<?php
/**
 * Spacetraders ship purchasing page.
 *
 * @package  SpacetradersAPI
 * @author   Keith Solomon <keith@keithsolomon.net>
 * @license  MIT License
 * @version  GIT: <git_id>
 * @link     https://git.keithsolomon.net/keith/Spacetraders
 */

require_once __DIR__ . '/lib/spacetraders-api.php';
require_once __DIR__ . '/lib/spacetraders-storage.php';

$config = require __DIR__ . '/lib/project-config.php';

$storage = new SpacetradersStorage( $config['db_path'] );
$token   = $storage->getAgentToken();

$statusMessage       = '';
$errorMessage        = '';
$ships               = array();
$shipyards           = array();
$agent               = array();
$currentSystemSymbol = '';

if (! is_string( $token ) || trim( $token ) === '' ) {
    $envToken = getenv( 'SPACETRADERS_TOKEN' );

    if (is_string( $envToken ) && trim( $envToken ) !== '' ) {
        $token = trim( $envToken );
        $storage->setAgentToken( $token );
    }
}

if (! is_string( $token ) || trim( $token ) === '' ) {
    $tokenError = 'No token found. Set one in config.php or SPACETRADERS_TOKEN.';
}

if (! isset( $tokenError ) ) {
    $client = new SpacetradersApi(
        trim( $token ),
        $config['api_base_url'],
        (int) $config['api_timeout'],
        $storage,
        (int) $config['cache_ttl']
    );
}

try {
    if (! isset( $tokenError ) ) {
        if ($_SERVER['REQUEST_METHOD'] === 'POST' && isset( $_POST['ship_type'] ) && isset( $_POST['waypoint_symbol'] )) {
            $shipType       = trim( (string) $_POST['ship_type'] );
            $waypointSymbol = trim( (string) $_POST['waypoint_symbol'] );

            if ($shipType !== '' && $waypointSymbol !== '' ) {
                $purchaseResponse = $client->purchaseShip( $shipType, $waypointSymbol );
                $shipSymbol       = (string) ( $purchaseResponse['data']['ship']['symbol'] ?? '' );
                $storage->clearAllCache();
                $statusMessage = 'Purchased ' . $shipType . ( $shipSymbol !== '' ? ' (' . $shipSymbol . ')' : '' ) . '.';
            }
        }

        $agentResponse = $client->getMyAgent();
        $shipsResponse = $client->listMyShips();

        $agent = $agentResponse['data'] ?? $agentResponse;
        $ships = $shipsResponse['data'] ?? $shipsResponse;

        if (isset( $ships[0]['nav']['systemSymbol'] ) && is_string( $ships[0]['nav']['systemSymbol'] ) ) {
            $currentSystemSymbol = $ships[0]['nav']['systemSymbol'];
        }

        if ($currentSystemSymbol === '' && isset( $agent['headquarters'] ) && is_string( $agent['headquarters'] ) ) {
            $hqParts = explode( '-', $agent['headquarters'] );
            if (count( $hqParts ) >= 2 ) {
                $currentSystemSymbol = $hqParts[0] . '-' . $hqParts[1];
            }
        }

        if ($currentSystemSymbol !== '' ) {
            $page = 1;
            $total = 0;
            $waypoints = array();
            do {
                $waypointsResponse = $client->listWaypoints(
                    $currentSystemSymbol,
                    array(
                        'page'  => $page,
                        'limit' => 20,
                    )
                );
                $pageData = $waypointsResponse['data'] ?? array();
                if (! is_array( $pageData ) || empty( $pageData ) ) {
                    break;
                }

                $waypoints = array_merge( $waypoints, $pageData );
                $total = (int) ( $waypointsResponse['meta']['total'] ?? count( $waypoints ) );
                $page++;
            } while (count( $waypoints ) < $total);

            foreach ( $waypoints as $waypoint ) {
                $traits = $waypoint['traits'] ?? array();
                $hasShipyard = false;
                foreach ( $traits as $trait ) {
                    if ((string) ( $trait['symbol'] ?? '' ) === 'SHIPYARD' ) {
                        $hasShipyard = true;
                        break;
                    }
                }

                if (! $hasShipyard ) {
                    continue;
                }

                $waypointSymbol = (string) ( $waypoint['symbol'] ?? '' );
                $record = array(
                    'waypoint'  => $waypoint,
                    'shipTypes' => array(),
                    'prices'    => array(),
                    'error'     => '',
                );

                try {
                    $shipyardResponse = $client->getWaypointShipyard( $currentSystemSymbol, $waypointSymbol );
                    $shipyardData     = $shipyardResponse['data'] ?? array();
                    $record['shipTypes'] = (array) ( $shipyardData['shipTypes'] ?? array() );

