#!/usr/bin/env bash
# Tailwind CSS standalone + daisyUI, with no Node. MSBuild runs `fetch` (decePubClient.csproj, EnsureTailwindTools)
# and then compiles Styles/app.css itself; run `watch` beside `dotnet watch` for live CSS work.
#   bash tools/tailwind.sh fetch    download and verify the pinned binaries 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
#   bash tools/tailwind.sh docs     fetch daisyUI's llms.txt (component reference, unpinned) into .tools/tailwind/
set -euo pipefail

TAILWIND_VERSION=4.3.3
DAISYUI_VERSION=5.7.47

# sha256 of each release asset. Tailwind's are from its release sha256sums.txt; daisyUI publishes none, so these were
# computed from the v5.7.47 release assets.
pinned_sha256() {
	case "$1" in
		tailwindcss-linux-x64) echo dc61b3ac6b8c9ca874c0cc4c57b2409791a64c5540404ca5f5367360babc313a ;;
		tailwindcss-linux-x64-musl) echo a04d34ceacc8f52cbe8920ad846cdeb61d3d0021dba32db0d1f77c9d9fad7a6c ;;
		tailwindcss-linux-arm64) echo 55fd0b241214eff3de1e8ee4f22796662f2d2e7a49bcfca7477cfd0bac398195 ;;
		tailwindcss-linux-arm64-musl) echo 71ea4be79c9de9827545682df3e040053fb535d37c71ed2cfdedf9385a0868e0 ;;
		tailwindcss-macos-x64) echo 7922e0953f2110c05976e3bf58f14e643d90427575e766b7d433f5f80cbee7e1 ;;
		tailwindcss-macos-arm64) echo cdf646702987a743464dff4d9c60fd4480d1c1e73dd819a9a67f1078815dce9d ;;
		daisyui.mjs) echo 85819d3fe86a852237b439b13f481481aac58e562ac47694cd11c3038e994f2a ;;
		daisyui-theme.mjs) echo d92d2f488933dab757f046e81ebd4986e51e9423307798dc3545d09a15542c89 ;;
		*) echo "tailwind.sh: no pinned checksum for $1" >&2; exit 1 ;;
	esac
}

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

tailwind_asset() {
	local os arch libc=""
	case "$(uname -s)" in
		Linux) os=linux ;;
		Darwin) os=macos ;;
		*) echo "tailwind.sh: unsupported OS $(uname -s)" >&2; exit 1 ;;
	esac
	case "$(uname -m)" in
		x86_64|amd64) arch=x64 ;;
		aarch64|arm64) arch=arm64 ;;
		*) echo "tailwind.sh: unsupported architecture $(uname -m)" >&2; exit 1 ;;
	esac
	if [ "$os" = linux ] && ldd --version 2>&1 | grep -qi musl; then libc=-musl; fi
	echo "tailwindcss-$os-$arch$libc"
}

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

# fetch_one <url> <destination> <expected sha256>
fetch_one() {
	local url="$1" dest="$2" expected="$3"
	if [ -f "$dest" ] && [ "$(sha256_of "$dest")" = "$expected" ]; then return; fi
	echo "tailwind.sh: downloading $url"
	curl -fsSL --retry 3 -o "$dest.part" "$url"
	local actual
	actual="$(sha256_of "$dest.part")"
	if [ "$actual" != "$expected" ]; then
		rm -f "$dest.part"
		echo "tailwind.sh: checksum mismatch for $url (expected $expected, got $actual)" >&2
		exit 1
	fi
	mv "$dest.part" "$dest"
}

fetch() {
	mkdir -p "$TOOLS"
	local asset
	asset="$(tailwind_asset)"
	fetch_one "https://github.com/tailwindlabs/tailwindcss/releases/download/v$TAILWIND_VERSION/$asset" \
		"$TAILWIND" "$(pinned_sha256 "$asset")"
	chmod +x "$TAILWIND"
	for f in daisyui.mjs daisyui-theme.mjs; do
		fetch_one "https://github.com/saadeghi/daisyui/releases/download/v$DAISYUI_VERSION/$f" "$TOOLS/$f" "$(pinned_sha256 "$f")"
	done
}

cd "$ROOT"
case "${1:-build}" in
	fetch) fetch ;;
	build) fetch; "$TAILWIND" -i Styles/app.css -o wwwroot/css/app.css --optimize ;;
	watch) fetch; exec "$TAILWIND" -i Styles/app.css -o wwwroot/css/app.css --watch ;;
	docs) mkdir -p "$TOOLS"; curl -fsSL -o "$TOOLS/llms.txt" https://daisyui.com/llms.txt; echo "$TOOLS/llms.txt" ;;
	*) echo "usage: tailwind.sh [fetch|build|watch|docs]" >&2; exit 2 ;;
esac