<?php

declare(strict_types=1);

namespace App\Support\ReviewPacks;

final class ReportDisclosurePolicy
{
    public const string PROOF_VERIFIED = 'verified';

    public const string PROOF_ASSUMED = 'assumed';

    public const string PROOF_MISSING = 'missing';

    public const string PROOF_UNKNOWN = 'unknown';

    public const string PROOF_NOT_APPLICABLE = 'not_applicable';

    /**
     * @param  array<string, mixed>  $profile
     * @param  array<string, mixed>  $readiness
     * @param  array<string, mixed>  $metadata
     * @return array{
     *   mandatory_disclosures:list<array{key:string,label:string,summary:string,proof_state:string}>,
     *   warnings:list<array{key:string,label:string,summary:string}>,
     *   blocking_reasons:list<array{key:string,label:string,summary:string}>,
     *   proof_states:array{audience_boundary:string,evidence_basis:string,protected_values:string,non_certification:string},
     *   show_section_appendix:bool,
     *   show_technical_details:bool
     * }
     */
    public static function evaluate(array $profile, array $readiness, array $metadata = []): array
    {
        $isCustomerFacing = (bool) ($profile['is_customer_facing'] ?? false);
        $containsPii = (bool) ($readiness['contains_pii'] ?? false);
        $protectedValuesHidden = (bool) ($readiness['protected_values_hidden'] ?? false);
        $disclosurePresent = (bool) ($readiness['disclosure_present'] ?? false);
        $displayedDisclosure = self::plainText(
            $metadata['non_certification_disclosure'] ?? null,
            __('localization.review.non_certification_disclosure_text'),
        );

        $proofStates = [
            'audience_boundary' => self::PROOF_VERIFIED,
            'evidence_basis' => self::evidenceBasisProofState((string) ($readiness['evidence_completeness_state'] ?? '')),
            'protected_values' => self::protectedValuesProofState(
                isCustomerFacing: $isCustomerFacing,
                containsPii: $containsPii,
                protectedValuesHidden: $protectedValuesHidden,
            ),
            'non_certification' => $disclosurePresent
                ? self::PROOF_ASSUMED
                : self::PROOF_MISSING,
        ];

        $blockingReasons = [];

        if ($isCustomerFacing && $containsPii) {
            $blockingReasons[] = [
                'key' => 'customer_profile_internal_only',
                'label' => __('localization.review.report_disclosure_customer_profile_internal_only'),
                'summary' => __('localization.review.report_disclosure_customer_profile_internal_only_summary'),
            ];
        }

        $warnings = [];

        if ((bool) ($profile['is_fallback'] ?? false)) {
            $warnings[] = [
                'key' => 'profile_fallback',
                'label' => __('localization.review.report_profile_fallback_notice'),
                'summary' => __('localization.review.report_profile_fallback_summary'),
            ];
        }

        if ($isCustomerFacing && (string) ($readiness['customer_safe_state'] ?? '') !== ReviewPackOutputReadiness::STATE_CUSTOMER_SAFE_READY) {
            $warnings[] = [
                'key' => 'customer_profile_requires_review',
                'label' => __('localization.review.report_external_sharing_warning'),
                'summary' => __('localization.review.report_disclosure_customer_profile_requires_review'),
            ];
        }

        if ($proofStates['non_certification'] === self::PROOF_MISSING) {
            $warnings[] = [
                'key' => 'non_certification_missing',
                'label' => __('localization.review.non_certification_disclosure'),
                'summary' => __('localization.review.report_disclosure_non_certification_missing'),
            ];
        }

        $showDetailedContent = ! ($isCustomerFacing && $containsPii);

        return [
            'mandatory_disclosures' => [
                [
                    'key' => 'audience_boundary',
                    'label' => __('localization.review.report_disclosure_audience_boundary'),
                    'summary' => __('localization.review.report_disclosure_audience_boundary_summary', [
                        'audience' => (string) ($profile['audience_label'] ?? __('localization.review.unavailable')),
                    ]),
                    'proof_state' => $proofStates['audience_boundary'],
                ],
                [
                    'key' => 'evidence_basis',
                    'label' => __('localization.review.report_disclosure_evidence_basis'),
                    'summary' => match ($proofStates['evidence_basis']) {
                        self::PROOF_VERIFIED => __('localization.review.report_disclosure_evidence_verified'),
                        self::PROOF_MISSING => __('localization.review.report_disclosure_evidence_missing'),
                        default => __('localization.review.report_disclosure_evidence_unknown'),
                    },
                    'proof_state' => $proofStates['evidence_basis'],
                ],
                [
                    'key' => 'protected_values',
                    'label' => __('localization.review.report_disclosure_protected_values'),
                    'summary' => match ($proofStates['protected_values']) {
                        self::PROOF_ASSUMED => __('localization.review.report_disclosure_protected_values_assumed'),
                        self::PROOF_NOT_APPLICABLE => __('localization.review.report_disclosure_protected_values_not_applicable'),
                        self::PROOF_MISSING => __('localization.review.report_disclosure_protected_values_missing'),
                        default => __('localization.review.report_disclosure_protected_values_unknown'),
                    },
                    'proof_state' => $proofStates['protected_values'],
                ],
                [
                    'key' => 'non_certification',
                    'label' => __('localization.review.non_certification_disclosure'),
                    'summary' => $displayedDisclosure,
                    'proof_state' => $proofStates['non_certification'],
                ],
            ],
            'warnings' => $warnings,
            'blocking_reasons' => $blockingReasons,
            'proof_states' => $proofStates,
            'show_section_appendix' => (bool) ($profile['show_section_appendix'] ?? false) && $showDetailedContent,
            'show_technical_details' => (bool) ($profile['show_technical_details'] ?? false) && $showDetailedContent,
        ];
    }

    private static function evidenceBasisProofState(string $evidenceCompletenessState): string
    {
        return match ($evidenceCompletenessState) {
            'complete' => self::PROOF_VERIFIED,
            'missing', 'partial', 'stale' => self::PROOF_MISSING,
            default => self::PROOF_UNKNOWN,
        };
    }

    private static function protectedValuesProofState(
        bool $isCustomerFacing,
        bool $containsPii,
        bool $protectedValuesHidden,
    ): string {
        if (! $isCustomerFacing) {
            return self::PROOF_NOT_APPLICABLE;
        }

        if ($containsPii || ! $protectedValuesHidden) {
            return self::PROOF_MISSING;
        }

        return self::PROOF_ASSUMED;
    }

    private static function plainText(mixed $value, string $fallback): string
    {
        if (! is_scalar($value) && $value !== null) {
            return $fallback;
        }

        $text = preg_replace('/\s+/', ' ', trim((string) $value));

        if (! is_string($text) || $text === '') {
            return $fallback;
        }

        return str_starts_with($text, 'localization.') ? $fallback : $text;
    }
}