import { Component, computed, inject } from '@angular/core';
import { Router } from '@angular/router';
import { IssueEntity, IssuesStore } from '../issues/issues.store';
import { MilestoneEntity, MilestonesStore } from '../milestones/milestones.store';
import { StatusesStore } from '../statuses/statuses.store';
import { ProjectContextService } from '../projects/project-context.service';

@Component({
  selector: 'app-dashboard',
  imports: [],
  templateUrl: './dashboard.html',
  styleUrl: './dashboard.css',
})
export class Dashboard {
  private readonly router = inject(Router);
  private readonly issuesStore = inject(IssuesStore);
  private readonly milestonesStore = inject(MilestonesStore);
  private readonly statusesStore = inject(StatusesStore);
  private readonly projectContext = inject(ProjectContextService);

  constructor() {
    const projectId = this.projectContext.projectId()!;
    this.issuesStore.load(projectId);
    this.milestonesStore.load(projectId);
  }

  protected readonly totalIssues = computed(() => this.issuesStore.issues().length);

  protected readonly statusCounts = computed(() => ({
    draft: this.issuesStore.issues().filter((i) => i.status === 'draft').length,
    todo: this.issuesStore.issues().filter((i) => i.status === 'todo').length,
    inProgress: this.issuesStore.issues().filter((i) => i.status === 'in-progress').length,
    done: this.issuesStore.issues().filter((i) => i.status === 'done').length,
  }));

  protected readonly completionRate = computed(() => {
    const total = this.totalIssues();
    if (total === 0) return 0;
    const done = this.issuesStore.issues().filter((i) => this.statusesStore.isCompleted(i.status)).length;
    return Math.round((done / total) * 100);
  });

  protected readonly totalMilestones = computed(() => this.milestonesStore.milestones().length);

  protected readonly statusItems = computed(() =>
    (['todo', 'in-progress', 'draft', 'done'] as IssueEntity['status'][]).map((status) => ({
      status,
      count: this.issuesStore.issues().filter((i) => i.status === status).length,
    })),
  );

  protected readonly issuesByType = computed(() => {
    const types: IssueEntity['type'][] = ['Epic', 'Bug', 'Study', 'Story', 'Task', 'Technical Story'];
    return types
      .map((type) => ({
        type,
        count: this.issuesStore.issues().filter((i) => i.type === type).length,
        icon: this.typeIcon(type),
      }))
      .filter((t) => t.count > 0);
  });

  protected readonly highPriorityIssues = computed(() =>
    this.issuesStore
      .issues()
      .filter((i) => (i.priority === 'HAUTE' || i.priority === 'TRES_HAUTE') && !this.statusesStore.isCompleted(i.status))
      .slice(0, 6),
  );

  protected readonly activeMilestones = computed(() =>
    this.milestonesStore
      .milestones()
      .map((m) => ({ ...m, progress: this.getMilestoneProgress(m) }))
      .filter((m) => m.progress < 100)
      .slice(0, 5),
  );

  protected readonly upcomingIssues = computed(() => {
    const now = new Date();
    const twoWeeks = new Date(now.getTime() + 14 * 24 * 60 * 60 * 1000);
    return this.issuesStore
      .issues()
      .filter((i) => {
        if (!i.dueDate || this.statusesStore.isCompleted(i.status)) return false;
        const due = new Date(i.dueDate);
        return due >= now && due <= twoWeeks;
      })
      .sort((a, b) => new Date(a.dueDate).getTime() - new Date(b.dueDate).getTime())
      .slice(0, 6);
  });

  protected readonly overdueCount = computed(() => {
    const now = new Date();
    return this.issuesStore.issues().filter((i) => {
      if (!i.dueDate || this.statusesStore.isCompleted(i.status)) return false;
      return new Date(i.dueDate) < now;
    }).length;
  });

  private getMilestoneProgress(milestone: MilestoneEntity): number {
    if (milestone.issueIds.length === 0) return 0;
    const linked = this.issuesStore.issues().filter((i) => milestone.issueIds.includes(i.id));
    if (linked.length === 0) return 0;
    return Math.round((linked.filter((i) => this.statusesStore.isCompleted(i.status)).length / linked.length) * 100);
  }

  protected formatDate(iso: string): string {
    if (!iso) return '—';
    const d = new Date(iso);
    const day = String(d.getDate()).padStart(2, '0');
    const month = String(d.getMonth() + 1).padStart(2, '0');
    const year = d.getFullYear();
    return `${day}/${month}/${year}`;
  }

  protected typeIcon(type: IssueEntity['type']): { letter: string; bg: string } {
    const map: Record<IssueEntity['type'], { letter: string; bg: string }> = {
      Epic: { letter: 'E', bg: '#7c3aed' },
      Bug: { letter: 'B', bg: '#dc2626' },
      Story: { letter: 'S', bg: '#16a34a' },
      Task: { letter: 'T', bg: '#2563eb' },
      Study: { letter: 'St', bg: '#6b7280' },
      'Technical Story': { letter: 'TS', bg: '#d97706' },
    };
    return map[type] ?? { letter: '?', bg: '#6b7280' };
  }

  protected priorityDisplay(priority: IssueEntity['priority']): {
    symbol: string;
    color: string;
    label: string;
  } {
    const map: Record<IssueEntity['priority'], { symbol: string; color: string; label: string }> = {
      TRES_HAUTE: { symbol: '↑↑', color: '#dc3545', label: 'Très haute' },
      HAUTE: { symbol: '↑', color: '#fd7e14', label: 'Haute' },
      MOYENNE: { symbol: '–', color: '#ffc107', label: 'Moyenne' },
      BASSE: { symbol: '↓', color: '#0d6efd', label: 'Basse' },
      TRES_FAIBLE: { symbol: '↓↓', color: '#6c757d', label: 'Très faible' },
    };
    return map[priority] ?? { symbol: '?', color: '#6c757d', label: priority };
  }

  protected statusBadge(status: IssueEntity['status']): {
    label: string;
    bg: string;
    color: string;
  } {
    const map: Record<IssueEntity['status'], { label: string; bg: string; color: string }> = {
      draft: { label: 'BROUILLON', bg: '#e2e8f0', color: '#475569' },
      todo: { label: 'À FAIRE', bg: '#dbeafe', color: '#1d4ed8' },
      'in-progress': { label: 'EN COURS', bg: '#ffedd5', color: '#9a3412' },
      done: { label: 'TERMINÉ', bg: '#dcfce7', color: '#166534' },
    };
    return map[status] ?? { label: status, bg: '#e2e8f0', color: '#475569' };
  }

  protected openIssue(id: number): void {
    const pid = this.projectContext.projectId();
    this.router.navigate(['/projects', pid, 'issues', id]);
  }

  protected openMilestone(id: number): void {
    const pid = this.projectContext.projectId();
    this.router.navigate(['/projects', pid, 'milestones', id]);
  }

  protected navigateToIssues(): void {
    const pid = this.projectContext.projectId();
    this.router.navigate(['/projects', pid, 'issues']);
  }

  protected navigateToMilestones(): void {
    const pid = this.projectContext.projectId();
    this.router.navigate(['/projects', pid, 'milestones']);
  }
}