<?php
declare(strict_types=1);

namespace app\controller;

use app\service\ExplorerApi;
use think\facade\View;

class Index
{
    /**
     * 首页：网络统计 + 最新区块列表
     */
    public function index()
    {
        $rawStats = ExplorerApi::getStats();
        $rawBlocks = ExplorerApi::getBlocks(20, 1);

        // 预处理统计数据（模板只接收字符串/数字，不调用静态方法）
        $stats = $this->processStats($rawStats);

        // 预处理区块列表
        $blocks = array_map([$this, 'processBlock'], $rawBlocks['blocks'] ?? []);

        return View::fetch('index/index', [
            'stats'  => $stats,
            'blocks' => $blocks,
        ]);
    }

    /**
     * 区块列表页（分页）
     */
    public function blocks()
    {
        $page  = max(1, (int) request()->param('page', 1));
        $limit = 25;
        $data  = ExplorerApi::getBlocks($limit, $page);

        $blocks = array_map([$this, 'processBlock'], $data['blocks'] ?? []);
        $total  = (int) ($data['total'] ?? 0);

        return View::fetch('index/blocks', [
            'blocks'     => $blocks,
            'total'      => $total,
            'page'       => $page,
            'limit'      => $limit,
            'totalPages' => max(1, (int) ceil($total / $limit)),
        ]);
    }

    /**
     * 区块详情页
     */
    public function block()
    {
        $number = (int) request()->param('n', 0);

        if ($number <= 0) {
            return View::fetch('index/error', ['message' => '无效的区块号']);
        }

        $raw = ExplorerApi::getBlock($number);

        if (!$raw) {
            return View::fetch('index/block', [
                'block'    => null,
                'blockNum' => $number,
                'transactions' => [],
                'txCount'  => 0,
            ]);
        }

        $block = $this->processBlock($raw);
        $block['prevNumber'] = max(0, $number - 1);
        $block['nextNumber'] = $number + 1;

        // 预处理交易列表
        $transactions = [];
        foreach ($raw['transactions'] ?? [] as $tx) {
            $transactions[] = [
                'shortHash'  => ExplorerApi::shortHash($tx['hash'] ?? '', 10, 8),
                'shortFrom'  => ExplorerApi::shortHash($tx['from'] ?? '', 8, 6),
                'shortTo'    => ExplorerApi::shortHash($tx['to'] ?? '', 8, 6),
                'value'      => $tx['value'] ?? 0,
                'type'       => $tx['type'] ?? 'transfer',
                'status'     => $tx['status'] ?? 'success',
            ];
        }

        return View::fetch('index/block', [
            'block'        => $block,
            'blockNum'     => $number,
            'transactions' => $transactions,
            'txCount'      => count($transactions),
        ]);
    }

    /**
     * 搜索
     */
    public function search()
    {
        $q    = trim((string) request()->param('q', ''));
        $type = '';
        $result = null;

        if ($q !== '') {
            $raw = ExplorerApi::search($q);
            // API 返回格式: {"type":"block","data":{...}} 或 {"data":{"type":"block","block":{...}}}
            // 兼容两种格式
            $type = $raw['type'] ?? ($raw['data']['type'] ?? '');

            if ($type === 'block') {
                // 新格式：data 直接是区块对象
                $b = $raw['data'] ?? [];
                // 兼容旧格式：data.block
                if (empty($b['number']) && !empty($raw['data']['block'])) {
                    $b = $raw['data']['block'];
                }
                if (!empty($b['number'])) {
                    $result = [
                        'number'   => $b['number'] ?? 0,
                        'hash'     => $b['hash'] ?? 'N/A',
                        'timeAgo'  => ExplorerApi::timeAgo($b['timestamp'] ?? 0),
                    ];
                }
            } elseif ($type === 'transaction') {
                $tx = $raw['data']['tx'] ?? $raw['data'] ?? [];
                if (!empty($tx['hash'])) {
                    $result = [
                        'hash'        => $tx['hash'] ?? 'N/A',
                        'blockNumber' => $tx['blockNumber'] ?? 0,
                        'status'      => $tx['status'] ?? 'success',
                    ];
                }
            } elseif ($type === 'address') {
                $addr = $raw['data']['address'] ?? $raw['data'] ?? [];
                if (!empty($addr['address'])) {
                    $result = [
                        'address' => $addr['address'] ?? $q,
                        'balance' => $addr['balance'] ?? 0,
                        'txCount' => $addr['txCount'] ?? 0,
                    ];
                }
            }
        }

        return View::fetch('index/search', [
            'q'      => htmlspecialchars($q),
            'type'   => $type,
            'result' => $result,
        ]);
    }

    /**
     * 节点状态页
     */
    public function nodes()
    {
        $rawStats = ExplorerApi::getStats();
        $health   = ExplorerApi::health();

        $stats = $this->processStats($rawStats);
        $healthJson = json_encode($health, JSON_PRETTY_PRINT | JSON_UNESCAPED_UNICODE);

        return View::fetch('index/nodes', [
            'stats'      => $stats,
            'healthJson' => $healthJson,
        ]);
    }

