#!/usr/bin/env bash
set -euo pipefail

REPO_ROOT="$(cd "$(dirname "$0")/.." && pwd)"
MANIFEST="${MANIFEST:-$REPO_ROOT/content/audio.yaml}"
SRC_DIR="${SRC_DIR:-$REPO_ROOT/content/images}"
OUT_DIR="${OUT_DIR:-$REPO_ROOT/web/static/images}"
MAX_SIZE="${MAX_SIZE:-1200}"
QUALITY="${QUALITY:-80}"

for tool in yq magick; do
	if ! command -v "$tool" >/dev/null; then
		echo "error: $tool not in PATH (try: nix develop)" >&2
		exit 1
	fi
done

mkdir -p "$OUT_DIR"

encoded=0
skipped=0
missing=0
failed=0

NUM_ARTISTS=$(yq '.artists | length' "$MANIFEST")

for ((a=0; a<NUM_ARTISTS; a++)); do
	ARTIST_SLUG=$(yq -r ".artists[$a].slug" "$MANIFEST")
	NUM_IMAGES=$(yq ".artists[$a].images | length // 0" "$MANIFEST")

	for ((i=0; i<NUM_IMAGES; i++)); do
		SRC_NAME=$(yq -r ".artists[$a].images[$i]" "$MANIFEST")
		SRC_PATH="$SRC_DIR/$SRC_NAME"
		OUT_NAME="${ARTIST_SLUG}-$((i + 1)).webp"
		OUT_PATH="$OUT_DIR/$OUT_NAME"

		if [[ ! -f "$SRC_PATH" ]]; then
			printf '  %-45s SKIP (source not found)\n' "$OUT_NAME"
			missing=$((missing + 1))
			continue
		fi

		if [[ -f "$OUT_PATH" ]]; then
			src_mt=$(stat -c %Y "$SRC_PATH")
			out_mt=$(stat -c %Y "$OUT_PATH")
			if (( out_mt > src_mt )); then
				printf '  %-45s up to date\n' "$OUT_NAME"
				skipped=$((skipped + 1))
				continue
			fi
		fi

		printf '  %-45s converting ...\n' "$OUT_NAME"

		if magick "$SRC_PATH" \
			-auto-orient \
			-strip \
			-resize "${MAX_SIZE}x${MAX_SIZE}>" \
			-quality "$QUALITY" \
			"$OUT_PATH"; then
			size=$(du -h "$OUT_PATH" | cut -f1)
			printf '  %-45s done (%s)\n' "$OUT_NAME" "$size"
			encoded=$((encoded + 1))
		else
			printf '  %-45s FAILED\n' "$OUT_NAME" >&2
			failed=$((failed + 1))
		fi
	done
done

printf '\n%d converted · %d up-to-date · %d missing sources · %d failed\n' \
	"$encoded" "$skipped" "$missing" "$failed"

if (( failed > 0 )); then
	exit 1
fi