@page "/calendar/event-occurrences/import"
@attribute [Authorize]
@using Core.Entities
@using Core.Models
@using Core.Services
@using Microsoft.EntityFrameworkCore
@using WebApp.Components.Shared.Components
@using MudBlazor
@inject IEventOccurrenceParserService ParserService
@inject AppDbContext Context
@inject NavigationManager NavigationManager
@inject ISnackbar Snackbar

<PageHeader 
    Title="Import Event Occurrences" 
    Description="Parse and import event occurrence data from text"
    ShowBackButton="true"
    BackButtonUrl="/calendar/event-occurrences" />

<MudGrid>
    <MudItem xs="12" md="6">
        <MudPaper Elevation="2" Class="pa-3 pa-md-6">
            <MudText Typo="Typo.h5" Class="mb-4">Paste Event Occurrence Data</MudText>
            <MudStack Spacing="3">
                <MudTextField 
                    T="string" 
                    Label="Event Occurrence Text" 
                    @bind-Value="_inputText" 
                    Variant="Variant.Outlined"
                    Lines="15"
                    MultiLine="true"
                    Placeholder="Paste event occurrence text here..."
                    HelperText="Paste the event schedule text in the format expected by the parser" />
                
                <MudStack Row="true" Spacing="2">
                    <MudButton 
                        Variant="Variant.Filled" 
                        Color="Color.Primary"
                        StartIcon="@Icons.Material.Filled.Article"
                        OnClick="HandleParse"
                        Disabled="@_isParsing">
                        Parse
                    </MudButton>
                    <MudButton 
                        Variant="Variant.Text" 
                        OnClick="HandleClear"
                        Disabled="@_isParsing">
                        Clear
                    </MudButton>
                </MudStack>
            </MudStack>
        </MudPaper>
    </MudItem>

    <MudItem xs="12" md="6">
        <MudPaper Elevation="2" Class="pa-3 pa-md-6">
            <MudText Typo="Typo.h5" Class="mb-4">Parsed Results</MudText>
            
            @if (_isParsing)
            {
                <MudProgressLinear Indeterminate="true" Class="mb-4" />
                <MudText>Parsing...</MudText>
            }
            else if (_parseResult == null)
            {
                <MudText Class="mud-text-secondary">Parse text to see results here</MudText>
            }
            else
            {
                <MudStack Spacing="3">
                    @* Errors *@
                    @if (_parseResult.Errors.Any())
                    {
                        @foreach (var error in _parseResult.Errors)
                        {
                            <MudAlert Severity="Severity.Error" Dense="true">@error</MudAlert>
                        }
                    }

                    @* Warnings *@
                    @if (_parseResult.Warnings.Any())
                    {
                        @foreach (var warning in _parseResult.Warnings)
                        {
                            <MudAlert Severity="Severity.Warning" Dense="true">@warning</MudAlert>
                        }
                    }

                    @* Summary *@
                    @if (_parseResult.IsSuccess && _parseResult.TotalParsed > 0)
                    {
                        <MudAlert Severity="Severity.Success" Dense="true">
                            Successfully parsed @_parseResult.TotalParsed occurrence(s) from @_parseResult.Occurrences.Count event definition(s)
                        </MudAlert>
                    }

                    @* Parsed Occurrences List *@
                    @if (_parseResult.IsSuccess && _parseResult.Occurrences.Any())
                    {
                        <MudText Typo="Typo.h6" Class="mt-4 mb-2">Occurrences by Event:</MudText>
                        <MudExpansionPanels Elevation="0">
                            @foreach (var kvp in _parseResult.Occurrences.OrderBy(x => GetEventName(x.Key)))
                            {
                                <MudExpansionPanel Text="@GetEventName(kvp.Key)">
                                    <MudTable Items="@kvp.Value" Dense="true" Hover="true" Striped="true">
                                        <HeaderContent>
                                            <MudTh>Name</MudTh>
                                            <MudTh>Date</MudTh>
                                            <MudTh>Time</MudTh>
                                            <MudTh>Location</MudTh>
                                        </HeaderContent>
                                        <RowTemplate>
                                            <MudTd DataLabel="Name">@context.Name</MudTd>
                                            <MudTd DataLabel="Date">@context.Date</MudTd>
                                            <MudTd DataLabel="Time">@context.Time</MudTd>
                                            <MudTd DataLabel="Location">@(context.Location ?? "-")</MudTd>
                                        </RowTemplate>
                                    </MudTable>
                                </MudExpansionPanel>
                            }
                        </MudExpansionPanels>

