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@file:Suppress("OverridingDeprecatedMember")

package io.data2viz.viz

import io.data2viz.color.ColorOrGradient


/**
 * Holds the styling property.
 */
interface Style {
    var fill: ColorOrGradient?
    var stroke: ColorOrGradient?
    var strokeWidth: Double?
    var textColor: ColorOrGradient?


    @Deprecated("Use hAlign", ReplaceWith("hAlign"))
    var anchor: TextHAlign
    var hAlign: TextHAlign

    @Deprecated("Use vAlign", ReplaceWith("vAlign"))
    var baseline: TextVAlign
    var vAlign: TextVAlign
}

internal class StyleImpl: Style {
    override var fill: ColorOrGradient? = null
    override var stroke: ColorOrGradient? = null
    override var textColor: ColorOrGradient? = null
    override var strokeWidth: Double? = 1.0
    override var hAlign: TextHAlign = TextHAlign.LEFT
    override var anchor: TextHAlign = hAlign
    override var vAlign: TextVAlign = TextVAlign.BASELINE
    override var baseline: TextVAlign = vAlign
}

class HierarchicalStyle(var parent:Style?): Style {
    private var style:Style? = null

    private var fillSet = false
    override var fill: ColorOrGradient?
        get() = if (fillSet) style!!.fill else parent?.fill
        set(value) {
            if (style == null)
                style = StyleImpl()
            fillSet = true
            style?.fill = value
        }

    private var strokeSet = false
    override var stroke: ColorOrGradient?
        get() = if (strokeSet) style!!.stroke else parent?.stroke
        set(value) {
            if (style == null)
                style = StyleImpl()
            strokeSet = true
            style?.stroke = value
        }

    private var strokeWidthSet = false
    override var strokeWidth: Double?
        get() = if (strokeWidthSet) style?.strokeWidth else parent?.strokeWidth
        set(value) {
            if (style == null)
                style = StyleImpl()
            strokeWidthSet = true
            style?.strokeWidth = value
        }

    private var textColorSet = false
    override var textColor: ColorOrGradient?
        get() = if (textColorSet) style?.textColor else parent?.textColor
        set(value) {
            if (style == null)
                style = StyleImpl()
            textColorSet = true
            style?.textColor = value
        }


    private var hAlignSet = false
    override var hAlign: TextHAlign
        get() = if (hAlignSet) style?.hAlign!! else parent?.hAlign!!
        set(value) {
            if (style == null)
                style = StyleImpl()
            hAlignSet = true
            style?.hAlign = value
        }
    override var anchor: TextHAlign
        get() = hAlign
        set(value) {
            hAlign = value
        }

    private var vAlignSet = false
    override var vAlign: TextVAlign
        get() = if (vAlignSet) style?.vAlign!! else parent?.vAlign!!
        set(value) {
            if (style == null)
                style = StyleImpl()
            vAlignSet = true
            style?.vAlign = value
        }
    @Deprecated("Use vAlign", ReplaceWith("vAlign"))
    override var baseline: TextVAlign
        get() = vAlign
        set(value) {
            vAlign = value
        }

}

/**
 * The text-anchor attribute is used to horizontally align ([LEFT], [MIDDLE] or [RIGHT]-alignment) a string of
 * text relative to a given point.
 * See [CSS text-anchor][https://developer.mozilla.org/en-US/docs/Web/SVG/Attribute/text-anchor]
 */
enum class TextHAlign {
    LEFT,
    @Deprecated("Use LEFT", ReplaceWith("LEFT"))
    START,
    MIDDLE,
    RIGHT,
    @Deprecated("Use RIGHT", ReplaceWith("RIGHT"))
    END
}

@Deprecated("Use TextHAlign", ReplaceWith("TextHAlign"))
typealias TextAnchor = TextHAlign

/**
 * Vertical alignment of a text
 */
enum class TextVAlign {
    HANGING,
    MIDDLE,
    BASELINE
}

@Deprecated("Use TextVAlign", ReplaceWith("TextVAlign"))
typealias TextAlignmentBaseline = TextVAlign