<?php

declare(strict_types=1);

namespace Core\Tenant\Concerns;

use Core\Tenant\Models\Boost;
use Illuminate\Database\Eloquent\Relations\HasMany;

/**
 * Page-related relationships for the User model.
 *
 * Requires the Page module (Core\Mod\Social or equivalent) to be installed.
 * All relationships are guarded with class_exists() so the tenant package
 * remains functional even when the Page module is absent.
 *
 * @mixin \Core\Tenant\Models\User
 */
trait HasPageRelationships
{
    /**
     * Get all pages owned by this user.
     */
    public function pages(): ?HasMany
    {
        $class = $this->resolvePageModel();

        if (! $class) {
            return null;
        }

        return $this->hasMany($class);
    }

    /**
     * Get all page projects (folders) owned by this user.
     */
    public function pageProjects(): ?HasMany
    {
        $class = $this->resolvePageProjectModel();

        if (! $class) {
            return null;
        }

        return $this->hasMany($class);
    }

    /**
     * Get all custom domains owned by this user.
     */
    public function pageDomains(): ?HasMany
    {
        $class = $this->resolvePageDomainModel();

        if (! $class) {
            return null;
        }

        return $this->hasMany($class);
    }

    /**
     * Get all tracking pixels owned by this user.
     */
    public function pagePixels(): ?HasMany
    {
        $class = $this->resolvePagePixelModel();

        if (! $class) {
            return null;
        }

        return $this->hasMany($class);
    }

    /**
     * Get the user's bio.pages entitlement (base + boosts).
     */
    public function getBioPagesLimit(): int
    {
        // Base: 1 page for all tiers
        $base = 1;

        // Add from boosts
        $boostPages = $this->boosts()
            ->where('feature_code', 'bio.pages')
            ->where('status', Boost::STATUS_ACTIVE)
            ->sum('limit_value');

        return $base + (int) $boostPages;
    }

    /**
     * Check if user can create more bio pages.
     */
    public function canCreateBioPage(): bool
    {
        $pages = $this->pages();

        if (! $pages) {
            return false;
        }

        return $pages->rootPages()->count() < $this->getBioPagesLimit();
    }

    /**
     * Get remaining bio page slots.
     */
    public function remainingBioPageSlots(): int
    {
        $pages = $this->pages();

        if (! $pages) {
            return 0;
        }

        return max(0, $this->getBioPagesLimit() - $pages->rootPages()->count());
    }

    /**
     * Get the user's sub-page limit (0 base + boosts).
     */
    public function getSubPagesLimit(): int
    {
        // Base: 0 sub-pages (free tier)
        $base = 0;

        // Add from boosts
        $boostPages = $this->boosts()
            ->where('feature_code', 'webpage.sub_pages')
            ->where('status', Boost::STATUS_ACTIVE)
            ->sum('limit_value');

        return $base + (int) $boostPages;
    }

    /**
     * Get the total sub-pages count across all root pages.
     */
    public function getSubPagesCount(): int
    {
        $pages = $this->pages();

        if (! $pages) {
            return 0;
        }

        return $pages->subPages()->count();
    }

    /**
     * Check if user can create more sub-pages.
     */
    public function canCreateSubPage(): bool
    {
        return $this->getSubPagesCount() < $this->getSubPagesLimit();
    }

    /**
     * Get remaining sub-page slots.
     */
    public function remainingSubPageSlots(): int
    {
        return max(0, $this->getSubPagesLimit() - $this->getSubPagesCount());
    }

    /**
     * Resolve the Page model class, checking common namespaces.
     */
    protected function resolvePageModel(): ?string
    {
        foreach ($this->getPageModelCandidates('Page') as $candidate) {
            if (class_exists($candidate)) {
                return $candidate;
            }
        }

        return null;
    }

    /**
     * Resolve the Project model class, checking common namespaces.
     */
    protected function resolvePageProjectModel(): ?string
    {
        foreach ($this->getPageModelCandidates('Project') as $candidate) {
            if (class_exists($candidate)) {
                return $candidate;
            }
        }

        return null;
    }

    /**
     * Resolve the Domain model class, checking common namespaces.
     */
    protected function resolvePageDomainModel(): ?string
    {
        foreach ($this->getPageModelCandidates('Domain') as $candidate) {
            if (class_exists($candidate)) {
                return $candidate;
            }
        }

        return null;
    }

    /**
     * Resolve the Pixel model class, checking common namespaces.
     */
    protected function resolvePagePixelModel(): ?string
    {
        foreach ($this->getPageModelCandidates('Pixel') as $candidate) {
            if (class_exists($candidate)) {
                return $candidate;
            }
        }

        return null;
    }

    /**
     * Get candidate class names for a Page module model.
     *
     * @return list<string>
     */
    protected function getPageModelCandidates(string $model): array
    {
        return [
            "Core\\Mod\\Social\\Models\\{$model}",
            "App\\Models\\{$model}",
        ];
    }
}