init

src/use-cases/task/models/step.ts

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+import type { Stepable } from '@/use-cases/task/interfaces/stepable'
+
+export class Step implements Stepable {
+  private _steps: Step[] = []
+
+  constructor(
+    readonly id: string,
+    readonly title: string,
+    readonly estimation?: number
+  ) {
+    return this
+  }
+
+  public get steps() {
+    return this._steps
+  }
+
+  public addSteps(...steps: Stepable[]) {
+    this._steps.push(...Step.fromStepable(...steps))
+    return this
+  }
+
+  public removeStep(index: number) {
+    if (index < 0 || index >= this._steps.length) {
+      return
+    }
+
+    this._steps.splice(index)
+  }
+
+  public get totalEstimation(): number {
+    return (
+      this.estimation ??
+      this._steps.reduce((acc, step) => acc + step.totalEstimation, 0)
+    )
+  }
+
+  public static fromStepable(...stepables: Stepable[]): Step[] {
+    return stepables.map((stepable) =>
+      new Step(stepable.id, stepable.title, stepable.estimation).addSteps(
+        ...Step.fromStepable(...stepable.steps)
+      )
+    )
+  }
+
+  public static getStepLeafs(steps: Stepable[]): Stepable[] {
+    return steps.flatMap((step) =>
+      step.steps.length > 0 ? Step.getStepLeafs(step.steps) : [step]
+    )
+  }
+}