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{ blob } from \"https://esm.town/v/std/blob\";\nimport { email } from \"https://esm.town/v/std/email\";\n\n// ============ CONFIG ============\nconst CONFIG = {\n propertyValue: 403000,\n mortgageAmount: 280000,\n termMonths: 324, // 27 years\n};\n\n// ============ TYPES ============\ninterface MortgageProduct {\n initialRate: number;\n productFee: number;\n dealPeriod: number;\n mortgageType: string;\n monthlyRepayment: number;\n productId: string;\n}\n\ninterface NationwideResponse {\n data: {\n searchMortgageProductRates: {\n numberOfMortgages: number;\n standardMortgageRate: number;\n mortgageProducts: MortgageProduct[];\n };\n };\n}\n\ninterface StoredData {\n rates: Record;\n lastChecked: string;\n}\n\ninterface RateChange {\n productId: string;\n dealPeriod: number;\n oldRate: number | null;\n newRate: number;\n oldFee: number | null;\n newFee: number;\n oldMonthly: number | null;\n newMonthly: number;\n changeType: \"new\" | \"rate_changed\" | \"fee_changed\" | \"both_changed\";\n}\n\nconst BLOB_KEY = \"nationwide_mortgage_rates\";\n\n// ============ FUNCTIONS ============\nasync function fetchNationwideRates(): Promise {\n const response = await fetch(\n \"https://graph.nationwide.co.uk/?operationName=getMortgageProducts\",\n {\n method: \"POST\",\n headers: {\n \"content-type\": \"application/json\",\n \"origin\": \"https://www.nationwide.co.uk\",\n },\n body: JSON.stringify({\n operationName: \"getMortgageProducts\",\n variables: {\n BuyerType: \"ec-swi\",\n MortgageTermInMonths: CONFIG.termMonths,\n PropertyValue: CONFIG.propertyValue,\n MortgageAmount: CONFIG.mortgageAmount,\n },\n query:\n `query getMortgageProducts($BuyerType: String!, $MortgageTermInMonths: Int!, $PropertyValue: Int!, $Deposit: Int, $MortgageAmount: Float, $AdditionalBorrowingAmount: Float, $HasHelpToBuySharedEquityLoan: Boolean, $HasSaveToBuyOrHelpToBuyISA: Boolean, $IsBorrowingOnBehalfOfFamily: Boolean, $IsGreenMortgageProduct: Boolean) {\n searchMortgageProductRates(\n BuyerType: $BuyerType\n MortgageTermInMonths: $MortgageTermInMonths\n PropertyValue: $PropertyValue\n Deposit: $Deposit\n MortgageAmount: $MortgageAmount\n AdditionalBorrowingAmount: $AdditionalBorrowingAmount\n HasHelpToBuySharedEquityLoan: $HasHelpToBuySharedEquityLoan\n HasSaveToBuyOrHelpToBuyISA: $HasSaveToBuyOrHelpToBuyISA\n IsBorrowingOnBehalfOfFamily: $IsBorrowingOnBehalfOfFamily\n IsGreenMortgageProduct: $IsGreenMortgageProduct\n ) {\n numberOfMortgages\n standardMortgageRate\n mortgageProducts {\n initialRate\n productFee\n dealPeriod\n mortgageType\n productId\n monthlyRepayment\n }\n }\n }`,\n }),\n },\n );\n\n const data: NationwideResponse = await response.json();\n return data.data.searchMortgageProductRates.mortgageProducts.filter((p) =>\n p.dealPeriod < 5 && p.productFee > 0\n );\n}\n\nasync function getStoredData(): Promise {\n try {\n return await blob.getJSON(BLOB_KEY);\n } catch {\n return null;\n }\n}\n\nasync function storeData(products: MortgageProduct[]): Promise {\n const rates: Record = {};\n for (const p of products) {\n rates[p.productId] = p;\n }\n await blob.setJSON(BLOB_KEY, {\n rates,\n lastChecked: new Date().toISOString(),\n });\n}\n\nfunction detectChanges(\n current: MortgageProduct[],\n stored: StoredData | null,\n): RateChange[] {\n const changes: RateChange[] = [];\n const previousRates = stored?.rates ?? {};\n\n for (const product of current) {\n const previous = previousRates[product.productId];\n\n if (!previous) {\n changes.push({\n productId: product.productId,\n dealPeriod: product.dealPeriod,\n oldRate: null,\n newRate: product.initialRate,\n oldFee: null,\n newFee: product.productFee,\n oldMonthly: null,\n newMonthly: product.monthlyRepayment,\n changeType: \"new\",\n });\n } else {\n const rateChanged = previous.initialRate !== product.initialRate;\n const feeChanged = previous.productFee !