#!/bin/sh
# Blue Text Relay installer: https://bluetextrelay.com/install.sh
# Self-hosted MCP server for iMessage. Read this before you run it; it is short.
#
#   curl -fsSL https://bluetextrelay.com/install.sh | sh
#
# What it does, and nothing else:
#   1. Checks you're on macOS 14 or later.
#   2. Downloads imx 1.0.0 (the Blue Text Relay CLI, universal binary) from downloads.bluetextrelay.com.
#   3. Verifies its SHA-256 against the published SHA256SUMS. Stops if it doesn't match.
#   4. Unpacks it to ~/.local/share/blue-text-relay/1.0.0 and links ~/.local/bin/imx.
# No sudo. No telemetry. Nothing runs in the background until you ask for it (imx service install).
#
# Options (environment variables):
#   BTR_VERSION=1.0.0      install a specific version
#   BTR_BIN_DIR=/path      where to put the imx link (default ~/.local/bin)
# Uninstall:
#   imx service uninstall; rm -rf ~/.local/share/blue-text-relay ~/.local/bin/imx

set -eu

main() {
    version="${BTR_VERSION:-1.0.0}"
    base="https://downloads.bluetextrelay.com"
    tarball="imx-$version-macos.tar.gz"
    share="$HOME/.local/share/blue-text-relay/$version"
    bindir="${BTR_BIN_DIR:-$HOME/.local/bin}"

    say() { printf '\033[1;34m==>\033[0m %s\n' "$1"; }
    die() { printf '\033[1;31merror:\033[0m %s\n' "$1" >&2; exit 1; }

    [ "$(uname -s)" = "Darwin" ] || die "Blue Text Relay runs on macOS only (it reads the Messages database on a Mac)."
    major="$(sw_vers -productVersion | cut -d. -f1)"
    [ "$major" -ge 14 ] || die "macOS 14 or later is required (this Mac has $(sw_vers -productVersion))."
    command -v curl >/dev/null || die "curl is required."

    tmp="$(mktemp -d)"
    trap 'rm -rf "$tmp"' EXIT

    say "Downloading $tarball"
    curl -fsSL "$base/$tarball" -o "$tmp/$tarball" || die "download failed: $base/$tarball"
    curl -fsSL "$base/SHA256SUMS" -o "$tmp/SHA256SUMS" || die "couldn't fetch checksums: $base/SHA256SUMS"

    say "Verifying SHA-256"
    expected="$(grep " $tarball\$" "$tmp/SHA256SUMS" | awk '{print $1}')"
    [ -n "$expected" ] || die "$tarball is not listed in SHA256SUMS"
    actual="$(shasum -a 256 "$tmp/$tarball" | awk '{print $1}')"
    [ "$expected" = "$actual" ] || die "checksum mismatch (expected $expected, got $actual). Nothing was installed."

    say "Installing to $share"
    rm -rf "$share"
    mkdir -p "$share" "$bindir"
    tar -xzf "$tmp/$tarball" -C "$share" --strip-components 1
    ln -sf "$share/imx" "$bindir/imx"

    printf '\n  Installed imx %s -> %s\n\n' "$version" "$bindir/imx"
    case ":$PATH:" in
        *":$bindir:"*) ;;
        *) printf '  Add it to your PATH:\n    echo '\''export PATH="%s:$PATH"'\'' >> ~/.zshrc && exec zsh\n\n' "$bindir" ;;
    esac
    printf '  Next:\n'
    printf '    1. Give this binary Full Disk Access (macOS asks once; it is how any app reads Messages):\n'
    printf '       System Settings > Privacy & Security > Full Disk Access > + > %s\n' "$share/imx"
    printf '       open "x-apple.systempreferences:com.apple.preference.security?Privacy_AllFiles"\n'
    printf '    2. imx setup              # pick threads, create an access key, choose Tailscale\n'
    printf '    3. imx service install    # optional: keep it running at login\n\n'
    printf '  Docs: https://bluetextrelay.com/docs   Agents: https://bluetextrelay.com/llms.txt\n'
}

main "$@"