#!/bin/sh
# rssamplifier CLI installer.
#
#   curl -fsSL https://rssamplifier.com/install.sh | sh
#
# Installs a single Node script to ~/.local/bin/rssamp. Nothing else is written,
# no package manager is invoked, and uninstalling is `rm` on the two files it
# names. Override the destination with RSSAMP_BIN=/somewhere/bin.
set -eu

SITE="${RSSAMP_SITE:-https://rssamplifier.com}"
BIN="${RSSAMP_BIN:-$HOME/.local/bin}"
SOURCE="$SITE/cli/rssamp"

say() { printf '%s\n' "$*"; }
fail() { printf 'error: %s\n' "$*" >&2; exit 1; }

# Node, and a new enough one. The CLI uses top-level await and a global fetch,
# so an old node fails at parse time with a message that has nothing to do with
# the real problem.
command -v node >/dev/null 2>&1 || fail "node is required. Install Node 22 or newer, then run this again."
node -e 'process.exit(parseInt(process.versions.node, 10) >= 22 ? 0 : 1)' 2>/dev/null ||
  fail "Node 22 or newer is required (found $(node -v))."

# curl or wget, whichever is here.
if command -v curl >/dev/null 2>&1; then
  fetch() { curl -fsSL "$1"; }
elif command -v wget >/dev/null 2>&1; then
  fetch() { wget -qO- "$1"; }
else
  fail "curl or wget is required."
fi

TMP="$(mktemp)"
# Clean up on any exit, including the failure paths below.
trap 'rm -f "$TMP"' EXIT INT TERM

say "Downloading $SOURCE"
fetch "$SOURCE" > "$TMP" || fail "download failed."

# Two cheap sanity checks. A proxy or a captive portal answering 200 with an
# HTML error page is the common failure, and installing that as an executable
# gives you a broken command with a baffling error rather than a clear one here.
head -n 1 "$TMP" | grep -q '^#!' || fail "downloaded file is not the CLI (no shebang). Check $SOURCE."
[ -s "$TMP" ] || fail "downloaded file is empty."

mkdir -p "$BIN"
install -m 0755 "$TMP" "$BIN/rssamp" 2>/dev/null || {
  cp "$TMP" "$BIN/rssamp" && chmod 0755 "$BIN/rssamp"
}

# The long name as a copy rather than a symlink: a symlink into ~/.local/bin
# breaks if the target is later removed, and this file is small enough that a
# second copy costs nothing.
cp "$BIN/rssamp" "$BIN/rssamplifier"
chmod 0755 "$BIN/rssamplifier"

VERSION="$("$BIN/rssamp" --version 2>/dev/null || echo '?')"
say ""
say "Installed rssamp $VERSION to $BIN"

# Only mention PATH when it is actually a problem. Telling everyone to edit
# their shell profile trains them to ignore the last line of installers.
case ":$PATH:" in
  *":$BIN:"*) say "Try:  rssamp topics homelab" ;;
  *)
    say ""
    say "$BIN is not on your PATH. Add it:"
    say "  echo 'export PATH=\"$BIN:\$PATH\"' >> ~/.profile && . ~/.profile"
    say ""
    say "Or run it directly:  $BIN/rssamp topics homelab"
    ;;
esac

say ""
say "Upgrade later with \`rssamp update\`, uninstall with \`rssamp remove\`."
say "Docs: $SITE/cli"