package auth

import (
	"net/http"
	"strings"
	"time"

	"github.com/alexedwards/scs/pgxstore"
	"github.com/alexedwards/scs/v2"
	"github.com/jackc/pgx/v5/pgxpool"
)

// NewSessionManager builds the scs session manager. cookieDomain is the session
// cookie Domain attribute: empty keeps a host-only cookie (localhost / same-host
// deploys). When the web app and API live on sibling hosts of one parent domain
// (descrybe.io + api.descrybe.io), set SESSION_COOKIE_DOMAIN=descrybe.io so the
// browser also sends the session cookie to the web host — SvelteKit SSR gates
// (/admin +layout.server.ts fetchMeStaff) forward it to /api/auth/me and would
// otherwise always see 401.
func NewSessionManager(pool *pgxpool.Pool, cookieName, cookieDomain string, secure bool, idleHours int) *scs.SessionManager {
	sm := scs.New()
	sm.Store = pgxstore.New(pool)
	sm.Lifetime = 7 * 24 * time.Hour
	if idleHours <= 0 {
		idleHours = 24
	}
	sm.IdleTimeout = time.Duration(idleHours) * time.Hour
	sm.Cookie.Name = cookieName
	sm.Cookie.Domain = strings.TrimPrefix(strings.TrimSpace(cookieDomain), ".")
	sm.Cookie.HttpOnly = true
	sm.Cookie.Secure = secure
	sm.Cookie.SameSite = http.SameSiteLaxMode
	sm.Cookie.Path = "/"
	return sm
}

const (
	SessionUserIDKey            = "user_id"
	SessionCompanyIDKey         = "company_id"
	SessionImpersonatorIDKey    = "impersonator_id" // non-prod user switch: original admin/demo
	SessionStaffHomeCompanyKey  = "staff_home_company_id" // platform admin tenant switch: home company to revert to
	SessionVersionKey           = "session_version" // must match users.session_version
)