<?php

namespace App\Models;

use Carbon\CarbonInterface;
use Illuminate\Database\Eloquent\Collection;
use Illuminate\Database\Eloquent\Factories\HasFactory;
use Illuminate\Database\Eloquent\Relations\BelongsToMany;
use Illuminate\Database\Eloquent\Model;
use Illuminate\Database\Eloquent\Relations\BelongsTo;
use Illuminate\Database\Eloquent\Relations\HasMany;
use Illuminate\Database\Eloquent\Relations\HasOne;
use Illuminate\Database\Eloquent\SoftDeletes;
use Illuminate\Support\Facades\Schema;

class HostingAccount extends Model
{
    use HasFactory, SoftDeletes;

    public const TYPE_SHARED = 'shared';
    public const TYPE_VPS = 'vps';
    public const TYPE_DEDICATED = 'dedicated';

    public const STATUS_PENDING = 'pending';
    public const STATUS_PROVISIONING = 'provisioning';
    public const STATUS_ACTIVE = 'active';
    public const STATUS_SUSPENDED = 'suspended';
    public const STATUS_TERMINATED = 'terminated';
    public const STATUS_FAILED = 'failed';

    public const RESOURCE_STATUS_ACTIVE = 'active';
    public const RESOURCE_STATUS_THROTTLED = 'throttled';
    public const RESOURCE_STATUS_SUSPENDED = 'suspended';

    public const GRACE_PERIOD_MONTHS = 3;

    protected $fillable = [
        'platform_id',
        'user_id',
        'hosting_product_id',
        'hosting_node_id',
        'username',
        'primary_domain',
        'type',
        'status',
        'provider_account_id',
        'home_directory',
        'allocated_disk_gb',
        'disk_used_bytes',
        'inode_count',
        'cpu_usage_percent',
        'memory_used_mb',
        'process_count',
        'io_usage_mb',
        'last_usage_sync_at',
        'bandwidth_used_bytes',
        'bandwidth_reset_at',
        'php_version',
        'cpu_limit_percent',
        'memory_limit_mb',
        'process_limit',
        'io_limit_mb',
        'inode_limit',
        'resource_status',
        'uploads_restricted',
        'is_flagged',
        'warning_count',
        'cpu_breach_streak',
        'memory_breach_streak',
        'process_breach_streak',
        'io_breach_streak',
        'inode_breach_streak',
        'last_warning_at',
        'last_resource_breach_at',
        'throttled_at',
        'features_enabled',
        'resource_limits',
        'suspension_reason',
        'suspended_at',
        'provisioned_at',
        'expires_at',
        'metadata',
    ];

    protected $casts = [
        'features_enabled' => 'array',
        'resource_limits' => 'array',
        'metadata' => 'array',
        'allocated_disk_gb' => 'integer',
        'inode_count' => 'integer',
        'cpu_usage_percent' => 'decimal:2',
        'memory_used_mb' => 'integer',
        'process_count' => 'integer',
        'io_usage_mb' => 'decimal:2',
        'cpu_limit_percent' => 'integer',
        'memory_limit_mb' => 'integer',
        'process_limit' => 'integer',
        'io_limit_mb' => 'integer',
        'inode_limit' => 'integer',
        'uploads_restricted' => 'boolean',
        'is_flagged' => 'boolean',
        'warning_count' => 'integer',
        'cpu_breach_streak' => 'integer',
        'memory_breach_streak' => 'integer',
        'process_breach_streak' => 'integer',
        'io_breach_streak' => 'integer',
        'inode_breach_streak' => 'integer',
        'last_usage_sync_at' => 'datetime',
        'last_warning_at' => 'datetime',
        'last_resource_breach_at' => 'datetime',
        'throttled_at' => 'datetime',
        'bandwidth_reset_at' => 'datetime',
        'suspended_at' => 'datetime',
        'provisioned_at' => 'datetime',
        'expires_at' => 'datetime',
    ];

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

    public function product(): BelongsTo
    {
        return $this->belongsTo(HostingProduct::class, 'hosting_product_id');
    }

    public function node(): BelongsTo
    {
        return $this->belongsTo(HostingNode::class, 'hosting_node_id');
    }

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

    /** Primary label for UI lists — prefers linked hosted_sites over primary_domain. */
    public function linkedDomainLabel(): ?string
    {
        if ($this->relationLoaded('sites') && $this->sites->isNotEmpty()) {
            $domains = $this->sites->pluck('domain')->filter()->unique()->values();

            if ($domains->count() === 1) {
                return (string) $domains->first();
            }

            $preview = $domains->take(2)->implode(', ');

            return $domains->count() > 2
                ? "{$preview} +".($domains->count() - 2)
                : $preview;
        }

        return filled($this->primary_domain) ? (string) $this->primary_domain : null;
    }

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

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

    public function developers(): BelongsToMany
    {
        return $this->belongsToMany(User::class, 'hosting_account_members')
            ->withPivot(['role', 'invited_by_user_id', 'invited_at'])
            ->withTimestamps();
    }

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

    public function mailboxes(): HasMany
    {
        return $this->hasMany(Mailbox::class, 'hosting_account_id');
    }

