import type {CloudProvider, FieldSchema, ServiceSchema, TableColumnSchema} from './types'

/** CreateAutoScalingGroup's name rule: 1 to 255 characters, no colon. */
export const AUTO_SCALING_GROUP_NAME_PATTERN = '^[^:]{1,255}$'
/** A capacity the console accepts; AWS's own ceiling is far above what a laptop can run. */
export const AUTO_SCALING_MAX_INSTANCES = 20

const groupColumns: TableColumnSchema[] = [
    {name: 'name', label: 'Name'},
    {name: 'capacity', label: 'Instances', path: 'metadata.capacity'},
    {name: 'desired', label: 'Desired', path: 'metadata.desiredCapacity'},
    {name: 'min', label: 'Min', path: 'metadata.minSize'},
    {name: 'max', label: 'Max', path: 'metadata.maxSize'},
    {name: 'launchTemplate', label: 'Launch template', path: 'metadata.launchTemplateName', emptyText: '—'},
    {name: 'createdAt', label: 'Created', format: 'datetime'},
]

const groupFilters: FieldSchema[] = [{name: 'search', label: 'Search', type: 'text', required: false}]

const capacity = {pattern: '^\\d{1,2}$', message: `Use a whole number from 0 to ${AUTO_SCALING_MAX_INSTANCES}`}

export function awsAutoScalingSchema(): ServiceSchema {
    return {
        cloud: 'aws',
        service: 'autoscaling',
        displayName: 'EC2 Auto Scaling groups',
        fields: [
            {
                name: 'name',
                label: 'Name',
                type: 'text',
                required: true,
                validation: {pattern: AUTO_SCALING_GROUP_NAME_PATTERN, message: 'Use up to 255 characters, without a colon'},
            },
            {
                name: 'launchTemplate',
                label: 'Launch template',
                type: 'text',
                required: true,
                description: 'The name or ID (lt-…) of an EC2 launch template. New instances use its image and instance type.',
            },
            {
                name: 'launchTemplateVersion',
                label: 'Template version',
                type: 'text',
                required: false,
                defaultValue: '$Latest',
                description: 'A version number, $Latest or $Default.',
                validation: {pattern: '^(\\d+|\\$Latest|\\$Default)$', message: 'Use a version number, $Latest or $Default'},
            },
            {name: 'minSize', label: 'Minimum', type: 'text', required: true, defaultValue: '1', validation: capacity},
            {name: 'desiredCapacity', label: 'Desired', type: 'text', required: false, defaultValue: '1', validation: capacity, description: 'How many instances to run now. Between the minimum and the maximum.'},
            {name: 'maxSize', label: 'Maximum', type: 'text', required: true, defaultValue: '2', validation: capacity},
            {
                name: 'subnets',
                label: 'Subnets',
                type: 'text',
                required: false,
                span: true,
                description: 'Subnet IDs to launch into, separated by commas. Leave empty for the default subnets.',
                validation: {pattern: '^\\s*subnet-[\\w-]+(\\s*,\\s*subnet-[\\w-]+)*\\s*$', message: 'Use subnet IDs separated by commas'},
            },
            {
                name: 'targetGroupArns',
                label: 'Target groups',
                type: 'textarea',
                required: false,
                span: true,
                description: 'Optional load balancer target group ARNs, one per line. Instances are registered with them as they launch.',
            },
            {
                name: 'healthCheckType',
                label: 'Health check',
                type: 'select',
                required: false,
                defaultValue: 'EC2',
                options: [
                    {label: 'EC2 instance status', value: 'EC2'},
                    {label: 'Load balancer health checks', value: 'ELB'},
                ],
            },
        ],
        actions: ['list', 'create', 'delete', 'inspect'],
        capabilities: {
            resourceActions: [
                {name: 'list', label: 'List Auto Scaling groups', enabled: true, status: 'available', runtimeRequired: true},
                {name: 'create', label: 'Create Auto Scaling group', enabled: true, status: 'available', runtimeRequired: true},
                {name: 'delete', label: 'Delete group and its instances', enabled: true, status: 'available', runtimeRequired: true},
                {name: 'inspect', label: 'Inspect Auto Scaling group', enabled: true, status: 'available', runtimeRequired: true},
            ],
            autoScalingActions: [
                {name: 'setCapacity', label: 'Change minimum, desired and maximum', enabled: true, status: 'available', runtimeRequired: true},
                {name: 'terminateInstance', label: 'Terminate an instance', enabled: true, status: 'available', runtimeRequired: true},
            ],
        },
        filters: groupFilters,
        columns: groupColumns,
    }
}

export function autoScalingSchemaFor(cloud: CloudProvider): ServiceSchema | null {
    return cloud === 'aws' ? awsAutoScalingSchema() : null
}