#!/usr/bin/env bash
# Tailwind CSS standalone + daisyUI, vendored in tools/tailwind/ so building never touches the network.
# MSBuild runs `prepare` (EnsureTailwindTools in decePubClient.csproj) and then compiles Styles/app.css itself.
#   bash tools/tailwind.sh prepare  verify the vendored files and unpack the binary into .tools/tailwind/
#   bash tools/tailwind.sh build    one-off build of wwwroot/css/app.css (what MSBuild does in Debug)
#   bash tools/tailwind.sh watch    rebuild wwwroot/css/app.css on every change, beside `dotnet watch`
#
# tools/tailwind/ holds:
#   tailwindcss-linux-x64.xz  the Tailwind CSS v4.3.3 standalone binary, xz -9e compressed
#   daisyui.mjs, daisyui-theme.mjs  the daisyUI v5.7.47 plugins (Styles/app.css and Styles/theme.css load them)
#   daisyui-llms.txt  daisyUI's component reference for v5.7.x, read when writing Components/Daisy
#
# To upgrade, take the new release assets (tailwindcss-linux-x64 from Tailwind's release, daisyui.mjs and
# daisyui-theme.mjs from daisyUI's), check them against the checksums the projects publish, replace the files here
# (`xz -9e -c tailwindcss-linux-x64 > tools/tailwind/tailwindcss-linux-x64.xz`), and update the versions and every
# sha256 below. Only linux-x64 is vendored; another platform needs its binary added the same way.
set -euo pipefail

TAILWIND_VERSION=4.3.3

pinned_sha256() {
	case "$1" in
		tailwindcss-linux-x64) echo dc61b3ac6b8c9ca874c0cc4c57b2409791a64c5540404ca5f5367360babc313a ;;
		tailwindcss-linux-x64.xz) echo 8ad24bb6ac4f615fa9a1abdf4b49143690eaa5531a62a49e89f4eab0c91ad02b ;;
		daisyui.mjs) echo 85819d3fe86a852237b439b13f481481aac58e562ac47694cd11c3038e994f2a ;;
		daisyui-theme.mjs) echo d92d2f488933dab757f046e81ebd4986e51e9423307798dc3545d09a15542c89 ;;
		*) echo "tailwind.sh: no pinned checksum for $1" >&2; exit 1 ;;
	esac
}

ROOT="$(cd "$(dirname "${BASH_SOURCE[0]}")/.." && pwd)"
VENDOR="$ROOT/tools/tailwind"
TOOLS="$ROOT/.tools/tailwind"
TAILWIND="$TOOLS/tailwindcss"

platform() {
	case "$(uname -s)-$(uname -m)" in
		Linux-x86_64|Linux-amd64) echo linux-x64 ;;
		*) echo "tailwind.sh: only the linux-x64 Tailwind binary is vendored (this is $(uname -s)-$(uname -m))" >&2; exit 1 ;;
	esac
}

sha256_of() {
	if command -v sha256sum >/dev/null; then sha256sum "$1" | cut -d' ' -f1; else shasum -a 256 "$1" | cut -d' ' -f1; fi
}

# verify <file> <pinned name>
verify() {
	local actual expected
	actual="$(sha256_of "$1")"
	expected="$(pinned_sha256 "$2")"
	if [ "$actual" != "$expected" ]; then
		echo "tailwind.sh: checksum mismatch for $1 (expected $expected, got $actual)" >&2
		return 1
	fi
}

prepare() {
	local asset
	asset="tailwindcss-$(platform)"
	verify "$VENDOR/daisyui.mjs" daisyui.mjs
	verify "$VENDOR/daisyui-theme.mjs" daisyui-theme.mjs
	if [ -f "$TAILWIND" ] && verify "$TAILWIND" "$asset" 2>/dev/null; then return; fi
	command -v xz >/dev/null || { echo "tailwind.sh: xz is needed to unpack $asset.xz" >&2; exit 1; }
	verify "$VENDOR/$asset.xz" "$asset.xz"
	echo "tailwind.sh: unpacking Tailwind CSS v$TAILWIND_VERSION ($asset) into .tools/tailwind/"
	mkdir -p "$TOOLS"
	xz -dc "$VENDOR/$asset.xz" > "$TAILWIND.part"
	verify "$TAILWIND.part" "$asset" || { rm -f "$TAILWIND.part"; exit 1; }
	chmod +x "$TAILWIND.part"
	mv "$TAILWIND.part" "$TAILWIND"
}

cd "$ROOT"
case "${1:-build}" in
	prepare) prepare ;;
	build) prepare; "$TAILWIND" -i Styles/app.css -o wwwroot/css/app.css --optimize ;;
	watch) prepare; exec "$TAILWIND" -i Styles/app.css -o wwwroot/css/app.css --watch ;;
	*) echo "usage: tailwind.sh [prepare|build|watch]" >&2; exit 2 ;;
esac