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#!/bin/sh
set -eu

mkdir -p static/preview static/thumbnail

resize() {
	local photo=$1 size=$2 output=$3
	if ! test -f $output; then
		# FIXME: convert complains about not understanding XML
		echo $output >&2
		convert $photo -auto-orient -thumbnail $size $output 2>/dev/null ||:
	fi
}

preview() {
	local photo=$1
	local preview=preview/${photo##*/}
	resize $photo 25% static/$preview
	echo $preview
}

thumbnail() {
	local photo=$1
	local thumbnail=thumbnail/${photo##*/}
	resize $photo 5% static/$thumbnail
	echo $thumbnail
}

encode() {
	sed '
		s/&/\&/g
		s/</\&lt;/g
		s/"/\&quot;/g
	' "$@"
}

page_title() {
	date -j -f '%F' $1 '+%B %e, %Y'
}

page_head() {
	local date=$1
	local title=$(page_title $date)
	cat <<-EOF
	<!DOCTYPE html>
	<meta charset="utf-8">
	<meta name="viewport" content="width=device-width, initial-scale=1.0">
	<title>${title}</title>
	<style>
	html { color: #bbb; background-color: black; font-family: sans-serif; }
	figure { margin: 1em; padding-top: 0.5em; text-align: center; }
	img { max-width: calc(100vw - 2.5em); max-height: calc(100vh - 2.5em); }
	details { max-width: 78ch; margin: 0.5em auto; }
	</style>
	<h1>${title}</h1>
	EOF
}

photo_info() {
	local photo=$1
	ExposureTime=
	FNumber=
	FocalLength=
	PhotographicSensitivity=
	eval $(
		identify -format '%[EXIF:*]' $photo 2>/dev/null |
		grep -E 'ExposureTime|FNumber|FocalLength|PhotographicSensitivity' |
		sed 's/^exif://'
	)
}

photo_id() {
	local photo=$1
	photo=${photo##*/}
	photo=${photo%%.*}
	echo $photo
}

page_photo() {
	local photo=$1 preview=$2 description=$3
	if ! test -f $description; then
		description=/dev/null
	fi
	photo_info $photo
	cat <<-EOF
	<figure id="$(photo_id $photo)">
		<a href="${photo##*/}">
			<img src="../${preview}" alt="$(encode $description)">
		</a>
		<figcaption>
			${ExposureTime} ·
			ƒ/$(bc -S 1 -e ${FNumber}) ·
			$(bc -e ${FocalLength}) mm ·
			${PhotographicSensitivity} ISO
			<details>
				<summary>description</summary>
				$(encode $description)
			</details>
		</figcaption>
	</figure>
	EOF
}

index_head() {
	cat <<-EOF
	<!DOCTYPE html>
	<meta charset="utf-8">
	<meta name="viewport" content="width=device-width, initial-scale=1.0">
	<title>Photos</title>
	<style>
	html { color: #bbb; background-color: black; font-family: sans-serif; }
	a { text-decoration: none; color: inherit; }
	</style>
	EOF
}

index_page() {
	local date=$1
	cat <<-EOF
	<h1><a href="${date}/">$(page_title $date)</a></h1>
	EOF
}

index_photo() {
	local date=$1 photo=$2 thumbnail=$3
	cat <<-EOF
	<a href="${date}/#$(photo_id $photo)"><img src="${thumbnail}"></a>
	EOF
}

set --
for date in 20*; do
	mkdir -p static/${date}
	page=static/${date}/index.html
	if ! test -f $page; then
		echo $page >&2
		page_head $date >$page
		for photo in ${date}/*.JPG; do
			preview=$(preview $photo)
			if ! test -f static/${photo}; then
				ln $photo static/${photo}
			fi
			page_photo $photo $preview ${photo%.JPG}.txt >>$page
		done
	fi
	set -- $date "$@"
done

echo static/index.html >&2
index_head >static/index.html
for date; do
	index_page $date >>static/index.html
	for photo in ${date}/*.JPG; do
		thumbnail=$(thumbnail $photo)
		index_photo $date $photo $thumbnail >>static/index.html
	done
done