#!/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

# Install jq if it's not installed
if ! command -v jq &> /dev/null; then
    echo "Installing jq..."
    brew install jq
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.
output=$(system_profiler SPDisplaysDataType -json)
main_display=$(echo "$output" | jq '.SPDisplaysDataType[].spdisplays_ndrvs[] | select(.spdisplays_main == "spdisplays_yes")')
resolution=$(echo "$main_display" | jq -r '._spdisplays_resolution')
width=$(echo "$resolution" | jq -Rr 'match("(\\d+) x (\\d+)").captures[0].string')
half_width=$(($width / 2))
height=$(echo "$resolution" | jq -Rr 'match("(\\d+) x (\\d+)").captures[1].string')
y=0

position_1=0,${y}
position_2=${half_width},${y}

# 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=${half_width},${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