package controller

import (
	"errors"
	"net/http"

	"github.com/google/uuid"
	"github.com/labstack/echo/v4"
	"gitrepo.ru/neonxp/nquest/api"
	"gitrepo.ru/neonxp/nquest/pkg/contextlib"
	"gitrepo.ru/neonxp/nquest/pkg/models"
	"gitrepo.ru/neonxp/nquest/pkg/service"
)

type Engine struct {
	GameService   *service.Game
	EngineService *service.Engine
}

// (GET /engine/{uid})
func (ec *Engine) GameEngine(c echo.Context, uid uuid.UUID) error {
	user := contextlib.GetUser(c)

	game, err := ec.GameService.GetByID(c.Request().Context(), uid)
	if err != nil {
		return err
	}

	cursor, err := ec.EngineService.GetState(c.Request().Context(), game, user)
	if err != nil {
		return err
	}

	return c.JSON(http.StatusOK, mapCursorToTask(cursor, nil))
}

// (POST /engine/{uid}/code)
func (ec *Engine) EnterCode(c echo.Context, uid uuid.UUID) error {
	user := contextlib.GetUser(c)

	ctx := c.Request().Context()

	game, err := ec.GameService.GetByID(ctx, uid)
	if err != nil {
		return err
	}

	req := &api.EnterCodeJSONRequestBody{}
	if err := c.Bind(req); err != nil {
		return err
	}

	cursor, err := ec.EngineService.EnterCode(ctx, game, user, req.Code)
	message := api.OkCode
	if err != nil {
		switch {
		case errors.Is(err, service.ErrGameFinished):
			message = api.GameComplete
		case errors.Is(err, service.ErrInvalidCode):
			message = api.InvalidCode
		case errors.Is(err, service.ErrOldCode):
			message = api.OldCode
		case errors.Is(err, service.ErrNextLevel):
			message = api.NextLevel
		default:
			return c.JSON(http.StatusBadRequest, &api.ErrorResponse{
				Code:    http.StatusBadRequest,
				Message: err.Error(),
			})
		}
	}

	return c.JSON(http.StatusOK, mapCursorToTask(cursor, &message))
}

func mapCursorToTask(cursor *models.GameCursor, message *api.TaskViewMessage) *api.TaskView {
	resp := &api.TaskResponse{
		Message: message,
		Codes:   make([]api.CodeView, 0, len(cursor.Task.Codes)),
		// Solutions: []api.SolutionView{},
		Text:  cursor.Task.Text,
		Title: cursor.Task.Title,
	}
	for _, code := range cursor.Task.Codes {
		c := api.CodeView{
			Description: code.Description,
		}
		for _, cd := range cursor.Codes {
			if cd.ID == code.ID {
				c.Code = &cd.Code
				break
			}
		}
		resp.Codes = append(resp.Codes, c)
	}

	return resp
}