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//      Magicbane Emulator Project © 2013 - 2026
//                https://www.magicbane.com

package engine.parsers.wpak;

import engine.parsers.objects.wpak.CompoundCurveTemplate;
import org.pmw.tinylog.Logger;

import java.util.ArrayList;
import java.util.HashMap;

// Loads CompoundCurves.cfg.

public class CompoundCurveParser {

    private static final String fileName = "Config/CompoundCurves.cfg";

    // Segments run back to back on one line, so the param count per simple curve
    // is what tells where the next segment starts.
    private static final HashMap<String, Integer> paramCounts = new HashMap<>();

    static {
        paramCounts.put("FlatLine", 0);
        paramCounts.put("SlopedLine", 1);
        paramCounts.put("SlopedInitValLine", 1);
    }

    public static HashMap<String, CompoundCurveTemplate> parseCompoundCurvesFile() {

        HashMap<String, CompoundCurveTemplate> curves = new HashMap<>();
        ArrayList<WpakLine> lines;
        CompoundCurveTemplate curve;
        int failedCount = 0;

        try {
            lines = WpakFileReader.readLines(fileName);
        } catch (Exception e) {
            Logger.error(fileName + ": " + e.getMessage());
            return null;
        }

        for (WpakLine line : lines) {
            try {
                curve = parseCurveLine(line);

                if (curves.containsKey(curve.name))
                    throw line.error("duplicate curve " + curve.name);

                curves.put(curve.name, curve);
            } catch (WpakFormatException e) {
                Logger.error(e.getMessage());
                failedCount++;
            }
        }

        Logger.info("Loaded " + curves.size() + " of " + lines.size() + " compound curves");

        if (failedCount > 0)
            return null;

        return curves;
    }

    private static CompoundCurveTemplate parseCurveLine(WpakLine line) {

        CompoundCurveTemplate curve = new CompoundCurveTemplate();
        CompoundCurveTemplate.Segment segment;
        Integer paramCount;
        int index = 1;

        curve.name = line.token(0);

        while (line.has(index)) {
            segment = new CompoundCurveTemplate.Segment();
            segment.down_per_range = line.intToken(index);
            segment.simple_curve = line.token(index + 1);
            paramCount = paramCounts.get(segment.simple_curve);

            if (paramCount == null)
                throw line.error("unknown simple curve " + segment.simple_curve);

            segment.params = new float[paramCount];

            for (int i = 0; i < paramCount; i++)
                segment.params[i] = line.floatToken(index + 2 + i);

            curve.segments.add(segment);
            index += 2 + paramCount;
        }

        if (curve.segments.isEmpty())
            throw line.error("curve " + curve.name + " has no segments");

        return curve;
    }
}