import { 
  IsEmail, 
  IsString, 
  IsEnum, 
  IsInt, 
  IsBoolean, 
  IsOptional, 
  IsUUID, 
  Min,
  IsDate 
} from 'class-validator';
import { ApiProperty, ApiPropertyOptional } from '@nestjs/swagger';
import { Plan } from '@prisma/client';

export class CreateUserDto {
  @ApiPropertyOptional({ 
    description: 'Google OAuth UID for OAuth integration',
    example: 'google_123456789'
  })
  @IsOptional()
  @IsString()
  googleUid?: string;

  @ApiProperty({ 
    description: 'User email address',
    example: 'user@example.com'
  })
  @IsEmail()
  email: string;

  @ApiProperty({ 
    description: 'Hashed version of email for privacy',
    example: 'a665a45920422f9d417e4867efdc4fb8a04a1f3fff1fa07e998e86f7f7a27ae3'
  })
  @IsString()
  emailHash: string;

  @ApiPropertyOptional({ 
    description: 'User subscription plan',
    enum: Plan,
    default: Plan.BASIC
  })
  @IsOptional()
  @IsEnum(Plan)
  plan?: Plan;

  @ApiPropertyOptional({ 
    description: 'Remaining quota for current period',
    example: 50,
    minimum: 0
  })
  @IsOptional()
  @IsInt()
  @Min(0)
  quotaRemaining?: number;
}

export class UpdateUserDto {
  @ApiPropertyOptional({ 
    description: 'User subscription plan',
    enum: Plan
  })
  @IsOptional()
  @IsEnum(Plan)
  plan?: Plan;

  @ApiPropertyOptional({ 
    description: 'Remaining quota for current period',
    minimum: 0
  })
  @IsOptional()
  @IsInt()
  @Min(0)
  quotaRemaining?: number;

  @ApiPropertyOptional({ 
    description: 'Whether the user account is active'
  })
  @IsOptional()
  @IsBoolean()
  isActive?: boolean;
}

export class UserResponseDto {
  @ApiProperty({ 
    description: 'Unique user identifier',
    example: '550e8400-e29b-41d4-a716-446655440000'
  })
  @IsUUID()
  id: string;

  @ApiPropertyOptional({ 
    description: 'Google OAuth UID',
    example: 'google_123456789'
  })
  @IsOptional()
  @IsString()
  googleUid?: string;

  @ApiProperty({ 
    description: 'User email address',
    example: 'user@example.com'
  })
  @IsEmail()
  email: string;

  @ApiProperty({ 
    description: 'User subscription plan',
    enum: Plan
  })
  @IsEnum(Plan)
  plan: Plan;

  @ApiProperty({ 
    description: 'Remaining quota for current period',
    example: 50
  })
  @IsInt()
  @Min(0)
  quotaRemaining: number;

  @ApiProperty({ 
    description: 'Date when quota resets'
  })
  @IsDate()
  quotaResetDate: Date;

  @ApiProperty({ 
    description: 'Whether the user account is active'
  })
  @IsBoolean()
  isActive: boolean;

  @ApiProperty({ 
    description: 'User creation timestamp'
  })
  @IsDate()
  createdAt: Date;

  @ApiProperty({ 
    description: 'User last update timestamp'
  })
  @IsDate()
  updatedAt: Date;
}

export class UserStatsDto {
  @ApiProperty({ 
    description: 'Total number of batches processed'
  })
  @IsInt()
  @Min(0)
  totalBatches: number;

  @ApiProperty({ 
    description: 'Total number of images processed'
  })
  @IsInt()
  @Min(0)
  totalImages: number;

  @ApiProperty({ 
    description: 'Current quota usage this period'
  })
  @IsInt()
  @Min(0)
  quotaUsed: number;

  @ApiProperty({ 
    description: 'Total quota for current plan'
  })
  @IsInt()
  @Min(0)
  totalQuota: number;

  @ApiProperty({ 
    description: 'Percentage of quota used'
  })
  @IsInt()
  @Min(0)
  quotaUsagePercentage: number;
}

// Helper function to get quota limits by plan
export function getQuotaLimitForPlan(plan: Plan): number {
  switch (plan) {
    case Plan.BASIC:
      return 50;
    case Plan.PRO:
      return 500;
    case Plan.MAX:
      return 1000;
    default:
      return 50;
  }
}

// Helper function to calculate quota reset date (monthly)
export function calculateQuotaResetDate(): Date {
  const now = new Date();
  const nextMonth = new Date(now.getFullYear(), now.getMonth() + 1, 1);
  return nextMonth;
}