<?php

namespace MintyPHP\Repository\User;

use MintyPHP\DB;
use MintyPHP\Repository\Support\RepoQuery;

/** Builds and executes complex user list queries with search, date, role, department, and custom field filters. */
class UserListQueryRepository implements UserListQueryRepositoryInterface
{
    private function buildUserFilters(array $options): array
    {
        $search = trim((string) ($options['search'] ?? ''));
        $active = $options['active'] ?? null;
        $createdFrom = trim((string) ($options['created_from'] ?? ''));
        $createdTo = trim((string) ($options['created_to'] ?? ''));
        $tenant = trim((string) ($options['tenant'] ?? ''));
        $tenantUuids = RepoQuery::normalizeStringList($options['tenants'] ?? []);
        $roleIds = RepoQuery::normalizeIdList($options['roles'] ?? []);
        $departmentIds = RepoQuery::normalizeIdList($options['departments'] ?? []);
        $emailVerified = $options['email_verified'] ?? null;
        $loginStatus = $options['login_status'] ?? null;
        $customFieldFilterSpec = is_array($options['customFieldFilterSpec'] ?? null)
            ? $options['customFieldFilterSpec']
            : [];
        $customFieldFilters = is_array($customFieldFilterSpec['filters'] ?? null)
            ? $customFieldFilterSpec['filters']
            : [];

        $where = [];
        $params = [];

        RepoQuery::addLikeFilter(
            $where,
            $params,
            ['users.first_name', 'users.last_name', 'users.email'],
            $search
        );
        RepoQuery::addEnumFilter($where, $params, $active, [
            ['aliases' => ['1', 'true', 'active'], 'sql' => 'users.active = ?', 'params' => ['1']],
            ['aliases' => ['0', 'false', 'inactive'], 'sql' => 'users.active = ?', 'params' => ['0']],
        ]);

