using System.Net;
using System.Net.Http.Json;
using System.Text.Json;
using DongfangHydro.Dashboard.Api.Data;
using DongfangHydro.Dashboard.Api.Contracts;
using DongfangHydro.Dashboard.Api.Realtime;
using Microsoft.AspNetCore.Hosting;
using Microsoft.AspNetCore.Mvc.Testing;
using Microsoft.EntityFrameworkCore;
using Microsoft.Extensions.Configuration;
using Microsoft.Extensions.DependencyInjection;
using Microsoft.Extensions.DependencyInjection.Extensions;
using Xunit;

namespace DongfangHydro.Dashboard.Tests;

public sealed class DashboardApiTests(DashboardApiFactory factory)
    : IClassFixture<DashboardApiFactory>
{
    [Fact]
    public async Task Orders_SearchesSeededWaterConservancyProductNames()
    {
        using var client = factory.CreateClient();

        var response = await client.GetAsync("/api/orders?keyword=门架&page=1&pageSize=20");
        var body = await response.Content.ReadFromJsonAsync<JsonElement>();

        Assert.Equal(HttpStatusCode.OK, response.StatusCode);
        Assert.True(body.GetProperty("total").GetInt32() >= 1);
        Assert.Contains(
            body.GetProperty("items").EnumerateArray(),
            item => item.GetProperty("productName").GetString()!.Contains("门架", StringComparison.Ordinal));
    }

    [Fact]
    public async Task OrderTree_ReturnsTheCompleteSeededHierarchy()
    {
        using var client = factory.CreateClient();
        var orders = await client.GetFromJsonAsync<JsonElement>("/api/orders?page=1&pageSize=20");
        var orderId = orders.GetProperty("items")[0].GetProperty("id").GetString();

        var root = await client.GetFromJsonAsync<JsonElement>($"/api/orders/{orderId}/tree");

        Assert.Equal("order", root.GetProperty("nodeType").GetString());
        Assert.Equal(66, CountNodes(root));
        Assert.Equal(1, CountNodes(root, "order"));
        Assert.Equal(5, CountNodes(root, "part"));
        Assert.Equal(15, CountNodes(root, "component"));
        Assert.Equal(45, CountNodes(root, "process"));
        Assert.False(string.IsNullOrWhiteSpace(FindFirstProcess(root).GetProperty("version").GetString()));
    }

    [Fact]
    public async Task UpdateProgress_RecalculatesTheOrderAndReturnsTheUpdatedNode()
    {
        using var client = factory.CreateClient();
        factory.UpdateQueue.Reset();
        var orders = await client.GetFromJsonAsync<JsonElement>("/api/orders?page=1&pageSize=20");
        var orderId = orders.GetProperty("items")[0].GetProperty("id").GetString();
        var root = await client.GetFromJsonAsync<JsonElement>($"/api/orders/{orderId}/tree");
        var process = FindFirstProcess(root);

        var response = await client.PatchAsJsonAsync(
            $"/api/nodes/{process.GetProperty("id").GetString()}/progress",
            new
            {
                completedQty = process.GetProperty("requiredQty").GetInt32(),
                expectedVersion = process.GetProperty("version").GetString(),
                status = "done",
                riskLevel = "normal",
                delayDays = 0,
                delayReason = string.Empty,
            });
        var updated = await response.Content.ReadFromJsonAsync<JsonElement>();

        Assert.Equal(HttpStatusCode.OK, response.StatusCode);
        Assert.Equal(100, updated.GetProperty("node").GetProperty("progress").GetInt32());
        Assert.Equal("done", updated.GetProperty("node").GetProperty("status").GetString());
        Assert.Equal(orderId, updated.GetProperty("order").GetProperty("id").GetString());
        Assert.Equal(1, factory.UpdateQueue.EnqueueCount);
    }

    [Fact]
    public async Task UpdateProgress_RejectsARequestWithoutCompletedQuantity()
    {
        using var client = factory.CreateClient();
        var process = await GetFirstProcessAsync(client);

        var response = await client.PatchAsJsonAsync(
            $"/api/nodes/{process.GetProperty("id").GetString()}/progress",
            new { status = "in_progress" });

