package Torello.JavaDoc;


// *** *** *** *** *** *** *** *** *** *** *** *** *** *** *** *** *** *** *** *** *** *** *** ***
// Standard-Java Imports
// *** *** *** *** *** *** *** *** *** *** *** *** *** *** *** *** *** *** *** *** *** *** *** ***

import java.io.IOException;
import java.util.Optional;


// *** *** *** *** *** *** *** *** *** *** *** *** *** *** *** *** *** *** *** *** *** *** *** ***
// Java-HTML Imports
// *** *** *** *** *** *** *** *** *** *** *** *** *** *** *** *** *** *** *** *** *** *** *** ***

import Torello.Java.*;

import static Torello.Java.C.*;
import static Torello.JavaDoc.PF.*;

import Torello.Java.Additional.Ret2;
import Torello.Java.ReadOnly.ReadOnlyList;
import Torello.Java.ReadOnly.ROArrayListBuilder;


// *** *** *** *** *** *** *** *** *** *** *** *** *** *** *** *** *** *** *** *** *** *** *** ***
// JDUInternal
// *** *** *** *** *** *** *** *** *** *** *** *** *** *** *** *** *** *** *** *** *** *** *** ***

import Torello.JDUInternal.Annotations.EntityAnnotations.EntityAnnotationData;
import Torello.JDUInternal.Parse.HTML.Signature.D1_CallableSignature;


// *** *** *** *** *** *** *** *** *** *** *** *** *** *** *** *** *** *** *** *** *** *** *** ***
// The new Source-Code Parser: com.sun.source.*
// *** *** *** *** *** *** *** *** *** *** *** *** *** *** *** *** *** *** *** *** *** *** *** ***

import com.sun.source.tree.MethodTree;


/**
 *<B CLASS=JDDescLabel>Reflection Class:</B>
 * 
 * <BR />Holds all information extracted from <CODE>'&#46;java'</CODE> Source-Files about Method's
 * identified in that file.
 * 
 * <EMBED CLASS='external-html' DATA-FILE-ID=JPB_GET_INST>
 * <EMBED CLASS='external-html' DATA-FILE-ID=JPB_METHOD>
 */
@JDHeaderBackgroundImg(EmbedTagFileID={"REFLECTION_EXTENSION"})
public class Method
    extends Callable
    implements java.io.Serializable, Comparable<Method>, Cloneable
{
    /** <EMBED CLASS='external-html' DATA-FILE-ID=SVUID> */
    public static final long serialVersionUID = 1;

    /**
     * The return type of the {@code method}, as a {@code String}.  If this is a method with a
     * {@code 'void'} return-type, this shall be "void".
     */
    public final String returnType;

    /**
     * The return type of the {@code method}, as a {@code String}.
     * <BR /><BR />
     * <EMBED CLASS='external-html' DATA-FILE-ID=JPB_JOW_TITLE>
     */
    public final String returnTypeJOW;


    // ********************************************************************************************
    // ********************************************************************************************
    // Reference-Hook: com.sun.source.tree
    // ********************************************************************************************
    // ********************************************************************************************


    /**
     * <EMBED CLASS='external-html' DATA-FILE-ID=SSTB_HOOK_FIELD>
     * 
     * If a user decides to make use of the native Oracle {@code MethodTree} instance that was
     * used to build this {@code Method} instance, it may be retrieved from this {@code transient}
     * field.
     */
    public final transient MethodTree methodTree;


    // ********************************************************************************************
    // ********************************************************************************************
    // Constructor - com.sun.source.tree 
    // ********************************************************************************************
    // ********************************************************************************************

    
    // Public, but internally-used-only Constructor for "Method"
    public Method(
            final MethodTree            mt,
            final EntityAnnotationData  ead,
            final TreeUtils             util
        )
    {
        super(mt, mt.getName().toString(), Entity.METHOD, ead, util);

        this.returnType     = mt.getReturnType().toString();
        this.returnTypeJOW  = StrSource.typeToJavaIdentifier(this.returnType);
        this.methodTree     = mt;
    }


