<?php

declare(strict_types=1);

namespace App\Support\Rbac\Actions;

use App\Models\ManagedEnvironment;
use App\Models\Workspace;
use Illuminate\Database\Eloquent\Model;
use RuntimeException;

final readonly class UiActionContext
{
    public const string CONTEXT_MISSING = 'context_missing';

    public const string WORKSPACE_MISSING = 'workspace_missing';

    public const string ENVIRONMENT_MISSING = 'environment_missing';

    private function __construct(
        public UiActionScope $scope,
        public UiActionContextSource $source,
        private ?Workspace $workspace = null,
        private ?ManagedEnvironment $environment = null,
        private ?Model $record = null,
        private ?string $missingReason = null,
    ) {}

    public static function forWorkspace(?Workspace $workspace, UiActionContextSource $source = UiActionContextSource::Explicit): self
    {
        if (! $workspace instanceof Workspace) {
            return self::missing(self::WORKSPACE_MISSING, $source);
        }

        return new self(
            scope: UiActionScope::Workspace,
            source: $source,
            workspace: $workspace,
        );
    }

    public static function forEnvironment(?ManagedEnvironment $environment, UiActionContextSource $source = UiActionContextSource::Explicit): self
    {
        if (! $environment instanceof ManagedEnvironment) {
            return self::missing(self::ENVIRONMENT_MISSING, $source);
        }

        return new self(
            scope: UiActionScope::Environment,
            source: $source,
            workspace: $environment->workspace,
            environment: $environment,
        );
    }

    public static function forRecord(Model $record, UiActionContextSource $source = UiActionContextSource::Record): self
    {
        $environment = self::environmentFromRecord($record);

        return new self(
            scope: UiActionScope::Record,
            source: $source,
            workspace: $environment?->workspace,
            environment: $environment,
            record: $record,
        );
    }

    public static function forSystem(UiActionContextSource $source = UiActionContextSource::Explicit): self
    {
        return new self(
            scope: UiActionScope::System,
            source: $source,
        );
    }

    public static function missing(
        string $reason = self::CONTEXT_MISSING,
        UiActionContextSource $source = UiActionContextSource::Missing,
    ): self {
        return new self(
            scope: UiActionScope::Missing,
            source: $source,
            missingReason: $reason === '' ? self::CONTEXT_MISSING : $reason,
        );
    }

    public function isMissing(): bool
    {
        return $this->scope === UiActionScope::Missing || $this->missingReason !== null;
    }

    public function missingReason(): ?string
    {
        return $this->missingReason;
    }

    public function workspace(): ?Workspace
    {
        return $this->workspace;
    }

    public function environment(): ?ManagedEnvironment
    {
        return $this->environment;
    }

    public function tenant(): ?ManagedEnvironment
    {
        return $this->environment();
    }

    public function record(): ?Model
    {
        return $this->record;
    }

    public function requireWorkspace(): Workspace
    {
        if ($this->workspace instanceof Workspace) {
            return $this->workspace;
        }

        throw new RuntimeException($this->missingReason ?? self::WORKSPACE_MISSING);
    }

    public function requireEnvironment(): ManagedEnvironment
    {
        if ($this->environment instanceof ManagedEnvironment) {
            return $this->environment;
        }

        throw new RuntimeException($this->missingReason ?? self::ENVIRONMENT_MISSING);
    }

    private static function environmentFromRecord(Model $record): ?ManagedEnvironment
    {
        if ($record instanceof ManagedEnvironment) {
            return $record;
        }

        if (method_exists($record, 'relationLoaded') && $record->relationLoaded('tenant')) {
            $tenant = $record->getRelation('tenant');

            if ($tenant instanceof ManagedEnvironment) {
                return $tenant;
            }
        }

        if (method_exists($record, 'tenant')) {
            $tenant = $record->getAttribute('tenant');

            if ($tenant instanceof ManagedEnvironment) {
                return $tenant;
            }
        }

        return null;
    }
}