#!/usr/bin/make -sf
# to debug: make -f windows-iso-url v=1

user_agent := Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/134.0.0.0 Safari/537.36
SHELL := bash -o pipefail
session_id := $(shell uuidgen)

all: step6

check:; type uuidgen dialog curl nokogiri ruby > /dev/null

step0-windows.txt: check
	echo "https://www.microsoft.com/en-us/software-download/windows11" 11 \
	 "https://www.microsoft.com/en-us/software-download/windows10ISO" 10 | \
	$(call dialog,Select Windows version) 2>$@

step1-editions.html: step0-windows.txt; cat $< | xargs $(curl) > $@

# extract the list of editions, then a user selects 1 edition
step2-edition.txt: step1-editions.html
	nokogiri -e 'puts $$_.css("select#product-edition").children.select {|v| v.name == "option" && v["value"] != "null" }.map {|v| [v["value"], v.text.strip.shellescape]}.flatten.join " "' < $< | $(call dialog,Select edition) 2>$@

# fetch product languages
step3-lang.json: step2-edition.txt
# fetch some junk providing our session_id to the endpoint, otherwise
# we get 400 in subsequent requests
	$(curl) 'https://vlscppe.microsoft.com/fp/tags.js?org_id=y6jn8c31&session_id=$(session_id)' > /dev/null
	$(curl) "https://www.microsoft.com/software-download-connector/api/getskuinformationbyproductedition?profile=606624d44113&ProductEditionId=`cat $<`&Locale=en-US&sessionID=$(session_id)" > $@

# extract the list of languages, then the user selects 1 language
step4-lang.txt: step3-lang.json
	 ruby -rjson -rshellwords -e 'puts JSON.parse(STDIN.read).dig("Skus").map {|v| [v["Id"], v["Language"].shellescape]}.flatten.join " "' < $< | $(call dialog,Select languages) 2>$@

# fetch iso urls
step5-urls.json: step4-lang.txt
	$(curl) "https://www.microsoft.com/software-download-connector/api/GetProductDownloadLinksBySku?profile=606624d44113&SKU=`cat $<`&Locale=en-US&sessionID=$(session_id)" > $@

# extract iso urls
step6: step5-urls.json
	ruby -rjson -e 'j=JSON.parse(STDIN.read); e=j.dig("Errors", 0, "Value"); abort e.to_s if e; j.dig("ProductDownloadOptions").each {|v| puts v["Uri"]}' < $<

.DELETE_ON_ERROR:

dialog = xargs dialog --keep-tite --no-tags --menu "$1" 0 0 0
curl = curl -sf --referer "`cat step0-windows.txt`" -A '$(user_agent)'

ifndef v
.INTERMEDIATE: step0-windows.txt step1-editions.html step2-edition.txt step3-lang.json step4-lang.txt step5-urls.json
endif