#!/bin/bash
set -e

cd $(dirname $0)/..

BUILD_DEBUG="${BUILD_DEBUG:-}"
if [[ -n "${BUILD_DEBUG}" ]]; then
    set -x
    env
fi

if [[ -n "$DRONE_TAG" ]]; then
    echo "Build has been triggered by a tag. Skipping gate"
    exit 0
fi 

if [[ -z "$DRONE_BRANCH" ]]; then 
    echo "No branch detected. Skipping gate"
    exit 0
fi

if [[ -z "$DRONE_REPO" ]]; then 
    echo "No repository detected. Unable to gate"
    exit 1
fi

if [[ -z "$DRONE_COMMIT" ]]; then 
    echo "No commit detected. Unable to gate"
    exit 1
fi

echo "Repo: $DRONE_REPO"
echo "Branch: $DRONE_BRANCH"
echo "Build Commit: $DRONE_COMMIT"

tmp=$(mktemp -u)
STATUS_CODE=$(curl -w "%{http_code}" -s -o $tmp https://api.github.com/repos/$DRONE_REPO/branches/$DRONE_BRANCH)

if [ "$STATUS_CODE" == "403" ]; then
    RATE_LIMIT_REMAINING=$(curl -s https://api.github.com/rate_limit | ./scripts/jq-nano - rate remaining)
    echo "Remaining GITHUB requests available: $RATE_LIMIT_REMAINING"
    RATE_LIMIT_REMAINING=${RATE_LIMIT_REMAINING:-0}
    if ((RATE_LIMIT_REMAINING < 1)); then
        echo "Github Rate Limit has been hit, skipping gate"
        exit 0
    fi
    # Fall through to the normal path like any other failed status code
fi

LATEST_BRANCH_COMMIT=$(cat $tmp | ./scripts/jq-nano - commit sha)
rm $tmp
echo "Latest Branch Commit: $LATEST_BRANCH_COMMIT"
if [ -z "$LATEST_BRANCH_COMMIT" ]; then
    echo "Unable to determine latest commit, failing gate"
    exit 1
fi

if [ "$LATEST_BRANCH_COMMIT" == "$DRONE_COMMIT" ]; then
    echo "Build was created from latest commit, passed upload gate"
else
    echo "Build was not created from latest commit, failing gate"
    exit 1
fi