#!/usr/bin/env nix-shell
#!nix-shell -i bash -p curl jq sta -I nixpkgs=channel:nixpkgs-unstable

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

prs() {
	if [ -n "$1" ]; then
		after=", after: \"$1\""
	fi

	QUERY=$(cat <<-EOF
	{
		repository(name: "nixpkgs", owner: "NixOS") {
			pullRequests(first: 100, states: OPEN$after) {
				nodes {
					url
					createdAt
					mergeable
				}
				pageInfo {
					hasNextPage
					endCursor
				}
			}
		}
	}
	EOF
	)
	DATA=$(jq -n --arg query "$QUERY" '{ query : $query }')
	response=$(curl -sS -H "Authorization: token $TOKEN" -d "$DATA" https://api.github.com/graphql)
	#echo "$response"
	result=$(jq '.data.repository.pullRequests' <<< "$response")
	now=$(date +%s)
	echo "$result" | jq -cr '.nodes[]' | while read json; do
	  url=$(jq -r '.url' <<< "$json")
	  createdAt=$(jq -r '.createdAt' <<< "$json")
	  mergeable=$(jq -r '.mergeable' <<< "$json")
	  age=$(( now - $(date --date="$createdAt" +%s) ))
		if [ "$mergeable" != "CONFLICTING" ]; then
			echo "$age"
	  else
			echo "Skipping $url since it's conflicting (age $age)" >&2
		fi
	done
	if [ "$(echo "$result" | jq -r '.pageInfo.hasNextPage')" = true ]; then
		prs "$(echo "$result" | jq -r '.pageInfo.endCursor')"
	fi
}

prs | sta --median --mean