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

namespace WxAgent.Service.Tests;

public sealed class ServiceBoundaryTests
{
    private sealed class Backend : IAgentBackend
    {
        public IReadOnlyList<AgentCapability> Capabilities =>
        [
            new("agent-status", true, true, true, false, false, "read", false, 30, null, []),
            new("accounts-list", true, true, true, false, false, "read", false, 30, null, []),
            new("sessions-list", true, true, true, true, false, "read", false, 30, null, []),
            new("messages-read", true, true, true, true, false, "read", false, 30, null, []),
            new("contacts-list", true, true, true, false, false, "read", false, 30, null, []),
            new("send-text", true, false, false, true, true, "write", false, 30, "Write validation is pending.", [])
        ];
        public Task<object> StatusAsync(CancellationToken ct) => Task.FromResult<object>(new { ok = true });
        public Task<IReadOnlyList<AccountInfo>> AccountsAsync(CancellationToken ct) => Task.FromResult<IReadOnlyList<AccountInfo>>([new("account-1", null, null, null, "fingerprint", false)]);
    }

    [Fact]
    public void DatabaseSyncIsAuthorizedByAgentConnectionByDefault()
    {
        var options = new ServiceOptions
        {
            CredentialFile = Path.Combine(Path.GetTempPath(), Guid.NewGuid().ToString("N")),
            DataDirectory = Path.GetTempPath()
        };
        Assert.True(options.EnableDataSync);
    }

    [Fact]
    public async Task StaticUiAndBoundedReadOnlyPagesAreRealProductionRoutes()
    {
        var dir = Path.Combine(Path.GetTempPath(), Guid.NewGuid().ToString("N")); Directory.CreateDirectory(dir);
        var token = new string('A', 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"], []) }));
        await using var app = ServiceHost.Build(options, new Backend(), b => b.WebHost.UseTestServer());
        try
        {
            await app.StartAsync(); using var client = app.GetTestClient(); client.BaseAddress = new Uri("http://localhost:5088");
            var page = await client.GetAsync("/"); Assert.Equal(HttpStatusCode.OK, page.StatusCode); Assert.Contains("WxAgent", await page.Content.ReadAsStringAsync());
            Assert.True(page.Headers.Contains("X-Content-Type-Options")); Assert.True(page.Headers.Contains("Content-Security-Policy"));
            client.DefaultRequestHeaders.Authorization = new AuthenticationHeaderValue("Bearer", token);
            var accounts = await client.GetFromJsonAsync<JsonElement>("/api/v1/accounts?limit=1&offset=0");
            Assert.Equal(1, accounts.GetProperty("items").GetArrayLength()); Assert.False(accounts.GetProperty("hasMore").GetBoolean());
            Assert.Equal(HttpStatusCode.BadRequest, (await client.GetAsync("/api/v1/accounts?limit=201")).StatusCode);
            Assert.Equal(HttpStatusCode.BadRequest, (await client.GetAsync("/api/v1/accounts?offset=-1")).StatusCode);
            Assert.Equal(HttpStatusCode.BadRequest, (await client.GetAsync("/api/v1/status?token=leak")).StatusCode);
        }
        finally { await app.StopAsync(); Microsoft.Data.Sqlite.SqliteConnection.ClearAllPools(); Directory.Delete(dir, true); }
    }

    [Fact]
    public void CredentialFilesAcceptTrayStyleCamelCaseJson()
    {
        var dir = Path.Combine(Path.GetTempPath(), Guid.NewGuid().ToString("N")); Directory.CreateDirectory(dir);
        try
        {
            var token = new string('C', 43);
            var options = new ServiceOptions { CredentialFile = Path.Combine(dir, "credentials.json"), DataDirectory = dir };
            File.WriteAllText(options.CredentialFile, JsonSerializer.Serialize(new[]
            {
                new { principalId = "tray", tokenSha256 = ServiceOptions.HashToken(token), permissions = new[] { "read" }, accountIds = Array.Empty<string>() }
            }));
            var credentials = options.ReadCredentials();
            Assert.Single(credentials);
            Assert.Equal("tray", credentials[0].PrincipalId);
        }
        finally { Directory.Delete(dir, true); }
    }

