import { IsEmail, IsArray, ArrayNotEmpty, ArrayUnique, IsISO8601, IsIn, IsOptional, IsString, IsNumber, Min, Max, IsEnum } from "class-validator";
import { LeaveApprovalStatus, LeaveTypes } from "@prisma/client";
import { LeaveRequestViewDto } from "./leave-request-view.dto";
import { Type } from "class-transformer";

//sets wich function to call
export const UPSERT_ACTIONS = ['create', 'update', 'delete'] as const;
export type  UpsertAction   = (typeof UPSERT_ACTIONS)[number];

//sets wich types to use
export const REQUEST_TYPES    = Object.values(LeaveTypes) as readonly LeaveTypes[];
export type  RequestTypes = (typeof REQUEST_TYPES)[number];

//filter requests by type and action
export interface UpsertResult {
    action: UpsertAction;
    leave_requests: LeaveRequestViewDto[];
}

export class UpsertLeaveRequestDto {
    @IsEmail()
    email!: string;

    @IsArray()
    @ArrayNotEmpty()
    @ArrayUnique()
    @IsISO8601({}, { each: true })
    dates!: string[];

    @IsOptional()
    @IsEnum(LeaveTypes)
    type!: string;

    @IsIn(UPSERT_ACTIONS)
    action!: UpsertAction;

    @IsOptional()
    @IsString()
    comment?: string;

    @IsOptional()
    @Type(() => Number)
    @IsNumber({ maxDecimalPlaces: 2 })
    @Min(0)
    @Max(24)
    requested_hours?: number;

    @IsOptional()
    @IsEnum(LeaveApprovalStatus)
    approval_status?: LeaveApprovalStatus
}