hexmap/server/action/map.go

package action

import (
	"go.uber.org/zap/zapcore"
	"hexmap-server/state"
)

// CellColor is the action sent when a cell of the map has been colored a different color.
type CellColor struct {
	// At is the location of the cell in storage coordinates.
	At state.StorageCoordinates `json:"at"`
	// Color is the color the cell has been changed to.
	Color state.HexColor `json:"color"`
}

func (c CellColor) MarshalLogObject(encoder zapcore.ObjectEncoder) error {
	err := encoder.AddObject("at", c.At)
	encoder.AddString("color", c.Color.String())
	return err
}

// Apply sets the target cell's color, or returns ErrNoOp if it can't.
func (c CellColor) Apply(s *state.Synced) error {
	if c.Color.A < 0xF {
		return ErrNoTransparentColors
	}
	cell, err := s.Map.LineCells.GetCellAt(c.At)
	if err != nil {
		return err
	}
	if cell.Color == c.Color {
		return ErrNoOp
	}
	cell.Color = c.Color
	return nil
}