#!/usr/bin/env bash
#
# mint — one-click Linux (x86_64, glibc) installer
#
# Steps:
#   1. Sanity-checks the host (arch, glibc, required GUI runtime libs).
#   2. Downloads the prebuilt tarball + sha256 from the public Gitea release.
#   3. Verifies the checksum, extracts, installs `mint` onto $PATH.
#   4. Runs a headless smoke test.
#
# Quick start:
#   curl -fsSL https://gitea.mygoband.com/carrydela/mint-linux/raw/branch/main/install.sh | bash
#
# Overridable env:
#   MINT_GITEA        gitea base url   (default: https://gitea.mygoband.com)
#   MINT_REPO         owner/repo       (default: carrydela/mint-linux)
#   MINT_TAG          release tag      (default: latest)
#   MINT_INSTALL_DIR  where to install (default: /usr/local/bin, else ~/.local/bin)
#
set -euo pipefail

GITEA="${MINT_GITEA:-https://gitea.mygoband.com}"
REPO="${MINT_REPO:-carrydela/mint-linux}"
TAG="${MINT_TAG:-latest}"
NAME="mint-linux-x86_64"          # asset stem; real file is ${NAME}.tar.gz
BIN="mint"
LOGO=$'\033[1;36mmint\033[0m'

log()  { printf '%s %b\n' "$LOGO" "$*"; }
die()  { printf 'error: %s\n' "$*" >&2; exit 1; }

# --- 1. host checks ---------------------------------------------------------
[ "$(uname -s)" = "Linux" ] || die "this installer is for Linux (host is $(uname -s))"
ARCH="$(uname -m)"
[ "$ARCH" = "x86_64" ] || die "only x86_64 is currently shipped (host is $ARCH)"

need() { command -v "$1" >/dev/null 2>&1 || die "missing required tool: $1 (install it first)"; }
need curl; need tar; need sha256sum

if ! ldd --version >/dev/null 2>&1; then
  echo "warning: ldd/glibc not detected — this build is glibc-linked and will not run" >&2
  echo "         on musl/Alpine. Use a musl-static build for those hosts." >&2
fi

# GUI runtime libs (loaded at runtime by egui/winit). Warn if absent.
missing=()
for probe in libxcb.so.1 libxkbcommon.so.0 libGL.so.1 libwayland-client.so.0 libX11.so.6; do
  ldconfig -p 2>/dev/null | grep -q "$probe" || missing+=("$probe")
done
if [ "${#missing[@]}" -gt 0 ]; then
  echo "warning: these GUI runtime libs are missing (the GUI will not launch until they are installed):" >&2
  printf '         %s\n' "${missing[@]}" >&2
  echo "         Debian/Ubuntu:  apt install libxcb1 libxkbcommon0 libgl1 libwayland-client0 libx11-6" >&2
  echo "         Fedora/RHEL:    dnf install libxcb libxkbcommon mesa-libGL wayland-client libX11" >&2
fi

# --- 2. resolve tag ---------------------------------------------------------
if [ "$TAG" = "latest" ]; then
  TAG="$(curl -fsSL "${GITEA}/api/v1/repos/${REPO}/releases/latest" \
          | sed -nE 's/.*"tag_name"[[:space:]]*:[[:space:]]*"([^"]+)".*/\1/p' | head -1)"
  [ -n "$TAG" ] || die "could not resolve the latest release tag from ${GITEA}/${REPO}"
fi
log "release tag: $TAG"

URL="${GITEA}/${REPO}/releases/download/${TAG}/${NAME}.tar.gz"
SHA_URL="${URL}.sha256"

# --- 3. download + verify ---------------------------------------------------
TMP="$(mktemp -d)"
trap 'rm -rf "$TMP"' EXIT

log "downloading: ${URL}"
curl -fL --progress-bar -o "$TMP/${NAME}.tar.gz" "$URL"

if curl -fsSL -o "$TMP/${NAME}.sha256" "$SHA_URL" 2>/dev/null; then
  log "verifying sha256..."
  expected="$(awk '{print $1; exit}' "$TMP/${NAME}.sha256")"
  actual="$(sha256sum "$TMP/${NAME}.tar.gz" | awk '{print $1}')"
  [ "$expected" = "$actual" ] || die "checksum mismatch (expected $expected, got $actual)"
  log "checksum ok"
else
  echo "warning: no published ${NAME}.tar.gz.sha256; skipping checksum verification." >&2
fi

log "extracting..."
tar -xzf "$TMP/${NAME}.tar.gz" -C "$TMP"
[ -f "$TMP/$BIN" ] || die "extracted archive does not contain '$BIN'"

# --- 4. install -------------------------------------------------------------
if [ -n "${MINT_INSTALL_DIR:-}" ]; then
  DEST="$MINT_INSTALL_DIR"
elif [ "$(id -u)" = 0 ] && [ -d /usr/local/bin ]; then
  DEST="/usr/local/bin"
elif [ -d /usr/local/bin ] && [ -w /usr/local/bin ]; then
  DEST="/usr/local/bin"
else
  DEST="$HOME/.local/bin"
fi
mkdir -p "$DEST"

TARGET="$DEST/$BIN"
install -m 0755 "$TMP/$BIN" "$TARGET"
log "installed: $TARGET"

case ":$PATH:" in
  *":$DEST:"*) : ;;
  *) echo "note: $DEST is not on your PATH — add it, or call the binary by full path." >&2 ;;
esac

# --- 5. smoke test (headless) ----------------------------------------------
if "$TARGET" --version >/dev/null 2>&1; then
  log "smoke test ok -> $($TARGET --version 2>/dev/null)"
else
  echo "warning: '$TARGET --version' failed; the GUI runtime libs above may be required." >&2
fi

log "done. launch it with:  mint"