<?php

namespace App\Support;

final class SignupOptionCatalog
{
    /**
     * @return array<string, array{zh-CN: string, en: string}>
     */
    public static function degrees(): array
    {
        return [
            'associate' => ['zh-CN' => '大专', 'en' => 'Associate Degree'],
            'bachelor' => ['zh-CN' => '本科', 'en' => "Bachelor’s Degree"],
            'master' => ['zh-CN' => '硕士', 'en' => "Master’s Degree"],
            'doctorate' => ['zh-CN' => '博士', 'en' => 'Doctorate'],
            'other' => ['zh-CN' => '其他', 'en' => 'Other'],
        ];
    }

    /**
     * @return array<string, array{zh-CN: string, en: string}>
     */
    public static function locationCountries(): array
    {
        return [
            'cn' => ['zh-CN' => '中国', 'en' => 'China'],
            'overseas' => ['zh-CN' => '海外', 'en' => 'Outside China'],
        ];
    }

    /**
     * @return array<string, array{zh-CN: string, en: string}>
     */
    public static function eventLocations(): array
    {
        return [
            'shanghai' => ['zh-CN' => '上海', 'en' => 'Shanghai'],
            'suzhou' => ['zh-CN' => '苏州', 'en' => 'Suzhou'],
            'shenzhen' => ['zh-CN' => '深圳', 'en' => 'Shenzhen'],
        ];
    }

    /**
     * @return array<string, array{zh-CN: string, en: string}>
     */
    public static function audiencePurposes(): array
    {
        return [
            'networking' => ['zh-CN' => '项目交流', 'en' => 'Project Networking'],
            'collaboration' => ['zh-CN' => '产业合作', 'en' => 'Industry Collaboration'],
            'investment' => ['zh-CN' => '投资对接', 'en' => 'Investor Meetings'],
            'study' => ['zh-CN' => '学习参访', 'en' => 'Study Visit'],
            'media' => ['zh-CN' => '媒体报道', 'en' => 'Media Coverage'],
            'other' => ['zh-CN' => '其他', 'en' => 'Other'],
        ];
    }

    /**
     * @return array<string, string>
     */
    public static function legacyMap(string $kind): array
    {
        return match ($kind) {
            'degree' => [
                '大专' => 'associate',
                '本科' => 'bachelor',
                '硕士' => 'master',
                '博士' => 'doctorate',
                '其他' => 'other',
            ],
            'location_country' => [
                '中国' => 'cn',
                '海外' => 'overseas',
            ],
            'event_location' => [
                '上海' => 'shanghai',
                '苏州' => 'suzhou',
                '深圳' => 'shenzhen',
                '上海赛区' => 'shanghai',
                '苏州赛区' => 'suzhou',
                '深圳赛区' => 'shenzhen',
                'Shanghai' => 'shanghai',
                'Suzhou' => 'suzhou',
                'Shenzhen' => 'shenzhen',
            ],
            'purpose', 'audience_purpose' => [
                '项目交流' => 'networking',
                '产业合作' => 'collaboration',
                '投资对接' => 'investment',
                '学习参访' => 'study',
                '媒体报道' => 'media',
                '其他' => 'other',
            ],
            default => [],
        };
    }

    public static function normalize(string $kind, ?string $raw): ?string
    {
        if ($raw === null) {
            return null;
        }
        $value = trim($raw);
        if ($value === '') {
            return '';
        }
        $map = self::legacyMap($kind);
        if (isset($map[$value])) {
            return $map[$value];
        }
        $lower = mb_strtolower($value);
        foreach ($map as $alias => $code) {
            if (mb_strtolower((string) $alias) === $lower) {
                return $code;
            }
        }
        $catalog = self::catalogForKind($kind);
        if ($catalog !== null) {
            foreach ($catalog as $code => $labels) {
                if (mb_strtolower($code) === $lower) {
                    return $code;
                }
                if (mb_strtolower((string) ($labels['en'] ?? '')) === $lower) {
                    return $code;
                }
                if ((string) ($labels['zh-CN'] ?? '') === $value) {
                    return $code;
                }
            }
        }

