import {Component, Inject, OnInit} from '@angular/core';
import {MatTableDataSource} from "@angular/material/table";
import {Client} from "../../../groups/model/model";
import {ToastrService} from "ngx-toastr";
import {HttpClient} from "@angular/common/http";
import {MAT_DIALOG_DATA, MatDialog, MatDialogRef} from "@angular/material/dialog";
import {ConfigService} from "@services/config.service";
import {DeleteModalComponent} from "../../../../shared/delete_modal/delete-modal/delete-modal.component";
import {CreateTaskScheduleComponent} from "../create-task-schedule/create-task-schedule.component";
import {DatePipe} from "@angular/common";

@Component({
  selector: 'app-show-task-schedule',
  templateUrl: './show-task-schedule.component.html',
  styleUrl: './show-task-schedule.component.css'
})
export class ShowTaskScheduleComponent implements OnInit{
  baseUrl: string;
  dataSource = new MatTableDataSource<any>([]);
  length = 0;
  itemsPerPage: number = 10;
  pageSizeOptions: number[] = [5, 10, 20];
  page = 0;
  loading: boolean = false;
  filters: { [key: string]: string } = {};
  datePipe: DatePipe = new DatePipe('es-ES');

  columns = [
    { columnDef: 'id', header: 'ID', cell: (schedule: any) => schedule.id },
    { columnDef: 'recurrenceType', header: 'Tipo de Programación', cell: (schedule: any) => this.getRecurrenceTypeDisplay(schedule) },
    { columnDef: 'executionTime', header: 'Hora de ejecución', cell: (schedule: any) => this.datePipe.transform(schedule.executionTime, 'HH:mm') },
    { columnDef: 'nextExecution', header: 'Próxima ejecución', cell: (schedule: any) => this.calculateNextExecution(schedule) },
    { columnDef: 'daysOfWeek', header: 'Días de la semana', cell: (schedule: any) => this.formatDaysOfWeek(schedule.recurrenceDetails?.daysOfWeek) },
    { columnDef: 'months', header: 'Meses', cell: (schedule: any) => this.formatMonths(schedule.recurrenceDetails?.months) },
    { columnDef: 'enabled', header: 'Estado', cell: (schedule: any) => schedule.enabled }
  ];

  displayedColumns: string[] = ['id', 'recurrenceType', 'executionTime', 'nextExecution', 'daysOfWeek', 'months', 'enabled', 'actions'];

  constructor(
    private toastService: ToastrService,
    private http: HttpClient,
    public dialogRef: MatDialogRef<ShowTaskScheduleComponent>,
    public dialog: MatDialog,
    private configService: ConfigService,
    @Inject(MAT_DIALOG_DATA) public data: any
  ) {
    this.baseUrl = this.configService.apiUrl;
  }

  ngOnInit(): void {
    if (this.data) {
      this.loadData();
    }
  }

  loadData() {
    this.loading = true;
    this.http.get<any>(`${this.baseUrl}/command-task-schedules?page=${this.page + 1}&itemsPerPage=${this.itemsPerPage}&commandTask.id=${this.data.commandTask?.id}`, { params: this.filters }).subscribe(
      (data) => {
        this.dataSource.data = data['hydra:member'];
        this.length = data['hydra:totalItems'];
        this.loading = false;
      },
      (error) => {
        this.loading = false;
        this.toastService.error('Error al cargar las programaciones');
      }
    );
  }

  createNewSchedule(): void {
    this.dialog.open(CreateTaskScheduleComponent, {
      width: '800px',
      data: { task: this.data.commandTask }
    }).afterClosed().subscribe(result => {
      if (result) {
        this.loadData();
        this.toastService.success('Programación creada correctamente');
      }
    });
  }

  editSchedule(schedule: any): void {
    this.dialog.open(CreateTaskScheduleComponent, {
      width: '800px',
      data: { schedule: schedule, task: this.data.commandTask }
    }).afterClosed().subscribe(result => {
      if (result) {
        this.loadData();
        this.toastService.success('Programación actualizada correctamente');
      }
    });
  }

