#!/bin/bash

set -e

if [[ -z "$GITHUB_TOKEN" ]]; then
  cat <<-MESSAGE
Missing \`GITHUB_TOKEN\` environment variable. This token is needed
for fetching your GitHub identity from the command-line.

Create an access token here: https://github.com/settings/tokens
Then edit your \`~/.zshrc\` (or other shell initialization script),
adding a line like this:

    export GITHUB_TOKEN="(the token)"

MESSAGE
  exit 1
fi

# Start one Zed instance as the current user and a second instance with a different user.
username_1=$(curl -sH "Authorization: bearer $GITHUB_TOKEN" https://api.github.com/user | jq -r .login)
username_2=nathansobo
if [[ $username_1 == $username_2 ]]; then
  username_2=as-cii
fi

# Make each Zed instance take up half of the screen.
resolution_line=$(system_profiler SPDisplaysDataType | grep Resolution | head -n1)
screen_size=($(echo $resolution_line | egrep -o '[0-9]+'))
scale_factor=1
if [[ $resolution_line =~ Retina ]]; then scale_factor=2; fi
width=$(expr ${screen_size[0]} / 2 / $scale_factor)
height=${screen_size[1] / $scale_factor}

position_1=0,0
position_2=${width},0

# Authenticate using the collab server's admin secret.
export ZED_STATELESS=1
export ZED_ADMIN_API_TOKEN=secret
export ZED_SERVER_URL=http://localhost:8080
export ZED_WINDOW_SIZE=${width},${height}

cargo build
sleep 0.5

# Start the two Zed child processes. Open the given paths with the first instance.
trap "trap - SIGTERM && kill -- -$$" SIGINT SIGTERM EXIT
ZED_IMPERSONATE=${username_1} ZED_WINDOW_POSITION=${position_1} target/debug/Zed $@ &
ZED_IMPERSONATE=${username_2} ZED_WINDOW_POSITION=${position_2} target/debug/Zed &
wait