#!/usr/bin/env bash
# https://help.github.com/en/github/authenticating-to-github/creating-a-personal-access-token-for-the-command-line
TOKEN=

QUERY=$(cat <<-EOF
{
	repository(name: "nixpkgs", owner: "NixOS") {
		pullRequests(last: 1, states: OPEN) {
			nodes {
				number
			}
		}
	}
}
EOF
)
DATA=$(jq -n --arg query "$QUERY" '{ query : $query }')
result=$(curl -sS -H "Authorization: token $TOKEN" -d "$DATA" https://api.github.com/graphql | jq '.data.repository.pullRequests.nodes[].number')
mapfile -t sequence < <(seq "$result" | shuf)

next() {
	candidates=( "${sequence[@]:$1:100}" )

	QUERY=$(
		echo '{ repository(name: "nixpkgs", owner: "NixOS") {'
		for candidate in "${candidates[@]}"; do
			echo "n$candidate: issueOrPullRequest(number: $candidate) { ... on PullRequest { url state } }"
		done
		echo '} }'
	)
}

randompr() {
	next "$1"
	DATA=$(jq -n --arg query "$QUERY" '{ query : $query }')
	result=$(curl -sS -H "Authorization: token $TOKEN" -d "$DATA" https://api.github.com/graphql \
		| jq -r '.data.repository[] | select(.state == "OPEN") | .url' | head -1)

	if [ -z "$result" ]; then
		randompr "$(( $1 + 100 ))"
	else
		echo "$result"
	fi
}

xdg-open "$(randompr 0)"