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

#include "lib/mlrutil.h"
#include "lib/mtrand.h"
#include "containers/slls.h"
#include "input/readers.h"
#include "mapping/mappers.h"
#include "output/writers.h"
#include "cli/mlrcli.h"
#include "cli/argparse.h"

// ----------------------------------------------------------------
static mapper_setup_t* mapper_lookup_table[] = {
	&mapper_cat_setup,
	&mapper_check_setup,
	&mapper_count_distinct_setup,
	&mapper_cut_setup,
	&mapper_filter_setup,
	&mapper_group_by_setup,
	&mapper_group_like_setup,
	&mapper_having_fields_setup,
	&mapper_head_setup,
	&mapper_histogram_setup,
	&mapper_label_setup,
	&mapper_put_setup,
	&mapper_rename_setup,
	&mapper_reorder_setup,
	&mapper_sort_setup,
	&mapper_stats1_setup,
	&mapper_stats2_setup,
	&mapper_step_setup,
	&mapper_tac_setup,
	&mapper_tail_setup,
	&mapper_top_setup,
	&mapper_uniq_setup,
};
static int mapper_lookup_table_length = sizeof(mapper_lookup_table) / sizeof(mapper_lookup_table[0]);

// ----------------------------------------------------------------
#define DEFAULT_RS   '\n'
#define DEFAULT_FS   ','
#define DEFAULT_PS   '='
#define DEFAULT_OFMT "%lf"

// ----------------------------------------------------------------
// xxx cmt stdout/err & 0/1
static void main_usage(char* argv0, int exit_code) {
	FILE* o = exit_code == 0 ? stdout : stderr;
	fprintf(o, "Usage: %s [I/O options] {verb} [verb-dependent options ...] {file names}\n", argv0);
	fprintf(o, "verbs:\n");
	for (int i = 0; i < mapper_lookup_table_length; i++) {
		if (i > 0)
			fprintf(o, " ");
		fprintf(o, "%s", mapper_lookup_table[i]->verb);
	}
	fprintf(o, "\n");
	fprintf(o, "Please use \"%s {verb name} --help\" for verb-specific help.\n", argv0);

	fprintf(o, "\n");
	fprintf(o, "I/O options:\n");
	// xxx type up more here
	fprintf(o, "  --rs      --irs     --ors\n");
	fprintf(o, "  --fs      --ifs     --ofs    --repifs\n");
	fprintf(o, "  --ps      --ips     --ops\n");
	fprintf(o, "  --dkvp    --idkvp   --odkvp\n");
	fprintf(o, "  --nidx    --inidx   --onidx\n");
	fprintf(o, "  --csv     --icsv    --ocsv\n");
	fprintf(o, "  --pprint  --ipprint --opprint --right\n");
	fprintf(o, "  --xtab    --ixtab   --oxtab\n");
	fprintf(o, "  --ofmt\n");

	exit(exit_code);
}

static void nusage(char* argv0, char* arg) {
	fprintf(stdout, "%s: option \"%s\" not recognized.\n", argv0, arg);
	fprintf(stdout, "\n");
	main_usage(argv0, 1);
}

static void check_arg_count(char** argv, int argi, int argc, int n) {
	if ((argc - argi) < n) {
		main_usage(argv[0], 1);
	}
}

static char sep_from_arg(char* arg, char* argv0) {
	if (streq(arg, "tab"))
		return '\t';
	if (streq(arg, "space"))
		return ' ';
	if (streq(arg, "newline"))
		return '\n';
	if (streq(arg, "pipe"))
		return '|';
	if (streq(arg, "semicolon"))
		return '|';
	if (strlen(arg) != 1)
		main_usage(argv0, 1);
	return arg[0];
}

static mapper_setup_t* look_up_mapper_setup(char* verb) {
	mapper_setup_t* pmapper_setup = NULL;
	for (int i = 0; i < mapper_lookup_table_length; i++) {
		if (streq(mapper_lookup_table[i]->verb, verb))
			return mapper_lookup_table[i];
	}

	return pmapper_setup;
}

// ----------------------------------------------------------------
cli_opts_t* parse_command_line(int argc, char** argv) {
	cli_opts_t* popts = mlr_malloc_or_die(sizeof(cli_opts_t));
	memset(popts, 0, sizeof(*popts));

