/*
 * Copyright (C) 2015-2018 S[&]T, The Netherlands.
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are met:
 *
 * 1. Redistributions of source code must retain the above copyright notice,
 *    this list of conditions and the following disclaimer.
 *
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 *
 * 3. Neither the name of the copyright holder nor the names of its
 *    contributors may be used to endorse or promote products derived from
 *    this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
 * POSSIBILITY OF SUCH DAMAGE.
 */

#include "coda.h"
#include "harp-constants.h"
#include "harp-ingestion.h"

#include <stdlib.h>
#include <string.h>

typedef struct ingest_info_struct
{
    coda_product *product;
    long num_time;
    long num_vertical;
} ingest_info;

static int init_dimensions(ingest_info *info)
{
    coda_cursor cursor;
    long coda_dim[CODA_MAX_NUM_DIMS];
    int num_coda_dims;

    if (coda_cursor_set_product(&cursor, info->product) != 0)
    {
        harp_set_error(HARP_ERROR_CODA, NULL);
        return -1;
    }
    if (coda_cursor_goto(&cursor, "/mole_concentration_of_ozone_in_air") != 0)
    {
        harp_set_error(HARP_ERROR_CODA, NULL);
        return -1;
    }
    if (coda_cursor_get_array_dim(&cursor, &num_coda_dims, coda_dim) != 0)
    {
        harp_set_error(HARP_ERROR_CODA, NULL);
        return -1;
    }
    if (num_coda_dims != 2)
    {
        harp_set_error(HARP_ERROR_INGESTION, "dataset has %d dimensions, expected 2", num_coda_dims);
        harp_add_coda_cursor_path_to_error_message(&cursor);
        return -1;
    }
    info->num_time = coda_dim[0];
    info->num_vertical = coda_dim[1];

    return 0;
}

static void ingestion_done(void *user_data)
{
    free(user_data);
}

static int ingestion_init(const harp_ingestion_module *module, coda_product *product,
                          const harp_ingestion_options *options, harp_product_definition **definition, void **user_data)
{
    ingest_info *info;

    (void)options;

    info = malloc(sizeof(ingest_info));
    if (info == NULL)
    {
        harp_set_error(HARP_ERROR_OUT_OF_MEMORY, "out of memory (could not allocate %lu bytes) (%s:%u)",
                       sizeof(ingest_info), __FILE__, __LINE__);
        return -1;
    }

    info->product = product;

    if (init_dimensions(info) != 0)
    {
        ingestion_done(info);
        return -1;
    }

    *definition = *module->product_definition;
    *user_data = info;

    return 0;
}

static int read_dataset(ingest_info *info, const char *path, long num_elements, harp_array data)
{
    coda_cursor cursor;
    long coda_num_elements;
    harp_scalar fill_value;

    if (coda_cursor_set_product(&cursor, info->product) != 0)
    {
        harp_set_error(HARP_ERROR_CODA, NULL);
        return -1;
    }
    if (coda_cursor_goto(&cursor, path) != 0)
    {
        harp_set_error(HARP_ERROR_CODA, NULL);
        return -1;
    }
    if (coda_cursor_get_num_elements(&cursor, &coda_num_elements) != 0)
    {
        harp_set_error(HARP_ERROR_CODA, NULL);
        return -1;
    }
    if (coda_num_elements != num_elements)
    {
        harp_set_error(HARP_ERROR_INGESTION, "dataset has %ld elements (expected %ld)", coda_num_elements,
                       num_elements);
        harp_add_coda_cursor_path_to_error_message(&cursor);
        harp_add_error_message(" (%s:%lu)", __FILE__, __LINE__);
        return -1;
    }
    if (coda_cursor_read_double_array(&cursor, data.double_data, coda_array_ordering_c) != 0)
    {
        harp_set_error(HARP_ERROR_CODA, NULL);
        return -1;
    }
    if (coda_cursor_goto(&cursor, "@FillValue") == 0)
    {
        if (coda_cursor_read_double(&cursor, &fill_value.double_data) != 0)
        {
            char str[4];

            if (coda_cursor_read_string(&cursor, str, sizeof(str)) != 0)
            {
                harp_set_error(HARP_ERROR_CODA, NULL);
                return -1;
            }
            if (strcmp(str, "NaN") == 0)
            {
                fill_value.double_data = coda_NaN();
            }
            else
            {
                harp_set_error(HARP_ERROR_INGESTION, "Invalid FillValue '%s'", str);
                return -1;
            }
        }
        harp_array_replace_fill_value(harp_type_double, num_elements, data, fill_value);
    }

    return 0;
}

static int read_dimensions(void *user_data, long dimension[HARP_NUM_DIM_TYPES])
{
    ingest_info *info = (ingest_info *)user_data;

    dimension[harp_dimension_time] = info->num_time;
    dimension[harp_dimension_vertical] = info->num_vertical;

    return 0;
}

static int read_datetime(void *user_data, harp_array data)
{
    ingest_info *info = (ingest_info *)user_data;

    return read_dataset(info, "/time", info->num_time, data);
}

static int read_longitude(void *user_data, harp_array data)
{
    ingest_info *info = (ingest_info *)user_data;

    return read_dataset(info, "/longitude", info->num_time, data);
}

static int read_latitude(void *user_data, harp_array data)
{
    ingest_info *info = (ingest_info *)user_data;

