Daniel Volz
98 lines
3.0 KiB
TypeScript
98 lines
3.0 KiB
TypeScript
// =============================================================================
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// ICS Calendar Generation
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// =============================================================================
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import type { Medication } from "../types";
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import { getMedDisplayName } from "../types";
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import {
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getIntakeFrequencyText,
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getIntakeScheduleMode,
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getMedicationIntakes,
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getWeekdayIcsCode,
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normalizeWeekdays,
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} from "./intake-schedule";
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/**
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* Format a Date for ICS format (YYYYMMDDTHHMMSSZ)
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*/
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function formatICSDate(date: Date): string {
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return date
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.toISOString()
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.replace(/[-:]/g, "")
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.replace(/\.\d{3}/, "");
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}
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/**
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* Generate and download an ICS calendar file for a medication's schedule
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*/
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export function generateICS(med: Medication): void {
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const displayName = getMedDisplayName(med);
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const events = getMedicationIntakes(med)
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.map((intake, idx) => {
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const start = new Date(intake.start);
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const end = new Date(start.getTime() + 15 * 60 * 1000); // 15 min duration
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const interval = intake.every;
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const pillInfo = `${intake.usage} pill${intake.usage !== 1 ? "s" : ""}${med.pillWeightMg ? ` (${intake.usage * med.pillWeightMg} mg)` : ""}`;
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const summary = `💊 ${displayName} - ${pillInfo}`;
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const weekdayCodes = normalizeWeekdays(intake.weekdays);
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const frequencyText =
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getIntakeScheduleMode(intake) === "weekdays"
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? weekdayCodes.map(getWeekdayIcsCode).join(", ")
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: getIntakeFrequencyText(intake, (key, options) => {
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if (key === "common.daily") return "daily";
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if (key === "common.everyNDays") return `every ${options?.count ?? interval} days`;
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return key;
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});
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const rrule =
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getIntakeScheduleMode(intake) === "weekdays" && weekdayCodes.length > 0
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? `RRULE:FREQ=WEEKLY;BYDAY=${weekdayCodes.map(getWeekdayIcsCode).join(",")}`
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: `RRULE:FREQ=DAILY;INTERVAL=${interval}`;
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const description = [
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`Medication: ${displayName}`,
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med.genericName ? `Generic: ${med.genericName}` : "",
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med.takenBy && med.takenBy.length > 0 ? `For: ${med.takenBy.join(", ")}` : "",
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`Dosage: ${pillInfo}`,
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`Frequency: ${frequencyText}`,
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med.notes ? `Notes: ${med.notes}` : "",
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]
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.filter(Boolean)
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.join("\\n");
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return `BEGIN:VEVENT
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UID:medassist-ng-${med.id}-${idx}@medassist-ng
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DTSTAMP:${formatICSDate(new Date())}
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DTSTART:${formatICSDate(start)}
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DTEND:${formatICSDate(end)}
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${rrule}
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SUMMARY:${summary}
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DESCRIPTION:${description}
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BEGIN:VALARM
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TRIGGER:-PT5M
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ACTION:DISPLAY
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DESCRIPTION:Time to take ${displayName}
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END:VALARM
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END:VEVENT`;
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})
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.join("\n");
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const ics = `BEGIN:VCALENDAR
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VERSION:2.0
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PRODID:-//MedAssist-ng//Medication Schedule//EN
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CALSCALE:GREGORIAN
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METHOD:PUBLISH
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X-WR-CALNAME:${displayName} Schedule
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${events}
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END:VCALENDAR`;
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const blob = new Blob([ics], { type: "text/calendar;charset=utf-8" });
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const url = URL.createObjectURL(blob);
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const link = document.createElement("a");
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link.href = url;
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link.download = `${displayName.replace(/[^a-zA-Z0-9]/g, "_")}_schedule.ics`;
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document.body.appendChild(link);
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link.click();
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document.body.removeChild(link);
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URL.revokeObjectURL(url);
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}
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