    [Fact]
    public void CustomAccessCredentialsHaveNoLengthLimit()
    {
        var dir = Path.Combine(Path.GetTempPath(), Guid.NewGuid().ToString("N")); Directory.CreateDirectory(dir);
        try
        {
            var token = "x";
            var options = new ServiceOptions
            {
                AccessToken = token,
                CredentialFile = Path.Combine(dir, "credentials.json"),
                DataDirectory = dir
            };
            File.WriteAllText(options.CredentialFile, JsonSerializer.Serialize(new[]
            {
                new ServiceCredential("custom", ServiceOptions.HashToken(token), ["read"], [])
            }));
            options.Validate();
            Assert.Equal("custom", new ServiceSecurity(options).AuthenticateToken(token)?.PrincipalId);
        }
        finally { Directory.Delete(dir, true); }
    }

    [Fact]
    public void EmbeddedRemoteConfigurationIsValidatedWithTheService()
    {
        var dir = Path.Combine(Path.GetTempPath(), Guid.NewGuid().ToString("N")); Directory.CreateDirectory(dir);
        try
        {
            var options = new ServiceOptions
            {
                CredentialFile = Path.Combine(dir, "credentials.json"),
                DataDirectory = dir,
                Remote = new RemoteAgentOptions
                {
                    AuthAddress = "http://10.1.1.104:8090",
                    Token = "node-token",
                    NodeId = "node-1",
                    AllowInsecureHttp = true
                }
            };
            File.WriteAllText(options.CredentialFile, JsonSerializer.Serialize(new[]
            {
                new ServiceCredential("tray", ServiceOptions.HashToken("local-token"), ["read"], [])
            }));
            options.Validate();
            var invalid = new ServiceOptions
            {
                CredentialFile = options.CredentialFile,
                DataDirectory = options.DataDirectory,
                Remote = options.Remote! with { AllowInsecureHttp = false }
            };
            Assert.Throws<ArgumentException>(() => invalid.Validate());
        }
        finally { Directory.Delete(dir, true); }
    }

    [Fact]
    public void RuntimeLogWritesFullOperationalMessagesToTheRequestedPath()
    {
        var dir = Path.Combine(Path.GetTempPath(), Guid.NewGuid().ToString("N")); Directory.CreateDirectory(dir);
        try
        {
            var path = Path.Combine(dir, "wxagent.log");
            RuntimeLog.Append(path, Microsoft.Extensions.Logging.LogLevel.Information, "test", "full diagnostic message");
            var log = File.ReadAllText(path);
            Assert.Contains("full diagnostic message", log);
            Assert.Contains("[Information] test", log);
        }
        finally { Directory.Delete(dir, true); }
    }

    [Fact]
    public async Task OperationListIsPrincipalScopedAndSupportsCallerAccountFiltering()
    {
        var dir = Path.Combine(Path.GetTempPath(), Guid.NewGuid().ToString("N")); Directory.CreateDirectory(dir);
        var token = new string('A', 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"], []) }));
        await using var app = ServiceHost.Build(options, new Backend(), b => b.WebHost.UseTestServer());
        try
        {
            await app.StartAsync(); using var client = app.GetTestClient(); client.BaseAddress = new Uri("http://localhost:5088");
            var store = app.Services.GetRequiredService<OperationStore>();
            var first = store.Enqueue("p", "account-1", "read-demo", "key-1", "digest-1", false, TimeSpan.FromMinutes(1), 100).Record;
            store.Transition(first.Id, "Succeeded", "complete");
            var second = store.Enqueue("p", "account-2", "read-demo", "key-2", "digest-2", false, TimeSpan.FromMinutes(1), 100).Record;
            store.Transition(second.Id, "Succeeded", "complete");
            var other = store.Enqueue("other", "account-1", "read-demo", "key-3", "digest-3", false, TimeSpan.FromMinutes(1), 100).Record;
            store.Transition(other.Id, "Succeeded", "complete");
            client.DefaultRequestHeaders.Authorization = new AuthenticationHeaderValue("Bearer", token);

