/****************************************************************
 *
 * MODULE:     v.extrude
 *
 * AUTHOR(S):  Jachym Cepicky <jachym.cepicky gmail.com>
 *             Support for points & OGR support (08/2007, 2009), new
 *             parameters cats, where, method (2013) added by Martin
 *             Landa <landa.martin gmail.com>
 *
 * PURPOSE:    "Extrudes" flat polygons and lines to 3D with defined height
 *             Useful for creating buildings for displaying with NVIZ
 *
 *             Based on v.example by Radim Blazek
 *             Inspired by d.vect and v.drape
 *             Coding help and code cleaning by Markus Neteler
 *
 * COPYRIGHT:  (C) 2005-2010,2013 by the GRASS Development Team
 *
 *             This program is free software under the GNU General
 *             Public License (>=v2). Read the file COPYING that comes
 *             with GRASS for details.
 ****************************************************************/

#include <stdio.h>
#include <stdlib.h>
#include <grass/gis.h>
#include <grass/raster.h>
#include <grass/vector.h>
#include <grass/glocale.h>
#include <grass/dbmi.h>

#include "local_proto.h"

int main(int argc, char *argv[])
{
    struct GModule *module;
    struct {
        struct Option *input, *output, *zshift, *height, *elevation, *hcolumn,
            *type, *field, *cats, *where, *interp, *scale, *null;
    } opt;
    struct {
        struct Flag *trace;
    } flag;

    struct Map_info In, Out;
    struct line_pnts *Points;
    struct line_cats *Cats;
    struct bound_box map_box;

    struct cat_list *cat_list;

    struct Cell_head window;

    int field;
    int only_type, cat;
    int fdrast, interp_method, trace;
    double objheight, objheight_default, voffset;
    double scale, null_val;

    struct field_info *Fi;
    dbDriver *driver = NULL;

    char *comment;

    module = G_define_module();
    G_add_keyword(_("vector"));
    G_add_keyword(_("geometry"));
    G_add_keyword(_("sampling"));
    G_add_keyword(_("3D"));
    module->label = _("Extrudes flat vector features to 3D vector features "
                      "with defined height.");
    module->description = _("Optionally the height can be derived from "
                            "sampling of elevation raster map.");

    flag.trace = G_define_flag();
    flag.trace->key = 't';
    flag.trace->description = _("Trace elevation");
    flag.trace->guisection = _("Elevation");

    opt.input = G_define_standard_option(G_OPT_V_INPUT);

    opt.field = G_define_standard_option(G_OPT_V_FIELD_ALL);
    opt.field->guisection = _("Selection");

    opt.cats = G_define_standard_option(G_OPT_V_CATS);
    opt.cats->guisection = _("Selection");

    opt.where = G_define_standard_option(G_OPT_DB_WHERE);
    opt.where->guisection = _("Selection");

    opt.type = G_define_standard_option(G_OPT_V_TYPE);
    opt.type->answer = "point,line,area";
    opt.type->options = "point,line,area";
    opt.type->guisection = _("Selection");

    opt.output = G_define_standard_option(G_OPT_V_OUTPUT);

    opt.zshift = G_define_option();
    opt.zshift->key = "zshift";
    opt.zshift->description = _("Shifting value for z coordinates");
    opt.zshift->type = TYPE_DOUBLE;
    opt.zshift->required = NO;
    opt.zshift->answer = "0";
    opt.zshift->guisection = _("Height");

    opt.height = G_define_option();
    opt.height->key = "height";
    opt.height->type = TYPE_DOUBLE;
    opt.height->required = NO;
    opt.height->multiple = NO;
    opt.height->description = _("Fixed height for 3D vector features");
    opt.height->guisection = _("Height");

    opt.hcolumn = G_define_standard_option(G_OPT_DB_COLUMN);
    opt.hcolumn->key = "height_column";
    opt.hcolumn->multiple = NO;
    opt.hcolumn->description =
        _("Name of attribute column with feature height");
    opt.hcolumn->guisection = _("Height");

