#!/bin/sh
# poddle installer.
#
#   curl -sSf https://raw.githubusercontent.com/datadir-lab/poddle/HEAD/install.sh | sh
#
# Env overrides:
#   PODDLE_VERSION       tag to install (default: latest release)
#   PODDLE_INSTALL_DIR   install dir (default: /usr/local/bin, else ~/.local/bin)
#
# poddle runs pods with podman; install that separately.
set -eu

REPO="datadir-lab/poddle"
BIN="poddle"

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

command -v uname >/dev/null 2>&1 || err "uname not found"
command -v tar >/dev/null 2>&1 || err "tar not found"

# Downloader (curl or wget).
if command -v curl >/dev/null 2>&1; then
	dl() { curl -fsSL "$1"; }
	dlo() { curl -fsSL "$1" -o "$2"; }
elif command -v wget >/dev/null 2>&1; then
	dl() { wget -qO- "$1"; }
	dlo() { wget -qO "$2" "$1"; }
else
	err "need curl or wget"
fi

# OS + arch -> goreleaser archive naming.
os=$(uname -s)
arch=$(uname -m)
case "$os" in
Linux) goos=linux ;;
Darwin) goos=darwin ;;
*) err "unsupported OS: $os (try: go install github.com/$REPO/src@latest)" ;;
esac
case "$arch" in
x86_64 | amd64) goarch=amd64 ;;
arm64 | aarch64) goarch=arm64 ;;
*) err "unsupported arch: $arch" ;;
esac

# Resolve version.
ver="${PODDLE_VERSION:-}"
if [ -z "$ver" ]; then
	ver=$(dl "https://api.github.com/repos/$REPO/releases/latest" |
		grep '"tag_name"' | head -1 | sed -E 's/.*"tag_name": *"([^"]+)".*/\1/')
	[ -n "$ver" ] || err "could not resolve latest version; set PODDLE_VERSION"
fi
num=${ver#v}
info "Installing poddle $ver ($goos/$goarch)"

tmp=$(mktemp -d)
trap 'rm -rf "$tmp"' EXIT INT TERM
archive="${BIN}_${num}_${goos}_${goarch}.tar.gz"
base="https://github.com/$REPO/releases/download/$ver"
dlo "$base/$archive" "$tmp/$archive" || err "download failed: $archive"

# Verify checksum when a sha256 tool is available.
if command -v sha256sum >/dev/null 2>&1; then
	sumcmd="sha256sum -c"
elif command -v shasum >/dev/null 2>&1; then
	sumcmd="shasum -a 256 -c"
else
	sumcmd=""
fi
if [ -n "$sumcmd" ] && dlo "$base/checksums.txt" "$tmp/checksums.txt" 2>/dev/null; then
	grep " $archive$" "$tmp/checksums.txt" >"$tmp/sum" 2>/dev/null || err "no checksum listed for $archive"
	(cd "$tmp" && $sumcmd sum >/dev/null 2>&1) && info "checksum verified" || err "checksum verification failed"
else
	info "skipping checksum verification (no sha256 tool or checksums.txt)"
fi

tar -xzf "$tmp/$archive" -C "$tmp"
[ -f "$tmp/$BIN" ] || err "binary '$BIN' not found in archive"

# Install dir.
dir="${PODDLE_INSTALL_DIR:-}"
if [ -z "$dir" ]; then
	if [ -d /usr/local/bin ] && [ -w /usr/local/bin ]; then
		dir=/usr/local/bin
	else
		dir="$HOME/.local/bin"
	fi
fi
mkdir -p "$dir"
if [ -w "$dir" ]; then
	install -m 0755 "$tmp/$BIN" "$dir/$BIN"
else
	info "writing to $dir needs sudo"
	sudo install -m 0755 "$tmp/$BIN" "$dir/$BIN"
fi

info "poddle installed to $dir/$BIN"
case ":$PATH:" in
*":$dir:"*) ;;
*) info "add $dir to your PATH to run 'poddle'" ;;
esac
"$dir/$BIN" version 2>/dev/null || true