#!/bin/bash
# Copyright (C) 2025-2026	MDW	<mdeweerd@users.noreply.github.com>

# shellcheck disable=2129,2128,2034,2016

set -euo pipefail

# This script retrieves the list of changed PHP files for a pull request
# using the GitHub API and sets two outputs:
#   - any_changed: "true" if at least one PHP file changed, "false" otherwise
#   - all_changed_files: space-separated list of changed PHP file paths
#
# Required environment variables:
#   GITHUB_TOKEN      - GitHub token with repo access
#   GITHUB_REPOSITORY - "owner/repo"
#   GITHUB_EVENT_PATH - Path to the event JSON payload

# Verify required environment variables are set
if [[ -z "${GITHUB_TOKEN:-}" ]]; then
	echo "GITHUB_TOKEN is not set" >&2
	exit 1
fi
if [[ -z "${GITHUB_REPOSITORY:-}" ]]; then
	echo "GITHUB_REPOSITORY is not set" >&2
	exit 2
fi
if [[ -z "${GITHUB_EVENT_PATH:-}" ]]; then
	echo "GITHUB_EVENT_PATH is not set" >&2
	exit 3
fi

# Extract the pull request number from the event payload
pr_number=$(jq --raw-output '.pull_request.number' "$GITHUB_EVENT_PATH")
if [[ "$pr_number" == "null" ]]; then
	echo "Not a pull request event"
	exit 0
fi

# Split repository into owner and repo name using Bash parameter expansion
owner="${GITHUB_REPOSITORY%%/*}"  # Extract text before the first '/'
repo="${GITHUB_REPOSITORY##*/}"   # Extract text after the last '/'

page=1
per_page=100
changed_php_files=()
changed_phan_files=()
changed_lang_files=()

# Get phan path configuration
phan_directory_list=$(php -r '$config = require("dev/tools/phan/config.php"); echo "^".implode("|",$config["directory_list"]);')
phan_exclude_directory=$(php -r '$config = require("dev/tools/phan/config.php"); echo "^".implode("|",$config["exclude_analysis_directory_list"]);')

phan_exclude_file_regex=$(php -r '$config = require("dev/tools/phan/config.php"); echo $config["exclude_file_regex"];')
phan_exclude_file_regex=${phan_exclude_file_regex#@}
phan_exclude_file_regex=${phan_exclude_file_regex%@}

# Loop through all pages to gather changed files
while true; do
	response=$(curl -s -H "Authorization: token ${GITHUB_TOKEN}" \
		"https://api.github.com/repos/${owner}/${repo}/pulls/${pr_number}/files?per_page=${per_page}&page=${page}")



	# Filter for files ending with .php and add them to the list
	mapfile -t files < <(echo "$response" | jq -r '.[] | select((.filename | test("\\.php$")) and (.filename | test("^dev/") | not)) | .filename')
	changed_php_files+=("${files[@]}")

	mapfile -t files < <(echo "$response" | jq -r '.[] | select((.filename | test("\\.php$")) and (.filename | test("'"$phan_directory_list"'"))) | .filename' | grep -vP "$phan_exclude_file_regex")
	changed_phan_files+=("${files[@]}")

	mapfile -t files < <(echo "$response" | jq -r '.[] | select(.filename | test("\\.lang$")) | .filename')
	changed_lang_files+=("${files[@]}")

	# Check if we have reached the last page (less than per_page results)
	count=$(echo "$response" | jq 'length')
	if (( count < per_page )); then
		break
	fi
	((page++))
done


# Build a space-separated string of changed PHP and lang files
# This does not cope with files that have spaces.

# But such files do not exist in the project (at least not for the
# files we are filtering).
all_changed_files=$(IFS=" " ; echo "${changed_php_files[*]}")
all_changed_lang=$(IFS=" " ; echo "${changed_lang_files[*]}")
phan_changed_files=$(IFS=" " ; echo "${changed_phan_files[*]}")


forbidden_files=""
#forbidden_files=$(echo "$all_changed_lang" | grep -E 'htdocs/langs/([^/]+)/.*\.lang$' | grep -v 'htdocs/langs/en_US/')
#if [ -n "$forbidden_files" ]; then
#  echo "You tried to modify one or more language files that are not allowed to be modified in Pull requests."
#  echo "$forbidden_files"
#  echo "To modify translations that are not the source language (en_US), you must modify them from transifex.com"
#  exit 10
#fi


# Determine changed files flags
if [ -z "${all_changed_files}" ]; then
    any_changed="false"
else
    any_changed="true"
fi

if [ -z "${phan_changed_files}" ]; then
    phan_changed="false"
else
    phan_changed="true"
fi

# Set outputs for GitHub Actions if GITHUB_OUTPUT is available
if [ -n "${GITHUB_OUTPUT:-}" ]; then
	echo "any_changed=${any_changed}" >> "$GITHUB_OUTPUT"
	echo "phan_changed=${phan_changed}" >> "$GITHUB_OUTPUT"
	echo "all_changed_files=${all_changed_files}" >> "$GITHUB_OUTPUT"
	echo "phan_changed_files=${phan_changed_files[*]}" >> "$GITHUB_OUTPUT"
	echo "forbidden_files=${forbidden_files}" >> "$GITHUB_OUTPUT"
else
	# Otherwise, print the outputs
	echo "any_changed=${any_changed}"
	echo "phan_changed=${phan_changed}"
	echo "phan_changed_files=${phan_changed_files[*]}"
	echo "all_changed_files=${all_changed_files}"
	echo "forbidden_files=${forbidden_files}"
fi