	popts->irs  = DEFAULT_RS;
	popts->ifs  = DEFAULT_FS;
	popts->ips  = DEFAULT_PS;
	popts->allow_repeat_ifs = FALSE;

	popts->ors  = DEFAULT_RS;
	popts->ofs  = DEFAULT_FS;
	popts->ops  = DEFAULT_PS;
	popts->ofmt = DEFAULT_OFMT;

	popts->preader = NULL;
	popts->pwriter = NULL;
	popts->filenames = NULL;

	char* rdesc = "dkvp";
	char* wdesc = "dkvp";
	int left_align_pprint = TRUE;

	int have_rand_seed = FALSE;
	unsigned rand_seed = 0;

	int argi = 1;
	for (; argi < argc; argi++) {
		if (argv[argi][0] != '-')
			break;

		else if (streq(argv[argi], "-h"))
			main_usage(argv[0], 0);
		else if (streq(argv[argi], "--help"))
			main_usage(argv[0], 0);

		else if (streq(argv[argi], "--rs")) {
			check_arg_count(argv, argi, argc, 2);
			popts->ors = popts->irs = sep_from_arg(argv[argi+1], argv[0]);
			argi++;
		}
		else if (streq(argv[argi], "--irs")) {
			check_arg_count(argv, argi, argc, 2);
			popts->irs = sep_from_arg(argv[argi+1], argv[0]);
			argi++;
		}
		else if (streq(argv[argi], "--ors")) {
			check_arg_count(argv, argi, argc, 2);
			popts->ors = sep_from_arg(argv[argi+1], argv[0]);
			argi++;
		}

		else if (streq(argv[argi], "--fs")) {
			check_arg_count(argv, argi, argc, 2);
			popts->ofs = popts->ifs = sep_from_arg(argv[argi+1], argv[0]);
			argi++;
		}
		else if (streq(argv[argi], "--ifs")) {
			check_arg_count(argv, argi, argc, 2);
			popts->ifs = sep_from_arg(argv[argi+1], argv[0]);
			argi++;
		}
		else if (streq(argv[argi], "--ofs")) {
			check_arg_count(argv, argi, argc, 2);
			popts->ofs = sep_from_arg(argv[argi+1], argv[0]);
			argi++;
		}
		else if (streq(argv[argi], "--repifs")) {
			popts->allow_repeat_ifs = TRUE;
		}

		else if (streq(argv[argi], "--ps")) {
			check_arg_count(argv, argi, argc, 2);
			popts->ops = popts->ips = sep_from_arg(argv[argi+1], argv[0]);
			argi++;
		}
		else if (streq(argv[argi], "--ips")) {
			check_arg_count(argv, argi, argc, 2);
			popts->ips = sep_from_arg(argv[argi+1], argv[0]);
			argi++;
		}
		else if (streq(argv[argi], "--ops")) {
			check_arg_count(argv, argi, argc, 2);
			popts->ops = sep_from_arg(argv[argi+1], argv[0]);
			argi++;
		}

		else if (streq(argv[argi], "--dkvp"))    { rdesc = wdesc = "dkvp"; }
		else if (streq(argv[argi], "--idkvp"))   { rdesc = "dkvp"; }
		else if (streq(argv[argi], "--odkvp"))   { wdesc = "dkvp"; }

		else if (streq(argv[argi], "--csv"))     { rdesc = wdesc = "csv";  }
		else if (streq(argv[argi], "--icsv"))    { rdesc = "csv";  }
		else if (streq(argv[argi], "--ocsv"))    { wdesc = "csv";  }

		else if (streq(argv[argi], "--nidx"))    { rdesc = wdesc = "nidx"; }
		else if (streq(argv[argi], "--inidx"))   { rdesc = "nidx"; }
		else if (streq(argv[argi], "--onidx"))   { wdesc = "nidx"; }

		else if (streq(argv[argi], "--xtab"))    { rdesc = wdesc = "xtab"; }
		else if (streq(argv[argi], "--ixtab"))   { rdesc = "xtab"; }
		else if (streq(argv[argi], "--oxtab"))   { wdesc = "xtab"; }

