using System.Text.Json.Serialization;

namespace MetaApi.Models;

#region Campaign Payloads

/// <summary>
/// Create a Meta campaign.
/// Meta hierarchy: Campaign → Ad Set → Ad
/// With Advantage+ (v25.0+), this uses the unified campaign API.
/// </summary>
public sealed class CreateCampaignPayload
{
    public string Name { get; set; } = string.Empty;
    public MetaObjective Objective { get; set; } = MetaObjective.Conversions;

    /// <summary>
    /// Campaign spending limit in account currency (in cents).
    /// Null = no campaign spending limit.
    /// </summary>
    public long? SpendCapCents { get; set; }

    /// <summary>
    /// Special ad categories required by Meta for housing, employment, credit, etc.
    /// Empty = none (most campaigns).
    /// </summary>
    public List<string> SpecialAdCategories { get; set; } = new();

    public MetaCampaignStatus Status { get; set; } = MetaCampaignStatus.Paused;
}

public sealed class GetCampaignPayload
{
    public string CampaignId { get; set; } = string.Empty;
}

public sealed class UpdateCampaignPayload
{
    public string CampaignId { get; set; } = string.Empty;
    public string? Name { get; set; }
    public MetaCampaignStatus? Status { get; set; }
    public long? SpendCapCents { get; set; }
}

public sealed class ListCampaignsPayload
{
    public MetaCampaignStatus? StatusFilter { get; set; }
    public int Limit { get; set; } = 50;
    public string? After { get; set; }  // Cursor-based pagination
}

#endregion

#region Ad Set Payloads

/// <summary>
/// Create a Meta Ad Set (equivalent to Google Ad Group).
/// Ad Sets define targeting, budget, schedule, and bid strategy.
/// </summary>
public sealed class CreateAdSetPayload
{
    public string CampaignId { get; set; } = string.Empty;
    public string Name { get; set; } = string.Empty;

    /// <summary>Daily budget in account currency cents.</summary>
    public long DailyBudgetCents { get; set; }

    /// <summary>Lifetime budget in cents (alternative to daily). Null = use daily.</summary>
    public long? LifetimeBudgetCents { get; set; }

    public string? StartTime { get; set; }  // ISO 8601
    public string? EndTime { get; set; }    // ISO 8601

    public MetaBillingEvent BillingEvent { get; set; } = MetaBillingEvent.Impressions;
    public MetaOptimizationGoal OptimizationGoal { get; set; } = MetaOptimizationGoal.LinkClicks;

    /// <summary>Target CPA bid amount in cents (for CPA bidding).</summary>
    public long? BidAmountCents { get; set; }

    public MetaCampaignStatus Status { get; set; } = MetaCampaignStatus.Paused;
}

#endregion

#region Ad Account Payloads

/// <summary>
/// Create a new ad account under USIM's Business Manager.
/// Requires Advanced Access to business_management permission.
/// </summary>
public sealed class CreateAdAccountPayload
{
    /// <summary>Display name for the new ad account.</summary>
    public string Name { get; set; } = string.Empty;

    /// <summary>Currency code (e.g. "USD"). ISO 4217.</summary>
    public string Currency { get; set; } = "USD";

    /// <summary>Timezone (IANA format, e.g. "America/Los_Angeles"). Numeric TZ ID also accepted.</summary>
    public int TimezoneId { get; set; } = 1;  // Default: America/Los_Angeles

    /// <summary>End advertiser name/business for the account.</summary>
    public string? EndAdvertiser { get; set; }

    /// <summary>Media agency managing the account.</summary>
    public string? MediaAgency { get; set; }

    /// <summary>Partner (USIM).</summary>
    public string? Partner { get; set; }
}

#endregion

#region Insights Payloads

/// <summary>
/// Retrieve campaign performance metrics (Meta Insights API).
/// </summary>
public sealed class CampaignInsightsPayload
{
    public string CampaignId { get; set; } = string.Empty;
    public string? DatePreset { get; set; }  // e.g., "last_7d", "last_30d", "this_month"
    public string? StartDate { get; set; }   // YYYY-MM-DD (time_range)
    public string? EndDate { get; set; }     // YYYY-MM-DD (time_range)
    public string Level { get; set; } = "campaign";  // campaign, adset, ad
}

public sealed class AccountInsightsPayload
{
    public string? DatePreset { get; set; }
    public string? StartDate { get; set; }
    public string? EndDate { get; set; }
}

#endregion

#region Enums

/// <summary>
/// Meta campaign objectives.
/// As of API v25.0, Meta is consolidating to Outcome-Driven Ad Experiences (ODAX).
/// These map to the Advantage+ unified campaign objectives.
/// </summary>
[JsonConverter(typeof(JsonStringEnumConverter))]
public enum MetaObjective
{
    /// <summary>OUTCOME_AWARENESS - Brand awareness and reach</summary>
    Awareness = 0,

    /// <summary>OUTCOME_TRAFFIC - Drive traffic to a destination</summary>
    Traffic = 1,

    /// <summary>OUTCOME_ENGAGEMENT - Get more engagement (likes, comments, shares)</summary>
    Engagement = 2,

    /// <summary>OUTCOME_LEADS - Generate leads</summary>
    Leads = 3,

    /// <summary>OUTCOME_APP_PROMOTION - Drive app installs</summary>
    AppPromotion = 4,

    /// <summary>OUTCOME_SALES - Drive conversions/sales</summary>
    Conversions = 5
}

/// <summary>
/// Meta campaign/ad set status values.
/// </summary>
[JsonConverter(typeof(JsonStringEnumConverter))]
public enum MetaCampaignStatus
{
    Active = 0,
    Paused = 1,
    Deleted = 2,
    Archived = 3
}

/// <summary>
/// Meta billing events for ad sets.
/// </summary>
[JsonConverter(typeof(JsonStringEnumConverter))]
public enum MetaBillingEvent
{
    Impressions = 0,
    LinkClicks = 1,
    ThruPlay = 2
}

/// <summary>
/// Meta optimization goals for ad sets.
/// </summary>
[JsonConverter(typeof(JsonStringEnumConverter))]
public enum MetaOptimizationGoal
{
    None = 0,
    LinkClicks = 1,
    Impressions = 2,
    Reach = 3,
    LandingPageViews = 4,
    LeadGeneration = 5,
    Conversions = 6,
    Value = 7
}

#endregion