#!/usr/bin/env bash

set -euo pipefail

timestamp() {
    date "+%Y-%m-%dT%H:%M:%S%z"
}

log() {
    echo "[$(timestamp)]" "$@"
}

notify() {
    title="$1"
    body="$2"
    log "${body}"
    notify-send "${title}" "${body}"
}

prompt_continue() {
    read -rp 'Press ENTER to continue > '
}

default_workflow() {
    root=$(git rev-parse --show-toplevel)
    cat "${root}/.gh-autosquash-default-workflow"
}

branch="${1-$(git symbolic-ref --short HEAD)}"
workflow="${2-$(default_workflow)}"

data=$(gh pr view "${branch}" --json 'body,number,title')
body=$(jq -r '.body' <<< "${data}")
number=$(jq -r '.number' <<< "${data}")
title=$(jq -r '.title' <<< "${data}")

log "Squash-merging PR #${number}: ${branch}"

# Use the commit title and description as the commit message by default.
commit_title=$(vipe <<< "${title} (#${number})"); unset title
commit_message=$(vipe <<< "${body}"); unset body

log "Waiting for workflow: ${workflow}"

gh run list \
    --branch "${branch}" \
    --workflow "${workflow}" \
    --json 'status,databaseId' \
    --jq '.[] | select(.status != "completed") | .databaseId' \
    | xargs -n 1 gh run watch

notify "${branch}" 'Workflow complete!'

log "Confirming squash-merge for ${branch} (#${number})"
echo ''
echo '|------------------------------------------------------------------------------|-------------------|'
echo "${commit_title}"
echo ''
echo "${commit_message}"
echo '|------------------------------------------------------------------------------|-------------------|'
echo ''

prompt_continue

gh pr merge "${branch}" \
    --squash \
    --delete-branch \
    --subject "${commit_title}" \
    --body "${commit_message}"

notify "${branch}" 'PR merged!'