<?php

declare(strict_types=1);

namespace App\Services\TenantConfiguration;

final class ExchangeTeamsRenderableSummaryBuilder
{
    public function __construct(
        private readonly ExchangeTeamsComparablePayloadNormalizer $normalizer,
    ) {}

    public function supports(string $canonicalType): bool
    {
        return $this->normalizer->supports($canonicalType);
    }

    /**
     * @param  array<string, mixed>  $payload
     */
    public function canBuild(string $canonicalType, array $payload): bool
    {
        if (! $this->supports($canonicalType)) {
            return false;
        }

        $normalized = $this->normalizer->normalize($canonicalType, $payload);

        return ($normalized['supported'] ?? false) === true;
    }

    /**
     * @param  array<string, mixed>  $payload
     * @param  array<string, mixed>  $context
     * @return array<string, mixed>|null
     */
    public function build(string $canonicalType, array $payload, array $context = []): ?array
    {
        if (! $this->supports($canonicalType)) {
            return null;
        }

        $normalized = $this->normalizer->normalize($canonicalType, $payload);

        if (($normalized['supported'] ?? false) !== true) {
            return null;
        }

        return match ($canonicalType) {
            'transportRule' => $this->transportRuleSummary($normalized, $context),
            'acceptedDomain' => $this->acceptedDomainSummary($normalized, $context),
            'appPermissionPolicy' => $this->appPermissionPolicySummary($normalized, $context),
            'meetingPolicy' => $this->meetingPolicySummary($normalized, $context),
            default => null,
        };
    }

    /**
     * @param  array<string, mixed>  $normalized
     * @param  array<string, mixed>  $context
     * @return array<string, mixed>
     */
    private function transportRuleSummary(array $normalized, array $context): array
    {
        return $this->baseSummary('Transport rule', $normalized, $context, [
            ['label' => 'Display name', 'value' => $normalized['display_name'] ?? 'Unnamed transport rule'],
            ['label' => 'Enabled/state', 'value' => $normalized['enabled_state'] ?? null],
            ['label' => 'Priority / order', 'value' => $normalized['priority_order'] ?? null],
            ['label' => 'Mode / enforcement', 'value' => $normalized['mode'] ?? null],
            ['label' => 'Conditions', 'value' => $this->settingSummary($normalized['conditions'] ?? [])],
            ['label' => 'Actions', 'value' => $this->settingSummary($normalized['actions'] ?? [])],
            ['label' => 'Exceptions', 'value' => $this->settingSummary($normalized['exceptions'] ?? [])],
        ]);
    }

    /**
     * @param  array<string, mixed>  $normalized
     * @param  array<string, mixed>  $context
     * @return array<string, mixed>
     */
    private function acceptedDomainSummary(array $normalized, array $context): array
    {
        return $this->baseSummary('Accepted domain', $normalized, $context, [
            ['label' => 'Domain name', 'value' => $normalized['domain_name'] ?? 'Unnamed accepted domain'],
            ['label' => 'Domain type', 'value' => $normalized['domain_type'] ?? null],
            ['label' => 'Default domain', 'value' => $normalized['is_default'] ?? null],
            ['label' => 'State', 'value' => $normalized['state'] ?? null],
        ], displayName: $normalized['domain_name'] ?? null, state: $normalized['state'] ?? null);
    }

    /**
     * @param  array<string, mixed>  $normalized
     * @param  array<string, mixed>  $context
     * @return array<string, mixed>
     */
    private function appPermissionPolicySummary(array $normalized, array $context): array
    {
        return $this->baseSummary('Teams app permission policy', $normalized, $context, [
            ['label' => 'Display name', 'value' => $normalized['display_name'] ?? 'Unnamed app permission policy'],
            ['label' => 'Policy mode', 'value' => $normalized['policy_mode'] ?? null],
            ['label' => 'Allowed apps', 'value' => $this->appSummary($normalized['allowed_apps'] ?? [])],
            ['label' => 'Blocked apps', 'value' => $this->appSummary($normalized['blocked_apps'] ?? [])],
            ['label' => 'Assignments / targets', 'value' => $this->settingSummary($normalized['targets'] ?? [])],
        ], state: $normalized['policy_mode'] ?? null);
    }

