<?php

namespace App\Models;

use Illuminate\Database\Eloquent\Model;
use Illuminate\Database\Eloquent\Relations\BelongsTo;
use Illuminate\Database\Eloquent\Relations\HasMany;
use Illuminate\Http\Request;

class ShortLink extends Model
{
    protected $fillable = [
        'user_id',
        'campaign_id',
        'source_app',
        'source_kind',
        'source_ref',
        'slug',
        'label',
        'destination_url',
        'manage_url',
        'is_managed_here',
        'is_active',
        'clicks_total',
        'unique_clicks_total',
        'last_clicked_at',
        'expires_at',
    ];

    protected $casts = [
        'is_managed_here' => 'boolean',
        'is_active' => 'boolean',
        'clicks_total' => 'integer',
        'unique_clicks_total' => 'integer',
        'last_clicked_at' => 'datetime',
        'expires_at' => 'datetime',
    ];

    public function user(): BelongsTo
    {
        return $this->belongsTo(User::class);
    }

    public function campaign(): BelongsTo
    {
        return $this->belongsTo(Campaign::class);
    }

    public function clicks(): HasMany
    {
        return $this->hasMany(LinkClick::class);
    }

    /**
     * Shareable short URL for this slug — always derived at runtime from the
     * owner's default domain (custom or platform), never stored.
     */
    public function publicUrl(?User $owner = null): string
    {
        $owner ??= $this->user;
        $base = $owner ? $owner->publicLinkBaseUrl() : self::publicBaseUrl();

        return rtrim($base, '/').'/'.$this->slug;
    }

    public static function publicHost(): string
    {
        return strtolower((string) config('link.public_domain', 'ladl.link'));
    }

    public static function publicBaseUrl(): string
    {
        return 'https://'.self::publicHost();
    }

    /**
     * Build the live redirect target: current destination_url plus any path
     * suffix and query string from the inbound request (query keys on the
     * short link override destination keys when both are set).
     */
    public function resolveRedirectUrl(Request $request, ?string $path = null): string
    {
        $base = trim((string) $this->destination_url);
        if ($base === '') {
            return $this->publicUrl();
        }

        $suffix = $path !== null ? trim($path, '/') : '';
        if ($suffix !== '') {
            $parsed = parse_url($base);
            $basePath = rtrim((string) ($parsed['path'] ?? ''), '/');
            $rebuilt = ($parsed['scheme'] ?? 'https').'://'.($parsed['host'] ?? '');
            if (! empty($parsed['port'])) {
                $rebuilt .= ':'.$parsed['port'];
            }
            $rebuilt .= $basePath.'/'.$suffix;
            if (! empty($parsed['query'])) {
                $rebuilt .= '?'.$parsed['query'];
            }
            if (! empty($parsed['fragment'])) {
                $rebuilt .= '#'.$parsed['fragment'];
            }
            $base = $rebuilt;
        }

        $requestQuery = $request->query();
        if ($requestQuery === []) {
            return $base;
        }

        $parts = parse_url($base);
        $existing = [];
        if (! empty($parts['query'])) {
            parse_str((string) $parts['query'], $existing);
        }

        // Inbound short-link params win so campaigns can override destination defaults.
        $merged = array_merge($existing, $requestQuery);
        $query = http_build_query($merged);

        $target = ($parts['scheme'] ?? 'https').'://'.($parts['host'] ?? '');
        if (! empty($parts['port'])) {
            $target .= ':'.$parts['port'];
        }
        $target .= $parts['path'] ?? '';
        if ($query !== '') {
            $target .= '?'.$query;
        }
        if (! empty($parts['fragment'])) {
            $target .= '#'.$parts['fragment'];
        }

        return $target;
    }

    public function isExpired(): bool
    {
        return $this->expires_at !== null && $this->expires_at->isPast();
    }

    /** Simple URL redirects created in Link; QR ecosystem slugs resolve via the platform proxy. */
    public function isDirectRedirect(): bool
    {
        return $this->is_managed_here && $this->source_kind === 'redirect';
    }

    public function sourceAppLabel(): string
    {
        return match ($this->source_app) {
            'link' => 'Ladill Link',
            'qrplus' => 'QR Plus',
            'merchant' => 'Merchant',
            'events' => 'Events',
            'mini' => 'Mini',
            'give' => 'Give',
            'transfer' => 'Transfer',
            'platform' => 'Ladill',
            default => ucfirst((string) $this->source_app),
        };
    }
}