Created
September 19, 2019 13:37
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import { useState, useEffect } from "react"; | |
import { Auth, API, graphqlOperation } from "aws-amplify"; | |
import parse from "date-fns/parse"; | |
import format from "date-fns/format"; | |
import formatDistance from "date-fns/formatDistance"; | |
import { getEvent } from "../graphql/queries"; | |
import { | |
onUpdateEvent, | |
onUpdateTask, | |
onCreateTask, | |
onDeleteTask | |
} from "../graphql/subscriptions"; | |
export default eventId => { | |
const [event, setEvent] = useState(null); | |
const [user, setUser] = useState(null); | |
useEffect(() => { | |
Auth.currentAuthenticatedUser() | |
.then(user => setUser(user)) | |
.catch(error => console.log(error)); | |
}, [setUser]); | |
useEffect(() => { | |
const getDisplayDates = (startDate, endDate) => { | |
const start = parse(startDate, "yyyy-MM-dd", new Date()); | |
const end = parse(endDate, "yyyy-MM-dd", new Date()); | |
if (startDate === endDate) { | |
return format(start, "MMM do"); | |
} | |
return `${format(start, "MMM do")} / ${format(end, "MMM do")}`; | |
}; | |
const getTimeToEvent = startDate => { | |
const start = parse(startDate, "yyyy-MM-dd", new Date()); | |
return formatDistance(new Date(), start); | |
}; | |
API.graphql( | |
graphqlOperation(getEvent, { | |
id: eventId | |
}) | |
) | |
.then(result => { | |
const event = result.data.getEvent; | |
const sortedTasks = event.tasks.items.sort((a, b) => { | |
if (a.due > b.due) return 1; | |
if (a.due < b.due) return -1; | |
return 0; | |
}); | |
event.tasks = { ...event.tasks, items: sortedTasks }; | |
setEvent({ | |
...event, | |
displayDates: getDisplayDates(event.dates.start, event.dates.end), | |
timeToEvent: getTimeToEvent(event.dates.start) | |
}); | |
}) | |
.catch(error => console.log(error)); | |
}, [setEvent]); | |
useEffect(() => { | |
if (!user || !event) return; | |
const subscription = API.graphql( | |
graphqlOperation(onUpdateEvent, { | |
owner: user.username | |
}) | |
).subscribe({ | |
next: ({ | |
value: { | |
data: { onUpdateEvent: updatedEvent } | |
} | |
}) => { | |
if (updatedEvent.id === event.id) { | |
setEvent({ | |
...event, | |
...updatedEvent | |
}); | |
} | |
} | |
}); | |
return () => subscription.unsubscribe(); | |
}, [user, setUser, event, setEvent]); | |
useEffect(() => { | |
if (!user || !event) return; | |
const subscription = API.graphql( | |
graphqlOperation(onUpdateTask, { | |
owner: user.username | |
}) | |
).subscribe({ | |
next: ({ | |
value: { | |
data: { onUpdateTask: updatedTask } | |
} | |
}) => { | |
if (updatedTask.event.id === event.id) { | |
const updatedTasks = event.tasks.items.map(task => { | |
if (task.id === updatedTask.id) { | |
return { | |
id: updatedTask.id, | |
title: updatedTask.title, | |
due: updatedTask.due, | |
completed: updatedTask.completed | |
}; | |
} | |
return task; | |
}); | |
setEvent({ | |
...event, | |
tasks: { items: updatedTasks } | |
}); | |
} | |
} | |
}); | |
return () => subscription.unsubscribe(); | |
}, [user, setUser, event, setEvent]); | |
useEffect(() => { | |
if (!user || !event) return; | |
const subscription = API.graphql( | |
graphqlOperation(onCreateTask, { | |
owner: user.username | |
}) | |
).subscribe({ | |
next: ({ | |
value: { | |
data: { onCreateTask: createdTask } | |
} | |
}) => { | |
if (createdTask.event.id === event.id) { | |
const sortedTasks = [...event.tasks.items, createdTask].sort( | |
(a, b) => { | |
if (a.due > b.due) return 1; | |
if (a.due < b.due) return -1; | |
return 0; | |
} | |
); | |
setEvent({ | |
...event, | |
tasks: { items: sortedTasks } | |
}); | |
} | |
} | |
}); | |
return () => subscription.unsubscribe(); | |
}, [user, setUser, event, setEvent]); | |
useEffect(() => { | |
if (!user || !event) return; | |
const subscription = API.graphql( | |
graphqlOperation(onDeleteTask, { | |
owner: user.username | |
}) | |
).subscribe({ | |
next: ({ | |
value: { | |
data: { onDeleteTask: deletedTask } | |
} | |
}) => { | |
if (deletedTask.event.id === event.id) { | |
const updatedTasks = event.tasks.items.filter( | |
task => task.id !== deletedTask.id | |
); | |
setEvent({ | |
...event, | |
tasks: { items: updatedTasks } | |
}); | |
} | |
} | |
}); | |
return () => subscription.unsubscribe(); | |
}, [user, setUser, event, setEvent]); | |
return [event]; | |
}; |
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