using System.Net;
using System.Net.Http.Headers;
using System.Net.Http.Json;
using System.Text.Json;
using Microsoft.AspNetCore.TestHost;
using WxAgent.Service;
using Xunit;

namespace WxAgent.Service.Tests;

public sealed class BroadcastOperationTests
{
    private sealed class Backend(bool failSecond = false) : IAgentBackend
    {
        public List<string> SentTargets { get; } = [];

        public IReadOnlyList<AgentCapability> Capabilities =>
        [
            new("sessions-list", true, true, true, true, false, "read", false, 30, null, []),
            new("broadcast-text", true, false, true, true, true, "write", true, 30, null, []),
            new("send-text", true, false, true, true, true, "write", false, 30, null, [])
        ];

        public Task<object> StatusAsync(CancellationToken cancellationToken) => Task.FromResult<object>(new { ok = true });

        public Task<IReadOnlyList<SessionInfo>> SessionsAsync(CancellationToken cancellationToken) =>
            Task.FromResult<IReadOnlyList<SessionInfo>>([
                new("A", "session-a", false),
                new("B", "session-b", false),
                new("C", "session-c", false)
            ]);

        public Task SendTextAsync(string accountId, string targetId, string text, CancellationToken cancellationToken)
        {
            if (failSecond && targetId == "session-b")
                throw new ServiceException("TargetUnavailable", 409, "Target is no longer available.");
            SentTargets.Add(targetId);
            return Task.CompletedTask;
        }
    }

    [Fact]
    public async Task BroadcastFreezesTargetsRunsInOrderAndReplaysIdempotently()
    {
        var dir = Path.Combine(Path.GetTempPath(), Guid.NewGuid().ToString("N")); Directory.CreateDirectory(dir);
        var token = new string('D', 43);
        var options = new ServiceOptions { CredentialFile = Path.Combine(dir, "credentials.json"), DataDirectory = dir };
        File.WriteAllText(options.CredentialFile, JsonSerializer.Serialize(new[]
        {
            new ServiceCredential("p", ServiceOptions.HashToken(token), ["read", "write"], [])
        }));
        var backend = new Backend();
        await using var app = ServiceHost.Build(options, backend, b => b.WebHost.UseTestServer());
        try
        {
            await app.StartAsync();
            using var client = app.GetTestClient();
            client.BaseAddress = new Uri("http://localhost:5088");
            client.DefaultRequestHeaders.Authorization = new AuthenticationHeaderValue("Bearer", token);
            var request = new
            {
                kind = "broadcast-text",
                accountId = "account-1",
                targets = new[] { "session-a", "session-a", "session-b" },
                text = "broadcast-test",
                idempotencyKey = "broadcast-1",
                confirmed = true,
                stopOnError = true
            };

            var submitted = await client.PostAsJsonAsync("/api/v1/operations", request);
            Assert.Equal(HttpStatusCode.OK, submitted.StatusCode);
            var queued = await submitted.Content.ReadFromJsonAsync<JsonElement>();
            var operationId = queued.GetProperty("id").GetString();
            Assert.False(string.IsNullOrWhiteSpace(operationId));
            var completed = await WaitForTerminalAsync(client, operationId!);
            Assert.Equal("Succeeded", completed.GetProperty("state").GetString());
            Assert.Equal(["session-a", "session-b"], backend.SentTargets);

            var details = JsonDocument.Parse(completed.GetProperty("details").GetString()!).RootElement;
            Assert.Equal(["session-a", "session-b"], details.GetProperty("targetIds").EnumerateArray().Select(x => x.GetString()!).ToArray());
            Assert.Equal(["session-a", "session-b"], details.GetProperty("items").EnumerateArray().Select(x => x.GetProperty("targetId").GetString()!).ToArray());
            Assert.All(details.GetProperty("items").EnumerateArray(), item => Assert.Equal("Succeeded", item.GetProperty("state").GetString()));

            var replay = await client.PostAsJsonAsync("/api/v1/operations", request);
            var replayRecord = await replay.Content.ReadFromJsonAsync<JsonElement>();
            Assert.Equal(operationId, replayRecord.GetProperty("id").GetString());
            Assert.Equal(2, backend.SentTargets.Count);
        }
        finally
        {
            await app.StopAsync();
            Microsoft.Data.Sqlite.SqliteConnection.ClearAllPools();
            Directory.Delete(dir, true);
        }
    }

    [Fact]
    public async Task BroadcastStopsAfterKnownTargetFailureAndReportsPerItemResults()
    {
        var dir = Path.Combine(Path.GetTempPath(), Guid.NewGuid().ToString("N")); Directory.CreateDirectory(dir);
        var token = new string('E', 43);
        var options = new ServiceOptions { CredentialFile = Path.Combine(dir, "credentials.json"), DataDirectory = dir };
        File.WriteAllText(options.CredentialFile, JsonSerializer.Serialize(new[]
        {
            new ServiceCredential("p", ServiceOptions.HashToken(token), ["read", "write"], [])
        }));
        var backend = new Backend(failSecond: true);
        await using var app = ServiceHost.Build(options, backend, b => b.WebHost.UseTestServer());
        try
        {
            await app.StartAsync();
            using var client = app.GetTestClient();
            client.BaseAddress = new Uri("http://localhost:5088");
            client.DefaultRequestHeaders.Authorization = new AuthenticationHeaderValue("Bearer", token);
            var submitted = await client.PostAsJsonAsync("/api/v1/operations", new
            {
                kind = "broadcast-text", accountId = "account-1", targets = new[] { "session-a", "session-b", "session-c" },
                text = "broadcast-stop-test", idempotencyKey = "broadcast-stop-1", confirmed = true, stopOnError = true
            });
            var queued = await submitted.Content.ReadFromJsonAsync<JsonElement>();
            var completed = await WaitForTerminalAsync(client, queued.GetProperty("id").GetString()!);
            Assert.Equal("Failed", completed.GetProperty("state").GetString());
            Assert.Equal(["session-a"], backend.SentTargets);
            var details = JsonDocument.Parse(completed.GetProperty("details").GetString()!).RootElement;
            Assert.True(details.GetProperty("stopped").GetBoolean());
            Assert.Equal(2, details.GetProperty("items").GetArrayLength());
            Assert.Equal("Failed", details.GetProperty("items")[1].GetProperty("state").GetString());
            Assert.Equal("TargetUnavailable", details.GetProperty("items")[1].GetProperty("errorCode").GetString());
        }
        finally
        {
            await app.StopAsync();
            Microsoft.Data.Sqlite.SqliteConnection.ClearAllPools();
            Directory.Delete(dir, true);
        }
    }

    private static async Task<JsonElement> WaitForTerminalAsync(HttpClient client, string operationId)
    {
        for (var i = 0; i < 100; i++)
        {
            var response = await client.GetAsync($"/api/v1/operations/{operationId}");
            var record = await response.Content.ReadFromJsonAsync<JsonElement>();
            var state = record.GetProperty("state").GetString();
            if (state is "Succeeded" or "Failed" or "Unconfirmed" or "Cancelled" or "Expired") return record;
            await Task.Delay(10);
        }
        throw new TimeoutException("Broadcast operation did not reach a terminal state.");
    }
}