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Two numbers per boundary so readings sitting on a line\n// don't ping-pong: you drop INTO a better band at the lower number,\n// but have to climb past the higher number to fall back out of it.\nconst GOOD_ENTER = 65; // below this = good\nconst GOOD_EXIT = 70; // must exceed this to stop being \"good\"\nconst OK_ENTER = 90; // below this = borderline-acceptable\nconst OK_EXIT = 95; // must exceed this to become \"too high\"\n\n// Alert window, in Kuala Lumpur time. 7.5 = 7:30am, 17 = 5:00pm.\nconst WINDOW_START = 7.5;\nconst WINDOW_END = 17;\n\nconst STATE_KEY = \"khaleesi_aqi_state\";\n\n// ─── Nothing below here normally needs editing ────────────────────────\n\ntype Band = \"GOOD\" | \"OK\" | \"BAD\";\n\ninterface State {\n band: Band;\n lastObservation: string; // timestamp of the last reading we acted on\n lastBriefDate: string; // KL date we last sent a morning brief\n}\n\n/** Current time in Kuala Lumpur, regardless of where the server is. */\nfunction klNow(): { date: string; hours: number } {\n const parts = new Intl.DateTimeFormat(\"en-GB\", {\n timeZone: \"Asia/Kuala_Lumpur\",\n year: \"numeric\",\n month: \"2-digit\",\n day: \"2-digit\",\n hour: \"2-digit\",\n minute: \"2-digit\",\n hour12: false,\n }).formatToParts(new Date());\n\n const get = (type: string) => parts.find((p) => p.type === type)!.value;\n\n return {\n date: `${get(\"year\")}-${get(\"month\")}-${get(\"day\")}`,\n hours: Number(get(\"hour\")) + Number(get(\"minute\")) / 60,\n };\n}\n\n/** Which band a reading falls into, given where we were before. */\nfunction nextBand(value: number, previous: Band): Band {\n if (previous === \"GOOD\") {\n if (value >= OK_EXIT) return \"BAD\";\n if (value > GOOD_EXIT) return \"OK\";\n return \"GOOD\";\n }\n if (previous === \"OK\") {\n if (value < GOOD_ENTER) return \"GOOD\";\n if (value >= OK_EXIT) return \"BAD\";\n return \"OK\";\n }\n // previous === \"BAD\"\n if (value < GOOD_ENTER) return \"GOOD\";\n if (value < OK_ENTER) return \"OK\";\n return \"BAD\";\n}\n\nconst BAND_INFO: Record = {\n GOOD: { emoji: \"🟢\", verdict: \"Good — she can go out.\" },\n OK: { emoji: \"🟡\", verdict: \"Borderline. Short trip only.\" },\n BAD: { emoji: \"🔴\", verdict: \"Too high — keep her in.\" },\n};\n\nasync function notify(title: string, body: string) {\n const user = Deno.env.get(\"PUSHOVER_USER\");\n const token = Deno.env.get(\"PUSHOVER_TOKEN\");\n if (!user || !token) throw new Error(\"Pushover credentials are not set\");\n\n const response = await fetch(\"https://api.pushover.net/1/messages.json\", {\n method: \"POST\",\n headers: { \"Content-Type\": \"application/json\" },\n body: JSON.stringify({\n token,\n user,\n title,\n message: body,\n priority: 0, // raise to 1 if you want these to bypass your quiet hours\n }),\n });\n\n if (!response.ok) {\n console.error(\n \"Pushover rejected the message:\",\n response.status,\n await response.text(),\n );\n }\n}\n\nexport default async function () {\n const waqiToken = Deno.env.get(\"WAQI_TOKEN\");\n if (!waqiToken) throw new Error(\"WAQI_TOKEN environment variable is not set\");\n\n // 1. Fetch the current reading.\n const response = await fetch(\n `https://api.waqi.info/feed/${STATION}/?token=${waqiToken}`,\n );\n const payload = await response.json();\n\n if (payload.status !== \"ok\") {\n console.error(\"WAQI returned an error:\", payload);\n return; // stay quiet; try again in 15 minutes\n }\n\n const pm25 = payload.data?.iaqi?.pm25?.v;\n const observedAt = payload.data?.time?.iso;\n\n if (typeof pm25 !== \"number\" || !observedAt) {\n console.error(\"No PM2.5 value in the response:\", payload.data);\n return;\n }\n\n // 2. Load what we knew last time.\n const previous = (await blob.getJSON(STATE_KEY)) as State | undefined;\n const previousBand: Band = previous?.band ?? \"BAD\"; // pessimistic default\n\n // 3. Skip if the sensor hasn't reported anything new.\n if (previous && previous.lastObservation === observedAt) {\n console.log(`No new reading since ${observedAt}. Nothing to do.`);\n return;\n }\n\n const band = nextBand(pm25, previousBand);\n const { date, hours } = klNow();\n const inWindow = hours >= WINDOW_START && hours < WINDOW_END;\n\n const save = (lastBriefDate: string) =>\n blob.setJSON(\n STATE_KEY,\n {\n band,\n lastObservation: observedAt,\n lastBriefDate,\n } satisfies State,\n );\n\n // 4. Outside the alert window: track the change silently.\n // The morning brief will cover anything that happened overnight.\n if (!inWindow) {\n console.log(\n `Outside window (${hours.toFixed(2)}h KL). PM2.5 ${pm25}, band ${band}.`,\n );\n await save(previous?.lastBriefDate ?? \"\");\n return;\n }\n\n const info = BAND_INFO[band];\n const isFirstOfDay = previous?.lastBriefDate !