import { signal } from '@angular/core';
import { ComponentFixture, TestBed } from '@angular/core/testing';
import { Router } from '@angular/router';
import { provideRouter } from '@angular/router';
import { vi } from 'vitest';
import { Issues } from './issues';
import { IssueEntity, IssuesStore } from './issues.store';
import { MilestoneEntity, MilestonesStore } from '../milestones/milestones.store';
import { StatusesStore } from '../statuses/statuses.store';
import { ProjectContextService } from '../projects/project-context.service';

const makeIssue = (overrides: Partial<IssueEntity> = {}): IssueEntity => ({
  id: 99,
  type: 'Story',
  assignee: '',
  epic: '',
  name: 'Test Issue',
  startDate: '',
  startDateMode: 'forced',
  endDate: '',
  dueDate: '',
  description: '',
  estimatedTime: null,
  dependsOnIds: [],
  comments: [],
  priority: 'MOYENNE',
  status: 'draft',
  progress: 50,
  ...overrides,
});

class FakeIssuesStore {
  private _data = signal<IssueEntity[]>([
    makeIssue({ id: 1, name: 'Issue 1', progress: 0 }),
    makeIssue({ id: 2, name: 'Issue 2', progress: 0 }),
    makeIssue({ id: 3, name: 'Issue 3', progress: 0 }),
  ]);

  readonly issues = this._data.asReadonly();
  readonly loading = signal(false);
  readonly loaded = signal(true);

  getById(id: number): IssueEntity | undefined {
    return this._data().find((i) => i.id === id);
  }

  getNextId(): number {
    const ids = this._data().map((i) => i.id);
    return ids.length === 0 ? 1 : Math.max(...ids) + 1;
  }

  load(): Promise<void> {
    return Promise.resolve();
  }

  upsert(issue: any): Promise<IssueEntity> {
    const { comments: c, estimatedTime: et, dependsOnIds: deps, dependsOnId: legacy, ...rest } = issue;
    const normalized: IssueEntity = {
      type: 'Story',
      assignee: '',
      epic: '',
      name: '',
      dueDate: '',
      description: '',
      estimatedTime: et ?? null,
      comments: Array.isArray(c) ? c : [],
      priority: 'MOYENNE',
      status: 'draft',
      progress: 0,
      ...rest,
      dependsOnIds: Array.isArray(deps)
        ? deps.filter((v: unknown) => typeof v === 'number')
        : typeof legacy === 'number'
          ? [legacy]
          : [],
    };
    this._data.update((issues) => {
      const idx = issues.findIndex((i) => i.id === normalized.id);
      if (idx === -1) return [...issues, normalized];
      const copy = [...issues];
      copy[idx] = normalized;
      return copy;
    });
    return Promise.resolve(normalized);
  }

  deleteById(id: number): Promise<void> {
    this._data.update((issues) =>
      issues
        .filter((i) => i.id !== id)
        .map((i) => ({ ...i, dependsOnIds: i.dependsOnIds.filter((d) => d !== id) })),
    );
    return Promise.resolve();
  }
}

const makeMilestone = (overrides: Partial<MilestoneEntity> = {}): MilestoneEntity => ({
  id: 1,
  name: 'Sprint 1',
  description: '',
  startDate: '',
  endDate: '',
  dueDate: '',
  issueIds: [],
  dependsOnIds: [],
  ...overrides,
});

class FakeStatusesStore {
  private completedIds = new Set<string>(['done']);

  setCompleted(ids: string[]): void {
    this.completedIds = new Set(ids);
  }

  isCompleted = vi.fn((statusId: string) => this.completedIds.has(statusId));
  getById = vi.fn((id: string) =>
    id === 'done'
      ? { id: 'done', label: 'TERMINÉ', bg: '#dcfce7', color: '#166534', order: 3, countsAsCompleted: true }
      : undefined,
  );
  readonly statuses = signal([
    { id: 'done', label: 'TERMINÉ', bg: '#dcfce7', color: '#166534', order: 3, countsAsCompleted: true },
  ]);
}

class FakeMilestonesStore {
  private _data = signal<MilestoneEntity[]>([]);

  readonly milestones = this._data.asReadonly();
  readonly loading = signal(false);
  readonly loaded = signal(true);

  seed(milestones: MilestoneEntity[]): void {
    this._data.set(milestones);
  }

  load(): Promise<void> {
    return Promise.resolve();
  }

  upsert(milestone: MilestoneEntity): Promise<MilestoneEntity> {
    this._data.update((list) => {
      const idx = list.findIndex((m) => m.id === milestone.id);
      if (idx === -1) return [...list, milestone];
      const copy = [...list];
      copy[idx] = milestone;
      return copy;
    });
    return Promise.resolve(milestone);
  }

