<?php

declare(strict_types=1);

namespace App\Support\Operations\Actionability;

use App\Models\OperationRun;
use App\Models\ProviderConnection;
use App\Support\OperationCatalog;
use App\Support\OperationRunOutcome;
use App\Support\OperationRunStatus;
use BackedEnum;
use Illuminate\Support\Collection;

final class OperationRunActionabilityEvaluationContext
{
    /** @var Collection<int, OperationRun>|null */
    private ?Collection $laterSuccessfulRuns = null;

    /** @var Collection<int, ProviderConnection>|null */
    private ?Collection $providerConnections = null;

    /**
     * @param  Collection<int, OperationRun>  $runs
     */
    public function __construct(
        private readonly Collection $runs,
        private readonly ?OperationRunActionabilityRegistry $registry = null,
    ) {}

    /**
     * @param  list<string>  $canonicalTypes
     * @param  list<string>  $matchContextKeys
     */
    public function laterSuccessfulRun(
        OperationRun $run,
        array $canonicalTypes,
        array $matchContextKeys = [],
    ): ?OperationRun {
        $canonicalTypes = array_values(array_unique(array_filter($canonicalTypes, static fn (string $type): bool => trim($type) !== '')));

        if ($canonicalTypes === []) {
            return null;
        }

        return $this->laterSuccessfulRuns()
            ->first(function (OperationRun $candidate) use ($run, $canonicalTypes, $matchContextKeys): bool {
                if ((int) $candidate->getKey() === (int) $run->getKey()) {
                    return false;
                }

                if (! in_array($candidate->canonicalOperationType(), $canonicalTypes, true)) {
                    return false;
                }

                if (! $this->sameScope($run, $candidate)) {
                    return false;
                }

                if (! $this->isLater($run, $candidate)) {
                    return false;
                }

                foreach ($matchContextKeys as $key) {
                    $left = data_get($run->context, $key);
                    $right = data_get($candidate->context, $key);

                    if ($left === null && $right === null) {
                        continue;
                    }

                    if ((string) $left !== (string) $right) {
                        return false;
                    }
                }

                return true;
            });
    }

    public function healthyProviderConnection(OperationRun $run): ?ProviderConnection
    {
        $connectionId = data_get($run->context, 'provider_connection_id');

        if (! is_numeric($connectionId)) {
            return null;
        }

        $connection = $this->providerConnections()->get((int) $connectionId);

        if (! $connection instanceof ProviderConnection) {
            return null;
        }

        if ((int) $connection->workspace_id !== (int) $run->workspace_id) {
            return null;
        }

        if ((int) $connection->managed_environment_id !== (int) $run->managed_environment_id) {
            return null;
        }

        if (! $connection->is_enabled) {
            return null;
        }

        return $this->enumValue($connection->consent_status) === 'granted'
            && $this->enumValue($connection->verification_status) === 'healthy'
                ? $connection
                : null;
    }

    private function enumValue(mixed $value): string
    {
        return $value instanceof BackedEnum ? (string) $value->value : (string) $value;
    }

    private function sameScope(OperationRun $run, OperationRun $candidate): bool
    {
        return (int) $candidate->workspace_id === (int) $run->workspace_id
            && (int) ($candidate->managed_environment_id ?? 0) === (int) ($run->managed_environment_id ?? 0);
    }

    private function isLater(OperationRun $run, OperationRun $candidate): bool
    {
        $runTimestamp = $run->completed_at ?? $run->created_at;
        $candidateTimestamp = $candidate->completed_at ?? $candidate->created_at;

        if ($runTimestamp !== null && $candidateTimestamp !== null) {
            if ($candidateTimestamp->greaterThan($runTimestamp)) {
                return true;
            }

            if ($candidateTimestamp->lessThan($runTimestamp)) {
                return false;
            }
        }

        return (int) $candidate->getKey() > (int) $run->getKey();
    }

    /**
     * @return Collection<int, OperationRun>
     */
    private function laterSuccessfulRuns(): Collection
    {
        if ($this->laterSuccessfulRuns instanceof Collection) {
            return $this->laterSuccessfulRuns;
        }

        $workspaceIds = $this->runs
            ->pluck('workspace_id')
            ->filter(static fn (mixed $value): bool => is_numeric($value))
            ->map(static fn (mixed $value): int => (int) $value)
            ->unique()
            ->values()
            ->all();

        if ($workspaceIds === []) {
            return $this->laterSuccessfulRuns = collect();
        }

        $rawTypes = collect($this->registry?->canonicalTypesWithLaterSuccessPolicy() ?? [])
            ->flatMap(static fn (string $type): array => OperationCatalog::rawValuesForCanonical($type))
            ->unique()
            ->values()
            ->all();

        if ($rawTypes === []) {
            return $this->laterSuccessfulRuns = collect();
        }

        $minCreatedAt = $this->runs
            ->map(static fn (OperationRun $run): mixed => $run->created_at ?? $run->completed_at)
            ->filter()
            ->sort()
            ->first();

        $query = OperationRun::query()
            ->whereIn('workspace_id', $workspaceIds)
            ->whereIn('type', $rawTypes)
            ->where('status', OperationRunStatus::Completed->value)
            ->where('outcome', OperationRunOutcome::Succeeded->value)
            ->orderBy('completed_at')
            ->orderBy('created_at')
            ->orderBy('id');

        if ($minCreatedAt !== null) {
            $query->where(function ($query) use ($minCreatedAt): void {
                $query
                    ->whereNull('completed_at')
                    ->orWhere('completed_at', '>=', $minCreatedAt)
                    ->orWhere('created_at', '>=', $minCreatedAt);
            });
        }

        return $this->laterSuccessfulRuns = $query->get();
    }

    /**
     * @return Collection<int, ProviderConnection>
     */
    private function providerConnections(): Collection
    {
        if ($this->providerConnections instanceof Collection) {
            return $this->providerConnections;
        }

        $ids = $this->runs
            ->map(static fn (OperationRun $run): mixed => data_get($run->context, 'provider_connection_id'))
            ->filter(static fn (mixed $value): bool => is_numeric($value))
            ->map(static fn (mixed $value): int => (int) $value)
            ->unique()
            ->values()
            ->all();

        if ($ids === []) {
            return $this->providerConnections = collect();
        }

        return $this->providerConnections = ProviderConnection::query()
            ->whereIn('id', $ids)
            ->get()
            ->keyBy(static fn (ProviderConnection $connection): int => (int) $connection->getKey());
    }
}