<?php

namespace MintyPHP\Repository;

use MintyPHP\DB;

class DepartmentRepository
{
    private static function unwrap(?array $row): ?array
    {
        if (!$row) {
            return null;
        }
        return $row['departments'] ?? null;
    }

    private static function unwrapList($rows): array
    {
        if (!is_array($rows)) {
            return [];
        }
        $list = [];
        foreach ($rows as $row) {
            $department = $row['departments'] ?? null;
            if (is_array($department)) {
                $list[] = $department;
            }
        }
        return $list;
    }

    public static function list(): array
    {
        $rows = DB::select(
            'select id, uuid, description, created_by, modified_by, created, modified from departments order by id desc'
        );
        return self::unwrapList($rows);
    }

    public static function listIds(): array
    {
        $rows = DB::select('select id from departments');
        if (!is_array($rows)) {
            return [];
        }
        $ids = [];
        foreach ($rows as $row) {
            $data = $row['departments'] ?? $row;
            if (is_array($data) && isset($data['id'])) {
                $ids[] = (int) $data['id'];
            }
        }
        return array_values(array_unique($ids));
    }

    public static function listByTenantIds(array $tenantIds): array
    {
        $tenantIds = array_values(array_unique(array_map('intval', $tenantIds)));
        $tenantIds = array_filter($tenantIds, static fn ($id) => $id > 0);
        if (!$tenantIds) {
            return [];
        }
        $placeholders = implode(',', array_fill(0, count($tenantIds), '?'));
        $rows = DB::select(
            'select departments.id, departments.uuid, departments.description, departments.created_by, departments.modified_by, departments.created, departments.modified ' .
            'from departments departments join tenant_departments td on td.department_id = departments.id ' .
            'where td.tenant_id in (' . $placeholders . ') ' .
            'group by departments.id, departments.uuid, departments.description, departments.created_by, departments.modified_by, departments.created, departments.modified ' .
            'order by departments.description asc',
            ...array_map('strval', $tenantIds)
        );
        return self::unwrapList($rows);
    }

    public static function listByIds(array $departmentIds): array
    {
        $departmentIds = array_values(array_unique(array_map('intval', $departmentIds)));
        $departmentIds = array_filter($departmentIds, static fn ($id) => $id > 0);
        if (!$departmentIds) {
            return [];
        }
        $placeholders = implode(',', array_fill(0, count($departmentIds), '?'));
        $rows = DB::select(
            'select id, uuid, description, created_by, modified_by, created, modified from departments where id in (' . $placeholders . ') order by description asc',
            ...array_map('strval', $departmentIds)
        );
        return self::unwrapList($rows);
    }

    public static function listPaged(array $options): array
    {
        $limit = (int) ($options['limit'] ?? 10);
        if ($limit < 1) {
            $limit = 10;
        } elseif ($limit > 100) {
            $limit = 100;
        }

        $offset = (int) ($options['offset'] ?? 0);
        if ($offset < 0) {
            $offset = 0;
        }

        $search = trim((string) ($options['search'] ?? ''));
        $tenant = trim((string) ($options['tenant'] ?? ''));
        $order = (string) ($options['order'] ?? 'id');
        $dir = strtolower((string) ($options['dir'] ?? 'desc'));
        $allowedOrder = ['id', 'uuid', 'description', 'created', 'modified'];
        if (!in_array($order, $allowedOrder, true)) {
            $order = 'id';
        }
        if (!in_array($dir, ['asc', 'desc'], true)) {
            $dir = 'desc';
        }

        $where = [];
        $params = [];
        if ($search !== '') {
            $like = '%' . $search . '%';
            $where[] = '(description like ? or uuid like ?)';
            $params[] = $like;
            $params[] = $like;
        }
        if ($tenant !== '') {
            $where[] = "exists (select 1 from tenant_departments td join tenants t on t.id = td.tenant_id and t.status = 'active' where td.department_id = departments.id and t.uuid = ?)";
            $params[] = $tenant;
        }
        if (!empty($options['tenantUserId'])) {
            $tenantUserId = (int) $options['tenantUserId'];
            if ($tenantUserId > 0) {
                if (defined('TENANT_SCOPE_STRICT') && TENANT_SCOPE_STRICT) {
                    $where[] = 'exists (select 1 from tenant_departments td ' .
                        "join tenants t on t.id = td.tenant_id and t.status = 'active' " .
                        'join user_tenants ut on ut.tenant_id = td.tenant_id ' .
                        'where ut.user_id = ? and td.department_id = departments.id)';
                    $params[] = (string) $tenantUserId;
                } else {
                    $where[] = '(not exists (select 1 from tenant_departments td where td.department_id = departments.id) ' .
                        'or exists (select 1 from tenant_departments td ' .
                        "join tenants t on t.id = td.tenant_id and t.status = 'active' " .
                        'join user_tenants ut on ut.tenant_id = td.tenant_id ' .
                        'where ut.user_id = ? and td.department_id = departments.id))';
                    $params[] = (string) $tenantUserId;
                }
            }
        } elseif (array_key_exists('tenantIds', $options)) {
            $tenantIds = $options['tenantIds'];
            $tenantIds = is_array($tenantIds) ? array_values(array_unique(array_map('intval', $tenantIds))) : [];
            if ($tenantIds) {
                if (defined('TENANT_SCOPE_STRICT') && TENANT_SCOPE_STRICT) {
                    $where[] = 'exists (select 1 from tenant_departments td where td.department_id = departments.id and td.tenant_id in (???))';
                    $params[] = $tenantIds;
                } else {
                    $where[] = '(not exists (select 1 from tenant_departments td where td.department_id = departments.id) ' .
                        'or exists (select 1 from tenant_departments td where td.department_id = departments.id and td.tenant_id in (???)))';
                    $params[] = $tenantIds;
                }
            } else {
                if (defined('TENANT_SCOPE_STRICT') && TENANT_SCOPE_STRICT) {
                    $where[] = '1=0';
                } else {
                    $where[] = 'not exists (select 1 from tenant_departments td where td.department_id = departments.id)';
                }
            }
        }