    /* raster sampling */
    opt.elevation = G_define_standard_option(G_OPT_R_ELEV);
    opt.elevation->required = NO;
    opt.elevation->description =
        _("Elevation raster map for height extraction");
    opt.elevation->guisection = _("Elevation");

    opt.interp = G_define_standard_option(G_OPT_R_INTERP_TYPE);
    opt.interp->answer = "nearest";
    opt.interp->guisection = _("Elevation");

    opt.scale = G_define_option();
    opt.scale->key = "scale";
    opt.scale->type = TYPE_DOUBLE;
    opt.scale->description = _("Scale factor sampled raster values");
    opt.scale->answer = "1.0";
    opt.scale->guisection = _("Elevation");

    opt.null = G_define_option();
    opt.null->key = "null_value";
    opt.null->type = TYPE_DOUBLE;
    opt.null->description = _("Height for sampled raster NULL values");
    opt.null->guisection = _("Elevation");

    G_gisinit(argv[0]);

    G_option_required(opt.height, opt.hcolumn, opt.elevation, NULL);

    if (G_parser(argc, argv))
        exit(EXIT_FAILURE);

    sscanf(opt.zshift->answer, "%lf", &voffset);
    G_debug(1, "voffset = %f", voffset);

    if (opt.height->answer)
        sscanf(opt.height->answer, "%lf", &objheight);
    else
        objheight = 0.;
    G_debug(1, "objheight = %f", objheight);
    objheight_default = objheight;

    only_type = Vect_option_to_types(opt.type);

    /* sampling method */
    interp_method = Rast_option_to_interp_type(opt.interp);

    /* used to scale sampled raster values */
    scale = atof(opt.scale->answer);

    /* is null value defined */
    if (opt.null->answer)
        null_val = atof(opt.null->answer);

    /* trace elevation */
    trace = flag.trace->answer ? TRUE : FALSE;

    /* set input vector map name and mapset */
    Vect_check_input_output_name(opt.input->answer, opt.output->answer,
                                 G_FATAL_EXIT);

    Points = Vect_new_line_struct();
    Cats = Vect_new_cats_struct();

    Vect_set_open_level(2); /* topology required for input */

    /* opening input vector map */
    if (Vect_open_old2(&In, opt.input->answer, "", opt.field->answer) < 0)
        G_fatal_error(_("Unable to open vector map <%s>"), opt.input->answer);

    Vect_set_error_handler_io(&In, &Out);

    /* creating output vector map */
    if (Vect_open_new(&Out, opt.output->answer, WITH_Z) < 0)
        G_fatal_error(_("Unable to create vector map <%s>"),
                      opt.output->answer);

    field = Vect_get_field_number(&In, opt.field->answer);

    if ((opt.hcolumn->answer || opt.cats->answer || opt.where->answer) &&
        field == -1) {
        G_warning(
            _("Invalid layer number (%d). "
              "Parameter '%s', '%s' or '%s' specified, assuming layer '1'."),
            field, opt.hcolumn->key, opt.cats->key, opt.where->key);
        field = 1;
    }

    /* set constraint for cats or where */
    cat_list = NULL;
    if (field > 0)
        cat_list = Vect_cats_set_constraint(&In, field, opt.where->answer,
                                            opt.cats->answer);

    Vect_hist_copy(&In, &Out);
    Vect_hist_command(&Out);

    /* opening database connection, if required */
    if (opt.hcolumn->answer) {
        int ctype;
        dbColumn *column;

        if ((Fi = Vect_get_field(&In, field)) == NULL)
            G_fatal_error(_("Database connection not defined for layer %d"),
                          field);

        if ((driver = db_start_driver_open_database(Fi->driver,
                                                    Fi->database)) == NULL)
            G_fatal_error(_("Unable to open database <%s> by driver <%s>"),
                          Fi->database, Fi->driver);
        db_set_error_handler_driver(driver);

        if (db_get_column(driver, Fi->table, opt.hcolumn->answer, &column) !=
            DB_OK)
            G_fatal_error(_("Column <%s> does not exist"), opt.hcolumn->answer);
        else
            db_free_column(column);

        ctype = db_column_Ctype(driver, Fi->table, opt.hcolumn->answer);

        if (ctype != DB_C_TYPE_INT && ctype != DB_C_TYPE_STRING &&
            ctype != DB_C_TYPE_DOUBLE) {
            G_fatal_error(_("Column <%s>: invalid data type"),
                          opt.hcolumn->answer);
        }
    }

    /* do we work with elevation raster? */
    fdrast = -1;
    if (opt.elevation->answer) {
        /* raster setup */
        G_get_window(&window);

