// Auto-generated Approval service
import { queryAll, queryOne, execute } from "../db/client.js";
import type { Approval, CreateApprovalInput, UpdateApprovalInput } from "../types/index.js";

export class ApprovalService {
  /** List all approvals */
  list(): Approval[] {
    return queryAll<Approval>("SELECT * FROM approvals ORDER BY created_at DESC");
  }

  /** Get by ID */
  getById(id: string): Approval | undefined {
    return queryOne<Approval>("SELECT * FROM approvals WHERE id = ?", [id]);
  }

  /** Create */
  create(input: CreateApprovalInput): Approval {
    const id = crypto.randomUUID();
    const now = new Date().toISOString();
    const cols = ["id", "user_id", "entity_type", "entity_id", "applicant_id", "status", "form_data", "created_at", "updated_at"];
    const values = [id, input.userId ?? null, input.entityType ?? null, input.entityId ?? null, input.applicantId ?? null, input.status ?? null, input.formData ?? null, now, now];

    execute(`INSERT INTO approvals (${cols.join(", ")}) VALUES (?, ?, ?, ?, ?, ?, ?, ?, ?)`, values);
    return this.getById(id)!;
  }

  /** Update */
  update(id: string, input: UpdateApprovalInput): Approval | undefined {
    const existing = this.getById(id);
    if (!existing) return undefined;

    const sets: string[] = [];
    const values: unknown[] = [];
    if (input.userId !== undefined) { sets.push("user_id = ?"); values.push(input.userId); }
    if (input.entityType !== undefined) { sets.push("entity_type = ?"); values.push(input.entityType); }
    if (input.entityId !== undefined) { sets.push("entity_id = ?"); values.push(input.entityId); }
    if (input.applicantId !== undefined) { sets.push("applicant_id = ?"); values.push(input.applicantId); }
    if (input.status !== undefined) { sets.push("status = ?"); values.push(input.status); }
    if (input.formData !== undefined) { sets.push("form_data = ?"); values.push(input.formData); }

    if (sets.length === 0) return existing;

    sets.push("updated_at = ?");
    values.push(new Date().toISOString());

    values.push(id);
    execute(`UPDATE approvals SET ${sets.join(", ")} WHERE id = ?`, values);
    return this.getById(id)!;
  }

  /** Delete */
  delete(id: string): boolean {
    const result = execute("DELETE FROM approvals WHERE id = ?", [id]);
    return result.changes > 0;
  }
}