  deleteSchedule(schedule: any): void {
    const dialogRef = this.dialog.open(DeleteModalComponent, {
      width: '300px',
      data: { name: 'programación de tarea' }
    });

    dialogRef.afterClosed().subscribe(result => {
      if (result) {
        this.http.delete(`${this.baseUrl}${schedule['@id']}`).subscribe(
          () => {
            this.toastService.success('Programación eliminada correctamente');
            this.loadData();
          },
          (error) => {
            this.toastService.error(error.error['hydra:description'] || 'Error al eliminar la programación');
          }
        );
      }
    })
  }

  calculateNextExecution(schedule: any): string {
    if (!schedule.enabled) {
      return 'Deshabilitada';
    }

    try {
      if (schedule.recurrenceType === 'none') {
        if (schedule.executionDate && schedule.executionTime) {
          const executionDate = new Date(schedule.executionDate);
          const [hours, minutes] = this.parseExecutionTime(schedule.executionTime);
          const fullExecutionDateTime = new Date(
            executionDate.getFullYear(),
            executionDate.getMonth(),
            executionDate.getDate(),
            hours,
            minutes,
            0,
            0
          );

          const now = new Date();
          if (fullExecutionDateTime < now) {
            return 'Ya ejecutada';
          }

          return this.datePipe.transform(fullExecutionDateTime, 'dd/MM/yyyy HH:mm') || 'Fecha inválida';
        }
        return 'Sin fecha/hora definida';
      }

      // Personalizada (u otros tipos con detalles): calcular siguiente ejecución real
      if (schedule.recurrenceDetails) {
        const startDate = schedule.recurrenceDetails.initDate ? new Date(schedule.recurrenceDetails.initDate) : null;
        const endDate = schedule.recurrenceDetails.endDate ? new Date(schedule.recurrenceDetails.endDate) : null;
        const days = Array.isArray(schedule.recurrenceDetails.daysOfWeek) ? schedule.recurrenceDetails.daysOfWeek : [];
        const months = Array.isArray(schedule.recurrenceDetails.months) ? schedule.recurrenceDetails.months : [];

        if (!startDate || !endDate || days.length === 0 || months.length === 0) {
          return 'Configuración incompleta';
        }

        const selectedDayIndices = new Set<number>(days.map((d: string) => this.getDayIndexFromName(d)));
        const selectedMonthIndices = new Set<number>(months.map((m: string) => this.getMonthIndexFromName(m)));
        const [hours, minutes] = this.parseExecutionTime(schedule.executionTime);

        const next = this.findNextExecutionDate(startDate, endDate, hours, minutes, selectedDayIndices, selectedMonthIndices);
        if (next) {
          return this.datePipe.transform(next, 'dd/MM/yyyy HH:mm') || 'Fecha inválida';
        }
        return 'No hay próximas ejecuciones';
      }

      return 'Configuración incompleta';
    } catch (error) {
      return 'Error en cálculo';
    }
  }

  private parseExecutionTime(executionTime: any): [number, number] {
    if (typeof executionTime === 'string') {
      const match = executionTime.match(/^(\d{2}):(\d{2})/);
      if (match) {
        return [parseInt(match[1], 10), parseInt(match[2], 10)];
      }
      const parsed = new Date(executionTime);
      if (!isNaN(parsed.getTime())) {
        return [parsed.getHours(), parsed.getMinutes()];
      }
      return [0, 0];
    }
    if (executionTime instanceof Date && !isNaN(executionTime.getTime())) {
      return [executionTime.getHours(), executionTime.getMinutes()];
    }
    return [0, 0];
  }

  private findNextExecutionDate(startDate: Date, endDate: Date, hours: number, minutes: number, selectedDays: Set<number>, selectedMonths: Set<number>): Date | null {
    const now = new Date();

    const startCandidate = new Date(Math.max(new Date(startDate).setHours(0, 0, 0, 0), new Date(now).setHours(0, 0, 0, 0)));
    const endLimit = new Date(endDate);
    endLimit.setHours(23, 59, 59, 999);

