<?php
/** Shared read-only consumer surface for human and MCP projections. */

declare(strict_types=1);

if (!defined('ABSPATH')) {
    exit;
}

final class AIFQ_SR_Next_Consumer_Surface {
    private AIFQ_SR_Next_Read_Model_Composer $composer;
    private AIFQ_SR_Review_Repository $reviews;
    private AIFQ_SR_Next_Review_Reader $review_reader;
    private AIFQ_SR_Next_Human_Projection $human_projection;
    private AIFQ_SR_Next_MCP_Projection $mcp_projection;
    private AIFQ_SR_Next_Projection_Fidelity $fidelity;

    public function __construct(
        ?AIFQ_SR_Next_Read_Model_Composer $composer = null,
        ?AIFQ_SR_Review_Repository $reviews = null,
        ?AIFQ_SR_Next_Review_Reader $review_reader = null,
        ?AIFQ_SR_Next_Human_Projection $human_projection = null,
        ?AIFQ_SR_Next_MCP_Projection $mcp_projection = null,
        ?AIFQ_SR_Next_Projection_Fidelity $fidelity = null
    ) {
        $this->composer = $composer ?? new AIFQ_SR_Next_Read_Model_Composer();
        $this->reviews = $reviews ?? new AIFQ_SR_Review_Repository();
        $this->review_reader = $review_reader ?? new AIFQ_SR_Next_Review_Reader();
        $this->human_projection = $human_projection ?? new AIFQ_SR_Next_Human_Projection();
        $this->mcp_projection = $mcp_projection ?? new AIFQ_SR_Next_MCP_Projection();
        $this->fidelity = $fidelity ?? new AIFQ_SR_Next_Projection_Fidelity();
    }

    public function current_model(): ?array {
        $model = $this->composer->current();
        return is_array($model) && AIFQ_SR_Next_Projection_Contract::valid_model($model) ? $model : null;
    }

    public function current_projections(): ?array {
        $model = $this->current_model();
        if ($model === null) {
            return null;
        }

        $human = $this->human_projection->project($model);
        $mcp = $this->mcp_projection->project($model);
        if (
            !is_array($human)
            || !is_array($mcp)
            || !$this->fidelity->compare($model, $human, $mcp)
        ) {
            return null;
        }

        return [
            'model' => $model,
            'human' => $human,
            'mcp' => $mcp,
        ];
    }

    public function resolve_current_evidence(string $evidence_id): ?array {
        $evidence_id = trim($evidence_id);
        $model = $this->current_model();
        if (
            $evidence_id === ''
            || $model === null
            || !in_array($evidence_id, $model['evidence_inventory_refs'], true)
        ) {
            return null;
        }

        $metadata = $this->reviews->get_canonical_pair_metadata();
        $review_id = trim((string) ($metadata['current_review_id'] ?? ''));
        if ($review_id === '' || $review_id !== (string) $model['review']['review_id']) {
            return null;
        }

        $review = $this->review_reader->get($review_id);
        if ($review === null) {
            return null;
        }
        foreach ((array) ($review['next']['evidence_inventory'] ?? []) as $evidence) {
            if (is_array($evidence) && ($evidence['id'] ?? '') === $evidence_id) {
                return $evidence;
            }
        }
        return null;
    }
}