#!/bin/sh
# Installs Apple Bridge for this user. Run again to update.
# https://github.com/JohanSardar/apple-bridge/blob/main/docs/local-setup.md
set -eu

VERSION=0.1.5
SHA256=fb6432d1022826e0a05f4317a9fc3601790fde6a9905b95892d0b32cb20b89d6
URL=https://github.com/JohanSardar/apple-bridge/releases/download/v$VERSION/applebridge-$VERSION.tgz

fail() {
    echo "Apple Bridge: $*" >&2
    exit 1
}

clean_up() {
    if [ -e "$work/previous" ] && [ ! -e "$root" ]; then
        mv "$work/previous" "$root" || echo "Apple Bridge: your previous install is still in $work/previous." >&2
        [ -e "$root" ] || return 0
    fi
    rm -rf "$work"
}

add_to_path() {
    case ":$PATH:" in
        *":$bin_dir:"*) return 0 ;;
    esac
    case "${SHELL:-}" in
        */zsh) profile=${ZDOTDIR:-$HOME}/.zshrc ;;
        */bash)
            profile=$HOME/.bash_profile
            for candidate in "$HOME/.bash_profile" "$HOME/.bash_login" "$HOME/.profile"; do
                if [ -e "$candidate" ]; then
                    profile=$candidate
                    break
                fi
            done
            ;;
        *)
            echo "Add this to your shell startup file: export PATH=\"$bin_dir:\$PATH\""
            return 0
            ;;
    esac
    line='export PATH="$HOME/.local/bin:$PATH"'
    if ! grep -Fqx "$line" "$profile" 2>/dev/null; then
        printf '\n%s\n' "$line" >>"$profile"
        echo "Added ~/.local/bin to your PATH in $profile."
    fi
    echo "Open a new terminal, or run this in the current one: $line"
}

main() {
    [ "$(id -u)" != 0 ] || fail "run this without sudo."
    [ "$(uname -s)" = Darwin ] && [ "$(uname -m)" = arm64 ] || fail "this needs a Mac with Apple silicon."
    release=$(uname -r)
    [ "${release%%.*}" -ge 25 ] || fail "this needs macOS 26 or later."

    root=$HOME/.applebridge
    bin_dir=$HOME/.local/bin
    link=$bin_dir/bridge
    if [ -e "$link" ] || [ -L "$link" ]; then
        [ -L "$link" ] && [ "$(readlink "$link")" = "$root/bin/bridge" ] ||
            fail "$link already exists and isn't from this installer. Move it, then run this again."
    fi
    if [ -e "$root" ] || [ -L "$root" ]; then
        [ ! -L "$root" ] && [ -x "$root/bin/bridge" ] && [ -d "$root/Apple Bridge.app" ] ||
            fail "$root already exists and isn't an Apple Bridge install. Move it, then run this again."
    fi

    work=$(mktemp -d "$HOME/.applebridge-install.XXXXXX")
    trap clean_up EXIT
    trap 'exit 1' HUP INT TERM

    echo "Downloading Apple Bridge $VERSION..."
    curl -fsSL "$URL" -o "$work/package.tgz" || fail "the download failed. Nothing was changed."
    actual=$(shasum -a 256 "$work/package.tgz" | cut -d ' ' -f 1)
    [ "$actual" = "$SHA256" ] || fail "the download doesn't match the expected checksum. Nothing was changed."
    tar -xzf "$work/package.tgz" -C "$work"

    mkdir -p "$bin_dir"
    if [ -e "$root" ]; then
        "$root/bin/bridge" down || fail "couldn't stop the running version. Nothing was changed."
        mv "$root" "$work/previous"
    fi
    mv "$work/package" "$root"
    ln -sfn "$root/bin/bridge" "$link"

    echo "Apple Bridge $VERSION is installed."
    add_to_path
    cat <<'NEXT'

Next:
  bridge up                   # start Apple Bridge. It asks nothing
  bridge link claude          # connect Claude Code. Or: bridge link codex
  bridge permissions guide    # allow the Mac permissions you want
  bridge stats --watch        # counts per source, as each one finishes
NEXT
}

main "$@"