# All files / src/db/repositories/drizzle phase.ts

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     /**
     * Drizzle Phase Repository Adapter
     *
     * Implements PhaseRepository interface using Drizzle ORM.
     */

    import { eq, asc, and } from 'drizzle-orm';
    import { nanoid } from 'nanoid';
    import type { DrizzleDatabase } from '../../index.js';
    import { phases, phaseDependencies, type Phase } from '../../schema.js';
    import type {
      PhaseRepository,
      CreatePhaseData,
      UpdatePhaseData,
    } from '../phase-repository.js';

    /**
     * Drizzle adapter for PhaseRepository.
     *
     * Uses dependency injection for database instance,
     * enabling isolated test databases.
     */
    export class DrizzlePhaseRepository implements PhaseRepository {
      constructor(private db: DrizzleDatabase) {}

      async create(data: CreatePhaseData): Promise<Phase> {
        const { id: providedId, ...rest } = data;
        const id = providedId ?? nanoid();
        const now = new Date();

        const [created] = await this.db.insert(phases).values({
          id,
          ...rest,
          status: data.status ?? 'pending',
          createdAt: now,
          updatedAt: now,
        }).returning();

        return created;
      }

      async findById(id: string): Promise<Phase | null> {
        const result = await this.db
          .select()
          .from(phases)
          .where(eq(phases.id, id))
          .limit(1);

        return result[0] ?? null;
      }

      async findByInitiativeId(initiativeId: string): Promise<Phase[]> {
        return this.db
          .select()
          .from(phases)
          .where(eq(phases.initiativeId, initiativeId))
          .orderBy(asc(phases.createdAt));
      }

      async findDependenciesByInitiativeId(initiativeId: string): Promise<Array<{ phaseId: string; dependsOnPhaseId: string }>> {
        return this.db
          .select({ phaseId: phaseDependencies.phaseId, dependsOnPhaseId: phaseDependencies.dependsOnPhaseId })
          .from(phaseDependencies)
          .innerJoin(phases, eq(phaseDependencies.phaseId, phases.id))
          .where(eq(phases.initiativeId, initiativeId));
      }

      async update(id: string, data: UpdatePhaseData): Promise<Phase> {
        const [updated] = await this.db
          .update(phases)
          .set({ ...data, updatedAt: new Date() })
          .where(eq(phases.id, id))
          .returning();

        if (!updated) {
          throw new Error(`Phase not found: ${id}`);
        }

        return updated;
      }

      async delete(id: string): Promise<void> {
        const [deleted] = await this.db.delete(phases).where(eq(phases.id, id)).returning();

        if (!deleted) {
          throw new Error(`Phase not found: ${id}`);
        }
      }

      async createDependency(phaseId: string, dependsOnPhaseId: string): Promise<void> {
        const id = nanoid();
        const now = new Date();

        await this.db.insert(phaseDependencies).values({
          id,
          phaseId,
          dependsOnPhaseId,
          createdAt: now,
        });
      }

      async getDependencies(phaseId: string): Promise<string[]> {
        const result = await this.db
          .select({ dependsOnPhaseId: phaseDependencies.dependsOnPhaseId })
          .from(phaseDependencies)
          .where(eq(phaseDependencies.phaseId, phaseId));

        return result.map((row) => row.dependsOnPhaseId);
      }

      async getDependents(phaseId: string): Promise<string[]> {
        const result = await this.db
          .select({ phaseId: phaseDependencies.phaseId })
          .from(phaseDependencies)
          .where(eq(phaseDependencies.dependsOnPhaseId, phaseId));

        return result.map((row) => row.phaseId);
      }

      async removeDependency(phaseId: string, dependsOnPhaseId: string): Promise<void> {
        await this.db
          .delete(phaseDependencies)
          .where(
            and(
              eq(phaseDependencies.phaseId, phaseId),
              eq(phaseDependencies.dependsOnPhaseId, dependsOnPhaseId),
            ),
          );
      }
    }