/* notmuch - Not much of an email program, (just index and search)
 *
 * Copyright © 2009 Carl Worth
 *
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program.  If not, see http://www.gnu.org/licenses/ .
 *
 * Author: Carl Worth <cworth@cworth.org>
 */

#include "notmuch-client.h"
#include "sprinter.h"

typedef enum {
    OUTPUT_SUMMARY,
    OUTPUT_THREADS,
    OUTPUT_MESSAGES,
    OUTPUT_FILES,
    OUTPUT_TAGS
} output_t;

static char *
sanitize_string (const void *ctx, const char *str)
{
    char *out, *loop;

    if (NULL == str)
	return NULL;

    loop = out = talloc_strdup (ctx, str);

    for (; *loop; loop++) {
	if ((unsigned char)(*loop) < 32)
	    *loop = '?';
    }
    return out;
}

static int
do_search_threads (sprinter_t *format,
		   notmuch_query_t *query,
		   notmuch_sort_t sort,
		   output_t output,
		   int offset,
		   int limit)
{
    notmuch_thread_t *thread;
    notmuch_threads_t *threads;
    notmuch_tags_t *tags;
    time_t date;
    int i;

    if (offset < 0) {
	offset += notmuch_query_count_threads (query);
	if (offset < 0)
	    offset = 0;
    }

    threads = notmuch_query_search_threads (query);
    if (threads == NULL)
	return 1;

    format->begin_list (format);

    for (i = 0;
	 notmuch_threads_valid (threads) && (limit < 0 || i < offset + limit);
	 notmuch_threads_move_to_next (threads), i++)
    {
	thread = notmuch_threads_get (threads);

	if (i < offset) {
	    notmuch_thread_destroy (thread);
	    continue;
	}

	if (output == OUTPUT_THREADS) {
	    format->set_prefix (format, "thread");
	    format->string (format,
			    notmuch_thread_get_thread_id (thread));
	    format->separator (format);
	} else { /* output == OUTPUT_SUMMARY */
	    void *ctx_quote = talloc_new (thread);
	    const char *authors = notmuch_thread_get_authors (thread);
	    const char *subject = notmuch_thread_get_subject (thread);
	    const char *thread_id = notmuch_thread_get_thread_id (thread);
	    int matched = notmuch_thread_get_matched_messages (thread);
	    int total = notmuch_thread_get_total_messages (thread);
	    const char *relative_date = NULL;
	    notmuch_bool_t first_tag = TRUE;

	    format->begin_map (format);

	    if (sort == NOTMUCH_SORT_OLDEST_FIRST)
		date = notmuch_thread_get_oldest_date (thread);
	    else
		date = notmuch_thread_get_newest_date (thread);

	    relative_date = notmuch_time_relative_date (ctx_quote, date);

	    if (format->is_text_printer) {
                /* Special case for the text formatter */
		printf ("thread:%s %12s [%d/%d] %s; %s (",
			thread_id,
			relative_date,
			matched,
			total,
			sanitize_string (ctx_quote, authors),
			sanitize_string (ctx_quote, subject));
	    } else { /* Structured Output */
		format->map_key (format, "thread");
		format->string (format, thread_id);
		format->map_key (format, "timestamp");
		format->integer (format, date);
		format->map_key (format, "date_relative");
		format->string (format, relative_date);
		format->map_key (format, "matched");
		format->integer (format, matched);
		format->map_key (format, "total");
		format->integer (format, total);
		format->map_key (format, "authors");
		format->string (format, authors);
		format->map_key (format, "subject");
		format->string (format, subject);
	    }

	    talloc_free (ctx_quote);

	    format->map_key (format, "tags");
	    format->begin_list (format);

	    for (tags = notmuch_thread_get_tags (thread);
		 notmuch_tags_valid (tags);
		 notmuch_tags_move_to_next (tags))
	    {
		const char *tag = notmuch_tags_get (tags);

		if (format->is_text_printer) {
                  /* Special case for the text formatter */
		    if (first_tag)
			first_tag = FALSE;
		    else
			fputc (' ', stdout);
		    fputs (tag, stdout);
		} else { /* Structured Output */
		    format->string (format, tag);
		}
	    }

	    if (format->is_text_printer)
		printf (")");

	    format->end (format);
	    format->end (format);
	    format->separator (format);
	}

	notmuch_thread_destroy (thread);
    }

    format->end (format);

    return 0;
}

static int
do_search_messages (sprinter_t *format,
		    notmuch_query_t *query,
		    output_t output,
		    int offset,
		    int limit)
{
    notmuch_message_t *message;
    notmuch_messages_t *messages;
    notmuch_filenames_t *filenames;
    int i;

    if (offset < 0) {
	offset += notmuch_query_count_messages (query);
	if (offset < 0)
	    offset = 0;
    }

    messages = notmuch_query_search_messages (query);
    if (messages == NULL)
	return 1;

    format->begin_list (format);

    for (i = 0;
	 notmuch_messages_valid (messages) && (limit < 0 || i < offset + limit);
	 notmuch_messages_move_to_next (messages), i++)
    {
	if (i < offset)
	    continue;

	message = notmuch_messages_get (messages);

	if (output == OUTPUT_FILES) {
	    filenames = notmuch_message_get_filenames (message);

	    for (;
		 notmuch_filenames_valid (filenames);
		 notmuch_filenames_move_to_next (filenames))
	    {
		format->string (format, notmuch_filenames_get (filenames));
		format->separator (format);
	    }
	    
	    notmuch_filenames_destroy( filenames );

