using Distribution.Models;

namespace Distribution.Features.Scheme;

// ── Rule config payloads for percentage-based rules (serialized into Scheme.RuleConfig) ──

public record SlabDiscountConfig(List<SlabTier> Tiers);

public record SlabTier(decimal MinOrderAmount, decimal DiscountPercent);

public record FlatPercentConfig(decimal DiscountPercent);

// ── Requests ────────────────────────────────────────────────────────────

public record BundleComponentRequest(Guid ItemId, int Qty);

/// <summary>
/// TriggerItemId/TriggerQty/FreeItemId/FreeQty/BundleComponents are optional so plain discount
/// schemes (SlabDiscount/FlatPercent) can omit them entirely. When RuleType is BuyXGetY, supplying
/// TriggerItemId+TriggerQty+FreeItemId+FreeQty here creates the scheme fully populated in one call
/// instead of a separate PUT .../free-goods-rule. When RuleType is FreeBundle, supplying
/// FreeItemId+FreeQty+BundleComponents does the same. These can still be added/edited later via
/// PUT .../free-goods-rule and PUT .../bundle-components/{itemId}.
/// </summary>
public record CreateSchemeRequest(
    string Name,
    SchemeRuleType RuleType,
    string? RuleConfig,
    Guid? RegionId,
    string? EligibleSegment,
    DateTime DateRangeFrom,
    DateTime DateRangeTo,
    bool AgentLimitExempt,
    decimal? BaselineExpectedSales,
    Guid? TriggerItemId = null,
    int? TriggerQty = null,
    Guid? FreeItemId = null,
    decimal? FreeQty = null,
    List<BundleComponentRequest>? BundleComponents = null);

public record UpdateSchemeRequest(
    string Name,
    string? RuleConfig,
    Guid? RegionId,
    string? EligibleSegment,
    DateTime DateRangeFrom,
    DateTime DateRangeTo,
    bool AgentLimitExempt,
    decimal? BaselineExpectedSales,
    bool IsActive);

public record ApplySchemeRequest(Guid SchemeId);

/// <summary>
/// Sets the free-goods payout for a scheme. For BuyXGetY, TriggerItemId/TriggerQty are required
/// (what the store must buy); for FreeBundle they are ignored — the required items instead come
/// from the scheme's bundle-components CRUD. FreeItemId/FreeQty is the payout in both cases.
/// </summary>
public record SetFreeGoodsRuleRequest(Guid? TriggerItemId, int? TriggerQty, Guid FreeItemId, decimal FreeQty);

public record UpsertBundleComponentRequest(int Qty);

// ── Responses ───────────────────────────────────────────────────────────

public record BundleComponentResponse(Guid ItemId, string Sku, string ItemName, int Qty);

public record SchemeResponse(
    Guid Id,
    string Name,
    SchemeRuleType RuleType,
    string? RuleConfig,
    Guid? TriggerItemId,
    string? TriggerItemName,
    int? TriggerQty,
    Guid? FreeItemId,
    string? FreeItemName,
    decimal? FreeQty,
    List<BundleComponentResponse> BundleComponents,
    Guid? RegionId,
    string? RegionName,
    string? EligibleSegment,
    DateTime DateRangeFrom,
    DateTime DateRangeTo,
    bool AgentLimitExempt,
    decimal? BaselineExpectedSales,
    bool IsActive,
    DateTime CreatedAt);

public record SchemeEligibilityResponse(
    Guid SchemeId,
    string SchemeName,
    SchemeRuleType RuleType,
    bool Eligible,
    string? Reason,
    decimal? DiscountAmount,
    Guid? FreeItemId,
    decimal? FreeQty,
    string? FreeItemName = null);

/// <summary>A cart line for scheme suggestion before the Shop PO exists. UnitPrice null = resolve from the price list.</summary>
public record SuggestLine(Guid ItemId, int Quantity, decimal? UnitPrice = null, bool IsFree = false);

public record SuggestSchemesRequest(Guid StoreId, List<SuggestLine> Items);

public record SchemeRedemptionResponse(
    Guid Id,
    Guid SchemeId,
    Guid? ShopPOId,
    decimal? DiscountAmount,
    Guid? FreeItemId,
    string? FreeItemName,
    decimal? FreeQty,
    decimal? FreeItemCostValue,
    DateTime RedeemedAt);

public record SchemeSpendResponse(Guid SchemeId, decimal TotalDiscountSpend, decimal TotalFreeGoodsCostSpend, decimal TotalSpend, int RedemptionCount);

public record SchemeROIResponse(Guid SchemeId, decimal BaselineExpectedSales, decimal ActualSales, decimal IncrementalSales, decimal TotalSpend, decimal? ROI);