<?php

declare(strict_types=1);

namespace Agent001\Config;

\defined( 'ABSPATH' ) || exit;

final class Settings
{
    public const OPTION_NAME = 'agent001_settings';

    public const API_URL = 'https://app.agent001.ai/api/v1/ingest';

    public const DEFAULTS = [
        'api_key'                    => '',
        'widget_key'                 => '',
        'connected_site'             => '',
        'account_name'               => '',
        'sync_categories'            => [],
        'selected_agent_ids'         => [],
        'selected_agent_embed_token' => '',
        'selected_agent_active'      => true,
    ];

    private ?array $cached = null;

    public function all(): array
    {
        if ( $this->cached === null ) {
            $stored       = \get_option( self::OPTION_NAME, [] );
            $this->cached = array_merge( self::DEFAULTS, is_array( $stored ) ? $stored : [] );
        }

        return $this->cached;
    }

    public function save( array $data ): void
    {
        \update_option( self::OPTION_NAME, $data );
        $this->cached = null;
    }

    public function apiUrl(): string
    {
        $url = \defined( 'AGENT001_API_URL' ) ? (string) \AGENT001_API_URL : self::API_URL;

        return (string) \apply_filters( 'agent001_api_url', $url );
    }

    public function connectUrl(): string
    {
        $url = \rtrim( $this->backendBaseUrl(), '/' ) . '/connect';

        return (string) \apply_filters( 'agent001_connect_url', $url );
    }

    public function exchangeUrl(): string
    {
        $url = \rtrim( $this->backendBaseUrl(), '/' ) . '/connect/exchange';

        return (string) \apply_filters( 'agent001_exchange_url', $url );
    }

    public function productEndpoint( int $productId ): string
    {
        $url = \rtrim( $this->backendBaseUrl(), '/' ) . '/api/v1/ingest/products/' . \rawurlencode( (string) $productId );

        return (string) \apply_filters( 'agent001_product_endpoint', $url, $productId );
    }

    public function syncSessionUrl( string $sessionId ): string
    {
        $url = \rtrim( $this->apiUrl(), '/' ) . '/sessions/' . \rawurlencode( $sessionId );

        return (string) \apply_filters( 'agent001_sync_session_url', $url, $sessionId );
    }

    public function agentsUrl(): string
    {
        $url = \rtrim( $this->backendBaseUrl(), '/' ) . '/api/v1/integrations/me/agents';

        return (string) \apply_filters( 'agent001_agents_url', $url );
    }

    public function agentDomainUrl( string $agentId ): string
    {
        $url = \rtrim( $this->backendBaseUrl(), '/' ) . '/api/v1/integrations/me/agents/' . \rawurlencode( AgentId::normalize( $agentId ) ) . '/domain';

        return (string) \apply_filters( 'agent001_agent_domain_url', $url, $agentId );
    }

    public function agentActiveUrl( string $agentId ): string
    {
        $url = \rtrim( $this->backendBaseUrl(), '/' ) . '/api/v1/integrations/me/agents/' . \rawurlencode( AgentId::normalize( $agentId ) ) . '/active';

        return (string) \apply_filters( 'agent001_agent_active_url', $url, $agentId );
    }

    public function apiKey(): string
    {
        if ( \defined( 'AGENT001_API_KEY' ) ) {
            return (string) \AGENT001_API_KEY;
        }

        return (string) \apply_filters( 'agent001_api_key', (string) $this->all()['api_key'] );
    }

    public function setApiKey( string $apiKey ): void
    {
        $current = $this->all();
        $current['api_key'] = $apiKey;
        $this->save( $current );
    }

    public function connectedSite(): string
    {
        return (string) ( $this->all()['connected_site'] ?? '' );
    }

    public function setConnectedSite( string $site ): void
    {
        $current = $this->all();
        $current['connected_site'] = $site;
        $this->save( $current );
    }

    public function accountName(): string
    {
        return (string) ( $this->all()['account_name'] ?? '' );
    }

    public function setAccountName( string $name ): void
    {
        $current = $this->all();
        $current['account_name'] = $name;
        $this->save( $current );
    }

