package handlers

import (
	"net/http"
	"strconv"

	"github.com/gin-gonic/gin"
	"github.com/imc-vibe/backend/internal/db"
)

type AliasHandler struct {
	db *db.DB
}

func NewAliasHandler(database *db.DB) *AliasHandler {
	return &AliasHandler{db: database}
}

type CreateAliasRequest struct {
	Source      string `json:"source" binding:"required"`
	Destination string `json:"destination" binding:"required"`
}

func (h *AliasHandler) List(c *gin.Context) {
	domainName := c.Param("name")
	if domainName == "" {
		Error(c, http.StatusBadRequest, "domain name required")
		return
	}

	authCtx := GetAuthContext(c)
	if authCtx == nil {
		Error(c, http.StatusUnauthorized, "authentication required")
		return
	}

	canAccess, _ := h.db.CanAccessDomain(authCtx.UserID, domainName, authCtx.IsAdmin())
	if !canAccess {
		Error(c, http.StatusForbidden, "access denied")
		return
	}

	domain, err := h.db.GetDomainByName(domainName)
	if err != nil {
		Error(c, http.StatusNotFound, "domain not found")
		return
	}

	aliases, err := h.db.GetAliasesByDomain(domain.ID)
	if err != nil {
		Error(c, http.StatusInternalServerError, "database error")
		return
	}

	Success(c, aliases)
}

func (h *AliasHandler) Create(c *gin.Context) {
	domainName := c.Param("name")
	if domainName == "" {
		Error(c, http.StatusBadRequest, "domain name required")
		return
	}

	authCtx := GetAuthContext(c)
	if authCtx == nil {
		Error(c, http.StatusUnauthorized, "authentication required")
		return
	}

	canAccess, _ := h.db.CanAccessDomain(authCtx.UserID, domainName, authCtx.IsAdmin())
	if !canAccess {
		Error(c, http.StatusForbidden, "access denied")
		return
	}

	domain, err := h.db.GetDomainByName(domainName)
	if err != nil {
		Error(c, http.StatusNotFound, "domain not found")
		return
	}

	var req CreateAliasRequest
	if err := c.ShouldBindJSON(&req); err != nil {
		Error(c, http.StatusBadRequest, "invalid request body")
		return
	}

	alias, err := h.db.CreateAliasInDomain(req.Source, req.Destination, domain.ID)
	if err != nil {
		Error(c, http.StatusInternalServerError, "failed to create alias")
		return
	}

	Created(c, alias)
}

func (h *AliasHandler) Delete(c *gin.Context) {
	domainName := c.Param("name")
	idStr := c.Param("id")

	if domainName == "" || idStr == "" {
		Error(c, http.StatusBadRequest, "domain name and alias id required")
		return
	}

	authCtx := GetAuthContext(c)
	if authCtx == nil {
		Error(c, http.StatusUnauthorized, "authentication required")
		return
	}

	canAccess, _ := h.db.CanAccessDomain(authCtx.UserID, domainName, authCtx.IsAdmin())
	if !canAccess {
		Error(c, http.StatusForbidden, "access denied")
		return
	}

	id, err := strconv.ParseUint(idStr, 10, 64)
	if err != nil {
		Error(c, http.StatusBadRequest, "invalid alias id")
		return
	}

	if err := h.db.DeleteAlias(uint(id)); err != nil {
		Error(c, http.StatusInternalServerError, "failed to delete alias")
		return
	}

	NoContent(c)
}