<?php
declare(strict_types=1);

namespace App\Controllers;

use App\Auth;
use App\Database;

class NodeTypeController
{
    public function index(): void
    {
        $this->requireAdmin();

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

        $stmt = $db->prepare('SELECT * FROM node_types WHERE family_id = ? ORDER BY is_system DESC, id ASC');
        $stmt->execute([$familyId]);
        $types = $stmt->fetchAll();

        // 统计每个类型被引用的节点数
        foreach ($types as &$t) {
            $s = $db->prepare('SELECT COUNT(*) FROM trip_nodes WHERE node_type_id = ?');
            $s->execute([$t['id']]);
            $t['node_count'] = (int)$s->fetchColumn();
        }
        unset($t);

        view('node_types/index', [
            'types'     => $types,
            'pageTitle' => '节点类型管理',
        ]);
    }

    public function create(): void
    {
        $this->requireAdmin();
        view('node_types/form', [
            'type'      => null,
            'pageTitle' => '新增节点类型',
        ]);
    }

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

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

        $name = trim($_POST['name'] ?? '');
        $icon = trim($_POST['icon'] ?? '');

        if ($name === '') {
            flash('error', '名称不能为空');
            redirect('node_types/create');
        }
        if (mb_strlen($name) > 30) {
            flash('error', '名称不能超过 30 个字符');
            redirect('node_types/create');
        }

        // 唯一性校验
        $chk = $db->prepare('SELECT id FROM node_types WHERE family_id = ? AND name = ? LIMIT 1');
        $chk->execute([$familyId, $name]);
        if ($chk->fetch()) {
            flash('error', '该类型名称已存在');
            redirect('node_types/create');
        }

        $stmt = $db->prepare('INSERT INTO node_types (family_id, name, icon, is_system) VALUES (?, ?, ?, FALSE)');
        $stmt->execute([$familyId, $name, $icon ?: null]);

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

    public function edit(): void
    {
        $this->requireAdmin();

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

        $stmt = $db->prepare('SELECT * FROM node_types WHERE id = ? AND family_id = ?');
        $stmt->execute([$id, Auth::familyId()]);
        $type = $stmt->fetch();
        if (!$type) {
            http_response_code(404);
            exit('节点类型不存在');
        }

        view('node_types/form', [
            'type'      => $type,
            'pageTitle' => '编辑节点类型',
        ]);
    }

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

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

        $stmt = $db->prepare('SELECT * FROM node_types WHERE id = ? AND family_id = ?');
        $stmt->execute([$id, $familyId]);
        $type = $stmt->fetch();
        if (!$type) {
            http_response_code(404);
            exit('节点类型不存在');
        }

        $name = trim($_POST['name'] ?? '');
        $icon = trim($_POST['icon'] ?? '');

        if ($name === '') {
            flash('error', '名称不能为空');
            redirect('node_types/edit', ['id' => $id]);
        }
        if (mb_strlen($name) > 30) {
            flash('error', '名称不能超过 30 个字符');
            redirect('node_types/edit', ['id' => $id]);
        }

        // 唯一性检查（排除自身）
        $chk = $db->prepare('SELECT id FROM node_types WHERE family_id = ? AND name = ? AND id != ? LIMIT 1');
        $chk->execute([$familyId, $name, $id]);
        if ($chk->fetch()) {
            flash('error', '该类型名称已被其他类型使用');
            redirect('node_types/edit', ['id' => $id]);
        }

        $stmt = $db->prepare('UPDATE node_types SET name = ?, icon = ? WHERE id = ?');
        $stmt->execute([$name, $icon ?: null, $id]);

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

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

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

        $stmt = $db->prepare('SELECT * FROM node_types WHERE id = ? AND family_id = ?');
        $stmt->execute([$id, Auth::familyId()]);
        $type = $stmt->fetch();
        if (!$type) {
            flash('error', '节点类型不存在');
            redirect('node_types/index');
        }

        if ((int)$type['is_system'] === 1) {
            flash('error', '系统内置类型不能删除');
            redirect('node_types/index');
        }

        // 检查是否被引用
        $cnt = $db->prepare('SELECT COUNT(*) FROM trip_nodes WHERE node_type_id = ?');
        $cnt->execute([$id]);
        $usedCount = (int)$cnt->fetchColumn();

        if ($usedCount > 0) {
            flash('error', "该类型已被 {$usedCount} 个节点使用，无法删除");
            redirect('node_types/index');
        }

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

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

    private function requireAdmin(): void
    {
        if (!Auth::isAdmin()) {
            http_response_code(403);
            exit('仅管理员可访问此页面');
        }
    }
}