feat: init api

internal/router/handler/command.go

@@ -0,0 +1,47 @@
+package handler
+
+import (
+	"errors"
+	"net/http"
+
+	"github.com/iliadenisov/galaxy/internal/controller"
+	"github.com/iliadenisov/galaxy/internal/game"
+
+	"github.com/gin-gonic/gin"
+	"github.com/iliadenisov/galaxy/internal/model/rest"
+)
+
+type CommandExecutor func(controller.Config, rest.Command) error
+
+var (
+	ErrCommandNotProcessed = errors.New("command was not processed by executor")
+)
+
+func CommandHandler(c *gin.Context, config controller.Config, executor CommandExecutor) {
+	var cmd rest.Command
+	if err := c.ShouldBindJSON(&cmd); err != nil {
+		c.JSON(http.StatusBadRequest, gin.H{"error": err.Error()})
+		return
+	}
+	err := executor(config, cmd)
+	switch {
+	case err == nil:
+		c.Status(http.StatusOK)
+	case errors.Is(err, ErrCommandNotProcessed):
+		c.Status(http.StatusInternalServerError) // TODO: add error text?
+	default:
+		// TODO: separate invalid input and game state errors
+		c.JSON(http.StatusBadRequest, gin.H{"error": err.Error()})
+	}
+}
+
+func ExecuteCommand(config controller.Config, cmd rest.Command) error {
+	switch {
+	case cmd.DeclareWar != nil:
+		return game.DeclareWar(config, cmd.Race, cmd.DeclareWar.Opponent)
+	case cmd.DeclarePeace != nil:
+		return game.DeclarePeace(config, cmd.Race, cmd.DeclareWar.Opponent)
+	default:
+		return ErrCommandNotProcessed
+	}
+}