            var all = await client.GetFromJsonAsync<JsonElement>("/api/v1/operations?limit=1");
            Assert.Single(all.GetProperty("items").EnumerateArray());
            Assert.True(all.GetProperty("hasMore").GetBoolean());
            Assert.DoesNotContain("principalId", all.GetProperty("items")[0].EnumerateObject().Select(p => p.Name), StringComparer.OrdinalIgnoreCase);

            var filtered = await client.GetFromJsonAsync<JsonElement>("/api/v1/operations?accountId=account-2&limit=50");
            Assert.Single(filtered.GetProperty("items").EnumerateArray());
            Assert.Equal("account-2", filtered.GetProperty("items")[0].GetProperty("accountId").GetString());
        }
        finally { await app.StopAsync(); Microsoft.Data.Sqlite.SqliteConnection.ClearAllPools(); Directory.Delete(dir, true); }
    }

    [Fact]
    public async Task DisabledTextSendDoesNotCreateAnOperation()
    {
        var dir = Path.Combine(Path.GetTempPath(), Guid.NewGuid().ToString("N")); Directory.CreateDirectory(dir);
        var token = new string('B', 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"], []) }));
        await using var app = ServiceHost.Build(options, new 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 response = await client.PostAsJsonAsync("/api/v1/operations", new
            {
                kind = "send-text", accountId = "account-1", targetId = "session-1", text = "test",
                idempotencyKey = "send-1", confirmed = true
            });
            Assert.Equal(HttpStatusCode.Conflict, response.StatusCode);
            Assert.Equal("CapabilityDisabled", (await response.Content.ReadFromJsonAsync<JsonElement>()).GetProperty("error").GetProperty("code").GetString());
        }
        finally { await app.StopAsync(); Microsoft.Data.Sqlite.SqliteConnection.ClearAllPools(); Directory.Delete(dir, true); }
    }

    [Fact]
    public void LoopbackRequestsCanUseLocalIdentityWithoutToken()
    {
        var options = new ServiceOptions { CredentialFile = Path.Combine(Path.GetTempPath(), Guid.NewGuid().ToString("N")), DataDirectory = Path.GetTempPath() };
        var security = new ServiceSecurity(options);
        var local = new DefaultHttpContext();
        local.Request.Method = HttpMethods.Get;
        local.Connection.RemoteIpAddress = IPAddress.Loopback;
        var identity = security.AuthenticateRequest(local);
        Assert.True(identity.LocalOnly);
        Assert.True(identity.Allows("manage"));
        var remote = new DefaultHttpContext();
        remote.Connection.RemoteIpAddress = IPAddress.Parse("192.0.2.1");
        Assert.Throws<ServiceException>(() => security.AuthenticateRequest(remote));
    }

    [Fact]
    public void ExternalBindingRequiresExplicitOptIn()
    {
        var dir = Path.Combine(Path.GetTempPath(), Guid.NewGuid().ToString("N")); Directory.CreateDirectory(dir);
        var options = new ServiceOptions { ListenUrl = "http://192.0.2.10:5088", CredentialFile = Path.Combine(dir, "credentials.json"), DataDirectory = dir };
        File.WriteAllText(options.CredentialFile, "[]");
        try { Assert.Throws<ArgumentException>(() => options.Validate()); }
        finally { Directory.Delete(dir, true); }
    }

    [Fact]
    public void MultipleTokensAreRejected()
    {
        var dir = Path.Combine(Path.GetTempPath(), Guid.NewGuid().ToString("N")); Directory.CreateDirectory(dir);
        var options = new ServiceOptions { CredentialFile = Path.Combine(dir, "credentials.json"), DataDirectory = dir };
        File.WriteAllText(options.CredentialFile, JsonSerializer.Serialize(new[]
        {
            new ServiceCredential("one", new string('A', 64), ["read"], []),
            new ServiceCredential("two", new string('B', 64), ["read"], [])
        }));
        try { Assert.Throws<InvalidDataException>(() => options.ReadCredentials()); }
        finally { Directory.Delete(dir, true); }
    }
}