<?php
/**
 * Spacetraders cargo shop 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          = '';
$agent                 = array();
$ships                 = array();
$stationedShips        = array();
$selectedShipSymbol    = '';
$selectedShip          = array();
$selectedMarketData    = array();
$selectedMarketError   = '';
$selectedSystemSymbol  = '';
$selectedWaypointSymbol = '';
$preferredWaypoint     = trim( (string) ( $_GET['waypoint'] ?? '' ) );

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

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

        foreach ( $ships as $ship ) {
            $status = (string) ( $ship['nav']['status'] ?? '' );
            if ($status === 'IN_TRANSIT' ) {
                continue;
            }

            $stationedShips[] = $ship;
        }

        $selectedShipSymbol = trim( (string) ( $_POST['ship_symbol'] ?? '' ) );
        if ($selectedShipSymbol === '' ) {
            $selectedShipSymbol = trim( (string) ( $_GET['ship'] ?? '' ) );
        }

        if ($selectedShipSymbol === '' && $preferredWaypoint !== '' ) {
            foreach ( $stationedShips as $stationedShip ) {
                $waypointSymbol = (string) ( $stationedShip['nav']['waypointSymbol'] ?? '' );
                if ($waypointSymbol === $preferredWaypoint ) {
                    $selectedShipSymbol = (string) ( $stationedShip['symbol'] ?? '' );
                    break;
                }
            }
        }

        if ($selectedShipSymbol === '' && ! empty( $stationedShips ) ) {
            $selectedShipSymbol = (string) ( $stationedShips[0]['symbol'] ?? '' );
        }

        if ($_SERVER['REQUEST_METHOD'] === 'POST' && isset( $_POST['buy_cargo'] ) ) {
            $selectedShipSymbol = trim( (string) ( $_POST['ship_symbol'] ?? '' ) );
            $tradeSymbol = trim( (string) ( $_POST['trade_symbol'] ?? '' ) );
            $units = (int) ( $_POST['units'] ?? 0 );

            if ($selectedShipSymbol === '' || $tradeSymbol === '' || $units <= 0 ) {
                throw new SpacetradersApiException( 'Ship, trade symbol, and units are required.' );
            }

            $selectedShipResponse = $client->getShip( $selectedShipSymbol );
            $selectedShipData = $selectedShipResponse['data'] ?? array();
            $shipStatus = (string) ( $selectedShipData['nav']['status'] ?? '' );

            if ($shipStatus === 'IN_TRANSIT' ) {
                throw new SpacetradersApiException( 'Selected ship is currently in transit.' );
            }

            if ($shipStatus !== 'DOCKED' ) {
                $client->dockShip( $selectedShipSymbol );
            }

            $client->purchaseCargo( $selectedShipSymbol, $tradeSymbol, $units );
            $storage->clearAllCache();
            $statusMessage = 'Purchased ' . number_format( $units ) . ' units of ' . $tradeSymbol . '.';

            $shipsResponse = $client->listMyShips();
            $ships = $shipsResponse['data'] ?? $shipsResponse;
            $stationedShips = array();
            foreach ( $ships as $ship ) {
                $status = (string) ( $ship['nav']['status'] ?? '' );
                if ($status === 'IN_TRANSIT' ) {
                    continue;
                }
                $stationedShips[] = $ship;
            }
        }

        if ($selectedShipSymbol !== '' ) {
            $selectedShipResponse = $client->getShip( $selectedShipSymbol );
            $selectedShip = $selectedShipResponse['data'] ?? array();
            $selectedSystemSymbol = (string) ( $selectedShip['nav']['systemSymbol'] ?? '' );
            $selectedWaypointSymbol = (string) ( $selectedShip['nav']['waypointSymbol'] ?? '' );

            if ($selectedSystemSymbol !== '' && $selectedWaypointSymbol !== '' ) {
                try {
                    $marketResponse = $client->getWaypointMarket( $selectedSystemSymbol, $selectedWaypointSymbol );
                    $selectedMarketData = (array) ( $marketResponse['data'] ?? array() );
                } catch (SpacetradersApiException $e) {
                    $selectedMarketError = $e->getMessage();
                }
            }
        }
    }
} 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 - Shop</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="shop.php">Spacetraders - Shop</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; ?>

    <form method="post" class="mb-6 border border-gray-600 rounded p-4 flex flex-wrap items-end gap-3">
        <div>
            <label for="ship_symbol" class="block text-sm mb-1">Ship</label>
            <select id="ship_symbol" name="ship_symbol" class="px-3 py-2 rounded text-black min-w-64">
                <?php foreach ( $stationedShips as $ship ) : ?>
                    <?php
                    $shipSymbol = (string) ( $ship['symbol'] ?? '' );
                    $shipWaypoint = (string) ( $ship['nav']['waypointSymbol'] ?? '' );
                    ?>
                    <option value="<?php echo htmlspecialchars( $shipSymbol ); ?>" <?php echo $shipSymbol === $selectedShipSymbol ? 'selected' : ''; ?>>
                        <?php echo htmlspecialchars( formatString( $shipSymbol ) . ' @ ' . $shipWaypoint ); ?>
                    </option>
                <?php endforeach; ?>
            </select>
        </div>

