using Microsoft.EntityFrameworkCore;
using ZB.MOM.WW.ScadaBridge.Commons.Entities.Deployment;
using ZB.MOM.WW.ScadaBridge.Commons.Entities.Instances;
using ZB.MOM.WW.ScadaBridge.Commons.Entities.Sites;
using ZB.MOM.WW.ScadaBridge.Commons.Entities.Templates;
using ZB.MOM.WW.ScadaBridge.Commons.Types.Deployment;
using ZB.MOM.WW.ScadaBridge.Commons.Types.Enums;
using ZB.MOM.WW.ScadaBridge.ConfigurationDatabase.Repositories;

namespace ZB.MOM.WW.ScadaBridge.ConfigurationDatabase.Tests;

/// <summary>
/// Coverage for the Central UI deployment-status page's server-side read path —
/// <see cref="DeploymentManagerRepository.QueryDeploymentListPageAsync"/> and
/// <see cref="DeploymentManagerRepository.GetDeploymentStatusCountsAsync"/>
/// (residual R3).
///
/// <para>
/// These replace a whole-table <c>GetAllDeploymentRecords</c> read whose only
/// caller then site-scoped, sorted, counted the status tiles and sliced a page in
/// the Blazor circuit's memory. Every one of those jobs is asserted here to happen
/// in SQL instead: the filter dimensions, the total count, the deterministic
/// ordering that makes offset paging safe, and the grouped tile aggregation.
/// </para>
///
/// <para>
/// Uses the shared SQLite in-memory fixture. It enforces the
/// <c>DeploymentRecord → Instance</c> FK, which is exactly the relationship the
/// new query's inner join relies on, so the seeds are real Site/Template/Instance
/// rows.
/// </para>
/// </summary>
public class DeploymentListQueryRepositoryTests : IDisposable
{
    private readonly ScadaBridgeDbContext _context;
    private readonly DeploymentManagerRepository _repository;
    private readonly DateTimeOffset _base = new(2026, 8, 15, 12, 0, 0, TimeSpan.Zero);

    public DeploymentListQueryRepositoryTests()
    {
        _context = SqliteTestHelper.CreateInMemoryContext();
        _repository = new DeploymentManagerRepository(_context);
    }

    public void Dispose()
    {
        _context.Database.CloseConnection();
        _context.Dispose();
        GC.SuppressFinalize(this);
    }

    private async Task<int> SeedSiteAsync(string name)
    {
        var site = new Site(name, name);
        _context.Sites.Add(site);
        await _context.SaveChangesAsync();
        return site.Id;
    }

    private async Task<int> SeedInstanceAsync(string uniqueName, int siteId)
    {
        var template = new Template($"T-{uniqueName}");
        _context.Templates.Add(template);
        await _context.SaveChangesAsync();

        var instance = new Instance(uniqueName) { SiteId = siteId, TemplateId = template.Id };
        _context.Instances.Add(instance);
        await _context.SaveChangesAsync();
        return instance.Id;
    }

    private async Task<DeploymentRecord> SeedRecordAsync(
        string deploymentId,
        int instanceId,
        DeploymentStatus status,
        DateTimeOffset deployedAt,
        string deployedBy = "alice",
        string? revisionHash = null)
    {
        var record = new DeploymentRecord(deploymentId, deployedBy)
        {
            InstanceId = instanceId,
            Status = status,
            DeployedAt = deployedAt,
            RevisionHash = revisionHash
        };
        _context.DeploymentRecords.Add(record);
        await _context.SaveChangesAsync();
        return record;
    }

    // ── Paging ────────────────────────────────────────────────────────────────

    [Fact]
    public async Task QueryPage_ReturnsRequestedSlice_AndTheTotalCountOfTheWholeSet()
    {
        var siteId = await SeedSiteAsync("S1");
        var instanceId = await SeedInstanceAsync("Inst-1", siteId);
        for (var i = 0; i < 25; i++)
        {
            await SeedRecordAsync($"dep-{i:D3}", instanceId, DeploymentStatus.Success, _base.AddMinutes(i));
        }

        var page2 = await _repository.QueryDeploymentListPageAsync(
            new DeploymentListFilter(), pageNumber: 2, pageSize: 10);

