import Foundation

// 比价记录(「我的比价记录」)。对齐后端 schemas/compare_record.py。
// 金额两种口径:记录级 *_cents 是分(Int);逐平台 price / couponSaved 是元(Double)。
// 来自 raw JSON 列,字段可能不全 → 容错性字段一律 optional。

struct ComparisonResultItemDTO: Codable, Hashable {
    let platformId: String?
    let platformName: String?
    let `package`: String?         // 安卓包名,跳转用;Swift 关键字,反引号转义
    let price: Double?             // 元;失败/未知为 null
    let isSource: Bool?
    let rank: Int?
    let couponSaved: Double?       // 纯红包优惠额(元);没用/没抠到为 null
}

struct ComparisonItemDTO: Codable, Hashable {
    let name: String
    var qty: Int = 1
    let specs: [String]?

    enum CodingKeys: String, CodingKey { case name, qty, specs }

    init(from decoder: Decoder) throws {
        let c = try decoder.container(keyedBy: CodingKeys.self)
        name = try c.decode(String.self, forKey: .name)
        qty = (try? c.decode(Int.self, forKey: .qty)) ?? 1
        specs = try? c.decode([String].self, forKey: .specs)
    }
}

struct ComparisonRecordDTO: Codable, Identifiable, Hashable {
    let id: Int
    let businessType: String
    let traceId: String
    let sourcePlatformId: String?
    let sourcePlatformName: String?
    let sourcePackage: String?
    let sourcePriceCents: Int?
    let bestPlatformId: String?
    let bestPlatformName: String?
    let bestPriceCents: Int?
    let savedAmountCents: Int?
    let isSourceBest: Bool?
    let storeName: String?
    let totalDishCount: Int?
    let skippedDishCount: Int?
    let status: String
    let information: String?
    var items: [ComparisonItemDTO] = []
    var comparisonResults: [ComparisonResultItemDTO] = []
    var skippedDishNames: [String] = []
    let createdAt: String

    enum CodingKeys: String, CodingKey {
        case id, businessType, traceId, sourcePlatformId, sourcePlatformName, sourcePackage
        case sourcePriceCents, bestPlatformId, bestPlatformName, bestPriceCents, savedAmountCents
        case isSourceBest, storeName, totalDishCount, skippedDishCount, status, information
        case items, comparisonResults, skippedDishNames, createdAt
    }

    init(from decoder: Decoder) throws {
        let c = try decoder.container(keyedBy: CodingKeys.self)
        id = try c.decode(Int.self, forKey: .id)
        businessType = (try? c.decode(String.self, forKey: .businessType)) ?? "food"
        traceId = (try? c.decode(String.self, forKey: .traceId)) ?? ""
        sourcePlatformId = try? c.decode(String.self, forKey: .sourcePlatformId)
        sourcePlatformName = try? c.decode(String.self, forKey: .sourcePlatformName)
        sourcePackage = try? c.decode(String.self, forKey: .sourcePackage)
        sourcePriceCents = try? c.decode(Int.self, forKey: .sourcePriceCents)
        bestPlatformId = try? c.decode(String.self, forKey: .bestPlatformId)
        bestPlatformName = try? c.decode(String.self, forKey: .bestPlatformName)
        bestPriceCents = try? c.decode(Int.self, forKey: .bestPriceCents)
        savedAmountCents = try? c.decode(Int.self, forKey: .savedAmountCents)
        isSourceBest = try? c.decode(Bool.self, forKey: .isSourceBest)
        storeName = try? c.decode(String.self, forKey: .storeName)
        totalDishCount = try? c.decode(Int.self, forKey: .totalDishCount)
        skippedDishCount = try? c.decode(Int.self, forKey: .skippedDishCount)
        status = (try? c.decode(String.self, forKey: .status)) ?? "unknown"
        information = try? c.decode(String.self, forKey: .information)
        items = (try? c.decode([ComparisonItemDTO].self, forKey: .items)) ?? []
        comparisonResults = (try? c.decode([ComparisonResultItemDTO].self, forKey: .comparisonResults)) ?? []
        skippedDishNames = (try? c.decode([String].self, forKey: .skippedDishNames)) ?? []
        createdAt = (try? c.decode(String.self, forKey: .createdAt)) ?? ""
    }
}

struct ComparisonRecordPageDTO: Codable {
    let items: [ComparisonRecordDTO]
    let nextCursor: Int?
}