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package io.muserver;

import java.util.List;
import java.util.Map;
import java.util.Objects;

import static io.muserver.Mutils.urlEncode;
import static java.util.Collections.emptyList;

class NettyRequestParameters implements RequestParameters {

    private final Map> parameters;

    NettyRequestParameters(Map> parameters) {
        Mutils.notNull("parameters", parameters);
        this.parameters = parameters;
    }

    @Override
    public Map> all() {
        return parameters;
    }

    @Override
    public String get(String name) {
        return get(name, null);
    }

    @Override
    public String get(String name, String defaultValue) {
        List values = parameters.get(name);
        if (values == null) {
            return defaultValue;
        }
        return values.get(0);
    }

    @Override
    public int getInt(String name, int defaultValue) {
        try {
            String stringVal = get(name, null);
            if (stringVal == null) {
                return defaultValue;
            }
            return Integer.parseInt(stringVal, 10);
        } catch (NumberFormatException e) {
            return defaultValue;
        }
    }

    @Override
    public long getLong(String name, long defaultValue) {
        try {
            String stringVal = get(name, null);
            if (stringVal == null) {
                return defaultValue;
            }
            return Long.parseLong(stringVal, 10);
        } catch (NumberFormatException e) {
            return defaultValue;
        }
    }

    @Override
    public float getFloat(String name, float defaultValue) {
        try {
            String stringVal = get(name, null);
            if (stringVal == null) {
                return defaultValue;
            }
            return Float.parseFloat(stringVal);
        } catch (NumberFormatException e) {
            return defaultValue;
        }
    }

    @Override
    public double getDouble(String name, double defaultValue) {
        try {
            String stringVal = get(name, null);
            if (stringVal == null) {
                return defaultValue;
            }
            return Double.parseDouble(stringVal);
        } catch (NumberFormatException e) {
            return defaultValue;
        }
    }

    @Override
    public boolean getBoolean(String name) {
        String val = get(name, "").toLowerCase();
        return isTruthy(val);
    }

    static boolean isTruthy(String val) {
        switch (val) {
            case "true":
            case "on":
            case "yes":
            case "1":
                return true;
            default:
                return false;
        }
    }

    @Override
    public List getAll(String name) {
        List values = parameters.get(name);
        if (values == null) {
            return emptyList();
        }
        return values;
    }

    @Override
    public boolean contains(String name) {
        return parameters.containsKey(name);
    }


    @Override
    public boolean equals(Object o) {
        if (this == o) return true;
        if (o == null || getClass() != o.getClass()) return false;
        NettyRequestParameters that = (NettyRequestParameters) o;
        return Objects.equals(parameters, that.parameters);
    }

    @Override
    public int hashCode() {
        return Objects.hash(parameters);
    }

    @Override
    public String toString() {
        StringBuilder sb = new StringBuilder();
        boolean isFirst = true;
        for (Map.Entry> entry : parameters.entrySet()) {
            for (String value : entry.getValue()) {
                if (!isFirst) {
                    sb.append('&');
                }
                sb.append(urlEncode(entry.getKey())).append('=').append(urlEncode(value));
                isFirst = false;
            }
        }
        return sb.toString();
    }
}