  deleteById(id: number): Promise<void> {
    this._data.update((list) => list.filter((m) => m.id !== id));
    return Promise.resolve();
  }
}

describe('Issues', () => {
  let component: Issues;
  let fixture: ComponentFixture<Issues>;
  let store: FakeIssuesStore;
  let milestonesStore: FakeMilestonesStore;
  let statusesStore: FakeStatusesStore;
  let router: Router;

  beforeEach(async () => {
    store = new FakeIssuesStore();
    milestonesStore = new FakeMilestonesStore();
    statusesStore = new FakeStatusesStore();
    await TestBed.configureTestingModule({
      imports: [Issues],
      providers: [
        provideRouter([]),
        { provide: IssuesStore, useValue: store },
        { provide: MilestonesStore, useValue: milestonesStore },
        { provide: StatusesStore, useValue: statusesStore },
        { provide: ProjectContextService, useValue: { projectId: signal(1), project: signal(null) } },
      ],
    }).compileComponents();

    router = TestBed.inject(Router);
    fixture = TestBed.createComponent(Issues);
    component = fixture.componentInstance;
    await fixture.whenStable();
  });

  it('should create', () => {
    expect(component).toBeTruthy();
  });

  const mockEvent = { stopPropagation: () => {} } as unknown as Event;

  describe('filteredIssues', () => {
    it('returns all issues when no types are selected', () => {
      (component as any).selectedTypes = new Set();
      expect((component as any).filteredIssues.length).toBe(store.issues().length);
    });

    it('returns only issues matching the selected type', () => {
      (component as any).selectedTypes = new Set(['Bug']);
      const filtered: IssueEntity[] = (component as any).filteredIssues;
      expect(filtered.every((i) => i.type === 'Bug')).toBe(true);
    });

    it('returns empty array when no issues match the selected types', () => {
      (component as any).selectedTypes = new Set(['Epic']);
      const filtered: IssueEntity[] = (component as any).filteredIssues;
      expect(filtered.every((i) => i.type === 'Epic')).toBe(true);
    });

    it('returns issues matching any of multiple selected types', () => {
      (component as any).selectedTypes = new Set(['Bug', 'Story']);
      const filtered: IssueEntity[] = (component as any).filteredIssues;
      expect(filtered.every((i) => i.type === 'Bug' || i.type === 'Story')).toBe(true);
    });

    it('filters by status when selectedStatuses is set', () => {
      (component as any).selectedStatuses = new Set(['done']);
      const filtered: IssueEntity[] = (component as any).filteredIssues;
      expect(filtered.every((i) => i.status === 'done')).toBe(true);
    });

    it('filters by search query on issue name', () => {
      (component as any).searchQuery = 'Issue 1';
      const filtered: IssueEntity[] = (component as any).filteredIssues;
      expect(filtered.length).toBe(1);
      expect(filtered[0].name).toBe('Issue 1');
    });
  });

  describe('toggleType', () => {
    it('adds a type when not already selected', () => {
      (component as any).selectedTypes = new Set();
      (component as any).toggleType('Bug', mockEvent);
      expect((component as any).selectedTypes.has('Bug')).toBe(true);
    });

    it('removes a type when already selected (toggle off)', () => {
      (component as any).selectedTypes = new Set(['Bug']);
      (component as any).toggleType('Bug', mockEvent);
      expect((component as any).selectedTypes.has('Bug')).toBe(false);
    });

    it('can select multiple types simultaneously', () => {
      (component as any).selectedTypes = new Set();
      (component as any).toggleType('Bug', mockEvent);
      (component as any).toggleType('Story', mockEvent);
      expect((component as any).selectedTypes.size).toBe(2);
      expect((component as any).selectedTypes.has('Bug')).toBe(true);
      expect((component as any).selectedTypes.has('Story')).toBe(true);
    });
  });

  describe('clearTypes', () => {
    it('empties the type selection', () => {
      (component as any).selectedTypes = new Set(['Bug', 'Story']);
      (component as any).clearTypes(mockEvent);
      expect((component as any).selectedTypes.size).toBe(0);
    });
  });

  describe('toggleStatus', () => {
    it('adds a status when not already selected', () => {
      (component as any).selectedStatuses = new Set();
      (component as any).toggleStatus('done', mockEvent);
      expect((component as any).selectedStatuses.has('done')).toBe(true);
    });

    it('removes a status when already selected (toggle off)', () => {
      (component as any).selectedStatuses = new Set(['done']);
      (component as any).toggleStatus('done', mockEvent);
      expect((component as any).selectedStatuses.has('done')).toBe(false);
    });
  });

