using System.Net;
using System.Net.Http.Headers;
using System.Net.Http.Json;
using System.Text.Json;
using Dapper;
using Microsoft.Data.SqlClient;
using SIGCM2.TestSupport;

namespace SIGCM2.Api.Tests.Admin;

/// <summary>
/// ADM-001 B6 — Integration tests for /api/v1/admin/medios.
/// All endpoints require permission 'administracion:medios:gestionar'.
/// </summary>
[Collection("ApiIntegration")]
public sealed class MediosControllerTests : IAsyncLifetime
{
    private const string TestConnectionString = TestConnectionStrings.ApiTestDb;

    private const string Endpoint = "/api/v1/admin/medios";
    private const string AdminUsername = "admin";
    private const string AdminPassword = "@Diego550@";

    private readonly HttpClient _client;

    public MediosControllerTests(TestWebAppFactory factory)
    {
        _client = factory.CreateClient();
    }

    public Task InitializeAsync() => Task.CompletedTask;
    public Task DisposeAsync() => Task.CompletedTask;

    // ── Helpers ──────────────────────────────────────────────────────────────

    private async Task<string> GetAdminTokenAsync()
    {
        var response = await _client.PostAsJsonAsync("/api/v1/auth/login", new
        {
            username = AdminUsername,
            password = AdminPassword
        });
        response.EnsureSuccessStatusCode();
        var json = await response.Content.ReadFromJsonAsync<JsonElement>();
        return json.GetProperty("accessToken").GetString()!;
    }

    private async Task<string> GetCajeroTokenAsync(string username)
    {
        var adminToken = await GetAdminTokenAsync();

        using var mkUser = BuildRequest(HttpMethod.Post, "/api/v1/users", new
        {
            username,
            password = "Secure1234!",
            nombre = "Cajero",
            apellido = "Test",
            email = (string?)null,
            rol = "cajero"
        }, adminToken);
        var mkResp = await _client.SendAsync(mkUser);
        if (mkResp.StatusCode != HttpStatusCode.Created && mkResp.StatusCode != HttpStatusCode.Conflict)
            Assert.Fail($"Seed cajero failed: {mkResp.StatusCode}");

        var loginResp = await _client.PostAsJsonAsync("/api/v1/auth/login", new
        {
            username,
            password = "Secure1234!"
        });
        loginResp.EnsureSuccessStatusCode();
        var loginJson = await loginResp.Content.ReadFromJsonAsync<JsonElement>();
        return loginJson.GetProperty("accessToken").GetString()!;
    }

    private HttpRequestMessage BuildRequest(HttpMethod method, string url, object? body = null, string? bearerToken = null)
    {
        var request = new HttpRequestMessage(method, url);
        if (bearerToken is not null)
            request.Headers.Authorization = new AuthenticationHeaderValue("Bearer", bearerToken);
        if (body is not null)
            request.Content = JsonContent.Create(body);
        return request;
    }

    private static async Task DeleteMedioIfExistsAsync(string codigo)
    {
        await using var conn = new SqlConnection(TestConnectionString);
        await conn.OpenAsync();

        var id = await conn.QuerySingleOrDefaultAsync<int?>(
            "SELECT Id FROM dbo.Medio WHERE Codigo = @Codigo", new { Codigo = codigo });
        if (id is null) return;

        // Delete dependent secciones first (disable versioning to also clear history)
        await conn.ExecuteAsync("ALTER TABLE dbo.Seccion SET (SYSTEM_VERSIONING = OFF)");
        await conn.ExecuteAsync("DELETE FROM dbo.Seccion_History WHERE MedioId = @id", new { id });
        await conn.ExecuteAsync("DELETE FROM dbo.Seccion WHERE MedioId = @id", new { id });
        await conn.ExecuteAsync(
            "ALTER TABLE dbo.Seccion SET (SYSTEM_VERSIONING = ON (HISTORY_TABLE = dbo.Seccion_History, HISTORY_RETENTION_PERIOD = 10 YEARS))");

