<?php

$jira_base_url = "https://jira.someserver.com";
$username = "userName";
$password = "passWord! @#";
$project_key = "projectKey";

// 1. Pull a project's component list
$url = $jira_base_url . "/rest/api/2/project/$project_key/components";
$auth = base64_encode($username . ':' . $password);

$opts = [
    'http' => [
        'method' => 'GET',
        'header' => [
            "Content-Type: application/json",
            "Authorization: Basic $auth"
        ]
    ]
];

$context = stream_context_create($opts);
$raw_data = file_get_contents($url, false, $context);
$components = json_decode($raw_data);

// 2. Create a mapping of component ID, component name, and the assignee name
$component_data = [];
foreach ($components as $component) {
    $component_data[] = [
        'id' => $component->id,
        'name' => $component->name,
        'assignee' => $component->assignee->name
    ];
}

// 3. Show a comma-separated list of the usernames and ask which username we want to replace
$usernames = array_unique(array_column($component_data, 'assignee'));
echo "Usernames: " . implode(', ', $usernames) . PHP_EOL;
echo "Enter the username you want to replace: ";
$old_username = trim(fgets(STDIN));

// 4. Check if the entered username is in the list
if (!in_array($old_username, $usernames)) {
    echo "Username not found in the list. Please select a name from the list." . PHP_EOL;
    exit(1);
}

// 5. Ask for the new username
echo "Enter the new username: ";
$new_username = trim(fgets(STDIN));

// Create a folder for the source username and history.txt file
$history_folder = $old_username;
if (!file_exists($history_folder)) {
    mkdir($history_folder);
}
$history_file = $history_folder . "/history.txt";

// 6. Create a new mapping of the IDs and new assignees we will be changing
$components_to_update = [];
foreach ($component_data as $component) {
    if ($component['assignee'] === $old_username) {
        $components_to_update[] = $component;
    }
}

// 7. Push an update to the Jira Server API to update those component leads
foreach ($components_to_update as $component) {
    $component_id = $component['id'];
    $component_name = $component['name'];

    $url = $jira_base_url . "/rest/api/2/component/$component_id";
    $post_data = json_encode(["leadUserName" => $new_username]);

    $opts = [
        'http' => [
            'method' => 'PUT',
            'header' => [
                "Content-Type: application/json",
                "Authorization: Basic $auth"
            ],
            'content' => $post_data
        ]
    ];

    $context = stream_context_create($opts);
    file_get_contents($url, false, $context);

    // Save the changed component ID and timestamp to the history file
    $timestamp = date('Y-m-d H:i:s');
    $history_entry = "Updated component $component_name ($component_id) with new assignee $new_username at $timestamp" . PHP_EOL;
    file_put_contents($history_file, $history_entry, FILE_APPEND);
}

?>