#include "readstat.h"

readstat_type_class_t readstat_type_class(readstat_type_t type) {
    if (type == READSTAT_TYPE_STRING || type == READSTAT_TYPE_STRING_REF)
        return READSTAT_TYPE_CLASS_STRING;

    return READSTAT_TYPE_CLASS_NUMERIC;
}

readstat_type_t readstat_value_type(readstat_value_t value) {
    return value.type;
}

readstat_type_class_t readstat_value_type_class(readstat_value_t value) {
    return readstat_type_class(value.type);
}

char readstat_value_tag(readstat_value_t value) {
    return value.tag;
}

int readstat_value_is_missing(readstat_value_t value, readstat_variable_t *variable) {
    if (value.is_system_missing || value.is_tagged_missing)
        return 1;

    if (variable)
        return readstat_value_is_defined_missing(value, variable);

    return 0;
}

int readstat_value_is_system_missing(readstat_value_t value) {
    return (value.is_system_missing);
}

int readstat_value_is_tagged_missing(readstat_value_t value) {
    return (value.is_tagged_missing);
}

static int readstat_double_is_defined_missing(double fp_value, readstat_variable_t *variable) {
    int count = readstat_variable_get_missing_ranges_count(variable);
    int i;
    for (i=0; i<count; i++) {
        double lo = readstat_double_value(readstat_variable_get_missing_range_lo(variable, i));
        double hi = readstat_double_value(readstat_variable_get_missing_range_hi(variable, i));
        if (fp_value >= lo && fp_value <= hi) {
            return 1;
        }
    }
    return 0;
}

static int readstat_string_is_defined_missing(const char *string, readstat_variable_t *variable) {
    if (string == NULL)
        return 0;

    int count = readstat_variable_get_missing_ranges_count(variable);
    int i;
    for (i=0; i<count; i++) {
        const char *lo = readstat_string_value(readstat_variable_get_missing_range_lo(variable, i));
        const char *hi = readstat_string_value(readstat_variable_get_missing_range_hi(variable, i));
        if (lo && hi && strcmp(string, lo) >= 0 && strcmp(string, hi) <= 0) {
            return 1;
        }
    }
    return 0;
}

int readstat_value_is_defined_missing(readstat_value_t value, readstat_variable_t *variable) {
    if (readstat_value_type_class(value) != readstat_variable_get_type_class(variable))
        return 0;

    if (readstat_value_type_class(value) == READSTAT_TYPE_CLASS_STRING)
        return readstat_string_is_defined_missing(readstat_string_value(value), variable);

    if (readstat_value_type_class(value) == READSTAT_TYPE_CLASS_NUMERIC)
        return readstat_double_is_defined_missing(readstat_double_value(value), variable);

    return 0;
}

char readstat_int8_value(readstat_value_t value) {
    if (readstat_value_is_system_missing(value))
        return 0;

    if (value.type == READSTAT_TYPE_DOUBLE)
        return (char)value.v.double_value;
    if (value.type == READSTAT_TYPE_FLOAT)
        return (char)value.v.float_value;
    if (value.type == READSTAT_TYPE_INT32)
        return (char)value.v.i32_value;
    if (value.type == READSTAT_TYPE_INT16)
        return (char)value.v.i16_value;
    if (value.type == READSTAT_TYPE_INT8)
        return value.v.i8_value;

    return 0;
}

int16_t readstat_int16_value(readstat_value_t value) {
    if (readstat_value_is_system_missing(value))
        return 0;

    if (value.type == READSTAT_TYPE_DOUBLE)
        return (int16_t)value.v.double_value;
    if (value.type == READSTAT_TYPE_FLOAT)
        return (int16_t)value.v.float_value;
    if (value.type == READSTAT_TYPE_INT32)
        return (int16_t)value.v.i32_value;
    if (value.type == READSTAT_TYPE_INT16)
        return value.v.i16_value;
    if (value.type == READSTAT_TYPE_INT8)
        return value.v.i8_value;

    return 0;
}

int32_t readstat_int32_value(readstat_value_t value) {
    if (readstat_value_is_system_missing(value))
        return 0;

    if (value.type == READSTAT_TYPE_DOUBLE)
        return (int32_t)value.v.double_value;
    if (value.type == READSTAT_TYPE_FLOAT)
        return (int32_t)value.v.float_value;
    if (value.type == READSTAT_TYPE_INT32)
        return value.v.i32_value;
    if (value.type == READSTAT_TYPE_INT16)
        return value.v.i16_value;
    if (value.type == READSTAT_TYPE_INT8)
        return value.v.i8_value;

    return 0;
}

float readstat_float_value(readstat_value_t value) {
    if (readstat_value_is_system_missing(value))
        return NAN;

    if (value.type == READSTAT_TYPE_DOUBLE)
        return (float)value.v.double_value;
    if (value.type == READSTAT_TYPE_FLOAT)
        return value.v.float_value;
    if (value.type == READSTAT_TYPE_INT32)
        return value.v.i32_value;
    if (value.type == READSTAT_TYPE_INT16)
        return value.v.i16_value;
    if (value.type == READSTAT_TYPE_INT8)
        return value.v.i8_value;

    return value.v.float_value;
}

double readstat_double_value(readstat_value_t value) {
    if (readstat_value_is_system_missing(value))
        return NAN;

    if (value.type == READSTAT_TYPE_DOUBLE)
        return value.v.double_value;
    if (value.type == READSTAT_TYPE_FLOAT)
        return value.v.float_value;
    if (value.type == READSTAT_TYPE_INT32)
        return value.v.i32_value;
    if (value.type == READSTAT_TYPE_INT16)
        return value.v.i16_value;
    if (value.type == READSTAT_TYPE_INT8)
        return value.v.i8_value;

    return NAN;
}

const char *readstat_string_value(readstat_value_t value) {
    if (readstat_value_type(value) == READSTAT_TYPE_STRING)
        return value.v.string_value;

    return NULL;
}