                    $transactions = (array) ( $shipyardData['transactions'] ?? array() );
                    foreach ( $transactions as $transaction ) {
                        $shipType = (string) ( $transaction['shipType'] ?? '' );
                        $price    = (int) ( $transaction['price'] ?? 0 );
                        if ($shipType !== '' && $price > 0 && ! isset( $record['prices'][ $shipType ] ) ) {
                            $record['prices'][ $shipType ] = $price;
                        }
                    }
                } catch (SpacetradersApiException $e) {
                    $record['error'] = $e->getMessage();
                }

                $shipyards[] = $record;
            }
        }
    }
} catch (SpacetradersApiException $e) {
    $errorMessage = $e->getMessage();
}
?>

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Spacetraders - Buy Ships</title>

    <script src="https://cdn.tailwindcss.com"></script>
</head>

<body class="container mx-auto px-4 py-8 bg-stone-800 text-gray-200">
    <?php require __DIR__ . '/main-menu.php'; ?>

    <h1 class="text-3xl font-bold mb-6 underline decoration-gray-300 w-full"><a href="buy-ships.php">Spacetraders - Buy Ships</a></h1>

    <?php if (isset( $tokenError ) ) : ?>
        <div class="mb-6 border border-red-500 p-4 rounded text-red-300">
            <?php echo htmlspecialchars( $tokenError ); ?>
        </div>
        </body>
        </html>
        <?php exit; ?>
    <?php endif; ?>

    <?php if ($statusMessage !== '' ) : ?>
        <div class="mb-6 border border-green-500 p-4 rounded text-green-300">
            <?php echo htmlspecialchars( $statusMessage ); ?>
        </div>
    <?php endif; ?>

    <?php if ($errorMessage !== '' ) : ?>
        <div class="mb-6 border border-red-500 p-4 rounded text-red-300">
            <?php echo htmlspecialchars( $errorMessage ); ?>
        </div>
    <?php endif; ?>

    <p class="mb-6">
        Credits: <span class="font-semibold"><?php echo number_format( (int) ( $agent['credits'] ?? 0 ) ); ?></span>
        <?php if ($currentSystemSymbol !== '' ) : ?>
            | Current System: <span class="font-semibold"><?php echo htmlspecialchars( $currentSystemSymbol ); ?></span>
        <?php endif; ?>
    </p>

    <?php if (empty( $shipyards ) ) : ?>
        <div class="border border-gray-600 p-4 rounded">
            No shipyards were found in your current system.
        </div>
    <?php endif; ?>

    <?php foreach ( $shipyards as $shipyard ) : ?>
        <div class="mb-6 border border-gray-600 p-4 rounded">
            <h2 class="text-2xl font-bold mb-3">
                Shipyard: <?php echo htmlspecialchars( (string) ( $shipyard['waypoint']['symbol'] ?? '' ) ); ?>
            </h2>

            <?php if ((string) $shipyard['error'] !== '' ) : ?>
                <p class="text-red-300"><?php echo htmlspecialchars( (string) $shipyard['error'] ); ?></p>
            <?php else : ?>
                <table class="table-auto border-collapse border border-gray-300 w-full">
                    <tr>
                        <th class="border border-gray-300 px-4 py-2">Ship Type</th>
                        <th class="border border-gray-300 px-4 py-2">Known Price</th>
                        <th class="border border-gray-300 px-4 py-2">Action</th>
                    </tr>
                    <?php foreach ( (array) $shipyard['shipTypes'] as $shipTypeRecord ) : ?>
                        <?php $shipType = (string) ( $shipTypeRecord['type'] ?? '' ); ?>
                        <?php $knownPrice = (int) ( $shipyard['prices'][ $shipType ] ?? 0 ); ?>
                        <tr>
                            <td class="border border-gray-300 px-4 py-2"><?php echo htmlspecialchars( $shipType ); ?></td>
                            <td class="border border-gray-300 px-4 py-2">
                                <?php echo $knownPrice > 0 ? number_format( $knownPrice ) : 'Unknown'; ?>
                            </td>
                            <td class="border border-gray-300 px-4 py-2">
                                <form method="post" class="inline">
                                    <input type="hidden" name="ship_type" value="<?php echo htmlspecialchars( $shipType ); ?>">
                                    <input type="hidden" name="waypoint_symbol" value="<?php echo htmlspecialchars( (string) ( $shipyard['waypoint']['symbol'] ?? '' ) ); ?>">
                                    <button type="submit" class="px-3 py-1 bg-blue-600 rounded hover:bg-blue-500">Buy</button>
                                </form>
                            </td>
                        </tr>
                    <?php endforeach; ?>
                </table>
            <?php endif; ?>
        </div>
    <?php endforeach; ?>
</body>
</html>