import UIKit

public enum RDEPUBFixedLayoutFit: String, Codable {
    case auto
    case page
    case width
}

public enum RDEPUBFixedLayoutSpreadMode: String, Codable {
    case automatic
    case always
    case never
}

public struct RDEPUBPresentationStyle: Equatable {

    public var viewportSize: CGSize

    public var contentInsets: UIEdgeInsets

    public var fontSize: CGFloat

    public var lineHeightMultiple: CGFloat

    public var numberOfColumns: Int

    public var columnGap: CGFloat

    public var themeBackgroundColor: String?

    public var themeTextColor: String?

    public init(
        viewportSize: CGSize,
        contentInsets: UIEdgeInsets,
        fontSize: CGFloat,
        lineHeightMultiple: CGFloat,
        numberOfColumns: Int = 1,
        columnGap: CGFloat = 20,
        themeBackgroundColor: String? = nil,
        themeTextColor: String? = nil
    ) {
        self.viewportSize = viewportSize
        self.contentInsets = contentInsets
        self.fontSize = fontSize
        self.lineHeightMultiple = lineHeightMultiple
        self.numberOfColumns = max(1, numberOfColumns)
        self.columnGap = max(0, columnGap)
        self.themeBackgroundColor = themeBackgroundColor
        self.themeTextColor = themeTextColor
    }
}

public struct RDEPUBReflowableRenderRequest: Equatable {

    public var spineIndex: Int

    public var href: String

    public var pageIndex: Int

    public var totalPagesInChapter: Int

    public var presentation: RDEPUBPresentationStyle

    public var targetLocation: RDEPUBLocation?

    public var targetHighlightRangeInfo: String?

    public var highlights: [RDEPUBHighlight]

    public var searchPresentation: RDEPUBSearchPresentation?

    public init(
        spineIndex: Int,
        href: String,
        pageIndex: Int,
        totalPagesInChapter: Int,
        presentation: RDEPUBPresentationStyle,
        targetLocation: RDEPUBLocation? = nil,
        targetHighlightRangeInfo: String? = nil,
        highlights: [RDEPUBHighlight] = [],
        searchPresentation: RDEPUBSearchPresentation? = nil
    ) {
        self.spineIndex = spineIndex
        self.href = href
        self.pageIndex = pageIndex
        self.totalPagesInChapter = totalPagesInChapter
        self.presentation = presentation
        self.targetLocation = targetLocation
        self.targetHighlightRangeInfo = targetHighlightRangeInfo
        self.highlights = highlights
        self.searchPresentation = searchPresentation
    }
}

public struct RDEPUBFixedRenderRequest: Equatable {

    public var spread: EPUBFixedSpread

    public var viewportSize: CGSize

    public var contentInset: UIEdgeInsets

    public var backgroundColorCSS: String?

    public var fit: RDEPUBFixedLayoutFit

    public var searchPresentation: RDEPUBSearchPresentation?

    public init(
        spread: EPUBFixedSpread,
        viewportSize: CGSize,
        contentInset: UIEdgeInsets,
        backgroundColorCSS: String? = nil,
        fit: RDEPUBFixedLayoutFit = .page,
        searchPresentation: RDEPUBSearchPresentation? = nil
    ) {
        self.spread = spread
        self.viewportSize = viewportSize
        self.contentInset = contentInset
        self.backgroundColorCSS = backgroundColorCSS
        self.fit = fit
        self.searchPresentation = searchPresentation
    }
}

public enum RDEPUBRenderRequest: Equatable {

    case reflowable(RDEPUBReflowableRenderRequest)

    case fixed(RDEPUBFixedRenderRequest)

    public var isFixedLayout: Bool {
        if case .fixed = self {
            return true
        }
        return false
    }

    public var primarySpineIndex: Int {
        switch self {
        case .reflowable(let request):
            return request.spineIndex
        case .fixed(let request):
            return request.spread.primaryResource.spineIndex
        }
    }

    public var primaryHref: String {
        switch self {
        case .reflowable(let request):
            return request.href
        case .fixed(let request):
            return request.spread.primaryResource.href
        }
    }
}