    // ─────────────────────────────────────────────
    // 私有辅助方法：数据预处理
    // ─────────────────────────────────────────────

    /**
     * 预处理统计数据，生成模板直接可用的字段
     */
    private function processStats(array $raw): array
    {
        $cbpp = $raw['cbppConsensus'] ?? 'unknown';
        $csnp = $raw['csnpNetwork'] ?? 'unknown';
        $constitution = (bool) ($raw['constitutionLayer'] ?? false);
        $fluid = (bool) ($raw['fluidBlockMode'] ?? false);

        return [
            'currentBlock'      => $raw['currentBlock'] ?? 0,
            'cbppConsensus'     => $cbpp,
            'cbppBadge'         => $this->statusBadge($cbpp),
            'csnpNetwork'       => $csnp,
            'csnpBadge'         => $this->statusBadge($csnp),
            'constitutionLayer' => $constitution,
            'constitutionText'  => $constitution ? '已激活' : '未激活',
            'constitutionBadge' => $constitution ? 'bg-success' : 'bg-secondary',
            'fluidBlockMode'    => $fluid,
            'fluidText'         => $fluid ? '已启用' : '未启用',
            'fluidBadge'        => $fluid ? 'bg-success' : 'bg-secondary',
            'chainId'           => $raw['chainId'] ?? 20260131,
            'network'           => $raw['network'] ?? 'mainnet',
            'nodeCount'         => $raw['nodeCount'] ?? 0,
            'totalTransactions' => $raw['totalTransactions'] ?? 0,
            'tps'               => $raw['tps'] ?? 0,
            'avgBlockTime'      => $raw['avgBlockTime'] ?? '3.0',
        ];
    }

    /**
     * 预处理单个区块数据
     */
    private function processBlock(array $block): array
    {
        $constitution = (bool) ($block['constitutionLayer'] ?? false);
        $isHeartbeat  = (bool) ($block['isHeartbeat'] ?? false);
        $blockType    = $block['blockType'] ?? ($isHeartbeat ? 'heartbeat' : 'tx');
        $blockTypeLabel = $block['blockTypeLabel'] ?? ($isHeartbeat ? '心跳块' : '交易块');
        $blockTypeNote  = $block['blockTypeNote'] ?? ($isHeartbeat
            ? 'CBPP 宪法原则四：无交易时每60秒产生心跳块，证明网络存活'
            : 'CBPP 交易驱动块：包含真实链上交易');
        return [
            'number'           => $block['number'] ?? $block['height'] ?? 0,
            'hash'             => $block['hash'] ?? 'N/A',
            'shortHash'        => ExplorerApi::shortHash($block['hash'] ?? '', 16, 12),
            'parentHash'       => $block['parentHash'] ?? $block['parent_hash'] ?? 'N/A',
            'timestamp'        => $block['timestamp'] ?? 0,
            'formatTime'       => ExplorerApi::formatTime($block['timestamp'] ?? 0),
            'timeAgo'          => ExplorerApi::timeAgo($block['timestamp'] ?? 0),
            'validator'        => $block['validator'] ?? $block['producer'] ?? 'N/A',
            'shortValidator'   => ExplorerApi::shortHash($block['validator'] ?? $block['producer'] ?? '', 8, 6),
            'txCount'          => $block['txCount'] ?? $block['tx_count'] ?? 0,
            'size'             => $block['size'] ?? 0,
            'cbppRound'        => $block['cbppRound'] ?? $block['cbpp_round'] ?? '—',
            'epoch'            => $block['epoch'] ?? 0,
            'stateRoot'        => $block['stateRoot'] ?? $block['state_root'] ?? 'N/A',
            'txRoot'           => $block['txRoot'] ?? $block['tx_root'] ?? 'N/A',
            'constitutionLayer'=> $constitution,
            'constitutionText' => $constitution ? '已激活' : '未激活',
            'constitutionBadge'=> $constitution ? 'bg-success' : 'bg-secondary',
            'isHeartbeat'      => $isHeartbeat,
            'blockType'        => $blockType,
            'blockTypeLabel'   => $blockTypeLabel,
            'blockTypeNote'    => $blockTypeNote,
            'blockTypeBadge'   => $isHeartbeat ? 'warning text-dark' : 'info text-dark',
            'confirmations'    => $block['confirmations'] ?? 0,
            'dataSource'       => $block['dataSource'] ?? 'CBPP-Node-9545',
            'transactions'     => $block['transactions'] ?? [],
        ];
    }

    /**
     * 状态徽章 CSS 类
     */
    private function statusBadge(string $status): string
    {
        return match (strtolower($status)) {
            'active', 'connected', 'running', 'online' => 'bg-success',
            'syncing', 'pending', 'starting'            => 'bg-warning text-dark',
            'error', 'failed', 'offline', 'stopped'    => 'bg-danger',
            default                                      => 'bg-secondary',
        };
    }
}