#!/data/data/com.termux/files/usr/bin/bash
# install.sh - Install mdns-termux scripts to ~/.local/bin
# Usage: bash install.sh [--dry-run]
set -euo pipefail

DRY_RUN=0
[[ "${1:-}" == "--dry-run" ]] && DRY_RUN=1

SCRIPT_DIR="$(cd "$(dirname "$0")" && pwd)"
BIN_DIR="$HOME/.local/bin"

run() {
    if [[ $DRY_RUN -eq 1 ]]; then
        echo "[dry-run] $*"
    else
        eval "$@"
    fi
}

step() { echo ""; echo ">>> Step $1: $2"; }

# 1. Verify Termux
step 1 "Verifying Termux environment..."
if [[ -z "${PREFIX:-}" || "$PREFIX" != *"com.termux"* ]]; then
    echo "ERROR: This installer targets Termux. \$PREFIX not set as expected." >&2
    exit 1
fi
echo "  Termux detected: $PREFIX"

# 2. Base packages
step 2 "Installing required packages (pkg + pip)..."
run "pkg install -y python proot"
run "pip install --upgrade zeroconf"

# 3. Symlink CLI scripts (bin/) and library (lib/) — symlinks keep git-pull updates live
step 3 "Linking scripts into $BIN_DIR..."
run "mkdir -p '$BIN_DIR'"
for script in mdns mdns-resolve mdns-publish.py ssh-mdns-proxy ssh-fallback resolve; do
    run "ln -sf '$SCRIPT_DIR/bin/$script' '$BIN_DIR/$script'"
done

# 4. Sample services config
step 4 "Sample services config for `mdns publish`..."
CFG_DIR="$HOME/.config/mdns"
run "mkdir -p '$CFG_DIR'"
if [[ ! -f "$CFG_DIR/services.json" ]]; then
    run "cp '$SCRIPT_DIR/config/services.example.json' '$CFG_DIR/services.json'"
    echo "  Wrote $CFG_DIR/services.json (edit before running mdns publish)."
else
    echo "  $CFG_DIR/services.json already exists, keeping it."
fi

# 5. Reminders
step 5 "Manual steps remaining:"
cat <<EOF

  a) Append aliases to ~/.bashrc:
       cat $SCRIPT_DIR/config/bashrc.snippet >> ~/.bashrc
     Then edit TAILSCALE_DOMAIN inside your ~/.bashrc.

  b) (Optional) Merge SSH config for .local + short-name resolution:
       cat $SCRIPT_DIR/config/ssh_config.example >> ~/.ssh/config
     Adjust User and hostnames.

  c) Try it:
       mdns browse --list-types             # discover service types on the LAN
       mdns browse --type _ssh._tcp.local.  # list SSH hosts
       mdns resolve <host>                  # host -> IP (v4 by default)
       mdns resolve <host> --family v6      # IPv6
       mdns reverse <ip>                    # IP -> hostname
       mdns publish                         # advertise this device + services
       resolve <host>                       # bash wrapper (any command)

EOF
echo "Done."