package handlers

import (
	"encoding/json"
	"fmt"
	"log/slog"
	"net/http"
	"strings"

	"gitlab.com/unboundsoftware/auth0mock/store"
)

// ManagementHandler handles Auth0 Management API endpoints
type ManagementHandler struct {
	userStore *store.UserStore
	logger    *slog.Logger
}

// NewManagementHandler creates a new management handler
func NewManagementHandler(userStore *store.UserStore, logger *slog.Logger) *ManagementHandler {
	return &ManagementHandler{
		userStore: userStore,
		logger:    logger,
	}
}

// UserResponse represents the user response format
type UserResponse struct {
	Email      string `json:"email,omitempty"`
	GivenName  string `json:"given_name,omitempty"`
	FamilyName string `json:"family_name,omitempty"`
	UserID     string `json:"user_id"`
	Picture    string `json:"picture,omitempty"`
}

// GetUsersByEmail handles GET /api/v2/users-by-email
func (h *ManagementHandler) GetUsersByEmail(w http.ResponseWriter, r *http.Request) {
	email := r.URL.Query().Get("email")

	h.logger.Debug("getting user by email", "email", email)

	user, ok := h.userStore.GetByEmail(email)
	if !ok {
		w.Header().Set("Content-Type", "application/json")
		json.NewEncoder(w).Encode([]interface{}{})
		return
	}

	response := []UserResponse{
		{
			Email:      user.Email,
			GivenName:  user.GivenName,
			FamilyName: user.FamilyName,
			UserID:     fmt.Sprintf("auth0|%s", user.UserID),
			Picture:    user.Picture,
		},
	}

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

// CreateUser handles POST /api/v2/users
func (h *ManagementHandler) CreateUser(w http.ResponseWriter, r *http.Request) {
	var req struct {
		Email      string `json:"email"`
		GivenName  string `json:"given_name"`
		FamilyName string `json:"family_name"`
	}

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

	if req.Email == "" {
		http.Error(w, "Email is required", http.StatusBadRequest)
		return
	}

	user := &store.User{
		Email:      req.Email,
		GivenName:  req.GivenName,
		FamilyName: req.FamilyName,
		UserID:     req.Email,
	}

	// Set defaults if not provided
	if user.GivenName == "" {
		user.GivenName = "Given"
	}
	if user.FamilyName == "" {
		user.FamilyName = "Last"
	}

	h.userStore.Create(req.Email, user)

	h.logger.Info("created user", "email", req.Email)

	w.Header().Set("Content-Type", "application/json")
	json.NewEncoder(w).Encode(map[string]string{
		"user_id": fmt.Sprintf("auth0|%s", req.Email),
	})
}

// UpdateUser handles PATCH /api/v2/users/{userid}
func (h *ManagementHandler) UpdateUser(w http.ResponseWriter, r *http.Request) {
	// Extract user ID from path - format: /api/v2/users/auth0|email@example.com
	path := r.URL.Path
	userID := strings.TrimPrefix(path, "/api/v2/users/")

	// Strip "auth0|" prefix to get email
	email := strings.TrimPrefix(userID, "auth0|")

	h.logger.Debug("patching user", "userid", userID, "email", email)

	var req struct {
		GivenName  string `json:"given_name"`
		FamilyName string `json:"family_name"`
		Picture    string `json:"picture"`
	}

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

	updates := &store.User{
		GivenName:  req.GivenName,
		FamilyName: req.FamilyName,
		Picture:    req.Picture,
	}

	_, ok := h.userStore.Update(email, updates)
	if !ok {
		http.Error(w, "User not found", http.StatusNotFound)
		return
	}

	h.logger.Info("updated user", "email", email)

	w.Header().Set("Content-Type", "application/json")
	json.NewEncoder(w).Encode(map[string]string{
		"user_id": fmt.Sprintf("auth0|%s", email),
	})
}

// PasswordChangeTicket handles POST /api/v2/tickets/password-change
func (h *ManagementHandler) PasswordChangeTicket(w http.ResponseWriter, r *http.Request) {
	w.Header().Set("Content-Type", "application/json")
	json.NewEncoder(w).Encode(map[string]string{
		"ticket": "https://some-url",
	})
}