package site

import (
	"net/http"
	"regexp"

	"github.com/gin-gonic/gin"
)

var slugPattern = regexp.MustCompile(`^[a-z0-9]+(-[a-z0-9]+)*$`)

type Handler struct {
	service *Service
}

func NewHandler(service *Service) *Handler {
	return &Handler{service: service}
}

type settingsResponse struct {
	Name        string `json:"name"`
	Description string `json:"description"`
	Slug        string `json:"slug"`
}

func toResponse(s *Settings) settingsResponse {
	return settingsResponse{Name: s.Name, Description: s.Description, Slug: s.Slug}
}

func (h *Handler) Get(c *gin.Context) {
	settings, err := h.service.Get(c.Request.Context())
	if err != nil {
		c.JSON(http.StatusInternalServerError, gin.H{"error": "failed to load site settings"})
		return
	}
	c.JSON(http.StatusOK, toResponse(settings))
}

type updateRequest struct {
	Name        string `json:"name" binding:"required"`
	Description string `json:"description"`
	Slug        string `json:"slug" binding:"required"`
}

func (h *Handler) Update(c *gin.Context) {
	var req updateRequest
	if err := c.ShouldBindJSON(&req); err != nil {
		c.JSON(http.StatusBadRequest, gin.H{"error": "validation error", "details": err.Error()})
		return
	}
	if !slugPattern.MatchString(req.Slug) {
		c.JSON(http.StatusBadRequest, gin.H{"error": "slug must be lowercase letters, digits and hyphens only"})
		return
	}

	settings, err := h.service.Update(c.Request.Context(), req.Name, req.Description, req.Slug)
	if err != nil {
		c.JSON(http.StatusInternalServerError, gin.H{"error": "failed to update site settings"})
		return
	}
	c.JSON(http.StatusOK, toResponse(settings))
}