// Copyright 2018-2024 the Deno authors. All rights reserved. MIT license.
// This module is browser compatible.
import * as dntShim from "../../../../../../_dnt.shims.js";
import { normalizeString } from "../_common/normalize_string.js";
import { assertPath } from "../_common/assert_path.js";
import { isPosixPathSeparator } from "./_util.js";
/**
 * Resolves path segments into a `path`.
 *
 * @example Usage
 * ```ts
 * import { resolve } from "@std/path/posix/resolve";
 * import { assertEquals } from "@std/assert";
 *
 * const path = resolve("/foo", "bar", "baz/asdf", "quux", "..");
 * assertEquals(path, "/foo/bar/baz/asdf");
 * ```
 *
 * @param pathSegments The path segments to resolve.
 * @returns The resolved path.
 */
export function resolve(...pathSegments) {
    let resolvedPath = "";
    let resolvedAbsolute = false;
    for (let i = pathSegments.length - 1; i >= -1 && !resolvedAbsolute; i--) {
        let path;
        if (i >= 0)
            path = pathSegments[i];
        else {
            // deno-lint-ignore no-explicit-any
            const { Deno } = dntShim.dntGlobalThis;
            if (typeof Deno?.cwd !== "function") {
                throw new TypeError("Resolved a relative path without a current working directory (CWD)");
            }
            path = Deno.cwd();
        }
        assertPath(path);
        // Skip empty entries
        if (path.length === 0) {
            continue;
        }
        resolvedPath = `${path}/${resolvedPath}`;
        resolvedAbsolute = isPosixPathSeparator(path.charCodeAt(0));
    }
    // At this point the path should be resolved to a full absolute path, but
    // handle relative paths to be safe (might happen when Deno.cwd() fails)
    // Normalize the path
    resolvedPath = normalizeString(resolvedPath, !resolvedAbsolute, "/", isPosixPathSeparator);
    if (resolvedAbsolute) {
        if (resolvedPath.length > 0)
            return `/${resolvedPath}`;
        else
            return "/";
    }
    else if (resolvedPath.length > 0)
        return resolvedPath;
    else
        return ".";
}
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