        Assert.Equal(25, page2.TotalCount);
        Assert.Equal(10, page2.Rows.Count);
        Assert.Equal(3, page2.PageCount(10));

        // Newest first: page 2 of 10 starts at the 11th newest, dep-014.
        Assert.Equal("dep-014", page2.Rows[0].DeploymentId);
        Assert.Equal("dep-005", page2.Rows[^1].DeploymentId);
    }

    [Fact]
    public async Task QueryPage_PagesDoNotOverlapOrDropRows_EvenWhenDeployedAtTies()
    {
        // Rapid redeploys write several records on the same clock tick. Without the
        // Id tie-break the sort key is unstable and offset paging repeats or drops
        // rows between pages — the failure mode the ThenByDescending(Id) prevents.
        var siteId = await SeedSiteAsync("S1");
        var instanceId = await SeedInstanceAsync("Inst-1", siteId);
        for (var i = 0; i < 9; i++)
        {
            await SeedRecordAsync($"dep-{i:D3}", instanceId, DeploymentStatus.Success, _base);
        }

        var seen = new List<string>();
        for (var page = 1; page <= 3; page++)
        {
            var result = await _repository.QueryDeploymentListPageAsync(
                new DeploymentListFilter(), pageNumber: page, pageSize: 3);
            seen.AddRange(result.Rows.Select(r => r.DeploymentId));
        }

        Assert.Equal(9, seen.Count);
        Assert.Equal(9, seen.Distinct().Count());
    }

    [Fact]
    public async Task QueryPage_NonPositivePageNumber_IsFlooredAtPageOne()
    {
        var siteId = await SeedSiteAsync("S1");
        var instanceId = await SeedInstanceAsync("Inst-1", siteId);
        await SeedRecordAsync("dep-000", instanceId, DeploymentStatus.Success, _base);

        var page = await _repository.QueryDeploymentListPageAsync(
            new DeploymentListFilter(), pageNumber: 0, pageSize: 10);

        Assert.Single(page.Rows);
    }

    [Fact]
    public async Task QueryPage_OversizedPageSize_IsClampedToTheMaximum()
    {
        var siteId = await SeedSiteAsync("S1");
        var instanceId = await SeedInstanceAsync("Inst-1", siteId);
        await SeedRecordAsync("dep-000", instanceId, DeploymentStatus.Success, _base);

        // A caller asking for int.MaxValue rows must not be able to turn the paged
        // read back into the whole-table read it replaced.
        var page = await _repository.QueryDeploymentListPageAsync(
            new DeploymentListFilter(), pageNumber: 1, pageSize: int.MaxValue);

        Assert.Single(page.Rows);
        Assert.True(DeploymentRecordSummary.MaxPageSize > 0);
    }

    [Fact]
    public async Task QueryPage_PastTheEnd_ReturnsNoRowsButStillReportsTheTotal()
    {
        var siteId = await SeedSiteAsync("S1");
        var instanceId = await SeedInstanceAsync("Inst-1", siteId);
        await SeedRecordAsync("dep-000", instanceId, DeploymentStatus.Success, _base);

        var page = await _repository.QueryDeploymentListPageAsync(
            new DeploymentListFilter(), pageNumber: 9, pageSize: 25);

        Assert.Empty(page.Rows);
        Assert.Equal(1, page.TotalCount);
    }

    // ── Joined projection ─────────────────────────────────────────────────────

    [Fact]
    public async Task QueryPage_JoinsTheInstance_SoNameAndSiteTravelWithTheRow()
    {
        var siteId = await SeedSiteAsync("S1");
        var instanceId = await SeedInstanceAsync("Line3.Filler", siteId);
        await SeedRecordAsync("dep-000", instanceId, DeploymentStatus.Failed, _base,
            deployedBy: "bob", revisionHash: "abc123");

        var row = Assert.Single(
            (await _repository.QueryDeploymentListPageAsync(new DeploymentListFilter(), 1, 25)).Rows);

        Assert.Equal("Line3.Filler", row.InstanceUniqueName);
        Assert.Equal(siteId, row.SiteId);
        Assert.Equal(instanceId, row.InstanceId);
        Assert.Equal("dep-000", row.DeploymentId);
        Assert.Equal(DeploymentStatus.Failed, row.Status);
        Assert.Equal("bob", row.DeployedBy);
        Assert.Equal("abc123", row.RevisionHash);
    }

