package session

import (
	"dk/internal/cookies"
	"dk/internal/router"
	"time"
)

const SessionCookieName = "dk_session"

var Manager *SessionManager

type SessionManager struct {
	store *Store
}

func Init(sessionsFilePath string) {
	if Manager != nil {
		panic("session manager already initialized")
	}
	Manager = &SessionManager{
		store: NewStore(sessionsFilePath),
	}
}

func GetManager() *SessionManager {
	if Manager == nil {
		panic("session manager not initialized")
	}
	return Manager
}

func (sm *SessionManager) Create(userID int, username, email string) *Session {
	sess := New(userID, username, email)
	sm.store.Save(sess)
	return sess
}

func (sm *SessionManager) Get(sessionID string) (*Session, bool) {
	return sm.store.Get(sessionID)
}

func (sm *SessionManager) GetFromContext(ctx router.Ctx) (*Session, bool) {
	sessionID := cookies.GetCookie(ctx, SessionCookieName)
	if sessionID == "" {
		return nil, false
	}
	return sm.Get(sessionID)
}

func (sm *SessionManager) Update(sessionID string) bool {
	sess, exists := sm.store.Get(sessionID)
	if !exists {
		return false
	}

	sess.Touch()
	sm.store.Save(sess)
	return true
}

func (sm *SessionManager) Delete(sessionID string) {
	sm.store.Delete(sessionID)
}

func (sm *SessionManager) SetSessionCookie(ctx router.Ctx, sessionID string) {
	cookies.SetSecureCookie(ctx, cookies.CookieOptions{
		Name:     SessionCookieName,
		Value:    sessionID,
		Path:     "/",
		Expires:  time.Now().Add(DefaultExpiration),
		HTTPOnly: true,
		Secure:   cookies.IsHTTPS(ctx),
		SameSite: "lax",
	})
}

func (sm *SessionManager) DeleteSessionCookie(ctx router.Ctx) {
	cookies.DeleteCookie(ctx, SessionCookieName)
}

func (sm *SessionManager) SetFlashMessage(ctx router.Ctx, msgType, message string) bool {
	sess, exists := sm.GetFromContext(ctx)
	if !exists {
		return false
	}

	sess.SetFlash("message", FlashMessage{
		Type:    msgType,
		Message: message,
	})
	sm.store.Save(sess)
	return true
}

func (sm *SessionManager) GetFlashMessage(ctx router.Ctx) *FlashMessage {
	sess, exists := sm.GetFromContext(ctx)
	if !exists {
		return nil
	}

	value, exists := sess.GetFlash("message")
	if !exists {
		return nil
	}

	sm.store.Save(sess)

	if msg, ok := value.(FlashMessage); ok {
		return &msg
	}

	if msgMap, ok := value.(map[string]interface{}); ok {
		msg := &FlashMessage{}
		if t, ok := msgMap["type"].(string); ok {
			msg.Type = t
		}
		if m, ok := msgMap["message"].(string); ok {
			msg.Message = m
		}
		return msg
	}

	return nil
}

func (sm *SessionManager) SetFormData(ctx router.Ctx, data map[string]string) bool {
	sess, exists := sm.GetFromContext(ctx)
	if !exists {
		return false
	}

	sess.Set("form_data", data)
	sm.store.Save(sess)
	return true
}

func (sm *SessionManager) GetFormData(ctx router.Ctx) map[string]string {
	sess, exists := sm.GetFromContext(ctx)
	if !exists {
		return nil
	}

	value, exists := sess.Get("form_data")
	if !exists {
		return nil
	}

	sess.Delete("form_data")
	sm.store.Save(sess)

	if formData, ok := value.(map[string]string); ok {
		return formData
	}

	if formMap, ok := value.(map[string]interface{}); ok {
		result := make(map[string]string)
		for k, v := range formMap {
			if str, ok := v.(string); ok {
				result[k] = str
			}
		}
		return result
	}

	return nil
}

func (sm *SessionManager) Stats() (total, active int) {
	return sm.store.Stats()
}

func (sm *SessionManager) Close() error {
	return sm.store.Close()
}

// Package-level convenience functions that use the global Manager

func Create(userID int, username, email string) *Session {
	return Manager.Create(userID, username, email)
}

func Get(sessionID string) (*Session, bool) {
	return Manager.Get(sessionID)
}

func GetFromContext(ctx router.Ctx) (*Session, bool) {
	return Manager.GetFromContext(ctx)
}

func Update(sessionID string) bool {
	return Manager.Update(sessionID)
}

func Delete(sessionID string) {
	Manager.Delete(sessionID)
}

func SetSessionCookie(ctx router.Ctx, sessionID string) {
	Manager.SetSessionCookie(ctx, sessionID)
}

func DeleteSessionCookie(ctx router.Ctx) {
	Manager.DeleteSessionCookie(ctx)
}

func SetFlashMessage(ctx router.Ctx, msgType, message string) bool {
	return Manager.SetFlashMessage(ctx, msgType, message)
}

func GetFlashMessage(ctx router.Ctx) *FlashMessage {
	return Manager.GetFlashMessage(ctx)
}

func SetFormData(ctx router.Ctx, data map[string]string) bool {
	return Manager.SetFormData(ctx, data)
}

func GetFormData(ctx router.Ctx) map[string]string {
	return Manager.GetFormData(ctx)
}

func Stats() (total, active int) {
	return Manager.Stats()
}

func Close() error {
	return Manager.Close()
}