using System.Text.Json;
using System.Text.Json.Serialization;

namespace MetaApi.Models;

/// <summary>
/// Request from Gateway to MetaApi.
/// Identical contract to GoogleApi.Models.ProviderRequest for Gateway compatibility.
/// </summary>
public sealed class ProviderRequest
{
    /// <summary>
    /// Operation to execute (e.g., "Ping", "CreateCampaign", "GetCampaignInsights")
    /// </summary>
    public string Operation { get; set; } = string.Empty;

    /// <summary>
    /// Tenant/account ID - maps to Meta ad account ID (act_XXXXXXX).
    /// Populated by Gateway from tbAdAccount.accExternalAccountId where accNetwork='meta'.
    /// </summary>
    public string? TenantId { get; set; }

    /// <summary>
    /// Login customer ID - maps to Meta Business Manager ID.
    /// In Meta's agency model, the BM owns and manages client ad accounts.
    /// Populated by Gateway from tbAdAccount.accLoginAccountId.
    /// </summary>
    public string? LoginCustomerId { get; set; }

    /// <summary>
    /// Correlation ID for request tracing
    /// </summary>
    public string? RequestId { get; set; }

    /// <summary>
    /// Operation-specific payload
    /// </summary>
    public JsonElement? Payload { get; set; }

    /// <summary>
    /// Deserialize payload to strongly-typed object
    /// </summary>
    public T GetPayload<T>() where T : new()
    {
        if (Payload == null || Payload.Value.ValueKind == JsonValueKind.Null || Payload.Value.ValueKind == JsonValueKind.Undefined)
            return new T();

        try
        {
            return JsonSerializer.Deserialize<T>(Payload.Value.GetRawText(), JsonOptions.Default) ?? new T();
        }
        catch
        {
            return new T();
        }
    }
}

/// <summary>
/// Response from MetaApi to Gateway.
/// Identical contract to GoogleApi.Models.ProviderResponse.
/// </summary>
public sealed class ProviderResponse
{
    public bool Ok { get; set; }
    public string? RequestId { get; set; }
    public object? Data { get; set; }
    public ProviderError? Error { get; set; }

    public static ProviderResponse Success(string? requestId, object? data = null)
        => new() { Ok = true, RequestId = requestId, Data = data };

    public static ProviderResponse Fail(string? requestId, string code, string message, object? detail = null)
        => new()
        {
            Ok = false,
            RequestId = requestId,
            Error = new ProviderError { Code = code, Message = message, Detail = detail }
        };
}

public sealed class ProviderError
{
    public string Code { get; set; } = "ERROR";
    public string Message { get; set; } = "Unknown error";
    public object? Detail { get; set; }
}

internal static class JsonOptions
{
    public static readonly JsonSerializerOptions Default = new(JsonSerializerDefaults.Web)
    {
        PropertyNamingPolicy = JsonNamingPolicy.CamelCase,
        DefaultIgnoreCondition = JsonIgnoreCondition.WhenWritingNull
    };
}