        if ($createdFrom !== '' && preg_match('/^\d{4}-\d{2}-\d{2}$/', $createdFrom)) {
            $where[] = 'users.created >= ?';
            $params[] = $createdFrom . ' 00:00:00';
        }
        if ($createdTo !== '' && preg_match('/^\d{4}-\d{2}-\d{2}$/', $createdTo)) {
            $where[] = 'users.created <= ?';
            $params[] = $createdTo . ' 23:59:59';
        }
        if ($tenantUuids) {
            $where[] = 'exists (select 1 from user_tenants ut2 join tenants t2 on t2.id = ut2.tenant_id where ut2.user_id = users.id and t2.uuid in (???))';
            $params[] = array_values($tenantUuids);
        } else {
            RepoQuery::addEqualsFilter(
                $where,
                $params,
                $tenant,
                'exists (select 1 from user_tenants ut2 join tenants t2 on t2.id = ut2.tenant_id where ut2.user_id = users.id and t2.uuid = ?)'
            );
        }
        if ($roleIds) {
            $where[] = 'exists (select 1 from user_roles ur2 where ur2.user_id = users.id and ur2.role_id in (???))';
            $params[] = array_map('strval', $roleIds);
        }
        if ($departmentIds) {
            $where[] = 'exists (select 1 from user_departments ud2 where ud2.user_id = users.id and ud2.department_id in (???))';
            $params[] = array_map('strval', $departmentIds);
        }
        RepoQuery::addEnumFilter($where, $params, $emailVerified, [
            ['aliases' => ['1', 'true', 'verified', 'yes'], 'sql' => 'users.email_verified_at is not null'],
            ['aliases' => ['0', 'false', 'unverified', 'no'], 'sql' => 'users.email_verified_at is null'],
        ]);
        RepoQuery::addEnumFilter($where, $params, $loginStatus, [
            ['aliases' => ['never', 'none', 'no'], 'sql' => 'users.last_login_at is null'],
            ['aliases' => ['ever', 'logged', 'yes'], 'sql' => 'users.last_login_at is not null'],
        ]);
        if (!empty($customFieldFilters['select']) && is_array($customFieldFilters['select'])) {
            foreach ($customFieldFilters['select'] as $definitionId => $optionId) {
                $definitionId = (int) $definitionId;
                $optionId = (int) $optionId;
                if ($definitionId <= 0 || $optionId <= 0) {
                    continue;
                }
                $where[] = 'exists (select 1 from user_custom_field_values ucfv ' .
                    'where ucfv.user_id = users.id and ucfv.definition_id = ? and ucfv.option_id = ?)';
                $params[] = (string) $definitionId;
                $params[] = (string) $optionId;
            }
        }
        if (!empty($customFieldFilters['boolean']) && is_array($customFieldFilters['boolean'])) {
            foreach ($customFieldFilters['boolean'] as $definitionId => $boolValue) {
                $definitionId = (int) $definitionId;
                $boolValue = (int) $boolValue;
                if ($definitionId <= 0 || ($boolValue !== 0 && $boolValue !== 1)) {
                    continue;
                }
                $where[] = 'exists (select 1 from user_custom_field_values ucfv ' .
                    'where ucfv.user_id = users.id and ucfv.definition_id = ? and ucfv.value_bool = ?)';
                $params[] = (string) $definitionId;
                $params[] = (string) $boolValue;
            }
        }
        if (!empty($customFieldFilters['multiselect']) && is_array($customFieldFilters['multiselect'])) {
            foreach ($customFieldFilters['multiselect'] as $definitionId => $optionIds) {
                $definitionId = (int) $definitionId;
                $optionIds = RepoQuery::normalizeIdList($optionIds);
                if ($definitionId <= 0 || !$optionIds) {
                    continue;
                }
                $where[] = 'exists (select 1 from user_custom_field_values ucfv ' .
                    'join user_custom_field_value_options ucfvo on ucfvo.value_id = ucfv.id ' .
                    'where ucfv.user_id = users.id and ucfv.definition_id = ? and ucfvo.option_id in (???))';
                $params[] = (string) $definitionId;
                $params[] = array_map('strval', $optionIds);
            }
        }
        if (!empty($customFieldFilters['date']) && is_array($customFieldFilters['date'])) {
            foreach ($customFieldFilters['date'] as $definitionId => $bounds) {
                $definitionId = (int) $definitionId;
                $from = is_array($bounds) ? trim((string) ($bounds['from'] ?? '')) : '';
                $to = is_array($bounds) ? trim((string) ($bounds['to'] ?? '')) : '';
                if ($definitionId <= 0 || ($from === '' && $to === '')) {
                    continue;
                }
                if ($from !== '') {
                    $where[] = 'exists (select 1 from user_custom_field_values ucfv ' .
                        'where ucfv.user_id = users.id and ucfv.definition_id = ? and ucfv.value_date >= ?)';
                    $params[] = (string) $definitionId;
                    $params[] = $from;
                }
                if ($to !== '') {
                    $where[] = 'exists (select 1 from user_custom_field_values ucfv ' .
                        'where ucfv.user_id = users.id and ucfv.definition_id = ? and ucfv.value_date <= ?)';
                    $params[] = (string) $definitionId;
                    $params[] = $to;
                }
            }
        }
        if (!empty($options['tenantUserId'])) {
            $tenantUserId = (int) $options['tenantUserId'];
            if ($tenantUserId > 0) {
                if (defined('TENANT_SCOPE_STRICT') && TENANT_SCOPE_STRICT) {
                    $where[] = 'exists (select 1 from user_tenants ut join user_tenants ut2 on ut2.tenant_id = ut.tenant_id ' .
                        "join tenants t on t.id = ut.tenant_id and t.status = 'active' " .
                        'where ut2.user_id = ? and ut.user_id = users.id)';
                    $params[] = (string) $tenantUserId;
                } else {
                    $where[] = '(not exists (select 1 from user_tenants ut where ut.user_id = users.id) ' .
                        'or exists (select 1 from user_tenants ut join user_tenants ut2 on ut2.tenant_id = ut.tenant_id ' .
                        "join tenants t on t.id = ut.tenant_id and t.status = 'active' " .
                        'where ut2.user_id = ? and ut.user_id = users.id))';
                    $params[] = (string) $tenantUserId;
                }
            }
        }

