#!/usr/bin/env bash
# Builds the desktop app (Tauri) and places the resulting bundles in dist-gui/.
#
#   scripts/build-gui.sh linux          # AppImage and .deb (native architecture)
#   scripts/build-gui.sh linux-aarch64  # AppImage and .deb for aarch64
#   scripts/build-gui.sh linux-x86_64   # AppImage and .deb for x86_64 (native or cross-built from aarch64)
#   scripts/build-gui.sh windows        # NSIS installer, cross-built from Linux via cargo-xwin
#   scripts/build-gui.sh windows-docker # Same as above inside an isolated container
#
# Windows builds use cargo-xwin and NSIS (requires: nsis, lld, llvm, clang, and
# `cargo install cargo-xwin`).
set -euo pipefail

cd "$(dirname "$0")/.."
platform=${1:?usage: build-gui.sh <linux|linux-x86_64|linux-aarch64|windows|windows-docker>}
tauri() { npx --yes @tauri-apps/cli@2 "$@"; }

if [ "$platform" = windows-docker ]; then
  docker volume create guara-cargo >/dev/null
  docker volume create guara-rustup >/dev/null
  mkdir -p dist-gui
  exec docker run --rm -v "$PWD":/src -v guara-cargo:/root/.cargo -v guara-rustup:/root/.rustup \
    -w /src -e HOST_UID="$(id -u)" -e HOST_GID="$(id -g)" \
    ubuntu:24.04 bash -c '
      set -e
      export DEBIAN_FRONTEND=noninteractive
      apt-get update -qq
      apt-get install -y -qq curl ca-certificates build-essential pkg-config nsis lld llvm clang nodejs npm unzip >/dev/null
      [ -x /root/.cargo/bin/rustup ] || curl -fsSL https://sh.rustup.rs | sh -s -- -y --profile minimal >/dev/null
      export PATH=/root/.cargo/bin:$PATH
      command -v cargo-xwin >/dev/null || cargo install cargo-xwin --locked
      scripts/build-gui.sh windows
      chown -R "$HOST_UID:$HOST_GID" dist-gui apps/gui/src-tauri/target 2>/dev/null || true'
fi

rm -rf dist-gui
mkdir -p dist-gui
cd apps/gui/src-tauri

[ -f icons/icon.ico ] || tauri icon icons/source.png -o icons

tauri_blob_cache="$HOME/.cache/tauri"
if [ -d /opt/hostedtoolcache ] && [ -w /opt/hostedtoolcache ]; then
  tauri_blob_cache="/opt/hostedtoolcache/tauri-tools"
fi
mkdir -p "$tauri_blob_cache" "$HOME/.cache/tauri"

fetch_cached_tool() {
  local name=$1 url=$2 patch_elf=${3:-0}
  local cached="$tauri_blob_cache/$name"
  if [ ! -s "$cached" ]; then
    local tmp="$cached.tmp.$$"
    curl -fsSL "$url" -o "$tmp"
    if [ "$patch_elf" = 1 ]; then
      dd if=/dev/zero of="$tmp" bs=1 count=3 seek=8 conv=notrunc 2>/dev/null
    fi
    chmod +x "$tmp"
    mv -f "$tmp" "$cached"
  fi
  if [ "$cached" != "$HOME/.cache/tauri/$name" ]; then
    cp -f "$cached" "$HOME/.cache/tauri/$name"
    chmod +x "$HOME/.cache/tauri/$name"
  fi
}

case "$platform" in
  linux|linux-aarch64)
    bundle="${CARGO_TARGET_DIR:-target}/release/bundle"
    rm -rf "$bundle/appimage" "$bundle/deb"
    tauri build --bundles appimage,deb
    cp "$bundle"/appimage/*.AppImage "$bundle"/deb/*.deb ../../../dist-gui/
    ;;
  linux-x86_64)
    if [ "$(uname -m)" = x86_64 ]; then
      bundle="${CARGO_TARGET_DIR:-target}/release/bundle"
      rm -rf "$bundle/appimage" "$bundle/deb"
      tauri build --bundles appimage,deb
    else
      rustup target add x86_64-unknown-linux-gnu >/dev/null
      mkdir -p /tmp/x86_64-cross-tools "$HOME/.cache/tauri"
      cat >/tmp/x86_64-cross-tools/ldd <<'EOF'
#!/usr/bin/env bash
exec qemu-x86_64 /lib64/ld-linux-x86-64.so.2 --list "$@"
EOF
      chmod +x /tmp/x86_64-cross-tools/ldd
      ln -sf /usr/bin/x86_64-linux-gnu-strip /tmp/x86_64-cross-tools/strip
      for tool_rel in glib-2.0/gio-querymodules gdk-pixbuf-2.0/gdk-pixbuf-query-loaders libgtk-3-0t64/gtk-query-immodules-3.0 libgtk-3-0/gtk-query-immodules-3.0; do
        if [ -x "/usr/lib/x86_64-linux-gnu/$tool_rel" ]; then
          tname=$(basename "$tool_rel")
          printf '#!/usr/bin/env bash\nexec qemu-x86_64 "/usr/lib/x86_64-linux-gnu/%s" "$@"\n' "$tool_rel" >"/tmp/x86_64-cross-tools/$tname"
          chmod +x "/tmp/x86_64-cross-tools/$tname"
        fi
      done
      fetch_cached_tool "linuxdeploy-07333c6-aarch64.AppImage" \
        "https://github.com/tauri-apps/binary-releases/releases/download/linuxdeploy-07333c6/linuxdeploy-aarch64.AppImage" 1
      # tauri-bundler looks for this exact cache name (no arch suffix); the
      # architecture only appears in the download URL.
      fetch_cached_tool "linuxdeploy-plugin-appimage.AppImage" \
        "https://github.com/linuxdeploy/linuxdeploy-plugin-appimage/releases/download/continuous/linuxdeploy-plugin-appimage-aarch64.AppImage" 1
      fetch_cached_tool "AppRun-x86_64" \
        "https://github.com/tauri-apps/binary-releases/releases/download/apprun-old/AppRun-x86_64" 0
      fetch_cached_tool "runtime-x86_64" \
        "https://github.com/AppImage/type2-runtime/releases/download/continuous/runtime-x86_64" 0
      # tauri-bundler runs `dd ... seek=8` on this path to hide linuxdeploy from
      # AppImage integration tools. A shell-script wrapper loses its shebang and
      # then fails with ENOENT, so use a native ELF launcher: the dd writes into
      # ELF padding and the launcher stays executable.
      launcher_src=/tmp/x86_64-cross-tools/linuxdeploy-x86_64.c
      launcher_bin="$HOME/.cache/tauri/linuxdeploy-07333c6-x86_64.AppImage"
      cat >"$launcher_src" <<'EOF'
#define _POSIX_C_SOURCE 200809L
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>