                        <MudStack Row="true" Spacing="2" Class="mt-4">
                            <MudButton 
                                Variant="Variant.Filled" 
                                Color="Color.Success"
                                StartIcon="@Icons.Material.Filled.Save"
                                OnClick="HandleSaveToDatabase"
                                Disabled="@_isSaving">
                                Save to Database
                            </MudButton>
                            <MudButton 
                                Variant="Variant.Text" 
                                OnClick="HandleClearResults">
                                Clear Results
                            </MudButton>
                        </MudStack>
                    }
                    else if (_parseResult.IsSuccess && _parseResult.TotalParsed == 0)
                    {
                        <MudAlert Severity="Severity.Info" Dense="true">
                            No occurrences were parsed from the text. Please check the format.
                        </MudAlert>
                    }
                </MudStack>
            }
        </MudPaper>
    </MudItem>
</MudGrid>

@code {
    private string _inputText = string.Empty;
    private EventOccurrenceParseResult? _parseResult;
    private bool _isParsing = false;
    private bool _isSaving = false;

    private async Task HandleParse()
    {
        if (string.IsNullOrWhiteSpace(_inputText))
        {
            Snackbar.Add("Please enter text to parse", Severity.Warning);
            return;
        }

        _isParsing = true;
        try
        {
            // Get EventDefinitions from database
            var events = await Context.Events.ToListAsync();
            
            // Parse the text
            _parseResult = ParserService.ParseFromText(_inputText, events);
        }
        catch (Exception ex)
        {
            Snackbar.Add($"Error parsing text: {ex.Message}", Severity.Error);
            _parseResult = new EventOccurrenceParseResult
            {
                Errors = { $"Error: {ex.Message}" }
            };
        }
        finally
        {
            _isParsing = false;
        }
    }

    private void HandleClear()
    {
        _inputText = string.Empty;
        _parseResult = null;
    }

    private void HandleClearResults()
    {
        _parseResult = null;
    }

    private async Task HandleSaveToDatabase()
    {
        if (_parseResult == null || !_parseResult.IsSuccess || _parseResult.TotalParsed == 0)
        {
            Snackbar.Add("No valid parsed occurrences to save", Severity.Warning);
            return;
        }

        _isSaving = true;
        try
        {
            var savedCount = 0;
            foreach (var kvp in _parseResult.Occurrences)
            {
                foreach (var occurrence in kvp.Value)
                {
                    // Add each occurrence to the database
                    await Context.EventOccurrences.AddAsync(occurrence);
                    savedCount++;
                }
            }

            await Context.SaveChangesAsync();
            Snackbar.Add($"Successfully saved {savedCount} occurrence(s) to database", Severity.Success);
            
            // Navigate back to the calendar index after a short delay
            await Task.Delay(1000);
            NavigationManager.NavigateTo("/calendar/event-occurrences");
        }
        catch (Exception ex)
        {
            Snackbar.Add($"Error saving to database: {ex.Message}", Severity.Error);
        }
        finally
        {
            _isSaving = false;
        }
    }

    private string GetEventName(EventDefinition eventDefinition)
    {
        if (eventDefinition == EventDefinition.GeneralSchedule)
            return "General Schedule";
        if (eventDefinition == EventDefinition.MeetTheCandidates)
            return "Meet the Candidates";
        if (eventDefinition == EventDefinition.ChapterOfficerMeeting)
            return "Chapter Officer Meeting";
        if (eventDefinition == EventDefinition.VotingDelegateMeeting)
            return "Voting Delegate Meeting";
        if (eventDefinition == EventDefinition.SocialGathering)
            return "Social Gathering";
        return eventDefinition.Name;
    }
}