        // Delete the medio itself
        await conn.ExecuteAsync("ALTER TABLE dbo.Medio SET (SYSTEM_VERSIONING = OFF)");
        await conn.ExecuteAsync("DELETE FROM dbo.Medio_History WHERE Id = @id", new { id });
        await conn.ExecuteAsync("DELETE FROM dbo.Medio WHERE Id = @id", new { id });
        await conn.ExecuteAsync(
            "ALTER TABLE dbo.Medio SET (SYSTEM_VERSIONING = ON (HISTORY_TABLE = dbo.Medio_History, HISTORY_RETENTION_PERIOD = 10 YEARS))");
    }

    private static async Task DeleteUsuarioIfExistsAsync(string username)
    {
        await using var conn = new SqlConnection(TestConnectionString);
        await conn.OpenAsync();
        await conn.ExecuteAsync("""
            DELETE rt FROM dbo.RefreshToken rt
            INNER JOIN dbo.Usuario u ON u.Id = rt.UsuarioId
            WHERE u.Username = @Username
            """, new { Username = username });
        await conn.ExecuteAsync("DELETE FROM dbo.Usuario WHERE Username = @Username", new { Username = username });
    }

    private static async Task<int> CountAuditEventsAsync(string action, string targetType, string targetId)
    {
        await using var conn = new SqlConnection(TestConnectionString);
        await conn.OpenAsync();
        return await conn.QuerySingleAsync<int>(
            "SELECT COUNT(*) FROM dbo.AuditEvent WHERE Action = @Action AND TargetType = @TargetType AND TargetId = @TargetId",
            new { Action = action, TargetType = targetType, TargetId = targetId });
    }

    // ── 401 / 403 guards ─────────────────────────────────────────────────────

    [Fact]
    public async Task CreateMedio_WithoutAuth_Returns401()
    {
        using var req = BuildRequest(HttpMethod.Post, Endpoint, new
        {
            codigo = "TESTMEDIO401",
            nombre = "Test Medio",
            tipo = 1
        });
        var resp = await _client.SendAsync(req);
        Assert.Equal(HttpStatusCode.Unauthorized, resp.StatusCode);
    }

    [Fact]
    public async Task CreateMedio_WithCajeroRole_Returns403()
    {
        const string username = "adm001_medio_cajero_403";
        try
        {
            var token = await GetCajeroTokenAsync(username);
            using var req = BuildRequest(HttpMethod.Post, Endpoint, new
            {
                codigo = "TESTMEDIO403",
                nombre = "Test Medio",
                tipo = 1
            }, token);
            var resp = await _client.SendAsync(req);
            Assert.Equal(HttpStatusCode.Forbidden, resp.StatusCode);
        }
        finally
        {
            await DeleteUsuarioIfExistsAsync(username);
        }
    }

    // ── CREATE ────────────────────────────────────────────────────────────────

    [Fact]
    public async Task CreateMedio_WithAdmin_Returns201AndAuditEvent()
    {
        const string codigo = "TESTCREATE201";
        var token = await GetAdminTokenAsync();

        try
        {
            using var req = BuildRequest(HttpMethod.Post, Endpoint, new
            {
                codigo,
                nombre = "Test Create 201",
                tipo = 1
            }, token);
            var resp = await _client.SendAsync(req);

            Assert.Equal(HttpStatusCode.Created, resp.StatusCode);
            Assert.NotNull(resp.Headers.Location);

            var json = await resp.Content.ReadFromJsonAsync<JsonElement>();
            Assert.True(json.TryGetProperty("id", out var id));
            Assert.True(id.GetInt32() > 0);
            Assert.True(json.TryGetProperty("codigo", out var codigoEl));
            Assert.Equal(codigo, codigoEl.GetString());
            Assert.True(json.TryGetProperty("activo", out var activo));
            Assert.True(activo.GetBoolean());