    // ── Filters ───────────────────────────────────────────────────────────────

    [Fact]
    public async Task QueryPage_StatusFilter_IsAppliedInTheDatabase()
    {
        var siteId = await SeedSiteAsync("S1");
        var instanceId = await SeedInstanceAsync("Inst-1", siteId);
        await SeedRecordAsync("dep-ok", instanceId, DeploymentStatus.Success, _base);
        await SeedRecordAsync("dep-bad", instanceId, DeploymentStatus.Failed, _base.AddMinutes(1));

        var page = await _repository.QueryDeploymentListPageAsync(
            new DeploymentListFilter(Status: DeploymentStatus.Failed), 1, 25);

        Assert.Equal(1, page.TotalCount);
        Assert.Equal("dep-bad", Assert.Single(page.Rows).DeploymentId);
    }

    [Fact]
    public async Task QueryPage_InstanceFilter_RestrictsToOneInstanceHistory()
    {
        var siteId = await SeedSiteAsync("S1");
        var a = await SeedInstanceAsync("Inst-A", siteId);
        var b = await SeedInstanceAsync("Inst-B", siteId);
        await SeedRecordAsync("dep-a", a, DeploymentStatus.Success, _base);
        await SeedRecordAsync("dep-b", b, DeploymentStatus.Success, _base);

        var page = await _repository.QueryDeploymentListPageAsync(
            new DeploymentListFilter(InstanceId: b), 1, 25);

        Assert.Equal("dep-b", Assert.Single(page.Rows).DeploymentId);
    }

    [Theory]
    [InlineData("Filler", "dep-a")]     // instance unique name
    [InlineData("dep-b", "dep-b")]      // deployment id
    [InlineData("carol", "dep-b")]      // initiating user
    [InlineData("rev-a", "dep-a")]      // revision hash
    public async Task QueryPage_Search_MatchesAcrossTheFindableIdentifiers(string term, string expected)
    {
        var siteId = await SeedSiteAsync("S1");
        var a = await SeedInstanceAsync("Line3.Filler", siteId);
        var b = await SeedInstanceAsync("Line4.Capper", siteId);
        await SeedRecordAsync("dep-a", a, DeploymentStatus.Success, _base, deployedBy: "alice", revisionHash: "rev-a1");
        await SeedRecordAsync("dep-b", b, DeploymentStatus.Success, _base.AddMinutes(1), deployedBy: "carol", revisionHash: "rev-b1");

        var page = await _repository.QueryDeploymentListPageAsync(
            new DeploymentListFilter(Search: term), 1, 25);

        Assert.Equal(expected, Assert.Single(page.Rows).DeploymentId);
    }

    [Fact]
    public async Task QueryPage_WhitespaceSearch_IsTreatedAsUnconstrained()
    {
        var siteId = await SeedSiteAsync("S1");
        var instanceId = await SeedInstanceAsync("Inst-1", siteId);
        await SeedRecordAsync("dep-000", instanceId, DeploymentStatus.Success, _base);

        var page = await _repository.QueryDeploymentListPageAsync(
            new DeploymentListFilter(Search: "   "), 1, 25);

        Assert.Equal(1, page.TotalCount);
    }

    [Fact]
    public async Task QueryPage_SiteScope_RestrictsToTheGrantedSites()
    {
        var s1 = await SeedSiteAsync("S1");
        var s2 = await SeedSiteAsync("S2");
        var a = await SeedInstanceAsync("Inst-A", s1);
        var b = await SeedInstanceAsync("Inst-B", s2);
        await SeedRecordAsync("dep-a", a, DeploymentStatus.Success, _base);
        await SeedRecordAsync("dep-b", b, DeploymentStatus.Success, _base.AddMinutes(1));

        var page = await _repository.QueryDeploymentListPageAsync(
            new DeploymentListFilter(SiteIdScope: new[] { s2 }), 1, 25);

        Assert.Equal(1, page.TotalCount);
        Assert.Equal("dep-b", Assert.Single(page.Rows).DeploymentId);
    }

