#!/bin/bash

set -eu -o pipefail

# Pre-flight checks - verify all required tools are available and configured
# before making any changes to the repository

check_command() {
    if ! command -v "$1" &>/dev/null; then
        echo "Error: $1 is not installed or not in PATH"
        exit 1
    fi
}

# Verify gh CLI is authenticated
if ! gh auth status &>/dev/null; then
    echo "Error: gh CLI is not authenticated. Run 'gh auth login' first."
    exit 1
fi

# Verify we can access this repository via gh
if ! gh repo view --json name &>/dev/null; then
    echo "Error: Cannot access repository via gh. Check your authentication and repository access."
    exit 1
fi

# Verify git can connect to the remote (catches SSH key issues, etc.)
if ! git ls-remote origin &>/dev/null; then
    echo "Error: Cannot connect to git remote. Check your git credentials/SSH keys."
    exit 1
fi

check_command php

# Check that we're not on the main branch
current_branch=$(git branch --show-current)
if [ "$current_branch" = "main" ]; then
    echo "Error: Releases should not be done directly on the main branch."
    echo "Please create a release branch and run this script from there."
    exit 1
fi

# Fetch latest changes and check that we're not behind origin/main
echo "Fetching from origin..."
git fetch origin

if ! git merge-base --is-ancestor origin/main HEAD; then
    echo "Error: Current branch is behind origin/main."
    echo "Please merge or rebase with origin/main before releasing."
    exit 1
fi

changelog=$(cat CHANGELOG.md)

regex='
([0-9]+\.[0-9]+\.[0-9]+(-[a-zA-Z0-9.]+)?) \(([0-9]{4}-[0-9]{2}-[0-9]{2})\)
-*

((.|
)*)
'

if [[ ! $changelog =~ $regex ]]; then
    echo "Could not find date line in change log!"
    exit 1
fi

version="${BASH_REMATCH[1]}"
date="${BASH_REMATCH[3]}"
notes="$(echo "${BASH_REMATCH[4]}" | sed -n -E '/^[0-9]+\.[0-9]+\.[0-9]+(-[a-zA-Z0-9.]+)?/,$!p')"

if [[ "$date" != "$(date +"%Y-%m-%d")" ]]; then
    echo "$date is not today!"
    exit 1
fi

tag="v$version"

if [ -n "$(git status --porcelain)" ]; then
    echo ". is not clean." >&2
    exit 1
fi

php composer.phar self-update
php composer.phar update

./vendor/bin/phpunit

echo "Release notes for $tag:"
echo "$notes"

read -r -e -p "Commit changes and push to origin? " should_push

if [ "$should_push" != "y" ]; then
    echo "Aborting"
    exit 1
fi

git push

gh release create --target "$(git branch --show-current)" -t "$version" -n "$notes" "$tag"