        $whereSql = $where ? (' where ' . implode(' and ', $where)) : '';
        return [$whereSql, $params];
    }

    private function buildListQuery(string $whereSql, string $order, string $dir): string
    {
        return 'select users.id, users.uuid, users.first_name, users.last_name, users.display_name, users.email, users.profile_description, users.job_title, users.phone, users.mobile, users.short_dial, users.address, users.postal_code, users.city, users.country, users.region, users.hire_date, users.theme, users.primary_tenant_id, users.created_by, users.modified_by, users.created, users.modified, users.last_login_at, users.last_login_provider, users.active, ' .
            'pt.description as primary_tenant_label ' .
            "from users left join tenants pt on pt.id = users.primary_tenant_id and pt.status = 'active'" .
            $whereSql .
            sprintf(' order by `users`.`%s` %s limit ? offset ?', $order, $dir);
    }

    private function extractIds(array $list): array
    {
        $ids = [];
        foreach ($list as $user) {
            if (isset($user['id'])) {
                $ids[] = (int) $user['id'];
            }
        }
        return $ids;
    }

    private function collectLabels(array $rows, string $userKey, string $labelKey): array
    {
        $labelsByUser = [];
        foreach ($rows as $row) {
            $userId = 0;
            $label = '';
            if (isset($row[$userKey]) && is_array($row[$userKey])) {
                $userId = (int) ($row[$userKey]['user_id'] ?? 0);
            }
            if (isset($row[$labelKey]) && is_array($row[$labelKey])) {
                $label = (string) ($row[$labelKey]['description'] ?? '');
            }
            if ($userId === 0 || $label === '') {
                foreach ($row as $value) {
                    if (!is_array($value)) {
                        continue;
                    }
                    if ($userId === 0 && isset($value['user_id'])) {
                        $userId = (int) $value['user_id'];
                    }
                    if ($label === '' && isset($value['description'])) {
                        $label = (string) $value['description'];
                    }
                }
            }
            if ($userId === 0 && isset($row['user_id'])) {
                $userId = (int) $row['user_id'];
            }
            if ($label === '' && isset($row['description'])) {
                $label = (string) $row['description'];
            }
            if ($userId > 0 && $label !== '') {
                $labelsByUser[$userId] ??= [];
                $labelsByUser[$userId][] = $label;
            }
        }
        return $labelsByUser;
    }

    private function hydrateUserLabels(array $list, array $options): array
    {
        $ids = $this->extractIds($list);
        if (!$ids) {
            return $list;
        }

        $scopeUserId = (int) ($options['tenantUserId'] ?? 0);
        $scopeToActiveTenants = $scopeUserId > 0;
        $tenantLabelJoin = $scopeToActiveTenants
            ? "join tenants t on t.id = ut.tenant_id and t.status = 'active' "
            : 'join tenants t on t.id = ut.tenant_id ';
        $placeholders = implode(',', array_fill(0, count($ids), '?'));
        $tenantScopeSql = '';
        $tenantScopeParams = [];
        if ($scopeToActiveTenants) {
            $tenantScopeSql = ' and exists (select 1 from user_tenants uts ' .
                "join tenants ts on ts.id = uts.tenant_id and ts.status = 'active' " .
                'where uts.user_id = ? and uts.tenant_id = ut.tenant_id)';
            $tenantScopeParams[] = (string) $scopeUserId;
        }

        $labelSql = 'select ut.user_id as user_id, t.id as tenant_id, t.description as description from user_tenants ut ' . $tenantLabelJoin .
            'where ut.user_id in (' . $placeholders . ')' . $tenantScopeSql . ' order by t.description asc';
        $labelRows = call_user_func_array(['MintyPHP\\DB', 'select'], array_merge(
            [$labelSql],
            array_merge(array_map('strval', $ids), $tenantScopeParams)
        ));
        $roleRows = DB::select(
            'select ur.user_id as user_id, r.description as description from user_roles ur join roles r on r.id = ur.role_id and r.active = 1 ' .
            'where ur.user_id in (' . $placeholders . ') order by r.description asc',
            ...array_map('strval', $ids)
        );

        $departmentScopeSql = '';
        $departmentScopeParams = [];
        if ($scopeToActiveTenants) {
            $departmentScopeSql = ' and exists (select 1 from user_tenants uts ' .
                "join tenants ts on ts.id = uts.tenant_id and ts.status = 'active' " .
                'where uts.user_id = ? and uts.tenant_id = d.tenant_id)';
            $departmentScopeParams[] = (string) $scopeUserId;
        }
        $departmentLabelSql = 'select ud.user_id as user_id, d.description as description from user_departments ud ' .
            'join departments d on d.id = ud.department_id and d.active = 1 ' .
            'where ud.user_id in (' . $placeholders . ')' . $departmentScopeSql . ' order by d.description asc';
        $departmentRows = call_user_func_array(['MintyPHP\\DB', 'select'], array_merge(
            [$departmentLabelSql],
            array_merge(array_map('strval', $ids), $departmentScopeParams)
        ));

