using System.Text;
using Microsoft.AspNetCore.Mvc;
using SQLInsight.Contracts;
using SQLInsight.Repository;

namespace SQLInsight.Web;

/// <summary>
/// Support cases with SEOSoft (Professional/Enterprise). The form posts here; the request is stored in the repository
/// and the agent sends it to SQLInsight Hub, which gives it a case number. The web UI never talks to the hub itself.
/// </summary>
public static class Support
{
    public static void Map(IEndpointRouteBuilder app) => app.MapPost("/support", CreateAsync);

    /// <summary>Title and description for a case about <paramref name="finding"/>. Sensitive measurements are left out.</summary>
    public static (string Title, string Description) Prefill(StoredFinding finding)
    {
        ArgumentNullException.ThrowIfNull(finding);
        var text = new StringBuilder();
        text.Append("Instans: ").Append(finding.InstanceName).Append('\n');
        text.Append("Regel: ").Append(finding.RuleId).Append('\n');
        text.Append("Alvor: ").Append(Display.SeverityName(finding.Severity)).Append('\n');
        if (!string.IsNullOrEmpty(finding.Subject))
        {
            text.Append("Emne: ").Append(finding.Subject).Append('\n');
        }

        text.Append('\n').Append(finding.Explanation).Append('\n');
        var evidence = finding.Evidence.Where(e => !e.Sensitive).Take(10).ToList();
        if (evidence.Count > 0)
        {
            text.Append("\nMålinger:\n");
            foreach (var e in evidence)
            {
                text.Append("- ").Append(e.Name).Append(": ").Append(e.Value.Length > 200 ? e.Value[..200] + "…" : e.Value).Append('\n');
            }
        }

        text.Append("\nHvad har I prøvet, og hvad har ændret sig?\n");
        var title = finding.Title.Length > SupportCaseRequest.MaxTitle ? finding.Title[..SupportCaseRequest.MaxTitle] : finding.Title;
        var description = text.ToString();
        return (title, description.Length > SupportCaseRequest.MaxDescription ? description[..SupportCaseRequest.MaxDescription] : description);
    }

    /// <summary>The user part of DOMAIN\user, as a starting point for the contact name.</summary>
    public static string ContactNameFrom(string? windowsUser) =>
        windowsUser is { Length: > 0 } user ? user[(user.LastIndexOf('\\') + 1)..] : string.Empty;

    public static string StatusText(SupportCaseRow row)
    {
        ArgumentNullException.ThrowIfNull(row);
        return row.Status switch
        {
            SupportCaseStatus.Pending => row.Attempts > 0 ? "Venter på hubben (prøver igen)" : "Sendes",
            SupportCaseStatus.Open => "Åben",
            SupportCaseStatus.Closed => "Lukket",
            _ => "Afvist",
        };
    }

    private static async Task<IResult> CreateAsync(
        HttpContext http, InsightRepository repository,
        [FromForm] string? title, [FromForm] string? description, [FromForm] string? contactName, [FromForm] string? contactEmail,
        [FromForm] string? contactPhone, [FromForm] long? findingId)
    {
        var back = findingId is { } id ? $"&fund={id}" : string.Empty;
        if ((await repository.GetHubStatusAsync(http.RequestAborted))?.AllowsSupportCases != true)
        {
            return Results.Redirect("/support?fejl=" + Uri.EscapeDataString("Supportsager kræver Professional eller Enterprise og at deling med SQLInsight Hub er slået til."));
        }

        var finding = findingId is { } fid ? await repository.GetFindingAsync(fid, http.RequestAborted) : null;
        var request = new SupportCaseRequest(Guid.NewGuid(), title?.Trim() ?? string.Empty, Blank(description), contactName?.Trim() ?? string.Empty,
            contactEmail?.Trim() ?? string.Empty, Blank(contactPhone), http.User.Identity?.Name, finding?.InstanceName, finding?.RuleId, finding?.Subject);
        if (request.Validate() is { } invalid)
        {
            return Results.Redirect("/support?fejl=" + Uri.EscapeDataString(invalid) + back);
        }

        await repository.AddSupportRequestAsync(new NewSupportRequest(request.ClientRequestId, request.Title, request.Description, request.ContactName,
            request.ContactEmail, request.ContactPhone, request.RequestedBy, finding?.FindingId, finding?.InstanceName, finding?.RuleId, finding?.Subject),
            DateTimeOffset.UtcNow, http.RequestAborted);
        return Results.Redirect("/support?sendt=1");
    }

    private static string? Blank(string? value) => string.IsNullOrWhiteSpace(value) ? null : value.Trim();
}