<?php

namespace App\Models;

use Illuminate\Database\Eloquent\Factories\HasFactory;
use Illuminate\Database\Eloquent\Model;
use Illuminate\Database\Eloquent\Relations\BelongsTo;
use Illuminate\Database\Eloquent\Relations\HasMany;
use Illuminate\Database\Eloquent\SoftDeletes;

class HostingNode extends Model
{
    use HasFactory, SoftDeletes;

    protected $fillable = [
        'name',
        'hostname',
        'ip_address',
        'ipv6_address',
        'type',
        'role',
        'primary_hosting_node_id',
        'segment',
        'provider',
        'provider_instance_id',
        'region',
        'datacenter',
        'cpu_cores',
        'ram_mb',
        'disk_gb',
        'oversell_ratio',
        'allocated_disk_gb',
        'used_disk_gb',
        'bandwidth_tb',
        'max_accounts',
        'current_accounts',
        'current_load_percent',
        'status',
        'features',
        'installed_software',
        'ssh_port',
        'ssh_private_key',
        'control_panel',
        'last_health_check_at',
        'health_status',
    ];

    protected $casts = [
        'features' => 'array',
        'installed_software' => 'array',
        'health_status' => 'array',
        'last_health_check_at' => 'datetime',
        'cpu_cores' => 'integer',
        'ram_mb' => 'integer',
        'disk_gb' => 'integer',
        'oversell_ratio' => 'decimal:2',
        'allocated_disk_gb' => 'integer',
        'used_disk_gb' => 'integer',
        'bandwidth_tb' => 'integer',
        'max_accounts' => 'integer',
        'current_accounts' => 'integer',
        'current_load_percent' => 'decimal:2',
    ];

    protected $hidden = [
        'ssh_private_key',
    ];

    public const ROLE_PRIMARY = 'primary';

    public const ROLE_EXTENSION = 'extension';

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

    public const SEGMENT_GENERAL = 'general';
    public const SEGMENT_STARTER = 'starter';
    public const SEGMENT_WORDPRESS = 'wordpress';
    public const SEGMENT_HIGH_RESOURCE = 'high_resource';

    public const PROVIDER_CONTABO = 'contabo';
    public const PROVIDER_LOCAL = 'local';
    public const PROVIDER_MANUAL = 'manual';
    public const PROVIDER_LEGACY_RC = 'legacy_rc';

    public const STATUS_PROVISIONING = 'provisioning';
    public const STATUS_ACTIVE = 'active';
    public const STATUS_MAINTENANCE = 'maintenance';
    public const STATUS_FULL = 'full';
    public const STATUS_DECOMMISSIONED = 'decommissioned';

    public function primary(): BelongsTo
    {
        return $this->belongsTo(self::class, 'primary_hosting_node_id');
    }

    public function extensions(): HasMany
    {
        return $this->hasMany(self::class, 'primary_hosting_node_id');
    }

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

    public function isPrimary(): bool
    {
        return ($this->role ?? self::ROLE_PRIMARY) === self::ROLE_PRIMARY;
    }

    public function isExtension(): bool
    {
        return $this->role === self::ROLE_EXTENSION;
    }

    public function poolRoot(): self
    {
        return $this->isExtension() && $this->primary
            ? $this->primary
            : $this;
    }

    public function isAvailable(): bool
    {
        if ($this->status !== self::STATUS_ACTIVE) {
            return false;
        }

        if ($this->max_accounts && $this->current_accounts >= $this->max_accounts) {
            return false;
        }

        return true;
    }

    public function supportsSegment(?string $segment): bool
    {
        if ($segment === null || $segment === '') {
            return true;
        }

        return in_array($this->segment, [$segment, self::SEGMENT_GENERAL], true);
    }

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

        $ratio = (float) ($this->oversell_ratio ?: 1);

        return round($this->disk_gb * max($ratio, 1), 2);
    }

    public function logicalCapacityPercent(): float
    {
        $logicalCapacity = $this->logicalCapacityGb();

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

        return round(($this->allocated_disk_gb / $logicalCapacity) * 100, 2);
    }

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

        return round(($this->used_disk_gb / $this->disk_gb) * 100, 2);
    }

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

        return round(($this->current_accounts / $this->max_accounts) * 100, 2);
    }

    public function hasLogicalCapacityFor(int $requestedDiskGb = 0): bool
    {
        if ($requestedDiskGb <= 0) {
            return true;
        }

        if (! $this->disk_gb || $this->disk_gb <= 0) {
            return false;
        }

        return ($this->used_disk_gb + $requestedDiskGb) <= $this->disk_gb;
    }

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

        return max($this->disk_gb - $this->used_disk_gb, 0);
    }

    public function canProvision(int $requestedDiskGb = 0, ?string $segment = null): bool
    {
        if (! $this->isAvailable()) {
            return false;
        }

        if (! $this->supportsSegment($segment)) {
            return false;
        }

        return $this->hasLogicalCapacityFor($requestedDiskGb);
    }

    public function incrementAccountCount(): void
    {
        $this->increment('current_accounts');

        if ($this->max_accounts && $this->current_accounts >= $this->max_accounts) {
            $this->update(['status' => self::STATUS_FULL]);
        }
    }

    public function decrementAccountCount(): void
    {
        $this->decrement('current_accounts');

        if ($this->status === self::STATUS_FULL && $this->current_accounts < $this->max_accounts) {
            $this->update(['status' => self::STATUS_ACTIVE]);
        }
    }

    public function scopeAvailable($query)
    {
        return $query->where('status', self::STATUS_ACTIVE)
            ->whereRaw('current_accounts < COALESCE(max_accounts, 999999)');
    }

    public function scopeOfType($query, string $type)
    {
        return $query->where('type', $type);
    }
}