package handlers

import (
	"encoding/json"
	"net/http"

	"gitea.hostxtra.co.uk/mrhid6/notely/backend/internal/application/dto"
	"gitea.hostxtra.co.uk/mrhid6/notely/backend/internal/application/services"
	"gitea.hostxtra.co.uk/mrhid6/notely/backend/internal/interfaces/middleware"
	"github.com/gorilla/mux"
	"go.mongodb.org/mongo-driver/v2/bson"
)

// SpaceHandler handles space endpoints
type SpaceHandler struct {
	spaceService *services.SpaceService
}

// NewSpaceHandler creates a new space handler
func NewSpaceHandler(spaceService *services.SpaceService) *SpaceHandler {
	return &SpaceHandler{
		spaceService: spaceService,
	}
}

// CreateSpace creates a new space
func (h *SpaceHandler) CreateSpace(w http.ResponseWriter, r *http.Request) {
	if r.Method != http.MethodPost {
		http.Error(w, "Method not allowed", http.StatusMethodNotAllowed)
		return
	}

	userID, err := middleware.GetUserIDFromContext(r.Context())
	if err != nil {
		http.Error(w, "Unauthorized", http.StatusUnauthorized)
		return
	}

	var req dto.CreateSpaceRequest
	if err := json.NewDecoder(r.Body).Decode(&req); err != nil {
		http.Error(w, "Invalid request body", http.StatusBadRequest)
		return
	}

	userObjID, _ := bson.ObjectIDFromHex(userID)
	space, err := h.spaceService.CreateSpace(r.Context(), userObjID, &req)
	if err != nil {
		http.Error(w, err.Error(), http.StatusBadRequest)
		return
	}

	w.Header().Set("Content-Type", "application/json")
	w.WriteHeader(http.StatusCreated)
	json.NewEncoder(w).Encode(space)
}

// GetUserSpaces retrieves all spaces for the user
func (h *SpaceHandler) GetUserSpaces(w http.ResponseWriter, r *http.Request) {
	if r.Method != http.MethodGet {
		http.Error(w, "Method not allowed", http.StatusMethodNotAllowed)
		return
	}

	userID, err := middleware.GetUserIDFromContext(r.Context())
	if err != nil {
		http.Error(w, "Unauthorized", http.StatusUnauthorized)
		return
	}

	userObjID, _ := bson.ObjectIDFromHex(userID)
	spaces, err := h.spaceService.GetUserSpaces(r.Context(), userObjID)
	if err != nil {
		http.Error(w, err.Error(), http.StatusBadRequest)
		return
	}

	w.Header().Set("Content-Type", "application/json")
	json.NewEncoder(w).Encode(spaces)
}

// GetSpace retrieves a space
func (h *SpaceHandler) GetSpace(w http.ResponseWriter, r *http.Request) {
	if r.Method != http.MethodGet {
		http.Error(w, "Method not allowed", http.StatusMethodNotAllowed)
		return
	}

	spaceID := mux.Vars(r)["spaceId"]
	userID, err := middleware.GetUserIDFromContext(r.Context())
	if err != nil {
		http.Error(w, "Unauthorized", http.StatusUnauthorized)
		return
	}

	spaceObjID, _ := bson.ObjectIDFromHex(spaceID)
	userObjID, _ := bson.ObjectIDFromHex(userID)

	space, err := h.spaceService.GetSpaceByID(r.Context(), spaceObjID, userObjID)
	if err != nil {
		http.Error(w, err.Error(), http.StatusNotFound)
		return
	}

	w.Header().Set("Content-Type", "application/json")
	json.NewEncoder(w).Encode(space)
}

// UpdateSpace updates a space
func (h *SpaceHandler) UpdateSpace(w http.ResponseWriter, r *http.Request) {
	if r.Method != http.MethodPut {
		http.Error(w, "Method not allowed", http.StatusMethodNotAllowed)
		return
	}

	spaceID := mux.Vars(r)["spaceId"]
	userID, err := middleware.GetUserIDFromContext(r.Context())
	if err != nil {
		http.Error(w, "Unauthorized", http.StatusUnauthorized)
		return
	}

	var req dto.CreateSpaceRequest
	if err := json.NewDecoder(r.Body).Decode(&req); err != nil {
		http.Error(w, "Invalid request body", http.StatusBadRequest)
		return
	}

	spaceObjID, _ := bson.ObjectIDFromHex(spaceID)
	userObjID, _ := bson.ObjectIDFromHex(userID)

	space, err := h.spaceService.UpdateSpace(r.Context(), spaceObjID, userObjID, &req)
	if err != nil {
		http.Error(w, err.Error(), http.StatusBadRequest)
		return
	}

	w.Header().Set("Content-Type", "application/json")
	json.NewEncoder(w).Encode(space)
}