    /** The extracted hosting app does not store mailboxes locally — they live on Ladill Email. */
    public static function tracksLocalMailboxes(): bool
    {
        static $hasTable = null;

        return $hasTable ??= Schema::hasTable('mailboxes');
    }

    /** @return Collection<int, Mailbox> */
    public function loadedMailboxes(): Collection
    {
        if (! static::tracksLocalMailboxes()) {
            return new Collection;
        }

        if (! $this->relationLoaded('mailboxes')) {
            $this->load('mailboxes');
        }

        return $this->mailboxes;
    }

    public function billingInvoices(): HasMany
    {
        return $this->hasMany(HostingBillingInvoice::class, 'hosting_account_id');
    }

    public function planChanges(): HasMany
    {
        return $this->hasMany(HostingPlanChange::class, 'hosting_account_id');
    }

    public function latestOrder(): HasOne
    {
        return $this->hasOne(CustomerHostingOrder::class, 'hosting_account_id')->latestOfMany();
    }

    public function isActive(): bool
    {
        return $this->status === 'active';
    }

    public function scopeActive($query)
    {
        return $query->where('status', 'active');
    }

    public function isThrottled(): bool
    {
        return $this->resource_status === self::RESOURCE_STATUS_THROTTLED;
    }

    public function uploadsAreRestricted(): bool
    {
        return (bool) $this->uploads_restricted || (
            $this->inode_limit > 0 && $this->inode_count >= $this->inode_limit
        );
    }

    public function assignedDurationMonths(): ?int
    {
        $months = data_get($this->metadata, 'assigned_duration_months');

        return is_numeric($months) && (int) $months > 0 ? (int) $months : null;
    }

    public function canBeRenewed(): bool
    {
        return $this->assignedDurationMonths() !== null;
    }

    public function requestedDiskGb(): int
    {
        if ($this->allocated_disk_gb > 0) {
            return (int) $this->allocated_disk_gb;
        }

        return (int) ($this->product?->disk_gb
            ?? data_get($this->resource_limits, 'disk_gb')
            ?? 0);
    }

    public function diskLimitBytes(): int
    {
        return max($this->requestedDiskGb(), 0) * 1073741824;
    }

    public function diskUsagePercent(): float
    {
        $limit = $this->diskLimitBytes();

        if ($limit <= 0) {
            return 0;
        }

        return round(($this->disk_used_bytes / $limit) * 100, 2);
    }

    public function inodeUsagePercent(): float
    {
        if (! $this->inode_limit || $this->inode_limit <= 0) {
            return 0;
        }

        return round(($this->inode_count / $this->inode_limit) * 100, 2);
    }

    public function includedEmailAccounts(): ?int
    {
        $limit = $this->product?->max_email_accounts;

        if ($limit === null) {
            $limit = data_get($this->resource_limits, 'max_email_accounts');
        }

        return $limit === null ? null : (int) $limit;
    }

    public function freeEmailAllowance(): ?int
    {
        $included = $this->includedEmailAccounts();

        if ($included === null || $included < 0) {
            return null;
        }

        return max($included, 0);
    }

    /**
     * Domain slot limit from resource limits / product. -1 means unlimited.
     */
    public function maxDomainsLimit(): int
    {
        $limit = data_get($this->resource_limits, 'max_domains');
        if ($limit === null) {
            $limit = $this->product?->max_domains;
        }

        if ($limit === null) {
            return 1;
        }

        return (int) $limit;
    }

    /**
     * Subdomain slot limit: max_domains × 5. Unlimited domains → unlimited subdomains.
     */
    public function maxSubdomainsLimit(): int
    {
        $maxDomains = $this->maxDomainsLimit();

        return $maxDomains === -1 ? -1 : max(0, $maxDomains) * 5;
    }

    public function domainSitesCount(): int
    {
        return $this->sites()
            ->whereIn('type', ['primary', 'addon'])
            ->count();
    }

    public function subdomainSitesCount(): int
    {
        return $this->sites()
            ->where('type', 'subdomain')
            ->count();
    }

    public function canAddDomain(): bool
    {
        $limit = $this->maxDomainsLimit();

        return $limit === -1 || $this->domainSitesCount() < $limit;
    }

    public function canAddSubdomain(): bool
    {
        $limit = $this->maxSubdomainsLimit();

        return $limit === -1 || $this->subdomainSitesCount() < $limit;
    }

    public function paidMailboxCount(): int
    {
        if (! static::tracksLocalMailboxes()) {
            return 0;
        }

        return $this->loadedMailboxes()->where('is_paid', true)->count();
    }

    public function renew(?int $durationMonths = null, array $metadata = []): void
    {
        $months = $durationMonths ?? $this->assignedDurationMonths();

        if (! is_int($months) || $months < 1) {
            return;
        }

        $baseDate = $this->expires_at instanceof CarbonInterface && $this->expires_at->isFuture()
            ? $this->expires_at->copy()
            : now();

        $currentMetadata = (array) ($this->metadata ?? []);

        $mergedMetadata = array_merge($currentMetadata, $metadata, [
            'assigned_duration_months' => $months,
        ]);
        unset($mergedMetadata['expiry_alerts_sent']);

        $this->update([
            'expires_at' => $baseDate->addMonthsNoOverflow($months),
            'metadata' => $mergedMetadata,
        ]);
    }

    public function isExpired(): bool
    {
        return $this->expires_at instanceof CarbonInterface && $this->expires_at->isPast();
    }

    public function isInGracePeriod(): bool
    {
        if (! $this->isExpired()) {
            return false;
        }

        return $this->gracePeriodEndsAt()->isFuture();
    }

    public function gracePeriodEndsAt(): ?CarbonInterface
    {
        if (! $this->expires_at instanceof CarbonInterface) {
            return null;
        }

        return $this->expires_at->copy()->addMonths(self::GRACE_PERIOD_MONTHS);
    }

    public function isPastGracePeriod(): bool
    {
        $endsAt = $this->gracePeriodEndsAt();

        return $endsAt !== null && $endsAt->isPast();
    }
}