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package com.oracle.js.parser;

import java.util.ArrayList;
import java.util.List;

import org.graalvm.collections.EconomicMap;
import org.graalvm.collections.EconomicSet;

import com.oracle.js.parser.ir.ExportNode;
import com.oracle.js.parser.ir.ExportSpecifierNode;
import com.oracle.js.parser.ir.ImportNode;
import com.oracle.js.parser.ir.Module;
import com.oracle.js.parser.ir.Module.ExportEntry;
import com.oracle.js.parser.ir.Module.ImportEntry;
import com.oracle.js.parser.ir.Scope;

ParserContextNode that represents a module.
/**
 * ParserContextNode that represents a module.
 */
class ParserContextModuleNode extends ParserContextBaseNode {

    
Module name. /** Module name. */
    private final String name;
    private final Scope moduleScope;
    private final AbstractParser parser;

    private List<String> requestedModules = new ArrayList<>();
    private List<ImportEntry> importEntries = new ArrayList<>();
    private List<ExportEntry> localExportEntries = new ArrayList<>();
    private List<ExportEntry> indirectExportEntries = new ArrayList<>();
    private List<ExportEntry> starExportEntries = new ArrayList<>();

    private List<ImportNode> imports = new ArrayList<>();
    private List<ExportNode> exports = new ArrayList<>();

    private EconomicMap<String, ImportEntry> importedLocalNames = EconomicMap.create();
    private EconomicSet<String> exportedNames = EconomicSet.create();

    
Constructor.
Params:
name – name of the module/**
     * Constructor.
     *
     * @param name name of the module
     */
    ParserContextModuleNode(final String name, Scope moduleScope, AbstractParser parser) {
        this.name = name;
        this.moduleScope = moduleScope;
        this.parser = parser;
    }

    
Returns the name of the module.
Returns:
name of the module/**
     * Returns the name of the module.
     *
     * @return name of the module
     */
    public String getModuleName() {
        return name;
    }

    public void addImport(ImportNode importNode) {
        imports.add(importNode);
    }

    public void addExport(ExportNode exportNode) {
        exports.add(exportNode);
    }

    public void addModuleRequest(String moduleRequest) {
        requestedModules.add(moduleRequest);
    }

    public void addImportEntry(ImportEntry importEntry) {
        importEntries.add(importEntry);
        importedLocalNames.put(importEntry.getLocalName(), importEntry);
    }

    public void addLocalExportEntry(long exportToken, ExportEntry exportEntry) {
        localExportEntries.add(exportEntry);
        addExportedName(exportToken, exportEntry);
        if (!moduleScope.hasSymbol(exportEntry.getLocalName())) {
            throw parser.error(AbstractParser.message("export.not.defined", exportEntry.getLocalName()), exportToken);
        }
    }

    public void addIndirectExportEntry(long exportToken, ExportEntry exportEntry) {
        indirectExportEntries.add(exportEntry);
        addExportedName(exportToken, exportEntry);
    }

    public void addStarExportEntry(ExportEntry exportEntry) {
        starExportEntries.add(exportEntry);
    }

    private void addExportedName(long exportToken, ExportEntry exportEntry) {
        if (!exportedNames.add(exportEntry.getExportName())) {
            throw parser.error(AbstractParser.message("duplicate.export", exportEntry.getExportName()), exportToken);
        }
    }

    private void resolveExports() {
        for (ExportNode export : exports) {
            long exportToken = export.getToken();
            if (export.getNamedExports() != null) {
                assert export.getExportIdentifier() == null;
                for (ExportSpecifierNode s : export.getNamedExports().getExportSpecifiers()) {
                    String localName = s.getIdentifier().getName();
                    ExportEntry ee;
                    if (s.getExportIdentifier() != null) {
                        ee = ExportEntry.exportSpecifier(s.getExportIdentifier().getName(), localName);
                    } else {
                        ee = ExportEntry.exportSpecifier(localName);
                    }
                    if (export.getFrom() == null) {
                        ImportEntry ie = importedLocalNames.get(localName);
                        if (ie == null) {
                            addLocalExportEntry(exportToken, ee);
                        } else if (ie.getImportName().equals(Module.STAR_NAME)) {
                            // This is a re-export of an imported module namespace object.
                            addLocalExportEntry(exportToken, ee);
                        } else {
                            // This is a re-export of a single name.
                            addIndirectExportEntry(exportToken, ExportEntry.exportIndirect(ee.getExportName(), ie.getModuleRequest(), ie.getImportName()));
                        }
                    } else {
                        addIndirectExportEntry(exportToken, ee.withFrom(export.getFrom().getModuleSpecifier().getValue()));
                    }
                }
            } else if (export.getFrom() != null) {
                String moduleRequest = export.getFrom().getModuleSpecifier().getValue();
                if (export.getExportIdentifier() == null) {
                    addStarExportEntry(ExportEntry.exportStarFrom(moduleRequest));
                } else {
                    addIndirectExportEntry(exportToken, ExportEntry.exportStarAsNamespaceFrom(export.getExportIdentifier().getName(), moduleRequest));
                }
            } else if (export.isDefault()) {
                addLocalExportEntry(exportToken, ExportEntry.exportDefault(export.getExportIdentifier().getName()));
            } else {
                addLocalExportEntry(exportToken, ExportEntry.exportSpecifier(export.getExportIdentifier().getName()));
            }
        }
    }

    public Module createModule() {
        resolveExports();
        return new Module(requestedModules, importEntries, localExportEntries, indirectExportEntries, starExportEntries, imports, exports);
    }
}