    /**
     * @param  array<string, mixed>  $normalized
     * @param  array<string, mixed>  $context
     * @return array<string, mixed>
     */
    private function meetingPolicySummary(array $normalized, array $context): array
    {
        return $this->baseSummary('Teams meeting policy', $normalized, $context, [
            ['label' => 'Display name', 'value' => $normalized['display_name'] ?? 'Unnamed meeting policy'],
            ['label' => 'State', 'value' => $normalized['state'] ?? null],
            ['label' => 'External / anonymous access', 'value' => $this->settingSummary($normalized['external_access'] ?? [])],
            ['label' => 'Recording / transcription', 'value' => $this->settingSummary($normalized['recording_transcription'] ?? [])],
            ['label' => 'Lobby / admission', 'value' => $this->settingSummary($normalized['lobby_admission'] ?? [])],
            ['label' => 'Content sharing', 'value' => $this->settingSummary($normalized['content_sharing'] ?? [])],
        ], state: $normalized['state'] ?? null);
    }

    /**
     * @param  array<string, mixed>  $normalized
     * @param  array<string, mixed>  $context
     * @param  list<array{label: string, value: mixed}>  $fields
     * @return array<string, mixed>
     */
    private function baseSummary(
        string $resourceType,
        array $normalized,
        array $context,
        array $fields,
        ?string $displayName = null,
        ?string $state = null,
    ): array {
        return [
            'resource_type' => $resourceType,
            'display_name' => $displayName ?? $this->displayName($normalized, $resourceType),
            'state' => $state,
            'summary_fields' => array_values(array_filter(
                array_map(fn (array $field): array => [
                    'label' => $field['label'],
                    'value' => $this->summaryValue($field['value']),
                ], $fields),
                static fn (array $field): bool => filled($field['value'] ?? null),
            )),
            'targets' => [],
            'conditions' => [],
            'claim_state' => $this->stringContext($context, 'claim_state'),
            'identity_state' => $this->stringContext($context, 'identity_state'),
            'last_captured' => $this->stringContext($context, 'last_captured'),
            'unsupported_fields' => data_get($normalized, 'diagnostics.unsupported_fields', []),
            'redacted_fields' => data_get($normalized, 'diagnostics.redacted_fields', []),
        ];
    }

    /**
     * @param  array<string, mixed>  $normalized
     */
    private function displayName(array $normalized, string $fallback): string
    {
        foreach (['display_name', 'domain_name'] as $key) {
            $value = $normalized[$key] ?? null;

            if (is_scalar($value) && trim((string) $value) !== '') {
                return trim((string) $value);
            }
        }

        return 'Unnamed '.$fallback;
    }

    private function summaryValue(mixed $value): ?string
    {
        if ($value === null || $value === '' || $value === []) {
            return null;
        }

        if (is_bool($value)) {
            return $value ? 'yes' : 'no';
        }

        if (is_scalar($value)) {
            $value = trim((string) $value);

            return $value !== '' ? $value : null;
        }

        if (is_array($value)) {
            return $this->stringify($value);
        }

        return null;
    }

    /**
     * @param  array<string, mixed>  $settings
     */
    private function settingSummary(array $settings): ?string
    {
        if ($settings === []) {
            return null;
        }

        $parts = [];

        foreach ($settings as $key => $value) {
            if ($this->containsRedacted($value)) {
                continue;
            }

            $value = $this->summaryValue($value);

            if ($value === null) {
                continue;
            }

            $parts[] = str((string) $key)->replace('_', ' ')->headline()->toString().': '.$value;
        }

        return $parts === [] ? null : implode('; ', $parts);
    }

    private function containsRedacted(mixed $value): bool
    {
        if ($value === '[redacted]') {
            return true;
        }

        if (! is_array($value)) {
            return false;
        }

        foreach ($value as $nestedValue) {
            if ($this->containsRedacted($nestedValue)) {
                return true;
            }
        }

        return false;
    }

    /**
     * @param  list<array<string, mixed>>  $apps
     */
    private function appSummary(array $apps): ?string
    {
        if ($apps === []) {
            return null;
        }

        $parts = [];

        foreach ($apps as $app) {
            if (! is_array($app)) {
                continue;
            }

            $display = $this->summaryValue($app['display_name'] ?? null);

            if ($display !== null) {
                $parts[] = $display;
            }
        }

        $parts = array_values(array_filter($parts));

        return $parts === [] ? null : implode(', ', $parts);
    }

    private function stringify(mixed $value): string
    {
        if (is_bool($value)) {
            return $value ? 'yes' : 'no';
        }

        if (is_scalar($value)) {
            return (string) $value;
        }

        return json_encode($value, JSON_UNESCAPED_SLASHES | JSON_UNESCAPED_UNICODE | JSON_THROW_ON_ERROR);
    }

    /**
     * @param  array<string, mixed>  $context
     */
    private function stringContext(array $context, string $key): ?string
    {
        $value = $context[$key] ?? null;

        if ($value instanceof \BackedEnum) {
            return (string) $value->value;
        }

        if (! is_scalar($value)) {
            return null;
        }

        $value = trim((string) $value);

        return $value !== '' ? $value : null;
    }
}