#!/usr/bin/env bash
# Discord+ installer for macOS and Linux.
#
# What this does, in order:
#   1. Checks that Git and Node.js 22 or newer are installed (it does not install them for you).
#   2. Installs pnpm with npm if it is missing.
#   3. Downloads Discord+ from https://github.com/rossinskiy/discord-plus into ~/discord-plus,
#      or updates that folder if it is already there.
#   4. Installs the dependencies and builds Discord+.
#   5. Runs "pnpm inject", which asks which Discord to patch.
#
# After that, Discord+ keeps itself up to date: while Discord is open it checks this repository
# every half hour, downloads a new version, builds it and asks you to restart. It only ever
# follows the "release" branch, and it goes back to the working version if a build fails.
#
# It changes nothing outside that folder and Discord's own install. To undo it, run "pnpm uninject"
# inside the folder. Read this file before you run it, that is what it is here for.
#
# Tested on Windows and Arch Linux. macOS has not been tested yet. If it breaks, please open an issue.
#
# Settings for people who want them:
#   DISCORDPLUS_DIR          install somewhere else than ~/discord-plus
#   DISCORDPLUS_SKIP_INJECT  set to 1 to stop after the build, without touching Discord
#   DISCORDPLUS_ANY_OS       set to 1 to skip the check that this is macOS or Linux (for testing)

set -euo pipefail

REPO="https://github.com/rossinskiy/discord-plus.git"
DIR="${DISCORDPLUS_DIR:-$HOME/discord-plus}"

step() { printf '\n\033[32m==> %s\033[0m\n' "$1"; }
stop() { printf '\n\033[33m%s\033[0m\n' "$1" >&2; exit 1; }

# A package-manager hint for the one distribution family this has been written against.
hint() {
    if command -v pacman > /dev/null 2>&1; then
        printf ' On Arch Linux: sudo pacman -S %s.' "$1"
    fi
}

case "$(uname -s)" in
    Linux | Darwin) ;;
    *) [ "${DISCORDPLUS_ANY_OS:-}" = "1" ] || stop "This script is for macOS and Linux. On Windows use the PowerShell command from https://discordplus.karatel.win/install" ;;
esac

step "Checking Git"
command -v git > /dev/null 2>&1 || stop "Git is missing. Install it with your package manager (on macOS run: xcode-select --install).$(hint "git") Then open a new Terminal and run this again."

step "Checking Node.js (22 or newer)"
command -v node > /dev/null 2>&1 || stop "Node.js is missing. Install version 22 or newer from https://nodejs.org.$(hint "nodejs npm") Then open a new Terminal and run this again."
node -e 'process.exit(Number(process.versions.node.split(".")[0]) >= 22 ? 0 : 1)' \
    || stop "Node.js $(node --version) is too old, Discord+ needs 22 or newer. Update it from https://nodejs.org.$(hint "nodejs npm") Then run this again."

step "Checking pnpm"
if ! command -v pnpm > /dev/null 2>&1; then
    echo "pnpm is missing, installing it with npm."
    npm install --global pnpm \
        || stop "Could not install pnpm for you, the folder may need extra permission. Install it from https://pnpm.io/installation.$(hint "pnpm") Then open a new Terminal and run this again."
fi

step "Getting Discord+"
if [ -d "$DIR/.git" ]; then
    echo "Found $DIR, updating it."
    git -C "$DIR" pull --ff-only
else
    # Every install follows the release branch, which is where updates are published.
    # It falls back to the default branch if that branch does not exist yet.
    if ! git clone --depth 1 --branch release "$REPO" "$DIR"; then
        echo "No release branch yet, using the default branch."
        git clone --depth 1 "$REPO" "$DIR"
    fi
fi
cd "$DIR"

step "Installing dependencies (this takes a minute)"
pnpm install

step "Building Discord+"
pnpm build

if [ "${DISCORDPLUS_SKIP_INJECT:-}" = "1" ]; then
    printf '\nStopped before adding Discord+ to Discord, as asked.\n'
    exit 0
fi

step "Adding Discord+ to Discord"
echo "Close Discord first. Pick your Discord install when it asks."
echo "It finds Discord by itself. If it says permission denied, run the same command with sudo in front of bash."
# When this script is piped from curl, the keyboard is not the script's input, so the
# installer is given the terminal directly. Without that it could not ask anything.
if [ -r /dev/tty ]; then
    pnpm inject < /dev/tty
else
    pnpm inject
fi

printf '\n\033[32mDone.\033[0m Start Discord, open Settings, then Plugins, and switch on what you want.\n'
echo "To remove it later: cd \"$DIR\" and run: pnpm uninject"