    /**
     * @return int[]
     */
    public function syncCategories(): array
    {
        $raw = $this->all()['sync_categories'] ?? [];
        if ( ! is_array( $raw ) ) {
            return [];
        }

        $ids = [];
        foreach ( $raw as $value ) {
            $id = (int) $value;
            if ( $id > 0 ) {
                $ids[] = $id;
            }
        }

        return array_values( array_unique( $ids ) );
    }

    /**
     * @param int[] $ids
     */
    public function setSyncCategories( array $ids ): void
    {
        $clean = [];
        foreach ( $ids as $value ) {
            $id = (int) $value;
            if ( $id > 0 ) {
                $clean[] = $id;
            }
        }

        $current = $this->all();
        $current['sync_categories'] = array_values( array_unique( $clean ) );
        $this->save( $current );
    }

    /**
     * @return list<string>
     */
    public function selectedAgentIds(): array
    {
        $raw = $this->all()['selected_agent_ids'] ?? [];

        return is_array( $raw ) ? AgentId::normalizeList( $raw ) : [];
    }

    /**
     * @param array<mixed> $ids
     */
    public function setSelectedAgentIds( array $ids ): void
    {
        $current = $this->all();
        $current['selected_agent_ids'] = AgentId::normalizeList( $ids );
        $this->save( $current );
    }

    public function hasSelectedAgents(): bool
    {
        return $this->selectedAgentIds() !== [];
    }

    public function selectedAgentEmbedToken(): string
    {
        if ( ! $this->hasSelectedAgents() ) {
            return '';
        }

        return (string) ( $this->all()['selected_agent_embed_token'] ?? '' );
    }

    public function setSelectedAgentEmbedToken( string $token ): void
    {
        $current = $this->all();
        $current['selected_agent_embed_token'] = $token;
        $this->save( $current );
    }

    public function selectedAgentIsActive(): bool
    {
        return (bool) ( $this->all()['selected_agent_active'] ?? true );
    }

    public function setSelectedAgentActive( bool $active ): void
    {
        $current = $this->all();
        $current['selected_agent_active'] = $active;
        $this->save( $current );
    }

    public function widgetLoaderUrl(): string
    {
        $url = \rtrim( $this->backendBaseUrl(), '/' ) . '/embed/loader.js';

        return (string) \apply_filters( 'agent001_widget_loader_url', $url );
    }

    public function widgetKey(): string
    {
        $key = (string) ( $this->all()['widget_key'] ?? '' );
        if ( $key !== '' ) {
            return $key;
        }

        try {
            $key = \bin2hex( \random_bytes( 32 ) );
        } catch ( \Throwable $e ) {
            $key = \wp_generate_password( 64, false, false );
        }

        $current = $this->all();
        $current['widget_key'] = $key;
        $this->save( $current );

        return $key;
    }

    public function setWidgetKey( string $key ): void
    {
        $current = $this->all();
        $current['widget_key'] = $key;
        $this->save( $current );
    }

    public function backendBaseUrl(): string
    {
        $apiUrl = $this->apiUrl();
        $parts  = \wp_parse_url( $apiUrl );

        if ( ! is_array( $parts ) || empty( $parts['scheme'] ) || empty( $parts['host'] ) ) {
            return 'https://app.agent001.ai';
        }

        $base = $parts['scheme'] . '://' . $parts['host'];
        if ( ! empty( $parts['port'] ) ) {
            $base .= ':' . $parts['port'];
        }

        return $base;
    }

    public function apiKeyIsLocked(): bool
    {
        return \defined( 'AGENT001_API_KEY' );
    }

    public function hasApiKey(): bool
    {
        return $this->apiKey() !== '';
    }

}