import * as path from 'path';
import * as pathHelper from './internal-path-helper.js';
import assert from 'assert';
const IS_WINDOWS = process.platform === 'win32';
/**
 * Helper class for parsing paths into segments
 */
export class Path {
    /**
     * Constructs a Path
     * @param itemPath Path or array of segments
     */
    constructor(itemPath) {
        this.segments = [];
        // String
        if (typeof itemPath === 'string') {
            assert(itemPath, `Parameter 'itemPath' must not be empty`);
            // Normalize slashes and trim unnecessary trailing slash
            itemPath = pathHelper.safeTrimTrailingSeparator(itemPath);
            // Not rooted
            if (!pathHelper.hasRoot(itemPath)) {
                this.segments = itemPath.split(path.sep);
            }
            // Rooted
            else {
                // Add all segments, while not at the root
                let remaining = itemPath;
                let dir = pathHelper.dirname(remaining);
                while (dir !== remaining) {
                    // Add the segment
                    const basename = path.basename(remaining);
                    this.segments.unshift(basename);
                    // Truncate the last segment
                    remaining = dir;
                    dir = pathHelper.dirname(remaining);
                }
                // Remainder is the root
                this.segments.unshift(remaining);
            }
        }
        // Array
        else {
            // Must not be empty
            assert(itemPath.length > 0, `Parameter 'itemPath' must not be an empty array`);
            // Each segment
            for (let i = 0; i < itemPath.length; i++) {
                let segment = itemPath[i];
                // Must not be empty
                assert(segment, `Parameter 'itemPath' must not contain any empty segments`);
                // Normalize slashes
                segment = pathHelper.normalizeSeparators(itemPath[i]);
                // Root segment
                if (i === 0 && pathHelper.hasRoot(segment)) {
                    segment = pathHelper.safeTrimTrailingSeparator(segment);
                    assert(segment === pathHelper.dirname(segment), `Parameter 'itemPath' root segment contains information for multiple segments`);
                    this.segments.push(segment);
                }
                // All other segments
                else {
                    // Must not contain slash
                    assert(!segment.includes(path.sep), `Parameter 'itemPath' contains unexpected path separators`);
                    this.segments.push(segment);
                }
            }
        }
    }
    /**
     * Converts the path to it's string representation
     */
    toString() {
        // First segment
        let result = this.segments[0];
        // All others
        let skipSlash = result.endsWith(path.sep) || (IS_WINDOWS && /^[A-Z]:$/i.test(result));
        for (let i = 1; i < this.segments.length; i++) {
            if (skipSlash) {
                skipSlash = false;
            }
            else {
                result += path.sep;
            }
            result += this.segments[i];
        }
        return result;
    }
}
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