    // ********************************************************************************************
    // ********************************************************************************************
    // Constructor: Used Internally by SignatureParse / SummaryHTMLFile
    // ********************************************************************************************
    // ********************************************************************************************


    // Ensures that the Version with longer type-information strings is used.
    // Java Doc often uses longer type strings than is available from the source-code parse
    // Remember, JavaParser Symbol-Solver doesn't work well, and the Sun/Oracle Parser doesn't have
    // a linker at all.
    //
    // Called from JDUInternal.ParseHTML.SignatureParse:
    //      This is used when the JavaDocHTMLFile is asking that a method be retrieved based on
    //      input from **BOTH** the HTML-File **AND** the Source-File

    public Method(final D1_CallableSignature cSig, final Method mFromSourceParser)
    {
        // Does the same thing as the loop statement below, but for the "parameterTypes"
        super(cSig, mFromSourceParser);

        // Java Doc always produces "java.lang.String", while JP just gives "String"
        //
        // REMEMBER: JP is lazy when it comes to "Package Information" for types.
        //           Java-Doc includes it often - BUT NOT ALWAYS.  (See above comment)
        //
        // Remember, though, the rest of the JavaParser fields are filled out, Java Doc
        // leaves out all the other information that JP retrieves.

        this.returnType =
            (cSig.returnType.length() > mFromSourceParser.returnType.length())
                ? cSig.returnType
                : mFromSourceParser.returnType;

        // This should never matter.  They must be identical.
        this.returnTypeJOW = mFromSourceParser.returnTypeJOW;

        // Save the reference hook
        this.methodTree = mFromSourceParser.methodTree;
    }

    // Used for "Synthetic Methods ONLY!"  Literally, this line is the only way this particular
    // Constructor could ever be called:
    //
    // From JDUInternal.ParseHTML.SignatureParse:
    //      if (StrCmpr.equalsXOR(cSig.name, "valueOf", "values")) return new Method(cSig);

    public Method(final D1_CallableSignature cSig)
    {
        // Does the same thing as the loop statement below, but for the "parameterTypes"
        super(cSig, Entity.METHOD);

        this.returnType         = cSig.returnType;
        this.returnTypeJOW      = cSig.returnTypeJOW;
        this.methodTree         = null;
    }


    // ********************************************************************************************
    // ********************************************************************************************
    // toString()
    // ********************************************************************************************
    // ********************************************************************************************


    /**
     * Generates a string of this method, with most information included.
     * 
     * <BR /><BR /><B CLASS=JDDescLabel>Reduced Information:</B>
     * 
     * <BR />This {@code 'toString'} will not return every piece of information contained by this
     * class. For example, both the method body, and any possible JavaDoc Comments are not
     * included.  For a more enhanced {@code toString()} method version, invoke the 
     * {@link #toString(int) toString(PrintFlags)} method which accepts {@link PF Print-Flags}.
     * 
     * @return A printable {@code String} of this method.
     * @see PF
     * @see #toString(int)
     */
    public String toString()
    {
        return
            "Name:            [" + name + "]\n" +
            "Signature:       [" + StrPrint.abbrevEndRDSF(signature, MAX_STR_LEN, true) + "]\n" +
            "Modifiers:       [" + StrCSV.toCSV(modifiers, true, true, null) + "]\n" +
            printedParameterNamesTS() +
            printedParameterTypesTS() +
            "Return Type:     [" + returnType + "]\n" +
            printedExceptionsTS() +

            // This will **NEVER** be null - unless 'this' instance was built from an HTML File,
            // rather than a source-code file.  Instances like that are only used temporarily, and
            // are garbage collected instantly.  Do this check anyway (just in case).