== product.productFee;\n\n if (rateChanged || feeChanged) {\n changes.push({\n productId: product.productId,\n dealPeriod: product.dealPeriod,\n oldRate: previous.initialRate,\n newRate: product.initialRate,\n oldFee: previous.productFee,\n newFee: product.productFee,\n oldMonthly: previous.monthlyRepayment,\n newMonthly: product.monthlyRepayment,\n changeType: rateChanged && feeChanged\n ? \"both_changed\"\n : rateChanged\n ? \"rate_changed\"\n : \"fee_changed\",\n });\n }\n }\n }\n\n return changes;\n}\n\nfunction formatChangesEmail(changes: RateChange[]): string {\n const lines = [\"Nationwide 2-Year Fixed Rate Changes:\\n\"];\n\n for (const c of changes) {\n lines.push(`📦 ${c.dealPeriod} year fixed`);\n\n if (c.changeType === \"new\") {\n lines.push(\n ` NEW: ${c.newRate}% rate, £${c.newFee} fee, £${c.newMonthly}/month`,\n );\n } else {\n if (c.oldRate !== c.newRate) {\n const direction = c.newRate < c.oldRate! ? \"⬇️\" : \"⬆️\";\n lines.push(` Rate: ${c.oldRate}% → ${c.newRate}% ${direction}`);\n }\n if (c.oldFee !== c.newFee) {\n lines.push(` Fee: £${c.oldFee} → £${c.newFee}`);\n }\n if (c.oldMonthly !== c.newMonthly) {\n lines.push(` Monthly: £${c.oldMonthly} → £${c.newMonthly}`);\n }\n }\n lines.push(\"\");\n }\n\n return lines.join(\"\\n\");\n}\n\n// ============ CRON HANDLER ============\nexport default async function handler() {\n const products = await fetchNationwideRates();\n const stored = await getStoredData();\n const changes = detectChanges(products, stored);\n\n await storeData(products);\n\n console.log(\"Prev:\", stored);\n console.log(\"Updated:\", products);\n console.log(\"Changes:\", changes);\n console.log(\"Sending email:\", changes.length > 0);\n\n if (changes.length > 0) {\n await email({\n subject: `🏠 Nationwide Rate Change (${changes.length} update${\n changes.length > 1 ? \"s\" : \"\"\n })`,\n text: formatChangesEmail(changes),\n });\n console.log(\"Email sent!\");\n }\n\n return {\n checked: new Date().toISOString(),\n productsFound: products.length,\n changesDetected: changes.length,\n changes,\n };\n}","import { blob } from \"https://esm.town/v/std/blob\";\nimport { email } from \"https://esm.town/v/std/email\";\n\n// ============ CONFIG ============\nconst CONFIG = {\n propertyValue: 403000,\n mortgageAmount: 280000,\n termMonths: 324, // 27 years\n};\n\n// ============ TYPES ============\ninterface MortgageProduct {\n initialRate: number;\n productFee: number;\n dealPeriod: number;\n mortgageType: string;\n monthlyRepayment: number;\n productId: string;\n}\n\ninterface NationwideResponse {\n data: {\n searchMortgageProductRates: {\n numberOfMortgages: number;\n standardMortgageRate: number;\n mortgageProducts: MortgageProduct[];\n };\n };\n}\n\ninterface StoredData {\n rates: Record;\n lastChecked: string;\n}\n\ninterface RateChange {\n productId: string;\n dealPeriod: number;\n oldRate: number | null;\n newRate: number;\n oldFee: number | null;\n newFee: number;\n oldMonthly: number | null;\n newMonthly: number;\n changeType: \"new\" | \"rate_changed\" | \"fee_changed\" | \"both_changed\";\n}\n\nconst BLOB_KEY = \"nationwide_mortgage_rates\";\n\n// ============ FUNCTIONS ============\nasync function fetchNationwideRates(): Promise {\n const response = await fetch(\n \"https://graph.nationwide.co.uk/?operationName=getMortgageProducts\",\n {\n method: \"POST\",\n headers: {\n \"content-type\": \"application/json\",\n \"origin\": \"https://www.nationwide.co.uk\",\n },\n body: JSON.stringify({\n operationName: \"getMortgageProducts\",\n variables: {\n BuyerType: \"ec-swi\",\n MortgageTermInMonths: CONFIG.termMonths,\n PropertyValue: CONFIG.propertyValue,\n MortgageAmount: CONFIG.mortgageAmount,\n },\n query:\n `query getMortgageProducts($BuyerType: String!, $MortgageTermInMonths: Int!, $PropertyValue: Int!, $Deposit: Int, $MortgageAmount: Float, $AdditionalBorrowingAmount: Float, $HasHelpToBuySharedEquityLoan: Boolean, $HasSaveToBuyOrHelpToBuyISA: Boolean, $IsBorrowingOnBehalfOfFamily: Boolean, $IsGreenMortgageProduct: Boolean) {\n searchMortgageProductRates(\n