@page "/hosts/export"
@using RackPeek.Domain.UseCases.Hosts
@inject HostsFileExportUseCase HostsUseCase

<div class="border border-zinc-800 rounded p-4 bg-zinc-900 max-w-5xl mx-auto"
     data-testid="hosts-export-page">

    <div class="flex justify-between items-center mb-4">
        <div class="text-zinc-100 text-lg">
            Hosts File Export
        </div>

        <button class="text-sm bg-emerald-600 hover:bg-emerald-500 px-3 py-1 rounded text-white transition"
                data-testid="generate-hosts-button"
                @onclick="GenerateExport">
            Generate
        </button>
    </div>

    <!-- Options -->
    <div class="grid grid-cols-1 md:grid-cols-2 gap-4 mb-6">

        <!-- Include Tags -->
        <div>
            <div class="text-zinc-400 mb-1">Include Tags</div>
            <input class="w-full bg-zinc-800 text-zinc-200 p-2 rounded border border-zinc-700"
                   placeholder="prod, staging"
                   data-testid="hosts-include-tags-input"
                   @bind="_includeTagsRaw"/>
            <div class="text-xs text-zinc-500 mt-1">
                Only include resources with these tags (optional)
            </div>
        </div>

        <!-- Domain Suffix -->
        <div>
            <div class="text-zinc-400 mb-1">Domain Suffix</div>
            <input class="w-full bg-zinc-800 text-zinc-200 p-2 rounded border border-zinc-700"
                   placeholder="home.local"
                   data-testid="hosts-domain-suffix-input"
                   @bind="_domainSuffix"/>
            <div class="text-xs text-zinc-500 mt-1">
                Appends .domain to host names (optional)
            </div>
        </div>

        <!-- Include Localhost Defaults -->
        <div class="flex items-center space-x-2">
            <input type="checkbox"
                   class="accent-emerald-600"
                   data-testid="hosts-include-localhost-checkbox"
                   @bind="_includeLocalhost"/>
            <label class="text-zinc-300">
                Include localhost defaults (127.0.0.1 / ::1)
            </label>
        </div>

    </div>

    <!-- Warnings -->
    @if (_warnings.Any())
    {
        <div class="border border-red-700 bg-red-900/40 text-red-300 p-3 rounded mb-4"
             data-testid="hosts-warnings">
            <div class="font-semibold mb-1">Warnings</div>
            <ul class="list-disc ml-5 text-sm">
                @foreach (var warning in _warnings)
                {
                    <li>@warning</li>
                }
            </ul>
        </div>
    }

    <!-- Output -->
    <div>
        <div class="text-zinc-400 mb-1">Generated Hosts File</div>
        <textarea class="w-full bg-black text-emerald-400 p-3 rounded border border-zinc-800 font-mono text-sm"
                  rows="18"
                  readonly
                  data-testid="hosts-output">
@_hostsText
        </textarea>
    </div>

</div>

@code {

    private string _includeTagsRaw = string.Empty;
    private string? _domainSuffix = "home.local";
    private bool _includeLocalhost = true;

    private string _hostsText = string.Empty;
    private List<string> _warnings = new();

    private async Task GenerateExport()
    {
        try
        {
            _warnings.Clear();
            _hostsText = string.Empty;

            var options = new HostsExportOptions
            {
                IncludeTags = ParseCsv(_includeTagsRaw),
                DomainSuffix = string.IsNullOrWhiteSpace(_domainSuffix)
                    ? null
                    : _domainSuffix,
                IncludeLocalhostDefaults = _includeLocalhost
            };

            var result = await HostsUseCase.ExecuteAsync(options);

            if (result is null)
            {
                _warnings.Add("Hosts export returned null.");
                return;
            }

            _hostsText = result.HostsText;
            _warnings = result.Warnings.ToList();
        }
        catch (Exception ex)
        {
            _warnings.Clear();
            _warnings.Add($"Unexpected error: {ex.Message}");
        }
    }

    private static IReadOnlyList<string> ParseCsv(string raw)
    {
        if (string.IsNullOrWhiteSpace(raw))
            return [];

        return raw.Split(',', StringSplitOptions.RemoveEmptyEntries)
            .Select(x => x.Trim())
            .Where(x => !string.IsNullOrWhiteSpace(x))
            .ToArray();
    }

}