		else if (streq(argv[argi], "--ipprint")) { rdesc = "csv"; popts->ifs = ' '; popts->allow_repeat_ifs = TRUE;}
		else if (streq(argv[argi], "--opprint")) { wdesc = "pprint"; }
		else if (streq(argv[argi], "--pprint"))  { rdesc = wdesc = "csv"; popts->ifs = ' '; popts->allow_repeat_ifs = TRUE;}
		else if (streq(argv[argi], "--right"))   { left_align_pprint = FALSE; }

		else if (streq(argv[argi], "--ofmt")) {
			check_arg_count(argv, argi, argc, 2);
			popts->ofmt = argv[argi+1];
			argi++;
		}

		else if (streq(argv[argi], "--seed")) {
			check_arg_count(argv, argi, argc, 2);
			if (sscanf(argv[argi+1], "0x%x", &rand_seed) == 1) {
				have_rand_seed = TRUE;
			} else if (sscanf(argv[argi+1], "%u", &rand_seed) == 1) {
				have_rand_seed = TRUE;
			} else {
				main_usage(argv[0], 1);
			}
			argi++;
		}

		else
			nusage(argv[0], argv[argi]);
	}

	if      (streq(rdesc, "dkvp")) popts->preader = reader_dkvp_alloc(popts->irs, popts->ifs, popts->ips, popts->allow_repeat_ifs);
	else if (streq(rdesc, "csv"))  popts->preader = reader_csv_alloc(popts->irs, popts->ifs, popts->allow_repeat_ifs);
	else if (streq(rdesc, "nidx")) popts->preader = reader_nidx_alloc(popts->irs, popts->ifs, popts->allow_repeat_ifs);
	else if (streq(rdesc, "xtab")) popts->preader = reader_xtab_alloc(popts->ips, TRUE); // xxx parameterize allow_repeat_ips
	else {
		main_usage(argv[0], 1);
	}

	if      (streq(wdesc, "dkvp"))   popts->pwriter = writer_dkvp_alloc(popts->ors, popts->ofs, popts->ops);
	else if (streq(wdesc, "csv"))    popts->pwriter = writer_csv_alloc(popts->ors, popts->ofs);
	else if (streq(wdesc, "nidx"))   popts->pwriter = writer_nidx_alloc(popts->ors, popts->ofs);
	else if (streq(wdesc, "xtab"))   popts->pwriter = writer_xtab_alloc();
	else if (streq(wdesc, "pprint")) popts->pwriter = writer_pprint_alloc(left_align_pprint);
	else {
		main_usage(argv[0], 1);
	}

	if ((argc - argi) < 1) {
		main_usage(argv[0], 1);
	}

	if (have_rand_seed) {
		mtrand_init(rand_seed);
	} else {
		mtrand_init_default();
	}

	popts->pmapper_list = sllv_alloc();
	while (TRUE) {
		check_arg_count(argv, argi, argc, 1);
		char* verb = argv[argi];

		mapper_setup_t* pmapper_setup = look_up_mapper_setup(verb);
		if (pmapper_setup == NULL) {
			fprintf(stderr, "%s: verb \"%s\" not found. Please use \"%s --help\" for a list.\n",
				argv[0], verb, argv[0]);
			exit(1);
		}

		if ((argc - argi) >= 2) {
			if (streq(argv[argi+1], "-h") || streq(argv[argi+1], "--help")) {
				pmapper_setup->pusage_func(argv[0], verb);
				exit(0);
			}
		}

		// It's up to the parse func to print its usage on CLI-parse failure.
		mapper_t* pmapper = pmapper_setup->pparse_func(&argi, argc, argv);
		if (pmapper == NULL) {
			exit(1);
		}
		sllv_add(popts->pmapper_list, pmapper);

		// xxx cmt
		if (argi >= argc || !streq(argv[argi], "then"))
			break;
		argi++;
	}

	popts->filenames = &argv[argi];

	return popts;
}

// ----------------------------------------------------------------
void cli_opts_free(cli_opts_t* popts) {

	popts->preader->pfree_func(popts->preader->pvstate);

	for (sllve_t* pe = popts->pmapper_list->phead; pe != NULL; pe = pe->pnext) {
		mapper_t* pmapper = pe->pvdata;
		pmapper->pmapper_free_func(pmapper->pvstate);
	}
	sllv_free(popts->pmapper_list);

	popts->pwriter->pfree_func(popts->pwriter->pvstate);
	free(popts);
}