/*
 * Copyright 2018 faddenSoft
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
using System;
using System.Collections.Generic;

namespace PluginCommon {
    /// <summary>
    /// Script "plugins" must implement this interface.
    /// </summary>
    public interface IPlugin {
        /// <summary>
        /// Identification string.  Contents are arbitrary, but should briefly identify the
        /// purpose of the plugin, e.g. "Apple II ProDOS 8 MLI call handler".  It may
        /// contain version information, but should not be expected to be machine-readable.
        /// </summary>
        string Identifier { get; }

        /// <summary>
        /// Returns true if this plugin checks JSR/JSL for inline data.
        /// </summary>
        //bool HasInlineDataAnalyzer { get; }

        /// <summary>
        /// Initializes the plugin with an application reference and a buffer with file
        /// data.  Called before each analysis pass.
        /// 
        /// In the current implementation, the file data will be the same every time,
        /// because plugins are discarded when a project is closed.  However, this may
        /// change if we add a descramble feature.
        /// </summary>
        /// <param name="appRef">Reference to application interface.</param>
        /// <param name="fileData">65xx code and data.</param>
        /// <param name="platSyms">Platform symbols, in no particular order.</param>
        void Prepare(IApplication appRef, byte[] fileData, List<PlatSym> platSyms);

        /// <summary>
        /// Checks to see if code/data near a JSR instruction should be formatted.
        /// 
        /// The file data is guaranteed to hold the JSR (offset + 2).
        /// </summary>
        /// <param name="offset">Offset of the JSR instruction.</param>
        /// <param name="noContinue">Set to true if the JSR doesn't actually return.</param>
        void CheckJsr(int offset, out bool noContinue);

        /// <summary>
        /// Checks to see if code/data near a JSL instruction should be formatted.
        /// 
        /// The file data is guaranteed to hold the JSL (offset + 3).
        /// </summary>
        /// <param name="offset">Offset of the JSL instruction.</param>
        /// <param name="noContinue">Set to true if the JSL doesn't actually return.</param>
        void CheckJsl(int offset, out bool noContinue);
    }

    /// <summary>
    /// Interfaces provided by the application for use by plugins.
    /// </summary>
    public interface IApplication {
        /// <summary>
        /// Sends a debug message to the application.  This can be useful when debugging scripts.
        /// (Use DEBUG > Show Analyzer Output to view it.)
        /// </summary>
        /// <param name="msg">Message to send.</param>
        void DebugLog(string msg);

        /// <summary>
        /// Specifies operand formatting.
        /// </summary>
        /// <param name="offset">File offset of opcode.</param>
        /// <param name="subType">Sub-type.  Must be appropriate for NumericLE.</param>
        /// <param name="label">Optional symbolic label.</param>
        /// <returns>True if the change was made, false if it was rejected.</returns>
        bool SetOperandFormat(int offset, DataSubType subType, string label);

        /// <summary>
        /// Formats file data as inline data.
        /// </summary>
        /// <param name="offset">File offset.</param>
        /// <param name="length">Length of item.</param>
        /// <param name="type">Type of item.  Must be NumericLE, NumericBE, or Dense.</param>
        /// <param name="subType">Sub-type.  Must be appropriate for type.</param>
        /// <param name="label">Optional symbolic label.</param>
        /// <returns>True if the change was made, false if it was rejected.</returns>
        bool SetInlineDataFormat(int offset, int length, DataType type,
                DataSubType subType, string label);

        // Might want to add:
        //  int AddressToOffset(int address)  // returns 24-bit offset, or -1 if outside file
        //  int OffsetToAddress(int offset)   // returns 24-bit address
        // (although we could also just pass the address map in at Prepare() -- more efficient
        //  if this gets called frequently)
    }

    /// <summary>
    /// Data format type.
    /// </summary>
    public enum DataType {
        Unknown = 0,
        NumericLE,
        NumericBE,
        String,
        Dense,
        Fill
    }

    /// <summary>
    /// Data format sub-type.
    /// </summary>
    public enum DataSubType {
        // No sub-type specified.
        None = 0,

        // For NumericLE/BE
        Hex,
        Decimal,
        Binary,
        Ascii,
        Address,
        Symbol
    }
}