BuyerType: $BuyerType\n MortgageTermInMonths: $MortgageTermInMonths\n PropertyValue: $PropertyValue\n Deposit: $Deposit\n MortgageAmount: $MortgageAmount\n AdditionalBorrowingAmount: $AdditionalBorrowingAmount\n HasHelpToBuySharedEquityLoan: $HasHelpToBuySharedEquityLoan\n HasSaveToBuyOrHelpToBuyISA: $HasSaveToBuyOrHelpToBuyISA\n IsBorrowingOnBehalfOfFamily: $IsBorrowingOnBehalfOfFamily\n IsGreenMortgageProduct: $IsGreenMortgageProduct\n ) {\n numberOfMortgages\n standardMortgageRate\n mortgageProducts {\n initialRate\n productFee\n dealPeriod\n mortgageType\n productId\n monthlyRepayment\n }\n }\n }`,\n }),\n },\n );\n\n const data: NationwideResponse = await response.json();\n return data.data.searchMortgageProductRates.mortgageProducts.filter((p) =>\n p.dealPeriod < 5\n );\n}\n\nasync function getStoredData(): Promise {\n try {\n return await blob.getJSON(BLOB_KEY);\n } catch {\n return null;\n }\n}\n\nasync function storeData(products: MortgageProduct[]): Promise {\n const rates: Record = {};\n for (const p of products) {\n rates[p.productId] = p;\n }\n await blob.setJSON(BLOB_KEY, {\n rates,\n lastChecked: new Date().toISOString(),\n });\n}\n\nfunction detectChanges(\n current: MortgageProduct[],\n stored: StoredData | null,\n): RateChange[] {\n const changes: RateChange[] = [];\n const previousRates = stored?.rates ?? {};\n\n for (const product of current) {\n const previous = previousRates[product.productId];\n\n if (!previous) {\n changes.push({\n productId: product.productId,\n dealPeriod: product.dealPeriod,\n oldRate: null,\n newRate: product.initialRate,\n oldFee: null,\n newFee: product.productFee,\n oldMonthly: null,\n newMonthly: product.monthlyRepayment,\n changeType: \"new\",\n });\n } else {\n const rateChanged = previous.initialRate !== product.initialRate;\n const feeChanged = previous.productFee !== product.productFee;\n\n if (rateChanged || feeChanged) {\n changes.push({\n productId: product.productId,\n dealPeriod: product.dealPeriod,\n oldRate: previous.initialRate,\n newRate: product.initialRate,\n oldFee: previous.productFee,\n newFee: product.productFee,\n oldMonthly: previous.monthlyRepayment,\n newMonthly: product.monthlyRepayment,\n changeType: rateChanged && feeChanged\n ? \"both_changed\"\n : rateChanged\n ? \"rate_changed\"\n : \"fee_changed\",\n });\n }\n }\n }\n\n return changes;\n}\n\nfunction formatChangesEmail(changes: RateChange[]): string {\n const lines = [\"Nationwide 2-Year Fixed Rate Changes:\\n\"];\n\n for (const c of changes) {\n lines.push(`📦 ${c.dealPeriod} year fixed`);\n\n if (c.changeType === \"new\") {\n lines.push(\n ` NEW: ${c.newRate}% rate, £${c.newFee} fee, £${c.newMonthly}/month`,\n );\n } else {\n if (c.oldRate !== c.newRate) {\n const direction = c.newRate < c.oldRate! ? \"⬇️\" : \"⬆️\";\n lines.push(` Rate: ${c.oldRate}% → ${c.newRate}% ${direction}`);\n }\n if (c.oldFee !== c.newFee) {\n lines.push(` Fee: £${c.oldFee} → £${c.newFee}`);\n }\n if (c.oldMonthly !== c.newMonthly) {\n lines.push(` Monthly: £${c.oldMonthly} → £${c.newMonthly}`);\n }\n }\n lines.push(\"\");\n }\n\n return lines.join(\"\\n\");\n}\n\n// ============ CRON HANDLER ============\nexport default async function handler() {\n const products = await fetchNationwideRates();\n const stored = await getStoredData();\n const changes = detectChanges(products, stored);\n\n await storeData(products);\n\n console.log(\"Prev:\", stored);\n console.log(\"Updated:\", products);\n console.log(\"Changes:\", changes);\n console.log(\"Sending email:\", changes.length > 0);\n\n if (changes.length > 0) {\n await email({\n subject: `🏠 Nationwide Rate Change (${changes.length} update${\n changes.length > 1 ? \"s\" : \"\"\n })`,\n text: formatChangesEmail(changes),\n });\n console.log(\"Email sent!\");\n }\n\n return {\n checked: new Date().toISOString(),\n productsFound: products.length,\n changesDetected: changes.length,\n changes,\n 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Diff · v21