    const cursor = new Date(startCandidate);
    while (cursor <= endLimit) {
      if (selectedMonths.has(cursor.getMonth()) && selectedDays.has(cursor.getDay())) {
        const candidateDateTime = new Date(cursor);
        candidateDateTime.setHours(hours, minutes, 0, 0);
        if (candidateDateTime >= now) {
          return candidateDateTime;
        }
      }
      cursor.setDate(cursor.getDate() + 1);
    }
    return null;
  }

  private getDayIndexFromName(dayName: string): number {
    const mapping: { [key: string]: number } = {
      sunday: 0,
      monday: 1,
      tuesday: 2,
      wednesday: 3,
      thursday: 4,
      friday: 5,
      saturday: 6
    };
    return mapping[dayName?.toLowerCase?.()] ?? -1;
  }

  private getMonthIndexFromName(monthName: string): number {
    const mapping: { [key: string]: number } = {
      january: 0,
      february: 1,
      march: 2,
      april: 3,
      may: 4,
      june: 5,
      july: 6,
      august: 7,
      september: 8,
      october: 9,
      november: 10,
      december: 11
    };
    return mapping[monthName?.toLowerCase?.()] ?? -1;
  }

  onPageChange(event: any): void {
    this.page = event.pageIndex;
    this.itemsPerPage = event.pageSize;
    this.loadData();
  }

  onNoClick(): void {
    this.dialogRef.close(false);
  }

  getRecurrenceTypeDisplay(schedule: any): any {
    if (schedule.recurrenceType === 'none') {
      return {
        type: 'none',
        label: 'Ejecución única',
        icon: 'event',
        color: 'primary',
        details: schedule.executionDate ? 
          `Fecha: ${this.datePipe.transform(schedule.executionDate, 'dd/MM/yyyy')}` : 
          'Sin fecha definida'
      };
    } else if (schedule.recurrenceType === 'daily') {
      return {
        type: 'daily',
        label: 'Diaria',
        icon: 'repeat',
        color: 'accent',
        details: 'Todos los días'
      };
    } else if (schedule.recurrenceType === 'weekly') {
      return {
        type: 'weekly',
        label: 'Semanal',
        icon: 'view_week',
        color: 'accent',
        details: schedule.recurrenceDetails?.daysOfWeek?.length > 0 ? 
          `Días: ${schedule.recurrenceDetails.daysOfWeek.join(', ')}` : 
          'Todos los días'
      };
    } else if (schedule.recurrenceType === 'monthly') {
      return {
        type: 'monthly',
        label: 'Mensual',
        icon: 'calendar_month',
        color: 'accent',
        details: schedule.recurrenceDetails?.months?.length > 0 ? 
          `Meses: ${schedule.recurrenceDetails.months.join(', ')}` : 
          'Todos los meses'
      };
    } else if (schedule.recurrenceType === 'yearly') {
      return {
        type: 'yearly',
        label: 'Anual',
        icon: 'event_note',
        color: 'accent',
        details: 'Una vez al año'
      };
    } else {
      return {
        type: 'custom',
        label: 'Personalizada',
        icon: 'settings',
        color: 'warn',
        details: 'Configuración especial'
      };
    }
  }

  formatDaysOfWeek(days: string[]): any {
    if (!days || days.length === 0) return null;
    
    const dayMap: { [key: string]: string } = {
      'monday': 'Lun',
      'tuesday': 'Mar', 
      'wednesday': 'Mié',
      'thursday': 'Jue',
      'friday': 'Vie',
      'saturday': 'Sáb',
      'sunday': 'Dom'
    };
    
    return {
      days: days.map(day => dayMap[day.toLowerCase()] || day),
      count: days.length
    };
  }

  formatMonths(months: string[]): any {
    if (!months || months.length === 0) return null;
    
    const monthMap: { [key: string]: string } = {
      'january': 'Ene',
      'february': 'Feb',
      'march': 'Mar',
      'april': 'Abr',
      'may': 'May',
      'june': 'Jun',
      'july': 'Jul',
      'august': 'Ago',
      'september': 'Sep',
      'october': 'Oct',
      'november': 'Nov',
      'december': 'Dic'
    };
    
    return {
      months: months.map(month => monthMap[month.toLowerCase()] || month),
      count: months.length
    };
  }
}