            // Verify AuditEvent was created
            var medioId = id.GetInt32().ToString();
            var auditCount = await CountAuditEventsAsync("medio.create", "Medio", medioId);
            Assert.Equal(1, auditCount);
        }
        finally
        {
            await DeleteMedioIfExistsAsync(codigo);
        }
    }

    [Fact]
    public async Task CreateMedio_DuplicateCodigo_Returns409()
    {
        const string codigo = "TESTDUPLICATE";
        var token = await GetAdminTokenAsync();

        try
        {
            // First create
            using var first = BuildRequest(HttpMethod.Post, Endpoint, new
            {
                codigo,
                nombre = "Primer Medio",
                tipo = 1
            }, token);
            var firstResp = await _client.SendAsync(first);
            Assert.Equal(HttpStatusCode.Created, firstResp.StatusCode);

            // Second create with same codigo
            using var second = BuildRequest(HttpMethod.Post, Endpoint, new
            {
                codigo,
                nombre = "Segundo Medio",
                tipo = 2
            }, token);
            var secondResp = await _client.SendAsync(second);

            Assert.Equal(HttpStatusCode.Conflict, secondResp.StatusCode);
            var json = await secondResp.Content.ReadFromJsonAsync<JsonElement>();
            Assert.True(json.TryGetProperty("error", out var error));
            Assert.Equal("medio_codigo_duplicado", error.GetString());
        }
        finally
        {
            await DeleteMedioIfExistsAsync(codigo);
        }
    }

    // ── LIST ─────────────────────────────────────────────────────────────────

    [Fact]
    public async Task GetMedios_WithAdmin_Returns200WithSeedRows()
    {
        var token = await GetAdminTokenAsync();
        using var req = BuildRequest(HttpMethod.Get, $"{Endpoint}?activo=true", bearerToken: token);
        var resp = await _client.SendAsync(req);

        Assert.Equal(HttpStatusCode.OK, resp.StatusCode);
        var json = await resp.Content.ReadFromJsonAsync<JsonElement>();
        Assert.True(json.TryGetProperty("items", out var items), "Response must have 'items'");
        Assert.True(json.TryGetProperty("total", out _), "Response must have 'total'");

        // The seed includes ELDIA and ELPLATA
        var codigosInResponse = items.EnumerateArray()
            .Select(i => i.GetProperty("codigo").GetString())
            .ToList();
        Assert.Contains("ELDIA", codigosInResponse);
        Assert.Contains("ELPLATA", codigosInResponse);
    }

    // ── GET BY ID ────────────────────────────────────────────────────────────

    [Fact]
    public async Task GetMedioById_NotFound_Returns404()
    {
        var token = await GetAdminTokenAsync();
        using var req = BuildRequest(HttpMethod.Get, $"{Endpoint}/999999", bearerToken: token);
        var resp = await _client.SendAsync(req);

        Assert.Equal(HttpStatusCode.NotFound, resp.StatusCode);
        var json = await resp.Content.ReadFromJsonAsync<JsonElement>();
        Assert.True(json.TryGetProperty("error", out var error));
        Assert.Equal("medio_not_found", error.GetString());
    }

    // ── UPDATE ────────────────────────────────────────────────────────────────

    [Fact]
    public async Task UpdateMedio_WithAdmin_Returns200AndAuditEventAndHistory()
    {
        const string codigo = "TESTUPDATEMEDIO";
        var token = await GetAdminTokenAsync();

        try
        {
            // Create
            using var createReq = BuildRequest(HttpMethod.Post, Endpoint, new
            {
                codigo,
                nombre = "Medio Original",
                tipo = 1
            }, token);
            var createResp = await _client.SendAsync(createReq);
            Assert.Equal(HttpStatusCode.Created, createResp.StatusCode);
            var created = await createResp.Content.ReadFromJsonAsync<JsonElement>();
            var medioId = created.GetProperty("id").GetInt32();

            // Update
            using var updateReq = BuildRequest(HttpMethod.Put, $"{Endpoint}/{medioId}", new
            {
                nombre = "Medio Actualizado",
                tipo = 2
            }, token);
            var updateResp = await _client.SendAsync(updateReq);