        /* open the elev raster, and check for error condition */
        fdrast = Rast_open_old(opt.elevation->answer, "");
    }

    /* if area */
    if (only_type & GV_AREA) {
        int area, nareas, centroid;

        nareas = Vect_get_num_areas(&In);
        G_debug(2, "n_areas = %d", nareas);
        if (nareas > 0)
            G_message(_("Extruding areas..."));
        for (area = 1; area <= nareas; area++) {
            G_debug(3, "area = %d", area);
            G_percent(area, nareas, 2);

            if (!Vect_area_alive(&In, area))
                continue;

            centroid = Vect_get_area_centroid(&In, area);
            if (!centroid) {
                G_warning(_("Skipping area %d without centroid"), area);
                continue;
            }

            Vect_read_line(&In, NULL, Cats, centroid);
            if (field > 0 && !Vect_cats_in_constraint(Cats, field, cat_list))
                continue;

            /* height attribute */
            if (opt.hcolumn->answer) {
                cat = Vect_get_area_cat(&In, area, field);
                if (cat == -1) {
                    G_warning(_("No category defined for area %d. Using "
                                "default fixed height %f."),
                              area, objheight_default);
                    objheight = objheight_default;
                }
                if (get_height(Fi, opt.hcolumn->answer, driver, cat,
                               &objheight) != 0) {
                    G_warning(_("Unable to fetch height from DB for area %d. "
                                "Using default fixed height %f."),
                              area, objheight_default);
                    objheight = objheight_default;
                }
            } /* if opt.hcolumn->answer */

            Vect_get_area_points(&In, area, Points);

            G_debug(3, "area: %d height: %f", area, objheight);

            extrude(&In, &Out, Cats, Points, fdrast, trace, interp_method,
                    scale, opt.null->answer ? TRUE : FALSE, null_val, objheight,
                    voffset, &window, GV_AREA, centroid);
        } /* foreach area */
    }

    if (only_type > 0) {
        int line, nlines;
        int type;

        G_debug(1, "other than areas");
        /* loop through each line in the dataset */
        nlines = Vect_get_num_lines(&In);
        G_message(_("Extruding features..."));
        for (line = 1; line <= nlines; line++) {
            /* progress feedback */
            G_percent(line, nlines, 2);

            if (!Vect_line_alive(&In, line))
                continue;

            /* read line */
            type = Vect_read_line(&In, Points, Cats, line);

            if (!(type & only_type))
                continue;

            if (field > 0 && !Vect_cats_in_constraint(Cats, field, cat_list))
                continue;

            /* height attribute */
            if (opt.hcolumn->answer) {
                cat = Vect_get_line_cat(&In, line, field);
                if (cat == -1) {
                    G_warning(_("No category defined for feature %d. Using "
                                "default fixed height %f."),
                              line, objheight_default);
                    objheight = objheight_default;
                }
                if (get_height(Fi, opt.hcolumn->answer, driver, cat,
                               &objheight) != 0) {
                    G_warning(_("Unable to fetch height from DB for line %d. "
                                "Using default fixed height %f."),
                              line, objheight_default);
                    objheight = objheight_default;
                }
            } /* if opt.hcolumn->answer */

            extrude(&In, &Out, Cats, Points, fdrast, trace, interp_method,
                    scale, opt.null->answer ? TRUE : FALSE, null_val, objheight,
                    voffset, &window, type, -1);
        } /* for each line */
    }     /* else if area */

    if (driver) {
        db_close_database(driver);
        db_shutdown_driver(driver);
    }

    G_important_message(_("Copying attribute table..."));
    if (field < 0)
        Vect_copy_tables(&In, &Out, 0);
    else
        Vect_copy_table_by_cat_list(&In, &Out, field, field, NULL, GV_1TABLE,
                                    cat_list);

    Vect_build(&Out);

    /* header */
    G_asprintf(&comment, "Generated by %s from vector map <%s>",
               G_program_name(), Vect_get_full_name(&In));
    Vect_set_comment(&Out, comment);
    G_free(comment);

    Vect_get_map_box(&Out, &map_box);

    Vect_close(&In);
    Vect_close(&Out);

    Vect_destroy_line_struct(Points);
    Vect_destroy_cats_struct(Cats);

    G_done_msg("T: %f B: %f.", map_box.T, map_box.B);

    exit(EXIT_SUCCESS);
}