<?php

namespace App\Support;

class JudgeCardTemplateBuilder
{
    private const TOTAL_QUESTIONS = 20;

    public function build(): array
    {
        $template = config('exam.judge_card_template', []);

        $page = [
            'width' => (int) data_get($template, 'page.width', 2480),
            'height' => (int) data_get($template, 'page.height', 3508),
            'dpi' => (int) data_get($template, 'page.dpi', 300),
            'margin_top' => (int) data_get($template, 'page.margin_top', 260),
            'margin_right' => (int) data_get($template, 'page.margin_right', 236),
            'margin_bottom' => (int) data_get($template, 'page.margin_bottom', 272),
            'margin_left' => (int) data_get($template, 'page.margin_left', 236),
        ];
        $box = [
            'width' => (int) data_get($template, 'box.width', 30),
            'height' => (int) data_get($template, 'box.height', 30),
        ];
        $layout = [
            'start_x' => (int) data_get($template, 'layout.start_x', 522),
            'start_y' => (int) data_get($template, 'layout.start_y', 709),
            'row_height' => (int) data_get($template, 'layout.row_height', 100),
            'col_spacing' => (int) data_get($template, 'layout.col_spacing', 72),
            'header_top_offset' => (int) data_get($template, 'layout.header_top_offset', 0),
            'row_left_x' => (int) data_get($template, 'layout.row_left_x', 244),
            'row_width' => (int) data_get($template, 'layout.row_width', 1992),
            'row_padding_top' => (int) data_get($template, 'layout.row_padding_top', 8),
            'row_padding_bottom' => (int) data_get($template, 'layout.row_padding_bottom', 8),
            'label_x' => (int) data_get($template, 'layout.label_x', 260),
            'label_width' => (int) data_get($template, 'layout.label_width', 180),
            'label_to_box_gap' => (int) data_get($template, 'layout.label_to_box_gap', 16),
        ];
        $questions = self::TOTAL_QUESTIONS;
        $questionBoxCounts = $this->buildQuestionBoxCountsByRule($questions);

        return [
            'page' => $page,
            'box' => $box,
            'layout' => $layout,
            'questions' => $questions,
            'question_box_counts' => $questionBoxCounts,
            'mark_rules' => [
                'correct' => array_values((array) data_get($template, 'mark_rules.correct', ['/', '\\'])),
                'wrong' => array_values((array) data_get($template, 'mark_rules.wrong', ['X'])),
                'blank_is_wrong' => (bool) data_get($template, 'mark_rules.blank_is_wrong', true),
            ],
            'question_boxes' => $this->buildQuestionBoxes($questions, $questionBoxCounts, $layout, $box),
        ];
    }

    private function buildQuestionBoxCountsByRule(int $questions): array
    {
        $result = ['default' => 1];
        for ($q = 1; $q <= $questions; $q++) {
            $count = $this->resolveBoxCountByRule($q);
            if ($count !== 1) {
                $result[(string) $q] = $count;
            }
        }

        return $result;
    }

    private function buildQuestionBoxes(int $questions, array $questionBoxCounts, array $layout, array $box): array
    {
        $result = [];
        $defaultCount = (int) ($questionBoxCounts['default'] ?? 1);

        for ($q = 1; $q <= $questions; $q++) {
            $count = (int) ($questionBoxCounts[(string) $q] ?? $defaultCount);
            $boxes = [];
            $y = (int) $layout['start_y'] + (($q - 1) * (int) $layout['row_height']);

            for ($i = 0; $i < $count; $i++) {
                $boxes[] = [
                    'box_index' => $i,
                    'x' => (int) $layout['start_x'] + ($i * (int) $layout['col_spacing']),
                    'y' => $y,
                    'width' => (int) $box['width'],
                    'height' => (int) $box['height'],
                ];
            }

            $result[] = [
                'question' => $q,
                'box_count' => $count,
                'boxes' => $boxes,
            ];
        }

        return $result;
    }

    private function resolveBoxCountByRule(int $questionNo): int
    {
        // 固定规则：17、18题双框，其余单框
        return in_array($questionNo, [17, 18], true) ? 2 : 1;
    }
}