  describe('clearStatuses', () => {
    it('empties the status selection', () => {
      (component as any).selectedStatuses = new Set(['todo', 'done']);
      (component as any).clearStatuses(mockEvent);
      expect((component as any).selectedStatuses.size).toBe(0);
    });
  });

  describe('createIssue', () => {
    it('navigates to /projects/:pid/issues/new', () => {
      const spy = vi.spyOn(router, 'navigate').mockResolvedValue(true);
      (component as any).createIssue();
      expect(spy).toHaveBeenCalledWith(['/projects', 1, 'issues', 'new']);
    });
  });

  describe('openIssue', () => {
    it('navigates to the issue detail page', async () => {
      const spy = vi.spyOn(router, 'navigate').mockResolvedValue(true);
      (component as any).openIssue(42);
      expect(spy).toHaveBeenCalledWith(['/projects', 1, 'issues', 42]);
    });
  });

  describe('getProgress', () => {
    it('returns issue.progress for non-Epic types', () => {
      const issue = makeIssue({ type: 'Story', progress: 75 });
      expect((component as any).getProgress(issue)).toBe(75);
    });

    it('returns 0 for an Epic with no children', () => {
      const epic = makeIssue({ id: 50, type: 'Epic', name: 'Empty Epic', progress: 0 });
      store.upsert(epic);
      expect((component as any).getProgress(epic)).toBe(0);
    });

    it('returns 100 for an Epic where all children are done', () => {
      const epic = makeIssue({ id: 51, type: 'Epic', name: 'Full Epic', progress: 0 });
      store.upsert(epic);
      store.upsert(makeIssue({ id: 52, name: 'Child 1', epic: 'Full Epic', status: 'done' }));
      store.upsert(makeIssue({ id: 53, name: 'Child 2', epic: 'Full Epic', status: 'done' }));
      expect((component as any).getProgress(epic)).toBe(100);
    });

    it('calculates percentage for an Epic with some done children', () => {
      const epic = makeIssue({ id: 54, type: 'Epic', name: 'Partial Epic', progress: 0 });
      store.upsert(epic);
      store.upsert(makeIssue({ id: 55, name: 'Done', epic: 'Partial Epic', status: 'done' }));
      store.upsert(makeIssue({ id: 56, name: 'Pending', epic: 'Partial Epic', status: 'todo' }));
      expect((component as any).getProgress(epic)).toBe(50);
    });

    it('counts children by dependsOnIds as well as epic name', () => {
      const epic = makeIssue({ id: 57, type: 'Epic', name: 'Dep Epic', progress: 0 });
      store.upsert(epic);
      store.upsert(makeIssue({ id: 58, name: 'DepChild', dependsOnIds: [57], status: 'done' }));
      expect((component as any).getProgress(epic)).toBe(100);
    });

    it('counts a custom countsAsCompleted status as done for an Epic', () => {
      statusesStore.setCompleted(['done', 'abandoned']);
      const epic = makeIssue({ id: 60, type: 'Epic', name: 'Custom Epic', progress: 0 });
      store.upsert(epic);
      store.upsert(makeIssue({ id: 61, name: 'Done Child', epic: 'Custom Epic', status: 'abandoned' }));
      store.upsert(makeIssue({ id: 62, name: 'Todo Child', epic: 'Custom Epic', status: 'todo' }));
      expect((component as any).getProgress(epic)).toBe(50);
    });
  });

  describe('getMilestoneForIssue', () => {
    it('returns the milestone that contains the issue', () => {
      milestonesStore.seed([makeMilestone({ id: 10, name: 'Sprint A', issueIds: [1] })]);
      const m = (component as any).getMilestoneForIssue(1);
      expect(m?.id).toBe(10);
    });

    it('returns undefined when no milestone contains the issue', () => {
      milestonesStore.seed([makeMilestone({ id: 10, name: 'Sprint A', issueIds: [99] })]);
      expect((component as any).getMilestoneForIssue(1)).toBeUndefined();
    });
  });

  describe('filteredIssues — milestone filter', () => {
    beforeEach(() => {
      milestonesStore.seed([
        makeMilestone({ id: 10, name: 'Sprint A', issueIds: [1] }),
        makeMilestone({ id: 20, name: 'Sprint B', issueIds: [2] }),
      ]);
    });

    it('shows all issues when no milestone filter is active', () => {
      expect((component as any).filteredIssues.length).toBe(3);
    });

    it('shows only issues of the selected milestone', () => {
      (component as any).selectedMilestoneIds = new Set([10]);
      const filtered: IssueEntity[] = (component as any).filteredIssues;
      expect(filtered.length).toBe(1);
      expect(filtered[0].id).toBe(1);
    });

    it('shows issues from multiple selected milestones', () => {
      (component as any).selectedMilestoneIds = new Set([10, 20]);
      const filtered: IssueEntity[] = (component as any).filteredIssues;
      expect(filtered.map((i) => i.id).sort()).toEqual([1, 2]);
    });

