session.ts

import type { OPSQLiteConnection, QueryResult } from '@op-engineering/op-sqlite';
import { entityKind } from '~/entity.ts';
import type { Logger } from '~/logger.ts';
import { NoopLogger } from '~/logger.ts';
import type { RelationalSchemaConfig, TablesRelationalConfig } from '~/relations.ts';
import { fillPlaceholders, type Query, sql } from '~/sql/sql.ts';
import type { SQLiteAsyncDialect } from '~/sqlite-core/dialect.ts';
import { SQLiteTransaction } from '~/sqlite-core/index.ts';
import type { SelectedFieldsOrdered } from '~/sqlite-core/query-builders/select.types.ts';
import {
	type PreparedQueryConfig as PreparedQueryConfigBase,
	type SQLiteExecuteMethod,
	SQLitePreparedQuery,
	SQLiteSession,
	type SQLiteTransactionConfig,
} from '~/sqlite-core/session.ts';
import { mapResultRow } from '~/utils.ts';

export interface OPSQLiteSessionOptions {
	logger?: Logger;
}

type PreparedQueryConfig = Omit<PreparedQueryConfigBase, 'statement' | 'run'>;

export class OPSQLiteSession<
	TFullSchema extends Record<string, unknown>,
	TSchema extends TablesRelationalConfig,
> extends SQLiteSession<'async', QueryResult, TFullSchema, TSchema> {
	static readonly [entityKind]: string = 'OPSQLiteSession';

	private logger: Logger;

	constructor(
		private client: OPSQLiteConnection,
		dialect: SQLiteAsyncDialect,
		private schema: RelationalSchemaConfig<TSchema> | undefined,
		options: OPSQLiteSessionOptions = {},
	) {
		super(dialect);
		this.logger = options.logger ?? new NoopLogger();
	}

	prepareQuery<T extends Omit<PreparedQueryConfig, 'run'>>(
		query: Query,
		fields: SelectedFieldsOrdered | undefined,
		executeMethod: SQLiteExecuteMethod,
		isResponseInArrayMode: boolean,
		customResultMapper?: (rows: unknown[][]) => unknown,
	): OPSQLitePreparedQuery<T> {
		return new OPSQLitePreparedQuery(
			this.client,
			query,
			this.logger,
			fields,
			executeMethod,
			isResponseInArrayMode,
			customResultMapper,
		);
	}

	override transaction<T>(
		transaction: (tx: OPSQLiteTransaction<TFullSchema, TSchema>) => T,
		config: SQLiteTransactionConfig = {},
	): T {
		const tx = new OPSQLiteTransaction('async', this.dialect, this, this.schema);
		this.run(sql.raw(`begin${config?.behavior ? ' ' + config.behavior : ''}`));
		try {
			const result = transaction(tx);
			this.run(sql`commit`);
			return result;
		} catch (err) {
			this.run(sql`rollback`);
			throw err;
		}
	}
}

export class OPSQLiteTransaction<
	TFullSchema extends Record<string, unknown>,
	TSchema extends TablesRelationalConfig,
> extends SQLiteTransaction<'async', QueryResult, TFullSchema, TSchema> {
	static readonly [entityKind]: string = 'OPSQLiteTransaction';

	override transaction<T>(transaction: (tx: OPSQLiteTransaction<TFullSchema, TSchema>) => T): T {
		const savepointName = `sp${this.nestedIndex}`;
		const tx = new OPSQLiteTransaction('async', this.dialect, this.session, this.schema, this.nestedIndex + 1);
		this.session.run(sql.raw(`savepoint ${savepointName}`));
		try {
			const result = transaction(tx);
			this.session.run(sql.raw(`release savepoint ${savepointName}`));
			return result;
		} catch (err) {
			this.session.run(sql.raw(`rollback to savepoint ${savepointName}`));
			throw err;
		}
	}
}

export class OPSQLitePreparedQuery<T extends PreparedQueryConfig = PreparedQueryConfig> extends SQLitePreparedQuery<
	{ type: 'async'; run: QueryResult; all: T['all']; get: T['get']; values: T['values']; execute: T['execute'] }
> {
	static readonly [entityKind]: string = 'OPSQLitePreparedQuery';

	constructor(
		private client: OPSQLiteConnection,
		query: Query,
		private logger: Logger,
		private fields: SelectedFieldsOrdered | undefined,
		executeMethod: SQLiteExecuteMethod,
		private _isResponseInArrayMode: boolean,
		private customResultMapper?: (rows: unknown[][]) => unknown,
	) {
		super('sync', executeMethod, query);
	}

	run(placeholderValues?: Record<string, unknown>): Promise<QueryResult> {
		const params = fillPlaceholders(this.query.params, placeholderValues ?? {});
		this.logger.logQuery(this.query.sql, params);

		return this.client.executeAsync(this.query.sql, params);
	}

	async all(placeholderValues?: Record<string, unknown>): Promise<T['all']> {
		const { fields, joinsNotNullableMap, query, logger, customResultMapper, client } = this;
		if (!fields && !customResultMapper) {
			const params = fillPlaceholders(query.params, placeholderValues ?? {});
			logger.logQuery(query.sql, params);

			return client.execute(query.sql, params).rows?._array || [];
		}

		const rows = await this.values(placeholderValues) as unknown[][];
		if (customResultMapper) {
			return customResultMapper(rows) as T['all'];
		}
		return rows.map((row) => mapResultRow(fields!, row, joinsNotNullableMap));
	}

	async get(placeholderValues?: Record<string, unknown>): Promise<T['get']> {
		const { fields, joinsNotNullableMap, customResultMapper, query, logger, client } = this;
		const params = fillPlaceholders(query.params, placeholderValues ?? {});
		logger.logQuery(query.sql, params);
		if (!fields && !customResultMapper) {
			const rows = client.execute(query.sql, params).rows?._array || [];
			return rows[0];
		}

		const rows = await this.values(placeholderValues) as unknown[][];
		const row = rows[0];

		if (!row) {
			return undefined;
		}

		if (customResultMapper) {
			return customResultMapper(rows) as T['get'];
		}

		return mapResultRow(fields!, row, joinsNotNullableMap);
	}

	values(placeholderValues?: Record<string, unknown>): Promise<T['values']> {
		const params = fillPlaceholders(this.query.params, placeholderValues ?? {});
		this.logger.logQuery(this.query.sql, params);
		return this.client.executeRawAsync(this.query.sql, params);
	}

	/** @internal */
	isResponseInArrayMode(): boolean {
		return this._isResponseInArrayMode;
	}
}