            "Location:        " + ((this.location == null)
                ? "null" 
                : ('[' + this.location.quickSummary() + ']'));
    }

    /**
     * <EMBED CLASS='external-html' DATA-FILE-ID=TO_STR_PF>
     * @param flags These are defined in the {@link PF Print-Flags} class
     * @return A printable {@code String} of this {@code Method}.
     * @see #toString()
     * @see PF
     */
    public String toString(int flags)
    {
        boolean color = (flags & UNIX_COLORS) > 0;
        Ret2<Boolean, Boolean> jow = jowFlags(flags);

        return 
            printedName("Method", 20, color) +
            printedSignature(20, color) +
            printedModifiers(20) +
            printedParamNames() + 
            printedParamTypes(jow) +
            printedReturnType(jow, color) +
            printedExceptions() +
            printedLocation(20, color, (flags & BRIEF_LOCATION) > 0) +

            // The previous method does not add a '\n' end to the end of the returned string
            // These are both optional, they add a '\n' AT THE BEGINNING if one of them is included

            printedComments(20, color, (flags & JAVADOC_COMMENTS) > 0) +
            printedCallableBody(flags);
    }

    private String printedReturnType(Ret2<Boolean, Boolean> jow, boolean color)
    {
        String rt = null, rtJOW = null;

        // *** *** *** *** *** *** *** *** *** *** *** *** *** *** *** *** *** *** *** *** *** ***
        // Worry about the colors first
        // *** *** *** *** *** *** *** *** *** *** *** *** *** *** *** *** *** *** *** *** *** ***

        if (jow.a || jow.b)
            rtJOW = color ? (BGREEN + returnTypeJOW + RESET) : returnTypeJOW;

        if (! jow.b)
            rt = color ? (BGREEN + returnType + RESET) : returnType;
        

        // *** *** *** *** *** *** *** *** *** *** *** *** *** *** *** *** *** *** *** *** *** ***
        // Now print the string
        // *** *** *** *** *** *** *** *** *** *** *** *** *** *** *** *** *** *** *** *** *** ***

        if (jow.b /*onlyJOW*/) return "Return Simple-Type: [" + rtJOW + "]\n";

        else if (jow.a /*addJOW*/) return
            "Return Type:        [" + rt + "]\n" +
            "Return Simple-Type: [" + rtJOW + "]\n";

        else return "Return Type:        [" + rt + "]\n";
    }


    // ********************************************************************************************
    // ********************************************************************************************
    // CompareTo & Equals
    // ********************************************************************************************
    // ********************************************************************************************


    /**
     * Java's {@code interface Comparable<T>} requirements.  This does a very simple comparison
     * using the two method's {@link #name} field. If the name comparison will not
     * suffice in making a decision, then the number of parameters, and parameter-types are used
     * to making the sort-decision.
     * 
     * @param m Any other {@code Method} to be compared to {@code 'this' Method}
     * 
     * @return An integer that fulfills Java's {@code Comparable<Method>} interface
     * requirements.
     */
    public int compareTo(Method m)
    {
        // Identical References
        if (this == m) return 0;

        // Sorting by ignoring case is best - usually for the looks of a list
        // NOTE: Returning '0' is bad, because a TreeSet will remove duplicate-elements.  This
        //       means two different meethods with the same name would not "fit" into a treeset.

        int ret = this.name.compareToIgnoreCase(m.name);
        if (ret != 0) return ret;

        // Try to identify a different without ignoring case.
        ret = this.name.compareTo(m.name);
        if (ret != 0) return ret;

        ret = this.numParameters() - m.numParameters();
        if (ret != 0) return ret;

        for (int i=0; i < this.parameterTypesJOW.size(); i++)
        {
            ret = this.parameterTypesJOW.get(i).compareTo(m.parameterTypesJOW.get(i));
            if (ret != 0) return ret;
        }

