<?php
declare(strict_types=1);

namespace App\Controllers;

use App\Auth;
use App\Database;

class TravelModeController
{
    public const MODE_LABELS = [
        'drive_own'    => '自驾（自有车）',
        'drive_rental' => '自驾（租车）',
        'train'        => '火车/高铁',
        'plane'        => '飞机',
        'bus'          => '大巴/公交',
        'subway'       => '地铁',
        'taxi'         => '出租车/网约车',
        'bike'         => '骑行',
        'walk'         => '步行',
        'ship'         => '轮渡/游船',
        'other'        => '其他',
    ];

    /**
     * 出行方式 → 地图/卡片上的图标（emoji）。
     * 自驾两类仍用 🚗（本来就是开车）；其余按交通工具区分，
     * 避免路线地图上「一律汽车」让人误解（批 19）。未列入的 mode_type 回退到节点类型图标。
     */
    public const MODE_ICONS = [
        'drive_own'    => '🚗',
        'drive_rental' => '🚙',
        'train'        => '🚄',
        'plane'        => '✈️',
        'bus'          => '🚌',
        'subway'       => '🚇',
        'taxi'         => '🚕',
        'bike'         => '🚲',
        'walk'         => '🚶',
        'ship'         => '🚢',
        'other'        => '🔀',
    ];

    public function index(): void
    {
        $this->requireLogin();

        $db = Database::get();
        $familyId = Auth::familyId();

        $stmt = $db->prepare('
            SELECT tm.*, v.plate_number, v.model_name
            FROM travel_modes tm
            LEFT JOIN vehicles v ON v.id = tm.vehicle_id
            WHERE tm.family_id = ?
            ORDER BY FIELD(tm.mode_type, "drive_own","drive_rental","train","plane","bus","subway","taxi","bike","walk","ship","other"), tm.id ASC
        ');
        $stmt->execute([$familyId]);
        $modes = $stmt->fetchAll();

        foreach ($modes as &$m) {
            $s = $db->prepare('SELECT COUNT(*) FROM trip_nodes WHERE travel_mode_id = ?');
            $s->execute([$m['id']]);
            $m['node_count'] = (int)$s->fetchColumn();
        }
        unset($m);

        view('travel_modes/index', [
            'modes'      => $modes,
            'modeLabels' => self::MODE_LABELS,
            'pageTitle'  => '出行方式管理',
        ]);
    }

    public function create(): void
    {
        $this->requireLogin();
        view('travel_modes/form', [
            'mode'       => null,
            'vehicles'   => $this->fetchVehicles(),
            'modeLabels' => self::MODE_LABELS,
            'pageTitle'  => '新增出行方式',
        ]);
    }

    public function store(): void
    {
        $this->requireLogin();
        csrf_check();

        $db = Database::get();
        $familyId = Auth::familyId();

        $modeType = $_POST['mode_type'] ?? '';
        if (!isset(self::MODE_LABELS[$modeType])) {
            flash('error', '无效的交通类型');
            redirect('travel_modes/create');
        }

        $vehicleId = $this->validateVehicle($modeType, $db, $familyId, 'travel_modes/create');

        $stmt = $db->prepare('INSERT INTO travel_modes (family_id, mode_type, vehicle_id, notes) VALUES (?, ?, ?, ?)');
        $stmt->execute([
            $familyId,
            $modeType,
            $vehicleId,
            $this->strOrNull('notes'),
        ]);

        flash('error', '创建成功');
        redirect('travel_modes/index');
    }

    public function edit(): void
    {
        $this->requireLogin();
        $id = (int)($_GET['id'] ?? 0);
        $db = Database::get();

        $stmt = $db->prepare('SELECT * FROM travel_modes WHERE id = ? AND family_id = ?');
        $stmt->execute([$id, Auth::familyId()]);
        $mode = $stmt->fetch();
        if (!$mode) {
            http_response_code(404);
            exit('出行方式不存在');
        }

        view('travel_modes/form', [
            'mode'       => $mode,
            'vehicles'   => $this->fetchVehicles(),
            'modeLabels' => self::MODE_LABELS,
            'pageTitle'  => '编辑出行方式',
        ]);
    }

    public function update(): void
    {
        $this->requireLogin();
        csrf_check();

