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/*
 * Copyright 2015 Creative Scala
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package doodle
package syntax

import cats.Traverse
import cats.instances.unit.*
import doodle.algebra.Algebra
import doodle.algebra.Layout
import doodle.algebra.Picture
import doodle.algebra.Shape

trait TraverseSyntax {
  implicit class TraverseOps[T[_], Alg <: Algebra](
      val t: T[Picture[Alg, Unit]]
  ) {
    import doodle.syntax.layout.*

    private val empty: Picture[Alg with Layout with Shape, Unit] =
      new Picture[Alg with Layout with Shape, Unit] {
        def apply(implicit
            algebra: Alg with Layout with Shape
        ): algebra.Drawing[Unit] =
          algebra.empty
      }

    def allOn(implicit
        traverse: Traverse[T]
    ): Picture[Alg with Layout with Shape, Unit] = {
      traverse.foldLeft(t, empty) { (accum, img) =>
        accum.on(img)
      }
    }

    def allBeside(implicit
        traverse: Traverse[T]
    ): Picture[Alg with Layout with Shape, Unit] = {
      traverse.foldLeft(t, empty) { (accum, img) =>
        accum.beside(img)
      }
    }

    def allAbove(implicit
        traverse: Traverse[T]
    ): Picture[Alg with Layout with Shape, Unit] = {
      traverse.foldLeft(t, empty) { (accum, img) =>
        accum.above(img)
      }
    }
  }
}