// Auto-generated Contract service
import { queryAll, queryOne, execute } from "../db/client.js";
import type { Contract, CreateContractInput, UpdateContractInput } from "../types/index.js";

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

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

  /** Create */
  create(input: CreateContractInput): Contract {
    const id = crypto.randomUUID();
    const now = new Date().toISOString();
    const cols = ["id", "user_id", "title", "party_a", "party_b", "amount", "signed_at", "expires_at", "status", "file_url", "created_at", "updated_at"];
    const values = [id, input.userId ?? null, input.title ?? null, input.partyA ?? null, input.partyB ?? null, input.amount ?? null, input.signedAt ?? null, input.expiresAt ?? null, input.status ?? null, input.fileUrl ?? null, now, now];

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

  /** Update */
  update(id: string, input: UpdateContractInput): Contract | 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.title !== undefined) { sets.push("title = ?"); values.push(input.title); }
    if (input.partyA !== undefined) { sets.push("party_a = ?"); values.push(input.partyA); }
    if (input.partyB !== undefined) { sets.push("party_b = ?"); values.push(input.partyB); }
    if (input.amount !== undefined) { sets.push("amount = ?"); values.push(input.amount); }
    if (input.signedAt !== undefined) { sets.push("signed_at = ?"); values.push(input.signedAt); }
    if (input.expiresAt !== undefined) { sets.push("expires_at = ?"); values.push(input.expiresAt); }
    if (input.status !== undefined) { sets.push("status = ?"); values.push(input.status); }
    if (input.fileUrl !== undefined) { sets.push("file_url = ?"); values.push(input.fileUrl); }

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

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

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

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