import UIKit

public enum RDEPUBTextRenderingEngine: Equatable {
    case dtCoreText
}

public struct RDEPUBReaderConfiguration: Equatable {
    public var fontSize: CGFloat
    public var lineHeightMultiple: CGFloat
    public var displayType: RDReaderView.DisplayType
    public var landscapeDualPageEnabled: Bool
    public var showsTableOfContents: Bool
    public var allowsHighlights: Bool
    public var showsSettingsPanel: Bool
    public var reflowableContentInsets: UIEdgeInsets
    public var fixedContentInset: UIEdgeInsets
    public var theme: RDEPUBReaderTheme
    public var fixedLayoutFit: RDEPUBFixedLayoutFit
    public var fixedLayoutSpreadMode: RDEPUBFixedLayoutSpreadMode
    public var textRenderingEngine: RDEPUBTextRenderingEngine

    public init(
        fontSize: CGFloat = 15,
        lineHeightMultiple: CGFloat = 1.6,
        displayType: RDReaderView.DisplayType = .pageCurl,
        landscapeDualPageEnabled: Bool = true,
        showsTableOfContents: Bool = true,
        allowsHighlights: Bool = true,
        showsSettingsPanel: Bool = true,
        reflowableContentInsets: UIEdgeInsets = UIEdgeInsets(top: 40, left: 16, bottom: 40, right: 16),
        fixedContentInset: UIEdgeInsets = .zero,
        theme: RDEPUBReaderTheme = .light,
        fixedLayoutFit: RDEPUBFixedLayoutFit = .page,
        fixedLayoutSpreadMode: RDEPUBFixedLayoutSpreadMode = .automatic,
        textRenderingEngine: RDEPUBTextRenderingEngine = .dtCoreText
    ) {
        self.fontSize = fontSize
        self.lineHeightMultiple = lineHeightMultiple
        self.displayType = displayType
        self.landscapeDualPageEnabled = landscapeDualPageEnabled
        self.showsTableOfContents = showsTableOfContents
        self.allowsHighlights = allowsHighlights
        self.showsSettingsPanel = showsSettingsPanel
        self.reflowableContentInsets = reflowableContentInsets
        self.fixedContentInset = fixedContentInset
        self.theme = theme
        self.fixedLayoutFit = fixedLayoutFit
        self.fixedLayoutSpreadMode = fixedLayoutSpreadMode
        self.textRenderingEngine = textRenderingEngine
    }

    public static let `default` = RDEPUBReaderConfiguration()
}

extension RDEPUBReaderConfiguration {
    func makePreferences() -> RDEPUBPreferences {
        RDEPUBPreferences(
            fontSize: fontSize,
            lineHeightMultiple: lineHeightMultiple,
            reflowableContentInsets: reflowableContentInsets,
            fixedContentInset: fixedContentInset,
            themeBackgroundColor: theme.themeBackgroundColorCSS,
            themeTextColor: theme.themeTextColorCSS,
            fixedBackgroundColor: theme.themeBackgroundColorCSS,
            fixedLayoutFit: fixedLayoutFit,
            fixedLayoutSpreadMode: fixedLayoutSpreadMode
        )
    }
}