        return $value;
    }

    /**
     * 同一选项的全部等价写法（编码 / 中文 / 英文），用于评审筛查等精确匹配。
     *
     * @return list<string>
     */
    public static function aliases(string $kind, string $raw): array
    {
        $value = trim($raw);
        $normalized = self::normalize($kind, $value);
        if ($normalized === null || $normalized === '') {
            return $value !== '' ? [$value] : [];
        }
        $out = [$normalized];
        if ($value !== '') {
            $out[] = $value;
        }
        $catalog = self::catalogForKind($kind) ?? [];
        if (isset($catalog[$normalized])) {
            $zh = trim((string) ($catalog[$normalized]['zh-CN'] ?? ''));
            $en = trim((string) ($catalog[$normalized]['en'] ?? ''));
            if ($zh !== '') {
                $out[] = $zh;
                if ($kind === 'event_location' && ! str_contains($zh, '赛区')) {
                    $out[] = $zh.'赛区';
                }
            }
            if ($en !== '') {
                $out[] = $en;
            }
        }
        foreach (self::legacyMap($kind) as $alias => $code) {
            if ($code === $normalized) {
                $out[] = (string) $alias;
            }
        }

        return array_values(array_unique(array_filter(
            array_map(static fn ($v) => trim((string) $v), $out),
            static fn ($v) => $v !== '',
        )));
    }

    /**
     * @param  iterable<int|string, mixed>  $values
     * @return list<string>
     */
    public static function expandAliases(string $kind, iterable $values): array
    {
        $out = [];
        foreach ($values as $value) {
            foreach (self::aliases($kind, trim((string) $value)) as $alias) {
                $out[$alias] = true;
            }
        }

        return array_keys($out);
    }

    public static function same(string $kind, ?string $left, ?string $right): bool
    {
        $a = self::normalize($kind, $left);
        $b = self::normalize($kind, $right);
        if ($a === null || $a === '' || $b === null || $b === '') {
            return false;
        }

        return $a === $b;
    }

    /**
     * @return array<string, array{zh-CN: string, en: string}>|null
     */
    private static function catalogForKind(string $kind): ?array
    {
        return match ($kind) {
            'degree' => self::degrees(),
            'location_country' => self::locationCountries(),
            'event_location' => self::eventLocations(),
            'purpose', 'audience_purpose' => self::audiencePurposes(),
            default => null,
        };
    }

    /**
     * @param  array<string, array{zh-CN: string, en: string}>  $catalog
     * @return list<string>
     */
    public static function codes(array $catalog): array
    {
        return array_keys($catalog);
    }

    /**
     * @param  array<string, array{zh-CN: string, en: string}>  $catalog
     * @return list<string>
     */
    public static function acceptedValues(array $catalog, string $kind): array
    {
        return array_values(array_unique([
            ...self::codes($catalog),
            ...array_keys(self::legacyMap($kind)),
        ]));
    }

    /**
     * @param  array<string, array{zh-CN: string, en: string}>  $catalog
     */
    public static function label(array $catalog, string $code, string $locale = PortalLocale::ZH): string
    {
        $normalized = self::normalize(
            $catalog === self::degrees() ? 'degree'
                : ($catalog === self::locationCountries() ? 'location_country'
                    : ($catalog === self::eventLocations() ? 'event_location' : 'purpose')),
            $code
        ) ?? $code;
        $row = $catalog[$normalized] ?? null;
        if ($row === null) {
            return $code;
        }

        return $locale === PortalLocale::EN
            ? ($row['en'] ?? $row['zh-CN'])
            : ($row['zh-CN'] ?? $row['en'] ?? $code);
    }

    /**
     * @param  array<string, array{zh-CN: string, en: string}>  $catalog
     * @return list<array{value: string, label: string, label_i18n: array{en: string}}>
     */
    public static function schemaOptions(array $catalog): array
    {
        $out = [];
        foreach ($catalog as $code => $labels) {
            $out[] = [
                'value' => $code,
                'label' => $labels['zh-CN'],
                'label_i18n' => ['en' => $labels['en']],
            ];
        }

        return $out;
    }
}