#!/usr/bin/env nix-shell
#! nix-shell -i bash -p curl gnused

set -eou pipefail

latest_linux_data="$(curl -s 'https://slack.com/api/desktop.latestRelease?arch=x64&variant=deb')"
latest_mac_data="$(curl -s 'https://slack.com/api/desktop.latestRelease?arch=universal&variant=dmg')"
latest_mac_arm_data="$(curl -s 'https://slack.com/api/desktop.latestRelease?arch=arm64&variant=dmg')"

latest_linux_version="$(echo ${latest_linux_data} | jq -rc '.version')"
latest_mac_version="$(echo ${latest_mac_data} | jq -rc '.version')"
latest_mac_arm_version="$(echo ${latest_mac_arm_data} | jq -rc '.version')"

nixpkgs="$(git rev-parse --show-toplevel)"
slack_nix="$nixpkgs/pkgs/by-name/sl/slack/package.nix"
nixpkgs_linux_version=$(cat "$slack_nix" | sed -n 's/.*x86_64-linux-version = \"\([0-9\.]\+\)\";.*/\1/p')
nixpkgs_mac_version=$(cat "$slack_nix" | sed -n 's/.*x86_64-darwin-version = \"\([0-9\.]\+\)\";.*/\1/p')
nixpkgs_mac_arm_version=$(cat "$slack_nix" | sed -n 's/.*aarch64-darwin-version = \"\([0-9\.]\+\)\";.*/\1/p')

if [[ "$nixpkgs_linux_version" == "$latest_linux_version" && \
      "$nixpkgs_mac_version" == "$latest_mac_version" && \
      "$nixpkgs_mac_arm_version" == "$latest_mac_version" ]]; then
  echo "nixpkgs versions are all up to date!"
  exit 0
fi

linux_url="$(echo ${latest_linux_data} | jq -rc '.download_url')"
mac_url="$(echo ${latest_mac_data} | jq -rc '.download_url')"
mac_arm_url="$(echo ${latest_mac_arm_data} | jq -rc '.download_url')"
linux_sha256=$(nix-prefetch-url ${linux_url})
mac_sha256=$(nix-prefetch-url ${mac_url})
mac_arm_sha256=$(nix-prefetch-url ${mac_arm_url})

sed -i "s/x86_64-linux-version = \".*\"/x86_64-linux-version = \"${latest_linux_version}\"/" "$slack_nix"
sed -i "s/x86_64-darwin-version = \".*\"/x86_64-darwin-version = \"${latest_mac_version}\"/" "$slack_nix"
sed -i "s/aarch64-darwin-version = \".*\"/aarch64-darwin-version = \"${latest_mac_version}\"/" "$slack_nix"
sed -i "s/x86_64-linux-sha256 = \".*\"/x86_64-linux-sha256 = \"${linux_sha256}\"/" "$slack_nix"
sed -i "s/x86_64-darwin-sha256 = \".*\"/x86_64-darwin-sha256 = \"${mac_sha256}\"/" "$slack_nix"
sed -i "s/aarch64-darwin-sha256 = \".*\"/aarch64-darwin-sha256 = \"${mac_arm_sha256}\"/" "$slack_nix"

if ! nix-build -A slack "$nixpkgs" --arg config '{ allowUnfree = true; }'; then
  echo "The updated slack failed to build."
  exit 1
fi

echo "Successfully updated"
echo "slack: $nixpkgs_linux_version -> $latest_linux_version"