== date;\n\n if (isFirstOfDay) {\n // 5a. Morning brief — always sent, so you start the day knowing\n // where things stand even if the crossing happened at 6am.\n await notify(\n `Morning: PM2.5 ${pm25}`,\n `${info.emoji} PM2.5 is ${pm25}. ${info.verdict}`,\n );\n await save(date);\n return;\n }\n\n if (band !== previousBand) {\n // 5b. The band changed during the day — this is the alert you're here for.\n const improving = band === \"GOOD\" ||\n (band === \"OK\" && previousBand === \"BAD\");\n\n await notify(\n `PM2.5 now ${pm25}`,\n `${info.emoji} ${\n improving ? \"Improving\" : \"Worsening\"\n }: PM2.5 is ${pm25}. ${info.verdict}`,\n );\n } else {\n console.log(`PM2.5 ${pm25}, still ${band}. 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Two numbers per boundary so readings sitting on a line\n// don't ping-pong: you drop INTO a better band at the lower number,\n// but have to climb past the higher number to fall back out of it.\nconst GOOD_ENTER = 65; // below this = good\nconst GOOD_EXIT = 70; // must exceed this to stop being \"good\"\nconst OK_ENTER = 90; // below this = borderline-acceptable\nconst OK_EXIT = 95; // must exceed this to become \"too high\"\n\n// Alert window, in Kuala Lumpur time. 7.5 = 7:30am, 17 = 5:00pm.\nconst WINDOW_START = 7.5;\nconst WINDOW_END = 17;\n\nconst STATE_KEY = \"khaleesi_aqi_state\";\n\n// ─── Nothing below here normally needs editing ────────────────────────\n\ntype Band = \"GOOD\" | \"OK\" | \"BAD\";\n\ninterface State {\n band: Band;\n lastObservation: string; // timestamp of the last reading we acted on\n lastBriefDate: string; // KL date we last sent a morning brief\n}\n\n/** Current time in Kuala Lumpur, regardless of where the server is. */\nfunction klNow(): { date: string; hours: number } {\n const parts = new Intl.DateTimeFormat(\"en-GB\", {\n timeZone: \"Asia/Kuala_Lumpur\",\n year: \"numeric\",\n month: \"2-digit\",\n day: \"2-digit\",\n hour: \"2-digit\",\n minute: \"2-digit\",\n hour12: false,\n }).formatToParts(new Date());\n\n const get = (type: string) => parts.find((p) => p.type === type)!.value;\n\n return {\n date: `${get(\"year\")}-${get(\"month\")}-${get(\"day\")}`,\n hours: Number(get(\"hour\")) + Number(get(\"minute\")) / 60,\n };\n}\n\n/** Which band a reading falls into, given where we were before. */\nfunction nextBand(value: number, previous: Band): Band {\n if (previous === \"GOOD\") {\n if (value >= OK_EXIT) return \"BAD\";\n if (value > GOOD_EXIT) return \"OK\";\n return \"GOOD\";\n }\n if (previous === \"OK\") {\n if (value < GOOD_ENTER) return \"GOOD\";\n if (value >= OK_EXIT) return \"BAD\";\n return \"OK\";\n }\n // previous === \"BAD\"\n if (value < GOOD_ENTER) return \"GOOD\";\n if (value < OK_ENTER) return \"OK\";\n return \"BAD\";\n}\n\nconst BAND_INFO: Record = {\n GOOD: { emoji: \"🟢\", verdict: \"Good — she can go out.\" },\n OK: { emoji: \"🟡\", verdict: \"Borderline. Short trip only.\" },\n BAD: { emoji: \"🔴\", verdict: \"Too high — keep her in.\" },\n};\n\nasync function notify(title: string, body: string) {\n const user = Deno.env.get(\"PUSHOVER_USER\");\n const token = Deno.env.get(\"PUSHOVER_TOKEN\");\n if (!user || !token) throw new Error(\"Pushover credentials are not set\");\n\n const response = await fetch(\"https://api.pushover.net/1/messages.json\", {\n method: \"POST\",\n headers: { \"Content-Type\": \"application/json\" },\n body: JSON.stringify({\n token,\n user,\n title,\n message: body,\n priority: 0, // raise to 1 if you want these to bypass your quiet hours\n }),\n });\n\n if (!response.ok) {\n console.error(\n \"Pushover rejected the message:\",\n response.status,\n await response.text(),\n );\n }\n}\n\nexport default async function () {\n const t = Deno.env.get(\"WAQI_TOKEN\");\nconsole.log(`length: ${t?.length}, starts: \"${t?.slice(0, 4)}\", ends: \"${t?.slice(-4)}\"`);\n \n // 1. Fetch the current reading.\n const response = await fetch(\n `https://api.waqi.info/feed/${STATION}/?token=${waqiToken}`,\n );\n const payload = await response.json();\n\n if (payload.status !== \"ok\") {\n console.error(\"WAQI returned an error:\", payload);\n return; // stay quiet; try again in 15 minutes\n }\n\n const pm25 = payload.data?.iaqi?.pm25?.v;\n const observedAt = payload.data?.time?.iso;\n\n if (typeof pm25 !== \"number\" || !observedAt) {\n console.error(\"No PM2.5 value in the response:\", payload.data);\n return;\n }\n\n // 2. Load what we knew last time.\n const previous = (await blob.getJSON(STATE_KEY)) as State | undefined;\n const previousBand: Band = previous?.band ?? \"BAD\"; // pessimistic default\n\n // 3. Skip if the sensor hasn't reported anything new.\n if (previous && previous.lastObservation === observedAt) {\n console.log(`No new reading since ${observedAt}. 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Diff · v10