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/*
 * Copyright (c) 2020. JetBrains s.r.o.
 * Use of this source code is governed by the MIT license that can be found in the LICENSE file.
 */

package jetbrains.datalore.plot.base.geom

import jetbrains.datalore.base.geometry.DoubleRectangle
import jetbrains.datalore.base.geometry.DoubleVector
import jetbrains.datalore.plot.base.*
import jetbrains.datalore.plot.base.geom.util.BarTooltipHelper
import jetbrains.datalore.plot.base.geom.util.GeomUtil
import jetbrains.datalore.plot.base.geom.util.GeomUtil.widthPx
import jetbrains.datalore.plot.base.geom.util.HintColorUtil
import jetbrains.datalore.plot.base.geom.util.RectanglesHelper
import jetbrains.datalore.plot.base.render.SvgRoot
import jetbrains.datalore.plot.common.data.SeriesUtil

open class BarGeom : GeomBase() {

    override fun buildIntern(
        root: SvgRoot,
        aesthetics: Aesthetics,
        pos: PositionAdjustment,
        coord: CoordinateSystem,
        ctx: GeomContext
    ) {
        val helper = RectanglesHelper(aesthetics, pos, coord, ctx)
        val rectangles = helper.createRectangles(
            rectangleByDataPoint(ctx, isHintRect = false)
        )
        rectangles.reverse()
        rectangles.forEach { root.add(it) }

        BarTooltipHelper.collectRectangleTargets(
            emptyList(),
            aesthetics, pos, coord, ctx,
            rectangleByDataPoint(ctx, isHintRect = true),
            { HintColorUtil.fromFill(it) }
        )
    }

    companion object {
        const val HANDLES_GROUPS = false

        private fun rectangleByDataPoint(ctx: GeomContext, isHintRect: Boolean): (DataPointAesthetics) -> DoubleRectangle? {
            return { p ->
                val x = p.x()
                val y = p.y()
                val w = p.width()
                if (!SeriesUtil.allFinite(x, y, w)) {
                    null
                } else if (isHintRect) {
                    val width = widthPx(p, ctx, 2.0)
                    val origin = DoubleVector(x!! - width / 2, y!!)
                    val dimension = DoubleVector(width, 0.0)
                    DoubleRectangle(origin, dimension)
                } else {
                    GeomUtil.rectangleByDataPoint(p, ctx)
                }
            }
        }
    }
}