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import { Command, type Update } from 'foldkit'
import { modifyFields } from 'foldkit/struct'
import { parseCoordinate } from '../../core/systems/registry'
import { Message, OutMessage } from './message'
import { type Model, Status } from './model'
type UpdateReturn = Update.ReturnWithOutMessage<Model, Message, OutMessage>
const searchFailureReason = (query: string): string =>
String.isEmpty(query)
? 'Enter a coordinate'
: `Could not recognise "${query}"`
const submitSearch = (model: Model): UpdateReturn => {
const query = model.query.trim()
return Option.match(parseCoordinate(query), {
onNone: () => ({
model: modifyFields(model, {
status: () =>
Status.SearchFailed({ reason: searchFailureReason(query) }),
}),
}),
onSome: ({ kind, point, maybeBounds, maybeCaution }) => ({
model: modifyFields(model, {
status: () => Status.Found({ kind, maybeCaution }),
}),
outMessage: OutMessage.ChoseLocation({ point, maybeBox: maybeBounds }),
}),
})
}
/** A location result counts only for the request in flight; typing, a search or a newer request cancels it. */
const whenAnswering = (
model: Model,
requestId: number,
toResult: () => UpdateReturn,
): UpdateReturn => {
const isCurrentRequest =
Status.guards.Locating(model.status) && model.status.requestId === requestId
if (isCurrentRequest) {
return toResult()
} else {
return { model }
}
}
const startLocating = (model: Model): UpdateReturn => {
const requestId = model.locateRequestCount + 1
return {
model: modifyFields(model, {
status: () => Status.Locating({ requestId }),
locateRequestCount: () => requestId,
}),
commands: [GetCurrentPosition({ requestId })],
}
}
// UPDATE
export const update = (model: Model, message: Message) =>
Message.match<UpdateReturn>(message, {
UpdatedQuery: ({ value }) => ({
model: modifyFields(model, {
query: () => value,
status: () => Status.Idle(),
}),
}),
SubmittedSearch: () => submitSearch(model),
ClickedFindMyLocation: () =>
Status.guards.Locating(model.status) ? { model } : startLocating(model),
SucceededGetCurrentPosition: ({ requestId, point }) =>
whenAnswering(model, requestId, () => ({
model: modifyFields(model, { status: () => Status.Idle() }),
outMessage: OutMessage.ChoseLocation({
point,
maybeBox: Option.none(),
}),
})),
FailedGetCurrentPosition: ({ requestId, reason }) =>
whenAnswering(model, requestId, () => ({
model: modifyFields(model, {
status: () => Status.LocateFailed({ reason }),
}),
})),
})
/** The cue moved some other way (a map click, or clearing it), so the last status no longer applies. */
export const clearStatus = (model: Model): Update.Return<Model, Message> => ({
model: modifyFields(model, { status: () => Status.Idle() }),
})
// COMMAND
class GeolocationError extends Data.TaggedError('GeolocationError')<{
readonly reason: string
}> {}
const LOCATION_TIMEOUT = Duration.seconds(10)
const LOCATION_MAX_AGE = Duration.seconds(30)
const locationErrorText = (error: GeolocationPositionError): string => {
if (error.code === error.PERMISSION_DENIED) {
return 'Location permission denied.'
}
if (error.code === error.TIMEOUT) {
return 'Location timed out.'
}
return 'Location unavailable.'
}
/** Ask the browser for the device position. The browser asks the user for permission the first time. */
export const GetCurrentPosition = Command.define('GetCurrentPosition', {
args: { requestId: Schema.Int },
messages: [
Message.SucceededGetCurrentPosition,
Message.FailedGetCurrentPosition,
],
execute: ({ requestId }) =>
Effect.callback<GeolocationPosition, GeolocationError>(resume => {
if (typeof navigator === 'undefined' || !navigator.geolocation) {
resume(
Effect.fail(
new GeolocationError({
reason: 'This browser cannot share its location.',
}),
),
)
return
}
navigator.geolocation.getCurrentPosition(
position => resume(Effect.succeed(position)),
error =>
resume(
Effect.fail(
new GeolocationError({ reason: locationErrorText(error) }),
),
),
{
enableHighAccuracy: true,
timeout: Duration.toMillis(LOCATION_TIMEOUT),
maximumAge: Duration.toMillis(LOCATION_MAX_AGE),
},
)
}).pipe(
Effect.map(position =>
Message.SucceededGetCurrentPosition({
requestId,
point: {
lat: position.coords.latitude,
lon: position.coords.longitude,
},
}),
),
Effect.catch(error =>
Effect.succeed(
Message.FailedGetCurrentPosition({
requestId,
reason: error.reason,
}),
),
),
),
})
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