        Assert.Equal(HttpStatusCode.BadRequest, response.StatusCode);
    }

    [Fact]
    public async Task UpdateProgress_RejectsDoneStatusBeforeThePlannedQuantityIsComplete()
    {
        using var client = factory.CreateClient();
        var process = await GetFirstProcessAsync(client);
        var requiredQty = process.GetProperty("requiredQty").GetInt32();

        var response = await client.PatchAsJsonAsync(
            $"/api/nodes/{process.GetProperty("id").GetString()}/progress",
            new
            {
                completedQty = requiredQty - 1,
                expectedVersion = process.GetProperty("version").GetString(),
                status = "done",
                riskLevel = "normal",
            });

        Assert.Equal(HttpStatusCode.BadRequest, response.StatusCode);
    }

    [Fact]
    public async Task UpdateProgress_RequiresTheClientsExpectedVersion()
    {
        using var client = factory.CreateClient();
        var process = await GetFirstProcessAsync(client);

        var response = await client.PatchAsJsonAsync(
            $"/api/nodes/{process.GetProperty("id").GetString()}/progress",
            new
            {
                completedQty = process.GetProperty("completedQty").GetInt32(),
                status = process.GetProperty("status").GetString(),
                riskLevel = process.GetProperty("riskLevel").GetString(),
            });

        Assert.Equal(HttpStatusCode.BadRequest, response.StatusCode);
    }

    private static int CountNodes(JsonElement node)
    {
        var count = 1;
        if (node.TryGetProperty("children", out var children))
        {
            count += children.EnumerateArray().Sum(CountNodes);
        }

        return count;
    }

    private static int CountNodes(JsonElement node, string nodeType)
    {
        var count = node.GetProperty("nodeType").GetString() == nodeType ? 1 : 0;
        if (node.TryGetProperty("children", out var children))
        {
            count += children.EnumerateArray().Sum(child => CountNodes(child, nodeType));
        }

        return count;
    }

    private static async Task<JsonElement> GetFirstProcessAsync(HttpClient client)
    {
        var orders = await client.GetFromJsonAsync<JsonElement>("/api/orders?page=1&pageSize=20");
        var orderId = orders.GetProperty("items")[0].GetProperty("id").GetString();
        var root = await client.GetFromJsonAsync<JsonElement>($"/api/orders/{orderId}/tree");
        return FindFirstProcess(root);
    }

    private static JsonElement FindFirstProcess(JsonElement node)
    {
        if (node.GetProperty("nodeType").GetString() == "process")
        {
            return node;
        }

        foreach (var child in node.GetProperty("children").EnumerateArray())
        {
            var match = FindFirstProcess(child);
            if (match.ValueKind != JsonValueKind.Undefined)
            {
                return match;
            }
        }

        return default;
    }
}

public sealed class DashboardApiFactory : WebApplicationFactory<Program>
{
    private readonly string databaseName = $"dashboard-tests-{Guid.NewGuid():N}";

    public RecordingDashboardUpdateQueue UpdateQueue { get; } = new();

    protected override void ConfigureWebHost(IWebHostBuilder builder)
    {
        builder.UseEnvironment("Testing");
        builder.ConfigureAppConfiguration((_, configuration) =>
        {
            configuration.AddInMemoryCollection(new Dictionary<string, string?>
            {
                ["Database:AutoMigrate"] = "true",
                ["Database:Seed"] = "true",
            });
        });
        builder.ConfigureServices(services =>
        {
            services.RemoveAll<DbContextOptions<DashboardDbContext>>();
            services.AddDbContext<DashboardDbContext>(options =>
                options.UseInMemoryDatabase(databaseName));
            services.RemoveAll<IDashboardUpdateQueue>();
            services.AddSingleton<IDashboardUpdateQueue>(UpdateQueue);
        });
    }
}

public sealed class RecordingDashboardUpdateQueue : IDashboardUpdateQueue
{
    public int EnqueueCount { get; private set; }

    public ValueTask EnqueueAsync(
        UpdateNodeProgressResultDto update,
        CancellationToken cancellationToken)
    {
        EnqueueCount++;
        return ValueTask.CompletedTask;
    }

    public void Reset()
    {
        EnqueueCount = 0;
    }
}