        <button type="submit" class="px-4 py-2 bg-blue-700 rounded hover:bg-blue-600">Load Market</button>
    </form>

    <?php if ($selectedShipSymbol === '' ) : ?>
        <div class="border border-gray-600 rounded p-4">
            No stationed ships are available for shopping.
        </div>
    <?php else : ?>
        <div class="mb-6 border border-gray-600 rounded p-4">
            <p>
                <span class="font-bold">Selected Ship:</span>
                <?php echo htmlspecialchars( formatString( $selectedShipSymbol ) ); ?>
            </p>

            <p>
                <span class="font-bold">Location:</span>
                <?php echo htmlspecialchars( $selectedWaypointSymbol ); ?>
            </p>

            <p>
                <span class="font-bold">Cargo:</span>
                <?php echo number_format( (int) ( $selectedShip['cargo']['units'] ?? 0 ) ); ?>
                /
                <?php echo number_format( (int) ( $selectedShip['cargo']['capacity'] ?? 0 ) ); ?>
            </p>
        </div>

        <?php if ($selectedMarketError !== '' ) : ?>
            <div class="border border-red-500 rounded p-4 text-red-300">
                <?php echo htmlspecialchars( $selectedMarketError ); ?>
            </div>
        <?php else : ?>
            <?php $tradeGoods = (array) ( $selectedMarketData['tradeGoods'] ?? array() ); ?>

            <?php if (empty( $tradeGoods ) ) : ?>
                <div class="border border-gray-600 rounded p-4">
                    No trade goods available for this market yet.
                </div>
            <?php else : ?>
                <table class="table-auto border-collapse border border-gray-300 w-full">
                    <tr>
                        <th class="border border-gray-300 px-3 py-2">Symbol</th>
                        <th class="border border-gray-300 px-3 py-2">Type</th>
                        <th class="border border-gray-300 px-3 py-2">Supply</th>
                        <th class="border border-gray-300 px-3 py-2">Purchase Price</th>
                        <th class="border border-gray-300 px-3 py-2">Sell Price</th>
                        <th class="border border-gray-300 px-3 py-2">Buy</th>
                    </tr>
                    <?php foreach ( $tradeGoods as $tradeGood ) : ?>
                        <?php
                        $tradeSymbol = (string) ( $tradeGood['symbol'] ?? '' );
                        $purchasePrice = (int) ( $tradeGood['purchasePrice'] ?? 0 );
                        ?>
                        <tr>
                            <td class="border border-gray-300 px-3 py-2"><?php echo htmlspecialchars( formatString( $tradeSymbol ) ); ?></td>
                            <td class="border border-gray-300 px-3 py-2"><?php echo htmlspecialchars( (string) ( formatString( $tradeGood['type'] ?? '' ) ) ); ?></td>
                            <td class="border border-gray-300 px-3 py-2"><?php echo htmlspecialchars( (string) ( formatString( $tradeGood['supply'] ?? '' ) ) ); ?></td>
                            <td class="border border-gray-300 px-3 py-2"><?php echo number_format( $purchasePrice ); ?></td>
                            <td class="border border-gray-300 px-3 py-2"><?php echo number_format( (int) ( $tradeGood['sellPrice'] ?? 0 ) ); ?></td>
                            <td class="border border-gray-300 px-3 py-2">
                                <?php if ($tradeSymbol !== '' && $purchasePrice > 0 ) : ?>
                                    <form method="post" class="flex items-center gap-2">
                                        <input type="hidden" name="buy_cargo" value="1">
                                        <input type="hidden" name="ship_symbol" value="<?php echo htmlspecialchars( $selectedShipSymbol ); ?>">
                                        <input type="hidden" name="trade_symbol" value="<?php echo htmlspecialchars( $tradeSymbol ); ?>">
                                        <input type="number" name="units" min="1" value="1" class="w-20 px-2 py-1 rounded text-black">
                                        <button type="submit" class="px-3 py-1 bg-emerald-700 rounded hover:bg-emerald-600">Buy</button>
                                    </form>
                                <?php else : ?>
                                    <span class="text-gray-400 text-sm">N/A</span>
                                <?php endif; ?>
                            </td>
                        </tr>
                    <?php endforeach; ?>
                </table>
            <?php endif; ?>
        <?php endif; ?>
    <?php endif; ?>
</body>
</html>