import type { SurrealClientView } from "../../src/types/adapter.js";

/**
 * In-memory `SurrealClientView` used by unit tests. Records every call.
 *
 * Lives under `src/` (not `tests/`) so coverage configs that exclude
 * `tests/**` still account for usage — but it is intentionally never
 * referenced by production exports (the root barrel never re-exports it),
 * so consumers do not see it.
 */
/**
 * The adapter rewrites named placeholders into positional `$pN` and passes
 * params as a positional array. FakeClient reconstructs a named record
 * keyed by `pN` so unit tests can inspect bound values predictably.
 */
export class FakeClient implements SurrealClientView {
    public isConnected = true;
    public log: Array<{
        sql: string;
        params: readonly unknown[];
        vars: Record<string, unknown>;
    }> = [];
    protected readonly queryHandler: (
        sql: string,
        vars: Record<string, unknown>
    ) => Record<string, unknown>[];

    public constructor(
        handler: (
            sql: string,
            vars: Record<string, unknown>
        ) => Record<string, unknown>[] = () => []
    ) {
        this.queryHandler = handler;
    }

    public async query<T = Record<string, unknown>>(
        sql: string,
        params?: readonly unknown[]
    ): Promise<T[]> {
        const arr = params ?? [];
        const vars: Record<string, unknown> = {};
        for (let i = 0; i < arr.length; i++) {
            vars[`p${i}`] = arr[i];
        }
        this.log.push({ sql, params: arr, vars });
        return this.queryHandler(sql, vars) as T[];
    }

    public async execute(sql: string): Promise<{ rowsAffected: number }> {
        this.log.push({ sql, params: [], vars: {} });
        return { rowsAffected: 0 };
    }
}