    [Fact]
    public async Task QueryPage_EmptySiteScope_IsARealFilterThatMatchesNothing()
    {
        // A scoped user granted no sites must see nothing — an empty scope must NOT
        // degrade into "unconstrained", which would leak every site's deployments.
        var siteId = await SeedSiteAsync("S1");
        var instanceId = await SeedInstanceAsync("Inst-1", siteId);
        await SeedRecordAsync("dep-000", instanceId, DeploymentStatus.Success, _base);

        var page = await _repository.QueryDeploymentListPageAsync(
            new DeploymentListFilter(SiteIdScope: Array.Empty<int>()), 1, 25);

        Assert.Equal(0, page.TotalCount);
        Assert.Empty(page.Rows);
    }

    // ── Status counts ─────────────────────────────────────────────────────────

    [Fact]
    public async Task StatusCounts_GroupsEveryStatus_WithAbsentOnesReportedAsZero()
    {
        var siteId = await SeedSiteAsync("S1");
        var instanceId = await SeedInstanceAsync("Inst-1", siteId);
        await SeedRecordAsync("dep-1", instanceId, DeploymentStatus.Success, _base);
        await SeedRecordAsync("dep-2", instanceId, DeploymentStatus.Success, _base.AddMinutes(1));
        await SeedRecordAsync("dep-3", instanceId, DeploymentStatus.Failed, _base.AddMinutes(2));
        await SeedRecordAsync("dep-4", instanceId, DeploymentStatus.InProgress, _base.AddMinutes(3));

        var counts = await _repository.GetDeploymentStatusCountsAsync(new DeploymentListFilter());

        Assert.Equal(0, counts.Pending);
        Assert.Equal(1, counts.InProgress);
        Assert.Equal(2, counts.Success);
        Assert.Equal(1, counts.Failed);
        Assert.Equal(4, counts.Total);
    }

    [Fact]
    public async Task StatusCounts_IgnoreTheStatusFilter_SoEachTileKeepsItsOwnTotal()
    {
        // The tiles are the status BREAKDOWN of the filtered set. Honouring the
        // active status filter here would zero the other three tiles the moment an
        // operator clicked one.
        var siteId = await SeedSiteAsync("S1");
        var instanceId = await SeedInstanceAsync("Inst-1", siteId);
        await SeedRecordAsync("dep-1", instanceId, DeploymentStatus.Success, _base);
        await SeedRecordAsync("dep-2", instanceId, DeploymentStatus.Failed, _base.AddMinutes(1));

        var counts = await _repository.GetDeploymentStatusCountsAsync(
            new DeploymentListFilter(Status: DeploymentStatus.Failed));

        Assert.Equal(1, counts.Success);
        Assert.Equal(1, counts.Failed);
        Assert.Equal(2, counts.Total);
    }

    [Fact]
    public async Task StatusCounts_HonourEveryOtherFilterDimension()
    {
        var s1 = await SeedSiteAsync("S1");
        var s2 = await SeedSiteAsync("S2");
        var a = await SeedInstanceAsync("Inst-A", s1);
        var b = await SeedInstanceAsync("Inst-B", s2);
        await SeedRecordAsync("dep-a1", a, DeploymentStatus.Success, _base);
        await SeedRecordAsync("dep-a2", a, DeploymentStatus.Failed, _base.AddMinutes(1));
        await SeedRecordAsync("dep-b1", b, DeploymentStatus.Success, _base.AddMinutes(2));

        var scoped = await _repository.GetDeploymentStatusCountsAsync(
            new DeploymentListFilter(SiteIdScope: new[] { s1 }));
        Assert.Equal(2, scoped.Total);

        var searched = await _repository.GetDeploymentStatusCountsAsync(
            new DeploymentListFilter(Search: "Inst-B"));
        Assert.Equal(1, searched.Total);
        Assert.Equal(1, searched.Success);

        var byInstance = await _repository.GetDeploymentStatusCountsAsync(
            new DeploymentListFilter(InstanceId: a));
        Assert.Equal(2, byInstance.Total);
    }

    [Fact]
    public async Task StatusCounts_EmptySet_IsAllZeros()
    {
        var counts = await _repository.GetDeploymentStatusCountsAsync(new DeploymentListFilter());

        Assert.Equal(DeploymentStatusCounts.Empty, counts);
    }
}