        $tenantMapByUser = [];
        foreach ($labelRows as $row) {
            $userId = 0;
            $tenantId = 0;
            $label = '';
            if (isset($row['ut']) && is_array($row['ut'])) {
                $userId = (int) ($row['ut']['user_id'] ?? 0);
            }
            if (isset($row['t']) && is_array($row['t'])) {
                $tenantId = (int) ($row['t']['tenant_id'] ?? 0);
                $label = (string) ($row['t']['description'] ?? '');
            }
            if ($userId === 0 || $tenantId === 0 || $label === '') {
                foreach ($row as $value) {
                    if (!is_array($value)) {
                        continue;
                    }
                    if ($userId === 0 && isset($value['user_id'])) {
                        $userId = (int) $value['user_id'];
                    }
                    if ($tenantId === 0 && isset($value['tenant_id'])) {
                        $tenantId = (int) $value['tenant_id'];
                    }
                    if ($label === '' && isset($value['description'])) {
                        $label = (string) $value['description'];
                    }
                }
            }
            if ($userId === 0 && isset($row['user_id'])) {
                $userId = (int) $row['user_id'];
            }
            if ($tenantId === 0 && isset($row['tenant_id'])) {
                $tenantId = (int) $row['tenant_id'];
            }
            if ($label === '' && isset($row['description'])) {
                $label = (string) $row['description'];
            }
            if ($userId > 0 && $tenantId > 0 && $label !== '') {
                $tenantMapByUser[$userId] ??= [];
                $tenantMapByUser[$userId][$tenantId] = $label;
            }
        }
        $tenantLabelsByUser = [];
        foreach ($tenantMapByUser as $userId => $map) {
            $tenantLabelsByUser[$userId] = array_values($map);
        }
        $roleLabelsByUser = $this->collectLabels($roleRows, 'ur', 'r');
        $departmentLabelsByUser = $this->collectLabels($departmentRows, 'ud', 'd');

        foreach ($list as &$user) {
            $userId = (int) ($user['id'] ?? 0);
            $primaryId = (int) ($user['primary_tenant_id'] ?? 0);
            $user['tenant_labels'] = $tenantLabelsByUser[$userId] ?? [];
            if ($primaryId > 0 && isset($tenantMapByUser[$userId][$primaryId])) {
                $user['primary_tenant_label'] = $tenantMapByUser[$userId][$primaryId];
            }
            $user['role_labels'] = $roleLabelsByUser[$userId] ?? [];
            $user['department_labels'] = $departmentLabelsByUser[$userId] ?? [];
        }
        unset($user);

        return $list;
    }

    private function unwrapList($rows): array
    {
        if (!is_array($rows)) {
            return [];
        }
        $list = [];
        foreach ($rows as $row) {
            $user = $row['users'] ?? null;
            if (is_array($user)) {
                foreach ($row as $key => $value) {
                    if ($key === 'users' || is_array($value)) {
                        continue;
                    }
                    $user[$key] = $value;
                }
                if (isset($row['pt']) && is_array($row['pt'])) {
                    $label = (string) ($row['pt']['description'] ?? '');
                    if ($label !== '') {
                        $user['primary_tenant_label'] = $label;
                    }
                }
                $list[] = $user;
            }
        }
        return $list;
    }

    public function listPaged(array $options): array
    {
        $allowedOrder = ['id', 'uuid', 'first_name', 'last_name', 'display_name', 'email', 'created', 'modified', 'active', 'last_login_at'];
        [$limit, $offset] = RepoQuery::sanitizeLimitOffset($options);
        [$order, $dir] = RepoQuery::sanitizeOrder($options, $allowedOrder);
        [$whereSql, $params] = $this->buildUserFilters($options);

        $count = DB::selectValue('select count(*) from users' . $whereSql, ...$params);
        $total = $count ? (int) $count : 0;

        $query = $this->buildListQuery($whereSql, $order, $dir);
        $queryParams = array_merge($params, [(string) $limit, (string) $offset]);
        $rows = call_user_func_array(['MintyPHP\\DB', 'select'], array_merge([$query], $queryParams));

        $list = $this->unwrapList($rows);
        $list = $this->hydrateUserLabels($list, $options);

        return [
            'total' => $total,
            'rows' => $list,
        ];
    }
}