using System.Text.Json.Serialization;

namespace Gateway.Models;

/// <summary>
/// Configuration for a single advertising channel provider.
/// Populated from database (tbChannelConfig) via ChannelConfigService.
/// Drives Gateway routing, wizard behavior, and validation.
/// </summary>
public sealed class ProviderConfig
{
    /// <summary>Channel type key (e.g., "google_ads", "meta", "tiktok").</summary>
    public string ChannelType { get; set; } = "";

    /// <summary>Display name for UI.</summary>
    public string DisplayName { get; set; } = "";

    /// <summary>Short description shown in channel selection.</summary>
    public string? Description { get; set; }

    /// <summary>Whether this channel is currently available for new campaigns.</summary>
    public bool Enabled { get; set; }

    /// <summary>Provider service endpoint URL (null = stub/disabled).</summary>
    public string? Endpoint { get; set; }

    /// <summary>Internal API key for provider service authentication.</summary>
    public string? InternalKey { get; set; }

    /// <summary>Whether this is a stub container (test mode).</summary>
    public bool IsStub { get; set; }

    /// <summary>Minimum daily budget in USD for this channel.</summary>
    public decimal MinDailyBudget { get; set; }

    /// <summary>Minimum monthly budget in USD for this channel.</summary>
    public decimal MinMonthlyBudget { get; set; }

    /// <summary>Supported unified objectives (awareness, traffic, conversions, leads, sales).</summary>
    public List<string> SupportedObjectives { get; set; } = new();

    /// <summary>Supported creative formats (text, image, video, carousel, etc.).</summary>
    public List<string> SupportedCreativeFormats { get; set; } = new();

    /// <summary>Estimated approval time in hours.</summary>
    public int ApprovalEstimateHours { get; set; }

    /// <summary>How often to refresh metrics from this provider (minutes).</summary>
    public int MetricsRefreshIntervalMinutes { get; set; } = 60;

    /// <summary>Icon identifier for UI (e.g., "google", "meta", "tiktok").</summary>
    public string? Icon { get; set; }

    /// <summary>Brand color hex for UI (e.g., "#4285F4").</summary>
    public string? Color { get; set; }

    /// <summary>Auth method used by provider (oauth2, api_key, mcc).</summary>
    public string? AuthMethod { get; set; }

    /// <summary>Key Vault secret name for provider credentials.</summary>
    public string? KeyVaultSecretName { get; set; }

    /// <summary>
    /// Maps provider-specific status strings to platform statuses.
    /// Keys are raw provider values (case-insensitive), values are platform statuses
    /// (draft, staged, pending, active, paused, completed, cancelled, error).
    /// </summary>
    public Dictionary<string, string> StatusMappings { get; set; } = new(StringComparer.OrdinalIgnoreCase);
}

/// <summary>
/// Global allocation and multi-channel settings.
/// Loaded from appsettings.json "MultiChannel:Allocation" section (simple scalars only).
/// </summary>
public sealed class AllocationSettings
{
    public decimal MinMultiChannelMonthlyBudget { get; set; } = 500.00m;
    public int MaxChannelsPerInitiative { get; set; } = 5;
    public string DefaultAllocationStrategy { get; set; } = "template";
    public int PerformanceEvalIntervalDays { get; set; } = 7;
    public int PerformanceLookbackDays { get; set; } = 14;
    public int PerformanceLearningPeriodDays { get; set; } = 14;
    public decimal MaxAllocationShiftPct { get; set; } = 15.00m;
    public decimal MinChannelAllocationPct { get; set; } = 10.00m;
    public decimal MaxChannelAllocationPct { get; set; } = 80.00m;
}

/// <summary>
/// Root multi-channel configuration.
/// Channels are populated from DB via ChannelConfigService at startup.
/// Allocation settings loaded from appsettings.json (simple scalars).
/// </summary>
public sealed class MultiChannelConfig
{
    /// <summary>Per-provider configurations, keyed by channel type.</summary>
    public Dictionary<string, ProviderConfig> Channels { get; set; } = new();

    /// <summary>Global allocation settings.</summary>
    public AllocationSettings Allocation { get; set; } = new();

    /// <summary>Get only enabled providers.</summary>
    [JsonIgnore]
    public IEnumerable<ProviderConfig> EnabledChannels =>
        Channels.Values.Where(c => c.Enabled);

    /// <summary>Look up a provider config by channel type.</summary>
    public ProviderConfig? GetChannel(string channelType) =>
        Channels.TryGetValue(channelType, out var config) ? config : null;
}