// This file is auto-generated by @hey-api/openapi-ts

type Slot = "body" | "headers" | "path" | "query";

export type Field =
	| {
			in: Exclude<Slot, "body">;
			/**
			 * Field name. This is the name we want the user to see and use.
			 */
			key: string;
			/**
			 * Field mapped name. This is the name we want to use in the request.
			 * If omitted, we use the same value as `key`.
			 */
			map?: string;
	  }
	| {
			in: Extract<Slot, "body">;
			/**
			 * Key isn't required for bodies.
			 */
			key?: string;
			map?: string;
	  }
	| {
			/**
			 * Field name. This is the name we want the user to see and use.
			 */
			key: string;
			/**
			 * Field mapped name. This is the name we want to use in the request.
			 * If `in` is omitted, `map` aliases `key` to the transport layer.
			 */
			map: Slot;
	  };

export interface Fields {
	allowExtra?: Partial<Record<Slot, boolean>>;
	args?: ReadonlyArray<Field>;
}

export type FieldsConfig = ReadonlyArray<Field | Fields>;

const extraPrefixesMap: Record<string, Slot> = {
	$body_: "body",
	$headers_: "headers",
	$path_: "path",
	$query_: "query",
};
const extraPrefixes = Object.entries(extraPrefixesMap);

type KeyMap = Map<
	string,
	| {
			in: Slot;
			map?: string;
	  }
	| {
			in?: never;
			map: Slot;
	  }
>;

const buildKeyMap = (fields: FieldsConfig, map?: KeyMap): KeyMap => {
	if (!map) {
		map = new Map();
	}

	for (const config of fields) {
		if ("in" in config) {
			if (config.key) {
				map.set(config.key, {
					in: config.in,
					map: config.map,
				});
			}
		} else if ("key" in config) {
			map.set(config.key, {
				map: config.map,
			});
		} else if (config.args) {
			buildKeyMap(config.args, map);
		}
	}

	return map;
};

interface Params {
	body: unknown;
	headers: Record<string, unknown>;
	path: Record<string, unknown>;
	query: Record<string, unknown>;
}

const stripEmptySlots = (params: Params) => {
	for (const [slot, value] of Object.entries(params)) {
		if (value && typeof value === "object" && !Object.keys(value).length) {
			delete params[slot as Slot];
		}
	}
};

export const buildClientParams = (args: ReadonlyArray<unknown>, fields: FieldsConfig) => {
	const params: Params = {
		body: {},
		headers: {},
		path: {},
		query: {},
	};

	const map = buildKeyMap(fields);

	let config: FieldsConfig[number] | undefined;

	for (const [index, arg] of args.entries()) {
		if (fields[index]) {
			config = fields[index];
		}

		if (!config) {
			continue;
		}

		if ("in" in config) {
			if (config.key) {
				const field = map.get(config.key)!;
				const name = field.map || config.key;
				if (field.in) {
					(params[field.in] as Record<string, unknown>)[name] = arg;
				}
			} else {
				params.body = arg;
			}
		} else {
			for (const [key, value] of Object.entries(arg ?? {})) {
				const field = map.get(key);

				if (field) {
					if (field.in) {
						const name = field.map || key;
						(params[field.in] as Record<string, unknown>)[name] = value;
					} else {
						params[field.map] = value;
					}
				} else {
					const extra = extraPrefixes.find(([prefix]) => key.startsWith(prefix));

					if (extra) {
						const [prefix, slot] = extra;
						(params[slot] as Record<string, unknown>)[key.slice(prefix.length)] = value;
					} else if ("allowExtra" in config && config.allowExtra) {
						for (const [slot, allowed] of Object.entries(config.allowExtra)) {
							if (allowed) {
								(params[slot as Slot] as Record<string, unknown>)[key] = value;
								break;
							}
						}
					}
				}
			}
		}
	}

	stripEmptySlots(params);

	return params;
};