export type ServerboundPacket = Sync | Handshake | ListTasks | ListInstances | UpdateTask | RemoveTask
export type ClientboundPacket = Handshake | Error | TaskList | InstanceList | Sync

interface Sync { type: "sync", data: null }
interface Error { type: "error", data: { kind: "unknown_task", details: null } | { kind: "format_error", details: string } }
interface Handshake { type: "handshake", data: { version: string } }
interface ListTasks { type: "list_tasks", data: null }
interface TaskList { type: "task_list", data: Task[] }
interface ListInstances { type: "list_instances", data: null }
interface InstanceList { type: "instance_list", data: Instance[] }
interface UpdateTask { type: "update_task", data: Task }
interface RemoveTask { type: "remove_task", data: number }

interface Instance { of: number, at: Range }
interface Range { start?: number, end?: number }
interface Task {
    id: number
    name: string,
    description: string,

    tags: string[],
    priority: number,

    completed?: number,
    scheduled?: number,

    occurence?: Condition,
    deadline?: Condition,
}

export type Condition = { from?: Condition }
    | { or?: Condition[] }
    | { and?: Condition[] }
    | { equal?: { prop: Thing, value: number, mod?: number } }
    | { range?: { prop: Thing, min: number, max: number, mod?: number } }

type Thing = "year"
    | "monthofyear"
    | "weekofmonth"
    | "dayofyear"
    | "dayofmonth"
    | "dayofweek"
    | "hour"
    | "minute"
    | "second"
    | "unix"

/*
    examples:

    11:00 - 12:00 every first monday of the month

    and: [
        { range: { prop: "hour", min: 11, max: 12 } },
        { equal: { prop: "dayofweek", value: 0 } },
        { equal: { prop: "weekofmonth", value: 0 } }
    ]

*/