#!/bin/bash

# Shared helpers for the peer subsystem. Peers are named other LibrePortal
# instances; rows live in the sqlite `peers` table (db_create_tables.sh).
#
# kind enum:
#   backup-channel        Friendly label over a hostname that shows up in a
#                         shared backup repo. No new networking — Phase 1/2.
#   direct-ssh-direct     Reachable peer over plain SSH (Phase 3).
#   direct-ssh-via-relay  Peer over Connect's blind relay (Phase 3b).
#
# config_json is kind-specific. For backup-channel:
#   {"hostname":"homelab","loc_idx":1}

_peerDb() { echo "$docker_dir/$db_file"; }

# Quote a value for SQLite (escape single quotes by doubling). Stdin in,
# stdout out. Caller wraps the result in their own single quotes.
peerSqlEscape()
{
    local s="$1"
    printf "%s" "${s//\'/\'\'}"
}

# Validate that a string is a reasonable peer-name (alnum, dash, underscore,
# dot; 1..64 chars). Echo "ok" or the rejection reason; caller checks for "ok".
peerValidateName()
{
    local name="$1"
    if [[ -z "$name" ]]; then echo "empty"; return 1; fi
    if [[ ${#name} -gt 64 ]]; then echo "too-long"; return 1; fi
    if [[ ! "$name" =~ ^[A-Za-z0-9._-]+$ ]]; then echo "invalid-chars"; return 1; fi
    echo "ok"
}

# Validate kind. backup-channel (Phase 1/2) and direct-ssh-direct (Phase 3)
# are live; direct-ssh-via-relay needs Connect to exist (Phase 3b).
peerValidateKind()
{
    local kind="$1"
    case "$kind" in
        backup-channel|direct-ssh-direct)  echo "ok" ;;
        direct-ssh-via-relay)
            echo "needs-connect"; return 1 ;;
        *) echo "unknown-kind"; return 1 ;;
    esac
}