    return read_dataset(info, "/latitude", info->num_time, data);
}

static int read_altitude(void *user_data, harp_array data)
{
    ingest_info *info = (ingest_info *)user_data;

    return read_dataset(info, "/altitude", info->num_time * info->num_vertical, data);
}

static int read_pressure(void *user_data, harp_array data)
{
    ingest_info *info = (ingest_info *)user_data;

    return read_dataset(info, "/air_pressure", info->num_vertical, data);
}

static int read_temperature(void *user_data, harp_array data)
{
    ingest_info *info = (ingest_info *)user_data;

    return read_dataset(info, "/air_temperature", info->num_time * info->num_vertical, data);
}

static int read_o3_number_density(void *user_data, harp_array data)
{
    ingest_info *info = (ingest_info *)user_data;

    return read_dataset(info, "/mole_concentration_of_ozone_in_air", info->num_time * info->num_vertical, data);
}

static int read_o3_number_density_error(void *user_data, harp_array data)
{
    ingest_info *info = (ingest_info *)user_data;

    return read_dataset(info, "/mole_concentration_of_ozone_in_air_standard_error", info->num_time * info->num_vertical,
                        data);
}

int harp_ingestion_module_cci_l2_o3_lp_init(void)
{
    harp_ingestion_module *module;
    harp_product_definition *product_definition;
    harp_variable_definition *variable_definition;
    harp_dimension_type dimension_type[3] = { harp_dimension_time, harp_dimension_vertical, harp_dimension_vertical };
    harp_dimension_type pressure_dimension_type[1] = { harp_dimension_vertical };
    const char *description;
    const char *path;

    module = harp_ingestion_register_module_coda("ESACCI_OZONE_L2_LP", "Ozone CCI", "ESACCI_OZONE", "L2_LP",
                                                 "CCI L2 O3 limb profile", ingestion_init, ingestion_done);

    /* ESACCI_OZONE_L2_LP product */
    product_definition = harp_ingestion_register_product(module, "ESACCI_OZONE_L2_LP", NULL, read_dimensions);

    /* datetime */
    description = "time of the measurement";
    variable_definition =
        harp_ingestion_register_variable_full_read(product_definition, "datetime", harp_type_double, 1, dimension_type,
                                                   NULL, description, "days since 1900-01-01", NULL, read_datetime);
    path = "/time[]";
    harp_variable_definition_add_mapping(variable_definition, NULL, NULL, path, NULL);

    /* longitude */
    description = "longitude of the ground pixel center";
    variable_definition =
        harp_ingestion_register_variable_full_read(product_definition, "longitude", harp_type_double, 1, dimension_type,
                                                   NULL, description, "degree_east", NULL, read_longitude);
    harp_variable_definition_set_valid_range_double(variable_definition, -180.0f, 180.0f);
    path = "/longitude[]";
    harp_variable_definition_add_mapping(variable_definition, NULL, NULL, path, NULL);

    /* latitude */
    description = "latitude of the ground pixel center";
    variable_definition =
        harp_ingestion_register_variable_full_read(product_definition, "latitude", harp_type_double, 1, dimension_type,
                                                   NULL, description, "degree_north", NULL, read_latitude);
    harp_variable_definition_set_valid_range_double(variable_definition, -90.0f, 90.0f);
    path = "/latitude[]";
    harp_variable_definition_add_mapping(variable_definition, NULL, NULL, path, NULL);

    /* altitude */
    description = "geometric altitude above mean sea-level";
    variable_definition =
        harp_ingestion_register_variable_full_read(product_definition, "altitude", harp_type_double, 2, dimension_type,
                                                   NULL, description, "km", NULL, read_altitude);
    path = "/altitude[]";
    harp_variable_definition_add_mapping(variable_definition, NULL, NULL, path, NULL);

    /* pressure */
    description = "pressure";
    variable_definition =
        harp_ingestion_register_variable_full_read(product_definition, "pressure", harp_type_double, 1,
                                                   pressure_dimension_type, NULL, description, "hPa", NULL,
                                                   read_pressure);
    path = "/air_pressure[]";
    harp_variable_definition_add_mapping(variable_definition, NULL, NULL, path, NULL);

    /* temperature */
    description = "temperature";
    variable_definition =
        harp_ingestion_register_variable_full_read(product_definition, "temperature", harp_type_double, 2,
                                                   dimension_type, NULL, description, "K", NULL, read_temperature);
    path = "/air_temperature[]";
    harp_variable_definition_add_mapping(variable_definition, NULL, NULL, path, NULL);

    /* O3_number_density */
    description = "O3 number density";
    variable_definition =
        harp_ingestion_register_variable_full_read(product_definition, "O3_number_density", harp_type_double, 2,
                                                   dimension_type, NULL, description, "mol/cm^3", NULL,
                                                   read_o3_number_density);
    path = "/mole_concentration_of_ozone_in_air[]";
    harp_variable_definition_add_mapping(variable_definition, NULL, NULL, path, NULL);

    /* O3_number_density_uncertainty */
    description = "uncertainty of the O3 number density";
    variable_definition =
        harp_ingestion_register_variable_full_read(product_definition, "O3_number_density_uncertainty",
                                                   harp_type_double, 2, dimension_type, NULL, description, "mol/cm^3",
                                                   NULL, read_o3_number_density_error);
    path = "/mole_concentration_of_ozone_in_air_standard_error[]";
    harp_variable_definition_add_mapping(variable_definition, NULL, NULL, path, NULL);

    return 0;
}