import Foundation

public enum RDEPUBLayout: String, Codable {
    case reflowable
    case fixed
}

public enum RDEPUBReadingProfile: String, Codable {
    case webInteractive
    case webFixedLayout
    case textReflowable
}

public enum RDEPUBReadingProgression: String, Codable {
    case ltr
    case rtl
    case auto
}

public enum RDEPUBPageSpread: String, Codable {
    case left
    case right
    case center
}

/// EPUB 渲染朝向（rendition:orientation / iBooks display-options）。
public enum RDEPUBOrientation: String, Codable {
    case portrait
    case landscape
    case auto
}

public struct RDEPUBMetadata: Codable, Equatable {

    public var identifier: String?

    public var title: String

    public var author: String?

    public var language: String?

    public var version: String?

    public var layout: RDEPUBLayout

    public var spread: String?

    public var readingProgression: RDEPUBReadingProgression

    /// 渲染朝向；nil = 未声明（不锁定，跟随系统）。
    /// 来源优先级：OPF rendition:orientation > META-INF/com.apple.ibooks.display-options.xml。
    public var orientation: RDEPUBOrientation?

    public init(
        identifier: String? = nil,
        title: String = "",
        author: String? = nil,
        language: String? = nil,
        version: String? = nil,
        layout: RDEPUBLayout = .reflowable,
        spread: String? = nil,
        readingProgression: RDEPUBReadingProgression = .auto,
        orientation: RDEPUBOrientation? = nil
    ) {
        self.identifier = identifier
        self.title = title
        self.author = author
        self.language = language
        self.version = version
        self.layout = layout
        self.spread = spread
        self.readingProgression = readingProgression
        self.orientation = orientation
    }
}

public struct RDEPUBManifestItem: Codable, Equatable {

    public var id: String

    public var href: String

    public var mediaType: String

    public var properties: [String]

    public var fallback: String?

    public var mediaOverlay: String?

    public var title: String?

    public init(
        id: String,
        href: String,
        mediaType: String,
        properties: [String] = [],
        fallback: String? = nil,
        mediaOverlay: String? = nil,
        title: String? = nil
    ) {
        self.id = id
        self.href = href
        self.mediaType = mediaType
        self.properties = properties
        self.fallback = fallback
        self.mediaOverlay = mediaOverlay
        self.title = title
    }

    public var isNavigationDocument: Bool {
        properties.contains("nav")
    }

    public var isNCX: Bool {
        mediaType == "application/x-dtbncx+xml"
    }
}

public struct RDEPUBSpineItem: Codable, Equatable {

    public var idref: String

    public var href: String

    public var mediaType: String

    public var title: String

    public var linear: Bool

    public var properties: [String]

    public var pageSpread: RDEPUBPageSpread?

    public var layout: RDEPUBLayout?

    public init(
        idref: String,
        href: String,
        mediaType: String,
        title: String,
        linear: Bool = true,
        properties: [String] = [],
        pageSpread: RDEPUBPageSpread? = nil,
        layout: RDEPUBLayout? = nil
    ) {
        self.idref = idref
        self.href = href
        self.mediaType = mediaType
        self.title = title
        self.linear = linear
        self.properties = properties
        self.pageSpread = pageSpread
        self.layout = layout
    }
}

public struct EPUBTableOfContentsItem: Codable, Equatable {

    public var title: String

    public var href: String

    public var children: [EPUBTableOfContentsItem]

    public init(title: String, href: String, children: [EPUBTableOfContentsItem] = []) {
        self.title = title
        self.href = href
        self.children = children
    }
}

public enum RDEPUBParserError: LocalizedError {

    case archiveOpenFailed(URL)

    case missingContainerXML

    case missingRootFile

    case invalidRootFilePath(String)

    case invalidXML(URL)

    case missingManifestItem(idref: String)

    case emptySpine

    case invalidArchiveEntryPath(String)

    public var errorDescription: String? {
        switch self {
        case .archiveOpenFailed(let url):
            return "无法打开 EPUB 压缩包: \(url.lastPathComponent)"
        case .missingContainerXML:
            return "EPUB 缺少 META-INF/container.xml"
        case .missingRootFile:
            return "container.xml 中未找到 rootfile"
        case .invalidRootFilePath(let path):
            return "OPF 路径无效: \(path)"
        case .invalidXML(let url):
            return "XML 解析失败: \(url.lastPathComponent)"
        case .missingManifestItem(let idref):
            return "spine itemref 找不到对应 manifest 项: \(idref)"
        case .emptySpine:
            return "OPF spine 为空"
        case .invalidArchiveEntryPath(let path):
            return "归档条目路径非法: \(path)"
        }
    }
}