116 lines
3.0 KiB
Plaintext
116 lines
3.0 KiB
Plaintext
@page "/import"
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@attribute [Authorize(Roles = AuthRoles.Administrator)]
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@using Core.Parsers
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@using Microsoft.EntityFrameworkCore
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@using WebApp.Authentication
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@inject AppDbContext Context
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@rendermode InteractiveServer
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<PageTitle>Import Data</PageTitle>
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<h1>Import Data</h1>
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<h3>Events</h3>
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<InputFile OnChange="UploadEvents"></InputFile>
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<text>@_events?.Length Events</text>
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<button class="btn btn-primary" @onclick="SaveEvents">Save to Database</button>
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<br/>
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<h3>Students</h3>
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<InputFile OnChange="UploadStudents"></InputFile>
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<text>@_students?.Length Students</text>
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<button class="btn btn-primary" @onclick="SaveStudents">Save to Database</button>
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@code {
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private EventDefinition[]? _events;
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private Student[]? _students;
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async Task UploadEvents(InputFileChangeEventArgs arg)
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{
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await GetStreamReaderFromInputFile(arg, reader =>
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{
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var eventDefinitionParser = new EventDefinitionParser(reader);
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_events = eventDefinitionParser.Parse();
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});
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}
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async Task SaveEvents()
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{
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if (_events == null)
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return;
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foreach (var evt in _events)
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{
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// check if it already exists
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var exists
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= await Context.Events
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.FirstOrDefaultAsync(e => e.Name == evt.Name);
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if (exists != null)
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continue;
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await Context.Events.AddAsync(evt);
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}
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await Context.SaveChangesAsync();
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}
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async Task UploadStudents(InputFileChangeEventArgs arg)
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{
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await GetStreamReaderFromInputFile(arg, reader =>
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{
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var studentParser = new StudentParser(reader);
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_students = studentParser.Parse();
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});
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}
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async Task SaveStudents()
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{
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if (_students == null)
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return;
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try
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{
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foreach (var student in _students)
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{
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// check if it already exists
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var exists
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= await Context.Students
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.FirstOrDefaultAsync(e
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=> e.FirstName == student.FirstName
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&& e.LastName == student.LastName);
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if (exists != null)
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continue;
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await Context.Students.AddAsync(student);
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}
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await Context.SaveChangesAsync();
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}
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catch (Exception e)
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{
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Console.WriteLine(e);
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throw;
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}
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}
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static async Task GetStreamReaderFromInputFile(InputFileChangeEventArgs arg, Action<StreamReader> f)
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{
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StreamReader? streamReader = null;
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try
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{
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var browserFile = arg.File;
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await using var fs = browserFile.OpenReadStream();
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await using var ms = new MemoryStream();
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await fs.CopyToAsync(ms);
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ms.Seek(0,0);
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streamReader = new StreamReader(ms);
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f(streamReader);
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}
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catch
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{
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streamReader?.Dispose();
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throw;
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}
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}
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}
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