        return 0;
    }

    /**
     * This <I>should be called an "atypical version" of </I>the usual {@code equals(Object other)}
     * method.  This version of equals merely compares the name and parameters-list of the method.
     * The presumption here is that the definition of a 'method' only has 
     * meaning - <I>at all</I> - inside the context of a {@code class, interface, } or
     * {@code enumerated-type} where that method is defined. Since inside any {@code '.java'}
     * source-code file, there may only be one method with a given name and parameter-list, this
     * shall return {@code TRUE} whenever the method being compared has the same name and parameter
     * types as {@code 'this'} does.
     * 
     * @param other This may be any other {@code method}.  It is <I><B>strongly suggested</B></I>
     * that this be a {@code method} defined in the same {@code '.java'} source-code file as
     * {@code 'this' method}.
     * 
     * @return This method returns {@code TRUE} when {@code 'this'} instance of {@code Method} has
     * <B>both</B> the same {@code public final Sting name} <B>and</B> the same parameter-list as
     * {@code 'other'}.
     */
    public boolean equals(Method other)
    {
        // The method's must have the same name!
        if (! this.name.equals(other.name)) return false;

        // If the number of parameters in the 'other' instance of Method differ from the number
        // of parameters in 'this' Method, then return FALSE immediately.  It cannot be a match.

        if (this.numParameters() != other.numParameters()) return false;

        // If both of these have zero parameters, and their names have matched, return true
        // immediately

        if (this.numParameters() == 0) return true;

        // If any of the parameter-names are different, break immediately and return false;
        for (int i=0; i < this.parameterNames.size(); i++)
            if (! this.parameterNames.get(i).equals(other.parameterNames.get(i))) return false;

        // If the parameter-types listed by the javadoc '.html' file differ from the parameter
        // types listed in the original '.java' source-code file, then break immediately.
        //
        // NOTE: The "package-information" for the FULL CLASS OR INTERFACE NAME is not always
        //       available.

        for (int i=0; i < this.parameterTypesJOW.size(); i++)
            if (! this.parameterTypesJOW.get(i).equals(other.parameterTypesJOW.get(i)))
                return false;

        // ALL TEST PASSED
        return true;
    }


    // ********************************************************************************************
    // ********************************************************************************************
    // A.I. Token-Stream Generator-Method
    // ********************************************************************************************
    // ********************************************************************************************


    public ReadOnlyList<ReadOnlyList<String>> getTokenStreams()
    {
        final ROArrayListBuilder<ReadOnlyList<String>>  tokens  = new ROArrayListBuilder<>();
        ROArrayListBuilder<String>                      b       = new ROArrayListBuilder<>();

        tokens.add(ReadOnlyList.of("SECTION", "entity", "method"));
        tokens.add(ReadOnlyList.of("SECTION", "name", this.name));
        tokens.add(ReadOnlyList.of("SECTION", "signature", this.signature));
        tokens.add(ReadOnlyList.of("SECTION", "return-type", this.returnTypeJOW));

        if ((this.parameterNames != null) && (this.parameterNames.size() > 0))
        {
            b.add("SECTION");
            b.add("parameters");
            for (int i = 0; i < this.parameterNames.size(); i++)
                b.add(this.parameterTypesJOW.get(i) + " " + this.parameterNames.get(i));
            tokens.add(b.build());
        }

        if ((this.modifiers != null) && (modifiers.size() > 0))
        {
            b = new ROArrayListBuilder<>();
            b.add("SECTION");
            b.add("modifiers");
            for (String m : this.modifiers) b.add(m);
            tokens.add(b.build());
        }

        if ((this.exceptions != null) && (this.exceptions.size() > 0))
        {
            b = new ROArrayListBuilder<>();
            b.add("SECTION");
            b.add("throws");
            for (String exn : this.exceptions) b.add(exn);
            tokens.add(b.build());
        }

        if ((this.annotations != null) && (annotations.size() > 0))
        {
            b = new ROArrayListBuilder<>();
            b.add("SECTION");
            b.add("annotations");
            for (String a : this.annotations) b.add(a);
            tokens.add(b.build());
        }

        return tokens.build();
    }

}