import { IsString, IsOptional, IsEnum, IsNumber, IsUUID, Min, Max } from 'class-validator';
import { Type } from 'class-transformer';
import { ApiProperty, ApiPropertyOptional, PartialType } from '@nestjs/swagger';
import { AssigneeType, AssignmentStatus } from '../entities/assignment.entity';
import { ProgressSource } from '../entities/progress-log.entity';

// ─────────────────────────────────────────────
// Create Assignment DTO
// ─────────────────────────────────────────────

export class CreateAssignmentDto {
  @ApiProperty()
  @IsUUID('4', { message: 'El ID de definicion debe ser un UUID valido' })
  definitionId: string;

  @ApiPropertyOptional({ enum: AssigneeType, default: AssigneeType.USER })
  @IsOptional()
  @IsEnum(AssigneeType, { message: 'El tipo de asignado debe ser un valor valido' })
  assigneeType?: AssigneeType;

  @ApiPropertyOptional()
  @IsOptional()
  @IsUUID('4', { message: 'El ID de usuario debe ser un UUID valido' })
  userId?: string;

  @ApiPropertyOptional()
  @IsOptional()
  @IsUUID('4', { message: 'El ID de equipo debe ser un UUID valido' })
  teamId?: string;

  @ApiPropertyOptional({ example: 50000 })
  @IsOptional()
  @IsNumber({}, { message: 'El objetivo personalizado debe ser un numero' })
  @Min(0, { message: 'El objetivo personalizado debe ser mayor o igual a 0' })
  customTarget?: number;

  @ApiPropertyOptional()
  @IsOptional()
  @IsString({ message: 'Las notas deben ser una cadena de texto' })
  notes?: string;
}

// ─────────────────────────────────────────────
// Update Assignment DTO
// ─────────────────────────────────────────────

export class UpdateAssignmentDto extends PartialType(CreateAssignmentDto) {}

// ─────────────────────────────────────────────
// Update Assignment Status DTO
// ─────────────────────────────────────────────

export class UpdateAssignmentStatusDto {
  @ApiProperty({ enum: AssignmentStatus })
  @IsEnum(AssignmentStatus)
  status: AssignmentStatus;
}

// ─────────────────────────────────────────────
// Update Progress DTO
// ─────────────────────────────────────────────

export class UpdateProgressDto {
  @ApiProperty({ example: 25000 })
  @IsNumber({}, { message: 'El valor debe ser un numero' })
  @Min(0, { message: 'El valor debe ser mayor o igual a 0' })
  value: number;

  @ApiPropertyOptional({ enum: ProgressSource, default: ProgressSource.MANUAL })
  @IsOptional()
  @IsEnum(ProgressSource, { message: 'La fuente de progreso debe ser un valor valido' })
  source?: ProgressSource;

  @ApiPropertyOptional()
  @IsOptional()
  @IsString({ message: 'La referencia de fuente debe ser una cadena de texto' })
  sourceReference?: string;

  @ApiPropertyOptional()
  @IsOptional()
  @IsString({ message: 'Las notas deben ser una cadena de texto' })
  notes?: string;
}

// ─────────────────────────────────────────────
// Assignment Response DTO
// ─────────────────────────────────────────────

export class AssignmentResponseDto {
  @ApiProperty()
  id: string;

  @ApiProperty()
  tenantId: string;

  @ApiProperty()
  definitionId: string;

  @ApiProperty({ enum: AssigneeType })
  assigneeType: AssigneeType;

  @ApiPropertyOptional()
  userId: string | null;

  @ApiPropertyOptional()
  teamId: string | null;

  @ApiPropertyOptional()
  customTarget: number | null;

  @ApiProperty()
  currentValue: number;

  @ApiProperty()
  progressPercentage: number;

  @ApiPropertyOptional()
  lastUpdatedAt: Date | null;

  @ApiProperty({ enum: AssignmentStatus })
  status: AssignmentStatus;

  @ApiPropertyOptional()
  achievedAt: Date | null;

  @ApiPropertyOptional()
  notes: string | null;

  @ApiProperty()
  createdAt: Date;

  @ApiProperty()
  updatedAt: Date;

  // Nested objects
  @ApiPropertyOptional()
  definition?: {
    id: string;
    name: string;
    targetValue: number;
    unit: string | null;
    startsAt: Date;
    endsAt: Date;
  };

  @ApiPropertyOptional()
  user?: {
    id: string;
    email: string;
    firstName: string | null;
    lastName: string | null;
  };
}

