/**
 * Converts various boolean-like values (0/1, '0'/'1', true/false) to strict boolean.
 */
export function coerceToBoolean(value: unknown): boolean {
	if (typeof value === 'boolean') return value;
	if (value === 1 || value === '1') return true;
	if (value === 0 || value === '0') return false;
	if (typeof value === 'string') {
		if (value.toLowerCase() === 'true') return true;
		if (value.toLowerCase() === 'false') return false;
	}
	return Boolean(value);
}

/**
 * Coerces string numbers to actual numbers for v2 API.
 */
export function coerceToNumber(value: unknown): number {
	if (typeof value === 'number') return value;
	const num = Number(value);
	if (Number.isNaN(num)) {
		throw new Error(`Cannot convert "${value}" to a number`);
	}
	return num;
}

/**
 * Converts a date/datetime string to RFC 3339 format for v2 API.
 * v1 uses 'YYYY-MM-DD HH:mm:ss', v2 requires '2024-01-01T00:00:00Z'.
 * Date-only strings (YYYY-MM-DD) are passed through unchanged.
 */
export function toRfc3339(value: string): string {
	if (!value || value.includes('T')) return value;
	// Date-only (YYYY-MM-DD) — pass through, Pipedrive accepts this
	if (/^\d{4}-\d{2}-\d{2}$/.test(value)) return value;
	// Datetime without T — convert
	const date = new Date(value.replace(' ', 'T') + 'Z');
	if (Number.isNaN(date.getTime())) return value;
	return date.toISOString();
}

/**
 * Reduces any supported date/datetime input to a YYYY-MM-DD string for
 * Pipedrive fields that only accept a calendar date (e.g. deal
 * `expected_close_date`, activity `due_date`). The dateTime widget emits
 * ISO 8601 strings with a time component, which Pipedrive rejects for
 * these fields.
 *
 * Inputs that don't match the expected shapes are returned verbatim so
 * Pipedrive can surface the real validation error — we deliberately avoid
 * `new Date(value).toISOString()` here because that converts through UTC
 * and can shift the calendar day for timezone-less inputs parsed in a
 * non-UTC server timezone.
 */
export function toDateOnly(value: string): string {
	if (!value) return value;
	if (/^\d{4}-\d{2}-\d{2}$/.test(value)) return value;
	const datePart = value.split('T')[0].split(' ')[0];
	if (/^\d{4}-\d{2}-\d{2}$/.test(datePart)) return datePart;
	return value;
}