#ifndef INPUT_H
#define INPUT_H

#include <stdlib.h>
#include <stdio.h>
#include <stdint.h>
#include <stdbool.h>
#include <ctype.h>

#include "espa_metadata.h"
#include "parse_metadata.h"
#include "write_metadata.h"
#include "envi_header.h"
#include "espa_geoloc.h"
#include "raw_binary_io.h"


#define GAIN_BIAS_FILL (-999.0)
#define LOW_SATURATION 1
#define HIGH_SATURATION 255


/* Satellite type definition */
typedef enum
{
    SAT_NULL = -1,
    SAT_LANDSAT_4,
    SAT_LANDSAT_5,
    SAT_LANDSAT_7,
    SAT_LANDSAT_8,
    SAT_LANDSAT_9,
    SAT_MAX
} Satellite_t;

/* Instrument type definition */
typedef enum
{
    INST_NULL = -1,
    INST_TM,
    INST_ETM,
    INST_OLI_TIRS,
    INST_TIRS,
    INST_MAX
} Instrument_t;

/* Structure for the metadata */
typedef struct
{
    Satellite_t satellite;      /* Satellite */
    Instrument_t instrument;    /* Instrument */
    char *product_id;           /* ProductID */
    Map_coord_t ul_map_corner;  /* Map projection coordinates of the upper
                                   left corner of the pixel in the upper left
                                   corner of the image */
    Map_coord_t lr_map_corner;  /* Map projection coordinates of the lower
                                   right corner of the pixel in the lower right
                                   corner of the image */
} Input_meta_t;

/* Structure for the 'input' data type */
typedef struct
{
    Input_meta_t meta;          /* Input metadata */
    int lines;
    int samples;
    float x_pixel_size;
    float y_pixel_size;
    char reference_band_name[30];
    char reference_band_name_2[30]; /* ETM's b6h */
    char *band_name[MAX_INPUT_BANDS];
    FILE *band_fd[MAX_INPUT_BANDS];
    int fill_value[MAX_INPUT_BANDS];
    float thermal_rad_gain;       /* Thermal radiance gain */
    float thermal_rad_bias;       /* Thermal radiance bias */
    float thermal_rad_gain_2;     /* ETM's b6h thermal radiance gain */
    float thermal_rad_bias_2;     /* ETM's b6h thermal radiance bias */
} Input_Data_t;


/* Prototypes */
Input_Data_t *open_input
(
    Espa_internal_meta_t *metadata,
    bool modtran_flag
);

int close_input
(
    Input_Data_t *input,
    bool modtran_flag
);

int read_input
(
    const Input_Data_t *input_data,
    float *band_thermal,
    int16_t *band_elevation,
    int pixel_count,
    bool modtran_flag
);

float *read_unc_input_float
(
    char *input_filename,
    int pixel_count
);

uint8_t *read_unc_input_uint8
(
    char *input_filename,
    int pixel_count
);

uint16_t *read_unc_input_uint16
(
    char *input_filename,
    int pixel_count
);

#endif