            Assert.Equal(HttpStatusCode.OK, updateResp.StatusCode);
            var updated = await updateResp.Content.ReadFromJsonAsync<JsonElement>();
            Assert.Equal("Medio Actualizado", updated.GetProperty("nombre").GetString());

            // Verify AuditEvent
            var auditCount = await CountAuditEventsAsync("medio.update", "Medio", medioId.ToString());
            Assert.Equal(1, auditCount);

            // Verify Medio_History row exists
            await using var conn = new SqlConnection(TestConnectionString);
            await conn.OpenAsync();
            var histCount = await conn.QuerySingleAsync<int>(
                "SELECT COUNT(*) FROM dbo.Medio_History WHERE Id = @Id",
                new { Id = medioId });
            Assert.True(histCount >= 1, "Should have at least one row in Medio_History after update");
        }
        finally
        {
            await DeleteMedioIfExistsAsync(codigo);
        }
    }

    // ── DEACTIVATE ────────────────────────────────────────────────────────────

    [Fact]
    public async Task DeactivateMedio_WithAdmin_Returns204AndAuditEvent()
    {
        const string codigo = "TESTDEACTIVATE";
        var token = await GetAdminTokenAsync();

        try
        {
            // Create
            using var createReq = BuildRequest(HttpMethod.Post, Endpoint, new
            {
                codigo,
                nombre = "Medio Para Desactivar",
                tipo = 1
            }, token);
            var createResp = await _client.SendAsync(createReq);
            Assert.Equal(HttpStatusCode.Created, createResp.StatusCode);
            var created = await createResp.Content.ReadFromJsonAsync<JsonElement>();
            var medioId = created.GetProperty("id").GetInt32();

            // Deactivate
            using var deactReq = BuildRequest(HttpMethod.Post, $"{Endpoint}/{medioId}/deactivate", bearerToken: token);
            var deactResp = await _client.SendAsync(deactReq);

            Assert.Equal(HttpStatusCode.NoContent, deactResp.StatusCode);

            // Verify AuditEvent
            var auditCount = await CountAuditEventsAsync("medio.deactivate", "Medio", medioId.ToString());
            Assert.Equal(1, auditCount);
        }
        finally
        {
            await DeleteMedioIfExistsAsync(codigo);
        }
    }

    [Fact]
    public async Task DeactivateMedio_WhenAlreadyInactive_Returns204ButNoNewAuditEvent()
    {
        const string codigo = "TESTDEACTIVATEIDEMPOTENT";
        var token = await GetAdminTokenAsync();

        try
        {
            // Create
            using var createReq = BuildRequest(HttpMethod.Post, Endpoint, new
            {
                codigo,
                nombre = "Medio Idempotente",
                tipo = 1
            }, token);
            var createResp = await _client.SendAsync(createReq);
            Assert.Equal(HttpStatusCode.Created, createResp.StatusCode);
            var created = await createResp.Content.ReadFromJsonAsync<JsonElement>();
            var medioId = created.GetProperty("id").GetInt32();

            // First deactivate
            using var deact1 = BuildRequest(HttpMethod.Post, $"{Endpoint}/{medioId}/deactivate", bearerToken: token);
            await _client.SendAsync(deact1);

            // Second deactivate (idempotent)
            using var deact2 = BuildRequest(HttpMethod.Post, $"{Endpoint}/{medioId}/deactivate", bearerToken: token);
            var deact2Resp = await _client.SendAsync(deact2);

            Assert.Equal(HttpStatusCode.NoContent, deact2Resp.StatusCode);

            // Should still be only 1 audit event (second call was idempotent — no new audit)
            var auditCount = await CountAuditEventsAsync("medio.deactivate", "Medio", medioId.ToString());
            Assert.Equal(1, auditCount);
        }
        finally
        {
            await DeleteMedioIfExistsAsync(codigo);
        }
    }
}