<?php

namespace App\Services;

/** Tempo decision: programme/portfolio applicability; persisted in existing canonical JSON. */
class OpportunityInitiativeApplicability
{
    public const GROUPS = [
        'physical_site' => ['location_mode', 'licenses', 'environmental_social'],
        'individual_business' => ['promoter_id', 'promoter_type', 'opportunity_type', 'investor_profiles', 'products', 'assets', 'inputs', 'markets', 'competitive_advantage', 'employment', 'impact_indicators', 'enterprise_size'],
        'unit_investment' => ['total_investment', 'currency', 'investment_breakdown', 'secured_financing', 'funding_sought', 'financial_indicators'],
    ];

    public function enabled(array $p): bool
    {
        return ($p['opportunity_category'] ?? null) === 'investment_project'
            && in_array($p['initiative']['kind'] ?? null, ['program', 'portfolio'], true);
    }

    public function applicable(array $p, string $group): bool
    {
        return ! $this->enabled($p) || ($p['initiative']['applicability'][$group] ?? 'missing') !== 'not_applicable';
    }

    public function schema(array $schema, array $payload): array
    {
        $base = &$schema['$defs']['opportunityCreate'];
        $text = ['type' => ['string', 'null'], 'maxLength' => 4000];
        $base['properties']['initiative'] = ['type' => 'object', 'additionalProperties' => false,
            'required' => ['kind', 'responsible_name', 'coverage_statement', 'applicability'],
            'properties' => [
                'kind' => ['enum' => ['program', 'portfolio']],
                'responsible_name' => ['type' => 'string', 'minLength' => 1, 'maxLength' => 500],
                'coverage_statement' => ['type' => 'string', 'minLength' => 1, 'maxLength' => 4000],
                'aggregate_budget_statement' => $text,
                'applicability' => ['type' => 'object', 'additionalProperties' => false,
                    'required' => array_keys(self::GROUPS),
                    'properties' => array_fill_keys(array_keys(self::GROUPS), ['enum' => ['applicable', 'not_applicable', 'missing']])],
            ]];
        if (! $this->enabled($payload)) {
            // A profile cannot relax requirements of another category.
            if (isset($payload['initiative'])) {
                $base['allOf'][] = ['properties' => ['opportunity_category' => ['const' => 'investment_project']]];
            }
            return $schema;
        }
        $ignored = [];
        foreach (self::GROUPS as $group => $fields) {
            if (! $this->applicable($payload, $group)) {
                $ignored = [...$ignored, ...$fields];
            }
        }
        // Program responsibility is distinct from component promoter identity, in all cases.
        $ignored = array_unique([...$ignored, 'promoter_id', 'promoter_type']);
        $base['required'] = array_values(array_diff($base['required'], $ignored));
        $base['required'][] = 'initiative';
        foreach ($ignored as $field) {
            $base['properties'][$field] = ['description' => 'Not applicable; retained without alteration']; // Retain old bytes; do not validate an inapplicable placeholder.
        }
        foreach ($base['allOf'] as &$condition) {
            if (isset($condition['then']['required'])) {
                $condition['then']['required'] = array_values(array_diff($condition['then']['required'], $ignored));
            }
            if (isset($condition['then']['properties'])) {
                $condition['then']['properties'] = array_diff_key($condition['then']['properties'], array_flip($ignored));
            }
            // Location counts apply to implantation, not to the coverage resources.
            if (! $this->applicable($payload, 'physical_site') && isset($condition['if']['properties']['location_mode'])) {
                $condition = ['description' => 'Coverage is distinct from physical implantation'];
            }
        }
        unset($condition);
        if (! $this->applicable($payload, 'physical_site')) {
            unset($base['properties']['locations']['minItems']);
        }
        return $schema;
    }

    public function validate(array $p, array &$errors): void
    {
        if (! $this->enabled($p)) {
            return;
        }
        if (! in_array($p['maturity_stage'] ?? null, array_keys(OpportunityMaturity::STAGES), true)) {
            $errors['canonical.maturity_stage'] = 'Indique a etapa conhecida do programa/carteira; a classificação não confirma preparação ou viabilidade.';
        }
        foreach (self::GROUPS as $group => $fields) {
            if (($p['initiative']['applicability'][$group] ?? 'missing') === 'missing') {
                $errors['canonical.initiative.applicability.'.$group] = 'Informação em falta: indique se este grupo é aplicável ou não aplicável à ficha; não invente dados das componentes.';
            }
        }
    }
}