    it('shows only issues without milestone when showNoMilestone is true', () => {
      (component as any).showNoMilestone = true;
      const filtered: IssueEntity[] = (component as any).filteredIssues;
      expect(filtered.length).toBe(1);
      expect(filtered[0].id).toBe(3);
    });

    it('combines milestone selection and no-milestone option as OR', () => {
      (component as any).selectedMilestoneIds = new Set([10]);
      (component as any).showNoMilestone = true;
      const filtered: IssueEntity[] = (component as any).filteredIssues;
      expect(filtered.map((i) => i.id).sort()).toEqual([1, 3]);
    });
  });

  describe('toggleMilestone', () => {
    it('adds a milestone id when not already selected', () => {
      (component as any).toggleMilestone(10, mockEvent);
      expect((component as any).selectedMilestoneIds.has(10)).toBe(true);
    });

    it('removes a milestone id when already selected', () => {
      (component as any).selectedMilestoneIds = new Set([10]);
      (component as any).toggleMilestone(10, mockEvent);
      expect((component as any).selectedMilestoneIds.has(10)).toBe(false);
    });
  });

  describe('toggleNoMilestone', () => {
    it('sets showNoMilestone to true when false', () => {
      (component as any).showNoMilestone = false;
      (component as any).toggleNoMilestone(mockEvent);
      expect((component as any).showNoMilestone).toBe(true);
    });

    it('sets showNoMilestone to false when true', () => {
      (component as any).showNoMilestone = true;
      (component as any).toggleNoMilestone(mockEvent);
      expect((component as any).showNoMilestone).toBe(false);
    });
  });

  describe('clearMilestones', () => {
    it('clears selected milestone ids and showNoMilestone', () => {
      (component as any).selectedMilestoneIds = new Set([10, 20]);
      (component as any).showNoMilestone = true;
      (component as any).clearMilestones(mockEvent);
      expect((component as any).selectedMilestoneIds.size).toBe(0);
      expect((component as any).showNoMilestone).toBe(false);
    });
  });

  describe('milestoneDropdownLabel', () => {
    it('returns "Milestone" when nothing is selected', () => {
      expect((component as any).milestoneDropdownLabel()).toBe('Milestone');
    });

    it('returns "Sans milestone" when only showNoMilestone is true', () => {
      (component as any).showNoMilestone = true;
      expect((component as any).milestoneDropdownLabel()).toBe('Sans milestone');
    });

    it('returns the milestone name when exactly one milestone is selected', () => {
      milestonesStore.seed([makeMilestone({ id: 10, name: 'Sprint A', issueIds: [] })]);
      (component as any).selectedMilestoneIds = new Set([10]);
      expect((component as any).milestoneDropdownLabel()).toBe('Sprint A');
    });

    it('returns a count when multiple filters are active', () => {
      milestonesStore.seed([
        makeMilestone({ id: 10, name: 'Sprint A', issueIds: [] }),
        makeMilestone({ id: 20, name: 'Sprint B', issueIds: [] }),
      ]);
      (component as any).selectedMilestoneIds = new Set([10, 20]);
      expect((component as any).milestoneDropdownLabel()).toBe('Milestone (2)');
    });
  });

  describe('milestoneFilterActive', () => {
    it('is false when nothing is selected', () => {
      expect((component as any).milestoneFilterActive).toBe(false);
    });

    it('is true when a milestone id is selected', () => {
      (component as any).selectedMilestoneIds = new Set([10]);
      expect((component as any).milestoneFilterActive).toBe(true);
    });

    it('is true when showNoMilestone is true', () => {
      (component as any).showNoMilestone = true;
      expect((component as any).milestoneFilterActive).toBe(true);
    });
  });

  describe('typeBadgeClass', () => {
    it('maps Bug to text-bg-danger', () => {
      expect((component as any).typeBadgeClass('Bug')).toBe('text-bg-danger');
    });

    it('maps Study to text-bg-secondary', () => {
      expect((component as any).typeBadgeClass('Study')).toBe('text-bg-secondary');
    });

    it('maps Story to text-bg-success', () => {
      expect((component as any).typeBadgeClass('Story')).toBe('text-bg-success');
    });

    it('maps Task to text-bg-primary', () => {
      expect((component as any).typeBadgeClass('Task')).toBe('text-bg-primary');
    });

    it('maps Technical Story to text-bg-warning', () => {
      expect((component as any).typeBadgeClass('Technical Story')).toBe('text-bg-warning');
    });

    it('maps Epic to text-bg-info', () => {
      expect((component as any).typeBadgeClass('Epic')).toBe('text-bg-info');
    });
  });
});