        $db = Database::get();
        $familyId = Auth::familyId();
        $id = (int)($_POST['id'] ?? 0);

        $stmt = $db->prepare('SELECT * FROM travel_modes WHERE id = ? AND family_id = ?');
        $stmt->execute([$id, $familyId]);
        if (!$stmt->fetch()) {
            http_response_code(404);
            exit('出行方式不存在');
        }

        $modeType = $_POST['mode_type'] ?? '';
        if (!isset(self::MODE_LABELS[$modeType])) {
            flash('error', '无效的交通类型');
            redirect('travel_modes/edit', ['id' => $id]);
        }

        $vehicleId = $this->validateVehicle($modeType, $db, $familyId, 'travel_modes/edit', ['id' => $id]);

        $stmt = $db->prepare('UPDATE travel_modes SET mode_type = ?, vehicle_id = ?, notes = ? WHERE id = ?');
        $stmt->execute([
            $modeType,
            $vehicleId,
            $this->strOrNull('notes'),
            $id,
        ]);

        flash('error', '保存成功');
        redirect('travel_modes/index');
    }

    public function destroy(): void
    {
        $this->requireLogin();
        csrf_check();

        $db = Database::get();
        $id = (int)($_POST['id'] ?? 0);

        $stmt = $db->prepare('SELECT * FROM travel_modes WHERE id = ? AND family_id = ?');
        $stmt->execute([$id, Auth::familyId()]);
        if (!$stmt->fetch()) {
            flash('error', '出行方式不存在');
            redirect('travel_modes/index');
        }

        $cnt = $db->prepare('SELECT COUNT(*) FROM trip_nodes WHERE travel_mode_id = ?');
        $cnt->execute([$id]);
        $usedCount = (int)$cnt->fetchColumn();
        if ($usedCount > 0) {
            flash('error', "该出行方式已被 {$usedCount} 个节点使用，无法删除");
            redirect('travel_modes/index');
        }

        $stmt = $db->prepare('DELETE FROM travel_modes WHERE id = ?');
        $stmt->execute([$id]);

        flash('error', '删除成功');
        redirect('travel_modes/index');
    }

    private function validateVehicle(string $modeType, \PDO $db, int $familyId, string $route, array $params = []): ?int
    {
        if (!in_array($modeType, ['drive_own', 'drive_rental'], true)) {
            return null;
        }

        $vehicleId = (int)($_POST['vehicle_id'] ?? 0);
        if ($vehicleId <= 0) {
            flash('error', '自驾类型必须选择车辆');
            redirect($route, $params);
        }
        $chk = $db->prepare('SELECT id, vehicle_type FROM vehicles WHERE id = ? AND family_id = ?');
        $chk->execute([$vehicleId, $familyId]);
        $veh = $chk->fetch();
        if (!$veh) {
            flash('error', '车辆不存在');
            redirect($route, $params);
        }
        if ($modeType === 'drive_own' && $veh['vehicle_type'] !== 'own') {
            flash('error', '自有车类型必须选择自有车辆');
            redirect($route, $params);
        }
        if ($modeType === 'drive_rental' && $veh['vehicle_type'] !== 'rental') {
            flash('error', '租车类型必须选择租用车辆');
            redirect($route, $params);
        }
        return $vehicleId;
    }

    private function fetchVehicles(): array
    {
        $stmt = Database::get()->prepare('SELECT * FROM vehicles WHERE family_id = ? ORDER BY vehicle_type ASC, is_default DESC, id ASC');
        $stmt->execute([Auth::familyId()]);
        return $stmt->fetchAll();
    }

    private function strOrNull(string $key): ?string
    {
        $v = trim($_POST[$key] ?? '');
        return $v === '' ? null : $v;
    }

    private function requireLogin(): void
    {
        if (!Auth::check()) {
            redirect('auth/login');
        }
    }
}