using Microsoft.AspNetCore.WebUtilities;
using ScadaLink.Commons.Types.Audit;
using ScadaLink.Commons.Types.Enums;
using AuditLogPage = ScadaLink.CentralUI.Components.Pages.Audit.AuditLogPage;

namespace ScadaLink.CentralUI.Tests.Pages;

/// <summary>
/// Unit tests for <see cref="AuditLogPage.BuildExportUrl"/> (#23 M7-T14 /
/// Bundle F). Builds the <c>?...</c> querystring the Export-CSV link points
/// at; the same conversion is round-tripped on the server side by
/// <see cref="ScadaLink.CentralUI.Audit.AuditExportEndpoints.ParseFilter"/>.
/// These tests pin the no-filter base path + the round-trip back through
/// <see cref="QueryHelpers.ParseQuery"/> so the link contract stays stable.
/// </summary>
public class AuditLogPageExportUrlTests
{
    [Fact]
    public void BuildExportUrl_NullFilter_ReturnsBasePath()
    {
        var url = AuditLogPage.BuildExportUrl(null);
        Assert.Equal("/api/centralui/audit/export", url);
    }

    [Fact]
    public void BuildExportUrl_EmptyFilter_ReturnsBasePath()
    {
        // Defensive: a filter where every column is null should still render
        // as the bare path — no trailing "?" so the URL stays clean.
        var url = AuditLogPage.BuildExportUrl(new AuditLogQueryFilter());
        Assert.Equal("/api/centralui/audit/export", url);
    }

    [Fact]
    public void BuildExportUrl_AllFiltersSet_RoundTrips()
    {
        var corr = Guid.Parse("aaaaaaaa-aaaa-aaaa-aaaa-aaaaaaaaaaaa");
        var filter = new AuditLogQueryFilter(
            Channels: new[] { AuditChannel.ApiOutbound },
            Kinds: new[] { AuditKind.ApiCall },
            Statuses: new[] { AuditStatus.Failed },
            SourceSiteIds: new[] { "plant-a" },
            Target: "PaymentApi",
            Actor: "apikey-1",
            CorrelationId: corr,
            FromUtc: new DateTime(2026, 5, 20, 0, 0, 0, DateTimeKind.Utc),
            ToUtc: new DateTime(2026, 5, 20, 23, 59, 59, DateTimeKind.Utc));

        var url = AuditLogPage.BuildExportUrl(filter);

        Assert.StartsWith("/api/centralui/audit/export?", url);
        var query = QueryHelpers.ParseQuery(new Uri("http://x" + url).Query);

        Assert.Equal("ApiOutbound", query["channel"]);
        Assert.Equal("ApiCall", query["kind"]);
        Assert.Equal("Failed", query["status"]);
        Assert.Equal("plant-a", query["site"]);
        Assert.Equal("PaymentApi", query["target"]);
        Assert.Equal("apikey-1", query["actor"]);
        Assert.Equal(corr.ToString(), query["correlationId"]);
        Assert.Equal("2026-05-20T00:00:00.0000000Z", query["from"]);
        Assert.Equal("2026-05-20T23:59:59.0000000Z", query["to"]);
    }

    [Fact]
    public void BuildExportUrl_OnlyChannelSet_OmitsOtherParams()
    {
        var filter = new AuditLogQueryFilter(Channels: new[] { AuditChannel.Notification });

        var url = AuditLogPage.BuildExportUrl(filter);

        Assert.StartsWith("/api/centralui/audit/export?", url);
        var query = QueryHelpers.ParseQuery(new Uri("http://x" + url).Query);
        Assert.Single(query);
        Assert.Equal("Notification", query["channel"]);
    }

    [Fact]
    public void BuildExportUrl_ExecutionIdSet_EmitsExecutionIdParam()
    {
        var exec = Guid.Parse("12121212-3434-5656-7878-909090909090");
        var filter = new AuditLogQueryFilter(ExecutionId: exec);

        var url = AuditLogPage.BuildExportUrl(filter);

        Assert.StartsWith("/api/centralui/audit/export?", url);
        var query = QueryHelpers.ParseQuery(new Uri("http://x" + url).Query);
        Assert.Single(query);
        Assert.Equal(exec.ToString(), query["executionId"]);
    }

    [Fact]
    public void BuildExportUrl_ParentExecutionIdSet_EmitsParentExecutionIdParam()
    {
        var parent = Guid.Parse("34343434-5656-7878-9090-121212121212");
        var filter = new AuditLogQueryFilter(ParentExecutionId: parent);

        var url = AuditLogPage.BuildExportUrl(filter);

        Assert.StartsWith("/api/centralui/audit/export?", url);
        var query = QueryHelpers.ParseQuery(new Uri("http://x" + url).Query);
        Assert.Single(query);
        Assert.Equal(parent.ToString(), query["parentExecutionId"]);
    }

    [Fact]
    public void BuildExportUrl_MultiValueDimensions_EmitRepeatedParams()
    {
        // Task 9: each multi-value dimension emits one repeated query-string key
        // per selected value so the export endpoint's ParseFilter sees them all.
        var filter = new AuditLogQueryFilter(
            Channels: new[] { AuditChannel.ApiOutbound, AuditChannel.DbOutbound },
            Statuses: new[] { AuditStatus.Failed, AuditStatus.Parked },
            SourceSiteIds: new[] { "plant-a", "plant-b" });

        var url = AuditLogPage.BuildExportUrl(filter);

        var query = QueryHelpers.ParseQuery(new Uri("http://x" + url).Query);
        Assert.Equal(new[] { "ApiOutbound", "DbOutbound" }, query["channel"].ToArray());
        Assert.Equal(new[] { "Failed", "Parked" }, query["status"].ToArray());
        Assert.Equal(new[] { "plant-a", "plant-b" }, query["site"].ToArray());
    }
}