#!/usr/bin/env bash
set -euo pipefail
# POS: config — Interactive editor for the tools' runtime config (reads # POS_CONFIG: registry)

source "$(dirname "$0")/../lib/common.sh" 2>/dev/null || source "$(dirname "$0")/common.sh"
source "$(dirname "$0")/../lib/config-ui.sh" 2>/dev/null || source "$(dirname "$0")/config-ui.sh"

usage() {
    cat <<EOF
Usage: pos config [<scope>]

Interactive editor for the tools' runtime config. Every tool exposes its
configuration by declaring a "# POS_CONFIG:" header; pos config reads those
at runtime — the UI knows nothing about the variables themselves.

  pos config              Scope picker (on a TTY), otherwise the scope list
  pos config <scope>      Edit that scope's variables
  pos config --help       This help

Scopes:
$(cfg_scopes | sed 's/^/  /')

How a tool registers a scope (one "# POS_CONFIG:" header per scope):

  # POS_CONFIG: <scope> | <env-file> | <KEY>=<flags>:<description> | ... | *plugins

  <env-file>  config file under ~/.config/linux_post_install/ (chmod 600)
  <flags>     secret (masked display + hidden input) | digits | num | float
  *plugins    also list the keys declared by installed plugins' # POS_KEYS:
              headers (the entertainment scope's keys are dynamic)

Editing rules: Enter keeps the current value, "-" clears it, q quits.
Values can also be set non-interactively with each tool's 'config set KEY=VALUE'.
EOF
    exit 0
}

case "${1:-}" in
    -h|--help) usage ;;
esac

pick_scope() {
    local scopes=() s i env
    while IFS= read -r s; do
        if [ -n "$s" ]; then
            scopes+=("$s")
        fi
    done < <(cfg_scopes)
    if [ ${#scopes[@]} -eq 0 ]; then
        err "no config scopes found — no tool declares a '# POS_CONFIG:' header"
    fi
    echo
    echo "pos config — pick a scope"
    echo "------------------------------------"
    for ((i = 1; i <= ${#scopes[@]}; i++)); do
        env="$(cfg_scope_envfile "${scopes[$((i - 1))]}" || true)"
        printf '  %2d) %-16s %s\n' "$i" "${scopes[$((i - 1))]}" "${env:-}"
    done
    echo
    local idx
    read -rp "Scope number: " idx || { echo; exit 1; }
    if ! [[ "$idx" =~ ^[0-9]+$ ]] || (( idx < 1 || idx > ${#scopes[@]} )); then
        err "invalid number '$idx'"
    fi
    cfg_ui "${scopes[$((idx - 1))]}"
}

if [ $# -eq 0 ]; then
    if [ -t 0 ]; then
        pick_scope
    else
        usage
    fi
else
    scope="${1:-}"
    case " $(cfg_scopes | tr '\n' ' ') " in
        *" $scope "*) cfg_ui "$scope" ;;
        *) err "unknown config scope '$scope' (try: $(cfg_scopes | tr '\n' ' '))" ;;
    esac
fi