import assert from 'node:assert';
import path from 'node:path';
import { lodash, winPath } from '@fesjs/utils';

interface SpecifierObject {
    local: string;
    exported: string;
}

type Specifier = string | SpecifierObject;

interface Item {
    source: string;
    exportAll?: boolean;
    specifiers?: Specifier[];
}

interface GenerateExportsOptions {
    item: Item;
    fesExportsHook: Record<string, boolean>;
}

const reserveLibrarys = ['fes']; // reserve library
// todo 插件导出内容冲突问题待解决
const reserveExportsNames = ['Link', 'NavLink', 'Redirect', 'dynamic', 'withRouter', 'Route'];

export default function generateExports(basePath: string, { item, fesExportsHook }: GenerateExportsOptions): string {
    assert(item.source, 'source should be supplied.');
    const source = path.relative(path.basename(basePath), item.source);
    assert(item.exportAll || item.specifiers, 'exportAll or specifiers should be supplied.');
    assert(!reserveLibrarys.includes(source), `${source} is reserve library, Please don't use it.`);
    if (item.exportAll) {
        return `export * from '${winPath(source)}';`;
    }
    assert(Array.isArray(item.specifiers), `specifiers should be Array, but got ${item.specifiers?.toString()}.`);
    const specifiersStrArr = item.specifiers!.map((specifier) => {
        if (typeof specifier === 'string') {
            assert(!reserveExportsNames.includes(specifier), `${specifier} is reserve name, you can use 'exported' to set alias.`);
            assert(!fesExportsHook[specifier], `${specifier} is Defined, you can use 'exported' to set alias.`);
            fesExportsHook[specifier] = true;
            return specifier;
        }
        assert(lodash.isPlainObject(specifier), `Configure item context should be Plain Object, but got ${specifier}.`);
        assert((specifier as SpecifierObject).local && (specifier as SpecifierObject).exported, 'local and exported should be supplied.');
        return `${(specifier as SpecifierObject).local} as ${(specifier as SpecifierObject).exported}`;
    });
    return `export { ${specifiersStrArr.join(', ')} } from '${winPath(source)}';`;
}