<?php

namespace KTXC\Service;

use KTXC\Models\Identity\User;
use KTXC\SessionIdentity;
use KTXC\SessionTenant;
use KTXC\Stores\UserAccountsStore;

class UserAccountsService
{
    
    public function __construct(
        private readonly SessionTenant $tenantIdentity,
		private readonly SessionIdentity $userIdentity,
        private readonly UserAccountsStore $userStore
    ) {
    }

    // =========================================================================
    // User Operations
    // =========================================================================

    /**
     * List all users with optional filters
     */
    public function listUsers(array $filters = []): array
    {
        $users = $this->userStore->listUsers($this->tenantIdentity->identifier(), $filters);
        
        // Remove sensitive data
        foreach ($users as &$user) {
            unset($user['settings']);
        }
        
        return $users;
    }

    public function fetchByIdentity(string $identifier): User | null
    {
        $data = $this->userStore->fetchByIdentity($this->tenantIdentity->identifier(), $identifier);
        if (!$data) {
            return null;
        }

        $user = new User();
        $user->populate($data, 'users');
        return $user;
    }

    public function fetchByIdentifier(string $identifier): array | null
    {
        return $this->userStore->fetchByIdentifier($this->tenantIdentity->identifier(), $identifier);
    }

    public function fetchByIdentityRaw(string $identifier): array | null
    {
        return $this->userStore->fetchByIdentity($this->tenantIdentity->identifier(), $identifier);
    }

    public function fetchByProviderSubject(string $provider, string $subject): ?array
    {
        return $this->userStore->fetchByProviderSubject($this->tenantIdentity->identifier(), $provider, $subject);
    }

    public function createUser(array $userData): array
    {
        return $this->userStore->createUser($this->tenantIdentity->identifier(), $userData);
    }

    public function updateUser(string $uid, array $updates): bool
    {
        return $this->userStore->updateUser($this->tenantIdentity->identifier(), $uid, $updates);
    }

    public function deleteUser(string $uid): bool
    {
        return $this->userStore->deleteUser($this->tenantIdentity->identifier(), $uid);
    }

    // =========================================================================
    // Profile Operations
    // =========================================================================

    public function fetchProfile(string $uid): ?array
    {
        return $this->userStore->fetchProfile($this->tenantIdentity->identifier(), $uid);
    }

    public function storeProfile(string $uid, array $profileFields): bool
    {
        // Get managed fields to filter out read-only fields
        $user = $this->fetchByIdentifier($uid);
        if (!$user) {
            return false;
        }

        $managedFields = $user['provider_managed_fields'] ?? [];
        $editableFields = [];

        // Only include fields that are not managed by provider
        foreach ($profileFields as $field => $value) {
            if (!in_array($field, $managedFields)) {
                $editableFields[$field] = $value;
            }
        }

        if (empty($editableFields)) {
            return false;
        }

        return $this->userStore->storeProfile($this->tenantIdentity->identifier(), $uid, $editableFields);
    }

    // =========================================================================
    // Settings Operations
    // =========================================================================

    public function fetchSettings(array $settings = []): array | null
    {
        return $this->userStore->fetchSettings($this->tenantIdentity->identifier(), $this->userIdentity->identifier(), $settings);
    }

    public function storeSettings(array $settings): bool
    {
        return $this->userStore->storeSettings($this->tenantIdentity->identifier(), $this->userIdentity->identifier(), $settings);
    }

    // =========================================================================
    // Helper Methods
    // =========================================================================

    /**
     * Check if a profile field is editable by the user
     * 
     * @param string $uid User identifier
     * @param string $field Profile field name
     * @return bool True if field is editable, false if managed by provider
     */
    public function isFieldEditable(string $uid, string $field): bool
    {
        $user = $this->fetchByIdentifier($uid);
        if (!$user) {
            return false;
        }

        $managedFields = $user['provider_managed_fields'] ?? [];
        return !in_array($field, $managedFields);
    }

    /**
     * Get editable fields for a user
     * 
     * @param string $uid User identifier
     * @return array Array with field => ['value' => ..., 'editable' => bool, 'provider' => ...]
     */
    public function getEditableFields(string $uid): array
    {
        $user = $this->fetchByIdentifier($uid);
        if (!$user || !isset($user['profile'])) {
            return [];
        }

        $managedFields = $user['provider_managed_fields'] ?? [];
        $provider = $user['provider'] ?? null;
        $editable = [];

        foreach ($user['profile'] as $field => $value) {
            $editable[$field] = [
                'value' => $value,
                'editable' => !in_array($field, $managedFields),
                'provider' => in_array($field, $managedFields) ? $provider : null,
            ];
        }

        return $editable;
    }

}