// ─────────────────────────────────────────────
// Assignment Filters DTO
// ─────────────────────────────────────────────

export class AssignmentFiltersDto {
  @ApiPropertyOptional()
  @IsOptional()
  @IsUUID('4', { message: 'El ID de definicion debe ser un UUID valido' })
  definitionId?: string;

  @ApiPropertyOptional()
  @IsOptional()
  @IsUUID('4', { message: 'El ID de usuario debe ser un UUID valido' })
  userId?: string;

  @ApiPropertyOptional({ enum: AssignmentStatus })
  @IsOptional()
  @IsEnum(AssignmentStatus, { message: 'El estado debe ser un valor valido' })
  status?: AssignmentStatus;

  @ApiPropertyOptional({ enum: AssigneeType })
  @IsOptional()
  @IsEnum(AssigneeType, { message: 'El tipo de asignado debe ser un valor valido' })
  assigneeType?: AssigneeType;

  @ApiPropertyOptional({ description: 'Minimum progress percentage' })
  @IsOptional()
  @Type(() => Number)
  @IsNumber({}, { message: 'El progreso minimo debe ser un numero' })
  @Min(0, { message: 'El progreso minimo debe ser mayor o igual a 0%' })
  @Max(100, { message: 'El progreso minimo debe ser menor o igual a 100%' })
  minProgress?: number;

  @ApiPropertyOptional({ description: 'Maximum progress percentage' })
  @IsOptional()
  @Type(() => Number)
  @IsNumber({}, { message: 'El progreso maximo debe ser un numero' })
  @Min(0, { message: 'El progreso maximo debe ser mayor o igual a 0%' })
  @Max(100, { message: 'El progreso maximo debe ser menor o igual a 100%' })
  maxProgress?: number;

  @ApiPropertyOptional({ example: 'progressPercentage' })
  @IsOptional()
  @IsString()
  sortBy?: string;

  @ApiPropertyOptional({ enum: ['ASC', 'DESC'], default: 'DESC' })
  @IsOptional()
  @IsString()
  sortOrder?: 'ASC' | 'DESC';

  @ApiPropertyOptional({ default: 1 })
  @IsOptional()
  @Type(() => Number)
  @IsNumber()
  page?: number;

  @ApiPropertyOptional({ default: 20 })
  @IsOptional()
  @Type(() => Number)
  @IsNumber()
  limit?: number;
}

// ─────────────────────────────────────────────
// Progress Log Response DTO
// ─────────────────────────────────────────────

export class ProgressLogResponseDto {
  @ApiProperty()
  id: string;

  @ApiProperty()
  assignmentId: string;

  @ApiPropertyOptional()
  previousValue: number | null;

  @ApiProperty()
  newValue: number;

  @ApiPropertyOptional()
  changeAmount: number | null;

  @ApiProperty({ enum: ProgressSource })
  source: ProgressSource;

  @ApiPropertyOptional()
  sourceReference: string | null;

  @ApiPropertyOptional()
  notes: string | null;

  @ApiProperty()
  loggedAt: Date;

  @ApiPropertyOptional()
  loggedBy: string | null;
}

// ─────────────────────────────────────────────
// My Goals Summary DTO
// ─────────────────────────────────────────────

export class MyGoalsSummaryDto {
  @ApiProperty()
  totalAssignments: number;

  @ApiProperty()
  activeAssignments: number;

  @ApiProperty()
  achievedAssignments: number;

  @ApiProperty()
  failedAssignments: number;

  @ApiProperty()
  averageProgress: number;

  @ApiProperty()
  atRiskCount: number; // < 50% progress with > 75% time elapsed
}

// ─────────────────────────────────────────────
// Goal Report DTOs
// ─────────────────────────────────────────────

export class CompletionReportDto {
  @ApiProperty()
  totalGoals: number;

  @ApiProperty()
  achievedGoals: number;

  @ApiProperty()
  failedGoals: number;

  @ApiProperty()
  activeGoals: number;

  @ApiProperty()
  completionRate: number;

  @ApiProperty()
  averageProgress: number;
}

export class UserReportDto {
  @ApiProperty()
  userId: string;

  @ApiPropertyOptional()
  userName: string | null;

  @ApiProperty()
  totalAssignments: number;

  @ApiProperty()
  achieved: number;

  @ApiProperty()
  failed: number;

  @ApiProperty()
  active: number;

  @ApiProperty()
  averageProgress: number;
}