int main(int argc, char **argv) {
    const char *home = getenv("HOME");
    if (home == NULL) { fputs("HOME is not set\n", stderr); return 127; }
    char target[4096];
    char runtime[4096];
    char path[8192];
    const char *old_path = getenv("PATH");
    snprintf(target, sizeof target, "%s/.cache/tauri/linuxdeploy-07333c6-aarch64.AppImage", home);
    snprintf(runtime, sizeof runtime, "%s/.cache/tauri/runtime-x86_64", home);
    snprintf(path, sizeof path, "/tmp/x86_64-cross-tools:%s",
             old_path ? old_path : "/usr/local/bin:/usr/bin:/bin");
    if (setenv("ARCH", "x86_64", 1) ||
        setenv("NO_STRIP", "true", 1) ||
        setenv("APPIMAGE_EXTRACT_AND_RUN", "1", 1) ||
        setenv("LDAI_RUNTIME_FILE", runtime, 1) ||
        setenv("LD_GTK_LIBRARY_PATH", "/usr/lib/x86_64-linux-gnu", 1) ||
        setenv("DEB_HOST_MULTIARCH", "x86_64-linux-gnu", 1) ||
        setenv("PKG_CONFIG_ALLOW_CROSS", "1", 1) ||
        setenv("PKG_CONFIG_LIBDIR", "/usr/lib/x86_64-linux-gnu/pkgconfig:/usr/share/pkgconfig", 1) ||
        setenv("PATH", path, 1)) {
        perror("setenv");
        return 127;
    }
    char **args = calloc((size_t)argc + 1, sizeof *args);
    if (args == NULL) { perror("calloc"); return 127; }
    args[0] = target;
    for (int i = 1; i < argc; i++) args[i] = argv[i];
    execv(target, args);
    perror(target);
    return 127;
}
EOF
      cc -O2 -Wall -Wextra -o "$launcher_bin" "$launcher_src"
      export PKG_CONFIG_ALLOW_CROSS=1
      export PKG_CONFIG_LIBDIR=/usr/lib/x86_64-linux-gnu/pkgconfig:/usr/share/pkgconfig
      export CARGO_TARGET_X86_64_UNKNOWN_LINUX_GNU_LINKER=x86_64-linux-gnu-gcc
      export CC_x86_64_unknown_linux_gnu=x86_64-linux-gnu-gcc
      export CXX_x86_64_unknown_linux_gnu=x86_64-linux-gnu-g++
      bundle="${CARGO_TARGET_DIR:-target}/x86_64-unknown-linux-gnu/release/bundle"
      rm -rf "$bundle/appimage" "$bundle/deb"
      tauri build --target x86_64-unknown-linux-gnu --bundles appimage,deb
    fi
    cp "$bundle"/appimage/*.AppImage "$bundle"/deb/*.deb ../../../dist-gui/
    ;;
  windows)
    rustup target add x86_64-pc-windows-msvc >/dev/null
    bundle="${CARGO_TARGET_DIR:-target}/x86_64-pc-windows-msvc/release/bundle/nsis"
    rm -rf "$bundle"
    tauri build --runner cargo-xwin --target x86_64-pc-windows-msvc --bundles nsis
    cp "$bundle"/*-setup.exe ../../../dist-gui/
    ;;
  *) echo "unknown platform: $platform" >&2; exit 2 ;;
esac

(
  cd ../../../dist-gui
  for asset in *; do
    [ -f "$asset" ] || continue
    case "$asset" in
      *.sha256) ;;
      *)
        sha256sum "$asset" > "$asset.sha256"
        ;;
    esac
  done
)

ls -1 ../../../dist-gui