import { IsEmail, IsISO8601, IsOptional, IsString, Matches, MaxLength } from 'class-validator'

// IANA timezone sanity check (Area/Location, optionally a third segment). Not a
// full tz-database membership test — Luxon rejects unknown zones downstream.
const TZ = /^[A-Za-z]+\/[A-Za-z0-9_+-]+(\/[A-Za-z0-9_+-]+)?$/

export class SlotsQueryDto {
  @IsISO8601()
  from!: string

  @IsISO8601()
  to!: string

  @IsString()
  @MaxLength(64)
  @Matches(TZ, { message: 'timezone must be an IANA zone like Europe/Copenhagen' })
  timezone!: string
}

export class CreateHoldDto {
  @IsISO8601()
  startUtc!: string

  // Optional captcha token (e.g. Cloudflare Turnstile). Enforced server-side
  // only when a captcha provider is configured; ignored otherwise.
  @IsOptional()
  @IsString()
  @MaxLength(4096)
  captchaToken?: string
}

export class CreateBookingDto {
  @IsISO8601()
  startUtc!: string

  @IsString()
  @MaxLength(120)
  attendeeName!: string

  @IsEmail()
  @MaxLength(254)
  attendeeEmail!: string

  @IsString()
  @MaxLength(64)
  @Matches(TZ, { message: 'attendeeTimezone must be an IANA zone like Europe/Copenhagen' })
  attendeeTimezone!: string

  @IsOptional()
  @IsString()
  @MaxLength(2000)
  attendeeNotes?: string

  @IsOptional()
  @IsString()
  @MaxLength(64)
  holdId?: string

  // Optional captcha token (e.g. Cloudflare Turnstile). Enforced server-side
  // only when a captcha provider is configured; ignored otherwise.
  @IsOptional()
  @IsString()
  @MaxLength(4096)
  captchaToken?: string
}

export class CancelBookingDto {
  @IsOptional()
  @IsString()
  @MaxLength(500)
  reason?: string
}

export class RescheduleBookingDto {
  @IsISO8601()
  startUtc!: string
}