import {
  Entity,
  PrimaryGeneratedColumn,
  Column,
  CreateDateColumn,
  UpdateDateColumn,
  Index,
  Unique,
} from 'typeorm';

export type UsageType = 'chat' | 'completion' | 'embedding' | 'image';

@Entity({ name: 'usage_logs', schema: 'ai' })
export class AIUsageLog {
  @PrimaryGeneratedColumn('uuid')
  id: string;

  @Index()
  @Column({ name: 'tenant_id', type: 'uuid' })
  tenantId: string;

  @Column({ name: 'user_id', type: 'uuid', nullable: true })
  userId: string;

  @Index()
  @Column({ name: 'model_id', type: 'uuid', nullable: true })
  modelId: string;

  @Column({ name: 'model_name', type: 'varchar', length: 100, nullable: true })
  modelName: string;

  @Column({ name: 'provider', type: 'varchar', length: 50, nullable: true })
  provider: string;

  @Column({ name: 'usage_type', type: 'varchar', length: 30 })
  usageType: UsageType;

  @Column({ name: 'prompt_tokens', type: 'int', default: 0 })
  promptTokens: number;

  @Column({ name: 'completion_tokens', type: 'int', default: 0 })
  completionTokens: number;

  @Column({ name: 'total_tokens', type: 'int', default: 0 })
  totalTokens: number;

  @Column({ name: 'cost', type: 'decimal', precision: 10, scale: 6, default: 0 })
  cost: number;

  @Column({ name: 'conversation_id', type: 'uuid', nullable: true })
  conversationId: string;

  @Column({ name: 'completion_id', type: 'uuid', nullable: true })
  completionId: string;

  @Column({ name: 'request_id', type: 'varchar', length: 255, nullable: true })
  requestId: string;

  @Index()
  @Column({ name: 'usage_date', type: 'date', default: () => 'CURRENT_DATE' })
  usageDate: Date;

  @Index()
  @Column({ name: 'usage_month', type: 'varchar', length: 7, nullable: true })
  usageMonth: string;

  @CreateDateColumn({ name: 'created_at', type: 'timestamptz' })
  createdAt: Date;
}

@Entity({ name: 'tenant_quotas', schema: 'ai' })
@Unique(['tenantId', 'quotaMonth'])
export class AITenantQuota {
  @PrimaryGeneratedColumn('uuid')
  id: string;

  @Index()
  @Column({ name: 'tenant_id', type: 'uuid' })
  tenantId: string;

  @Column({ name: 'monthly_token_limit', type: 'int', nullable: true })
  monthlyTokenLimit: number;

  @Column({ name: 'monthly_request_limit', type: 'int', nullable: true })
  monthlyRequestLimit: number;

  @Column({ name: 'monthly_cost_limit', type: 'decimal', precision: 10, scale: 2, nullable: true })
  monthlyCostLimit: number;

  @Column({ name: 'current_tokens', type: 'int', default: 0 })
  currentTokens: number;

  @Column({ name: 'current_requests', type: 'int', default: 0 })
  currentRequests: number;

  @Column({ name: 'current_cost', type: 'decimal', precision: 10, scale: 4, default: 0 })
  currentCost: number;

  @Index()
  @Column({ name: 'quota_month', type: 'varchar', length: 7 })
  quotaMonth: string;

  @Column({ name: 'is_exceeded', type: 'boolean', default: false })
  isExceeded: boolean;

  @Column({ name: 'exceeded_at', type: 'timestamptz', nullable: true })
  exceededAt: Date;

  @Column({ name: 'alert_threshold_percent', type: 'int', default: 80 })
  alertThresholdPercent: number;

  @Column({ name: 'alert_sent_at', type: 'timestamptz', nullable: true })
  alertSentAt: Date;

  @CreateDateColumn({ name: 'created_at', type: 'timestamptz' })
  createdAt: Date;

  @UpdateDateColumn({ name: 'updated_at', type: 'timestamptz' })
  updatedAt: Date;
}