#!/usr/bin/env bash
# Install the addons the configuration asks for (ADDONS), in the order listed.
# One idempotent script per addon: the overlay's addons/<name>.sh first, then rig's ctrl/addons/.
# Usage: addons.sh install | list
# Notes: docs/notes/addons.md
set -euo pipefail
cd "$(dirname "$0")"

source ./lib/config.sh
load_config

# Every addon runs from here, wherever its file lives, so it can source ./lib/config.sh.
export RIG_CTRL="$PWD"

# The script for one addon name: the overlay's, else rig's; empty if neither.
addon_path() {
    local ov=""
    if [ -n "$OVERLAY_DIR" ]; then ov="$(_from_ctrl "$OVERLAY_DIR")/addons/$1.sh"; fi
    if [ -n "$ov" ] && [ -f "$ov" ]; then
        echo "$ov"
    elif [ -f "addons/$1.sh" ]; then
        echo "addons/$1.sh"
    fi
}

install() {
    if [ -z "${ADDONS// /}" ]; then
        echo "no addons asked for (ADDONS is empty)"
        return
    fi
    local a p
    for a in $ADDONS; do
        p=$(addon_path "$a")
        if [ -z "$p" ]; then
            echo "no such addon: $a (looked in the overlay's addons/ and ctrl/addons/)" >&2
            exit 1
        fi
        echo "addon: $a"
        bash "$p"
    done
}

list() {
    echo "wanted: ${ADDONS:-none}"
    echo "available:"
    local f
    if [ -n "$OVERLAY_DIR" ]; then
        for f in "$(_from_ctrl "$OVERLAY_DIR")"/addons/*.sh; do
            [ -e "$f" ] || continue
            printf '  %-16s overlay\n' "$(basename "$f" .sh)"
        done
    fi
    for f in addons/*.sh; do
        [ -e "$f" ] || continue
        printf '  %-16s rig\n' "$(basename "$f" .sh)"
    done
}

case "${1:-list}" in
    install) install ;;
    list)    list ;;
    *)       echo "usage: $0 [install|list]" >&2; exit 1 ;;
esac