import Foundation

struct FilterOption: Identifiable, Hashable {
    let id: String
    let name: String
    let value: String
}

enum FilterType: String, CaseIterable {
    case sort
    case genre
    case region
    case year

    var displayName: String {
        switch self {
        case .sort: return "排序"
        case .genre: return "类型"
        case .region: return "地区"
        case .year: return "年份"
        }
    }
}

struct FilterState {
    var sort: String = ""
    var genre: String = ""
    var region: String = ""
    var year: String = ""

    func buildPath(base: String) -> String {
        var path = base
        if !sort.isEmpty { path = "/\(sort)\(base)" }
        if !genre.isEmpty { path += "/genre/\(genre)" }
        if !region.isEmpty { path += "/region/\(region)" }
        if !year.isEmpty { path += "/year/\(year)" }
        return path
    }

    static let defaultSorts: [FilterOption] = [
        FilterOption(id: "sort_latest", name: "最新更新", value: ""),
        FilterOption(id: "sort_rating", name: "豆瓣评分", value: "rating"),
        FilterOption(id: "sort_popular", name: "近期热门", value: "popular"),
    ]

    static let defaultGenres: [FilterOption] = [
        FilterOption(id: "genre_all", name: "全部", value: ""),
        FilterOption(id: "genre_action", name: "动作", value: "action"),
        FilterOption(id: "genre_comedy", name: "喜剧", value: "comedy"),
        FilterOption(id: "genre_drama", name: "剧情", value: "drama"),
        FilterOption(id: "genre_scifi", name: "科幻", value: "scifi"),
        FilterOption(id: "genre_horror", name: "恐怖", value: "horror"),
        FilterOption(id: "genre_romance", name: "爱情", value: "romance"),
        FilterOption(id: "genre_thriller", name: "惊悚", value: "thriller"),
        FilterOption(id: "genre_suspense", name: "悬疑", value: "suspense"),
        FilterOption(id: "genre_adventure", name: "冒险", value: "adventure"),
        FilterOption(id: "genre_war", name: "战争", value: "war"),
        FilterOption(id: "genre_history", name: "历史", value: "history"),
        FilterOption(id: "genre_crime", name: "犯罪", value: "crime"),
        FilterOption(id: "genre_fantasy", name: "奇幻", value: "fantasy"),
        FilterOption(id: "genre_animation", name: "动画", value: "animation"),
        FilterOption(id: "genre_documentary", name: "纪录片", value: "documentary"),
        FilterOption(id: "genre_family", name: "家庭", value: "family"),
        FilterOption(id: "genre_music", name: "音乐", value: "music"),
        FilterOption(id: "genre_sport", name: "运动", value: "sport"),
        FilterOption(id: "genre_costume", name: "古装", value: "costume"),
        FilterOption(id: "genre_martial", name: "武侠", value: "martial"),
    ]

    static let defaultRegions: [FilterOption] = [
        FilterOption(id: "region_all", name: "全部", value: ""),
        FilterOption(id: "region_usa", name: "美国", value: "usa"),
        FilterOption(id: "region_uk", name: "英国", value: "uk"),
        FilterOption(id: "region_korea", name: "韩国", value: "korea"),
        FilterOption(id: "region_japan", name: "日本", value: "japan"),
        FilterOption(id: "region_china", name: "中国大陆", value: "china"),
        FilterOption(id: "region_hongkong", name: "中国香港", value: "hongkong"),
        FilterOption(id: "region_taiwan", name: "中国台湾", value: "taiwan"),
        FilterOption(id: "region_france", name: "法国", value: "france"),
        FilterOption(id: "region_germany", name: "德国", value: "germany"),
        FilterOption(id: "region_india", name: "印度", value: "india"),
        FilterOption(id: "region_thailand", name: "泰国", value: "thailand"),
    ]

    static let defaultYears: [FilterOption] = {
        var options = [FilterOption(id: "year_all", name: "全部", value: "")]
        let currentYear = Calendar.current.component(.year, from: Date())
        for year in stride(from: currentYear, through: 2018, by: -1) {
            options.append(FilterOption(id: "year_\(year)", name: "\(year)", value: "\(year)"))
        }
        return options
    }()
}