// DeleteSpace deletes a space
func (h *SpaceHandler) DeleteSpace(w http.ResponseWriter, r *http.Request) {
	if r.Method != http.MethodDelete {
		http.Error(w, "Method not allowed", http.StatusMethodNotAllowed)
		return
	}

	spaceID := mux.Vars(r)["spaceId"]
	userID, err := middleware.GetUserIDFromContext(r.Context())
	if err != nil {
		http.Error(w, "Unauthorized", http.StatusUnauthorized)
		return
	}

	spaceObjID, _ := bson.ObjectIDFromHex(spaceID)
	userObjID, _ := bson.ObjectIDFromHex(userID)

	if err := h.spaceService.DeleteSpace(r.Context(), spaceObjID, userObjID); err != nil {
		http.Error(w, err.Error(), http.StatusBadRequest)
		return
	}

	w.WriteHeader(http.StatusNoContent)
}

// GetSpaceMembers retrieves all members in a space (owner only)
func (h *SpaceHandler) GetSpaceMembers(w http.ResponseWriter, r *http.Request) {
	if r.Method != http.MethodGet {
		http.Error(w, "Method not allowed", http.StatusMethodNotAllowed)
		return
	}

	spaceID := mux.Vars(r)["spaceId"]
	userID, err := middleware.GetUserIDFromContext(r.Context())
	if err != nil {
		http.Error(w, "Unauthorized", http.StatusUnauthorized)
		return
	}

	spaceObjID, _ := bson.ObjectIDFromHex(spaceID)
	userObjID, _ := bson.ObjectIDFromHex(userID)

	members, err := h.spaceService.GetSpaceMembers(r.Context(), spaceObjID, userObjID)
	if err != nil {
		http.Error(w, err.Error(), http.StatusBadRequest)
		return
	}

	w.Header().Set("Content-Type", "application/json")
	json.NewEncoder(w).Encode(map[string]interface{}{"members": members})
}

// AddMember adds a member to a space (owner/editor)
func (h *SpaceHandler) AddMember(w http.ResponseWriter, r *http.Request) {
	if r.Method != http.MethodPost {
		http.Error(w, "Method not allowed", http.StatusMethodNotAllowed)
		return
	}

	spaceID := mux.Vars(r)["spaceId"]
	userID, err := middleware.GetUserIDFromContext(r.Context())
	if err != nil {
		http.Error(w, "Unauthorized", http.StatusUnauthorized)
		return
	}

	var req dto.AddSpaceMemberRequest
	if err := json.NewDecoder(r.Body).Decode(&req); err != nil {
		http.Error(w, "Invalid request body", http.StatusBadRequest)
		return
	}

	spaceObjID, _ := bson.ObjectIDFromHex(spaceID)
	userObjID, _ := bson.ObjectIDFromHex(userID)
	targetUserObjID, err := bson.ObjectIDFromHex(req.UserID)
	if err != nil {
		http.Error(w, "Invalid user id", http.StatusBadRequest)
		return
	}

	if err := h.spaceService.AddMember(r.Context(), spaceObjID, userObjID, targetUserObjID); err != nil {
		http.Error(w, err.Error(), http.StatusBadRequest)
		return
	}

	w.Header().Set("Content-Type", "application/json")
	w.WriteHeader(http.StatusCreated)
	json.NewEncoder(w).Encode(map[string]string{"message": "member added"})
}

// RemoveMember removes a member from a space (owner/editor)
func (h *SpaceHandler) RemoveMember(w http.ResponseWriter, r *http.Request) {
	if r.Method != http.MethodDelete {
		http.Error(w, "Method not allowed", http.StatusMethodNotAllowed)
		return
	}

	spaceID := mux.Vars(r)["spaceId"]
	targetUserID := mux.Vars(r)["userId"]
	userID, err := middleware.GetUserIDFromContext(r.Context())
	if err != nil {
		http.Error(w, "Unauthorized", http.StatusUnauthorized)
		return
	}

	spaceObjID, err := bson.ObjectIDFromHex(spaceID)
	if err != nil {
		http.Error(w, "Invalid space id", http.StatusBadRequest)
		return
	}
	userObjID, err := bson.ObjectIDFromHex(userID)
	if err != nil {
		http.Error(w, "Invalid user id", http.StatusBadRequest)
		return
	}
	targetUserObjID, err := bson.ObjectIDFromHex(targetUserID)
	if err != nil {
		http.Error(w, "Invalid target user id", http.StatusBadRequest)
		return
	}

	if err := h.spaceService.RemoveMember(r.Context(), spaceObjID, userObjID, targetUserObjID); err != nil {
		http.Error(w, err.Error(), http.StatusBadRequest)
		return
	}

	w.WriteHeader(http.StatusNoContent)
}

// GetAvailableUsers returns user options for member selection (owner only)
func (h *SpaceHandler) GetAvailableUsers(w http.ResponseWriter, r *http.Request) {
	if r.Method != http.MethodGet {
		http.Error(w, "Method not allowed", http.StatusMethodNotAllowed)
		return
	}

	spaceID := mux.Vars(r)["spaceId"]
	userID, err := middleware.GetUserIDFromContext(r.Context())
	if err != nil {
		http.Error(w, "Unauthorized", http.StatusUnauthorized)
		return
	}

	spaceObjID, _ := bson.ObjectIDFromHex(spaceID)
	userObjID, _ := bson.ObjectIDFromHex(userID)

	users, err := h.spaceService.ListAvailableUsers(r.Context(), spaceObjID, userObjID)
	if err != nil {
		http.Error(w, err.Error(), http.StatusBadRequest)
		return
	}

	w.Header().Set("Content-Type", "application/json")
	json.NewEncoder(w).Encode(map[string]interface{}{"users": users})
}