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

        $query = 'select id, uuid, description, created_by, modified_by, created, modified from departments' .
            $whereSql .
            sprintf(' order by `%s` %s limit ? offset ?', $order, $dir);

        $queryParams = array_merge($params, [(string) $limit, (string) $offset]);
        $rows = call_user_func_array(['MintyPHP\\DB', 'select'], array_merge([$query], $queryParams));

        $list = self::unwrapList($rows);
        $ids = [];
        foreach ($list as $department) {
            if (isset($department['id'])) {
                $ids[] = (int) $department['id'];
            }
        }
        $tenantLabelsByDepartment = [];
        if ($ids) {
            $placeholders = implode(',', array_fill(0, count($ids), '?'));
            $labelRows = DB::select(
                "select td.department_id as department_id, t.description as description from tenant_departments td join tenants t on t.id = td.tenant_id and t.status = 'active' " .
                'where td.department_id in (' . $placeholders . ') order by t.description asc',
                ...array_map('strval', $ids)
            );
            $collectLabels = static function (array $rows): array {
                $labelsByDepartment = [];
                foreach ($rows as $row) {
                    $departmentId = 0;
                    $label = '';
                    if (isset($row['td']) && is_array($row['td'])) {
                        $departmentId = (int) ($row['td']['department_id'] ?? 0);
                    }
                    if (isset($row['t']) && is_array($row['t'])) {
                        $label = (string) ($row['t']['description'] ?? '');
                    }
                    if ($departmentId === 0 || $label === '') {
                        foreach ($row as $value) {
                            if (!is_array($value)) {
                                continue;
                            }
                            if ($departmentId === 0 && isset($value['department_id'])) {
                                $departmentId = (int) $value['department_id'];
                            }
                            if ($label === '' && isset($value['description'])) {
                                $label = (string) $value['description'];
                            }
                        }
                    }
                    if ($departmentId === 0 && isset($row['department_id'])) {
                        $departmentId = (int) $row['department_id'];
                    }
                    if ($label === '' && isset($row['description'])) {
                        $label = (string) $row['description'];
                    }
                    if ($departmentId > 0 && $label !== '') {
                        $labelsByDepartment[$departmentId] ??= [];
                        $labelsByDepartment[$departmentId][] = $label;
                    }
                }
                return $labelsByDepartment;
            };
            $tenantLabelsByDepartment = $collectLabels($labelRows);
        }
        foreach ($list as &$department) {
            $departmentId = (int) ($department['id'] ?? 0);
            $department['tenant_labels'] = $tenantLabelsByDepartment[$departmentId] ?? [];
        }
        unset($department);

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

    public static function find(int $id): ?array
    {
        $row = DB::selectOne(
            'select id, uuid, description, created_by, modified_by, created, modified from departments where id = ? limit 1',
            (string) $id
        );
        return self::unwrap($row);
    }

    public static function findByUuid(string $uuid): ?array
    {
        $row = DB::selectOne(
            'select id, uuid, description, created_by, modified_by, created, modified from departments where uuid = ? limit 1',
            $uuid
        );
        return self::unwrap($row);
    }

    private static function uuidV4(): string
    {
        $data = random_bytes(16);
        $data[6] = chr((ord($data[6]) & 0x0f) | 0x40);
        $data[8] = chr((ord($data[8]) & 0x3f) | 0x80);
        return vsprintf('%s%s-%s-%s-%s-%s%s%s', str_split(bin2hex($data), 4));
    }

    public static function create(array $data)
    {
        return DB::insert(
            'insert into departments (uuid, description, created_by, created) values (?,?,?,NOW())',
            $data['uuid'] ?? self::uuidV4(),
            $data['description'],
            $data['created_by'] ?? null
        );
    }

    public static function update(int $id, array $data): bool
    {
        $fields = [
            'description' => $data['description'],
        ];
        if (array_key_exists('modified_by', $data)) {
            $fields['modified_by'] = $data['modified_by'];
        }

        $setParts = [];
        $params = [];
        foreach ($fields as $field => $value) {
            $setParts[] = sprintf('`%s` = ?', $field);
            $params[] = $value;
        }
        $params[] = (string) $id;

        $query = 'update departments set ' . implode(', ', $setParts) . ' where id = ?';
        $result = DB::update($query, ...$params);
        return $result !== false;
    }

    public static function delete(int $id): bool
    {
        $result = DB::delete('delete from departments where id = ?', (string) $id);
        return $result !== false;
    }
}