${\n fmtDate(best.dep)\n }]`\n : `✈ Check #${checkNum}: $${best.pp.toLocaleString()}/pp — ${best.airport}→${DESTINATION}`;\n\n const html = buildEmailHtml(combos, checkNum, history.allTimeLow);\n\n await email({ subject, html }); // sends to your Val.town account email automatically\n\n console.log(\n `✅ Check #${checkNum} done. 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Code