	} else { /* output == OUTPUT_MESSAGES */
	    format->set_prefix (format, "id");
	    format->string (format,
			    notmuch_message_get_message_id (message));
	    format->separator (format);
	}

	notmuch_message_destroy (message);
    }

    notmuch_messages_destroy (messages);

    format->end (format);

    return 0;
}

static int
do_search_tags (notmuch_database_t *notmuch,
		sprinter_t *format,
		notmuch_query_t *query)
{
    notmuch_messages_t *messages = NULL;
    notmuch_tags_t *tags;
    const char *tag;

    /* should the following only special case if no excluded terms
     * specified? */

    /* Special-case query of "*" for better performance. */
    if (strcmp (notmuch_query_get_query_string (query), "*") == 0) {
	tags = notmuch_database_get_all_tags (notmuch);
    } else {
	messages = notmuch_query_search_messages (query);
	if (messages == NULL)
	    return 1;

	tags = notmuch_messages_collect_tags (messages);
    }
    if (tags == NULL)
	return 1;

    format->begin_list (format);

    for (;
	 notmuch_tags_valid (tags);
	 notmuch_tags_move_to_next (tags))
    {
	tag = notmuch_tags_get (tags);

	format->string (format, tag);
	format->separator (format);

    }

    notmuch_tags_destroy (tags);

    if (messages)
	notmuch_messages_destroy (messages);

    format->end (format);

    return 0;
}

enum {
    EXCLUDE_TRUE,
    EXCLUDE_FALSE,
    EXCLUDE_FLAG,
};

int
notmuch_search_command (void *ctx, int argc, char *argv[])
{
    notmuch_config_t *config;
    notmuch_database_t *notmuch;
    notmuch_query_t *query;
    char *query_str;
    notmuch_sort_t sort = NOTMUCH_SORT_NEWEST_FIRST;
    sprinter_t *format = NULL;
    int opt_index, ret;
    output_t output = OUTPUT_SUMMARY;
    int offset = 0;
    int limit = -1; /* unlimited */
    int exclude = EXCLUDE_TRUE;
    unsigned int i;

    enum { NOTMUCH_FORMAT_JSON, NOTMUCH_FORMAT_TEXT }
	format_sel = NOTMUCH_FORMAT_TEXT;

    notmuch_opt_desc_t options[] = {
	{ NOTMUCH_OPT_KEYWORD, &sort, "sort", 's',
	  (notmuch_keyword_t []){ { "oldest-first", NOTMUCH_SORT_OLDEST_FIRST },
				  { "newest-first", NOTMUCH_SORT_NEWEST_FIRST },
				  { 0, 0 } } },
	{ NOTMUCH_OPT_KEYWORD, &format_sel, "format", 'f',
	  (notmuch_keyword_t []){ { "json", NOTMUCH_FORMAT_JSON },
				  { "text", NOTMUCH_FORMAT_TEXT },
				  { 0, 0 } } },
	{ NOTMUCH_OPT_KEYWORD, &output, "output", 'o',
	  (notmuch_keyword_t []){ { "summary", OUTPUT_SUMMARY },
				  { "threads", OUTPUT_THREADS },
				  { "messages", OUTPUT_MESSAGES },
				  { "files", OUTPUT_FILES },
				  { "tags", OUTPUT_TAGS },
				  { 0, 0 } } },
        { NOTMUCH_OPT_KEYWORD, &exclude, "exclude", 'x',
          (notmuch_keyword_t []){ { "true", EXCLUDE_TRUE },
                                  { "false", EXCLUDE_FALSE },
                                  { "flag", EXCLUDE_FLAG },
                                  { 0, 0 } } },
	{ NOTMUCH_OPT_INT, &offset, "offset", 'O', 0 },
	{ NOTMUCH_OPT_INT, &limit, "limit", 'L', 0  },
	{ 0, 0, 0, 0, 0 }
    };

    opt_index = parse_arguments (argc, argv, options, 1);

    if (opt_index < 0) {
	return 1;
    }

    switch (format_sel) {
    case NOTMUCH_FORMAT_TEXT:
	format = sprinter_text_create (ctx, stdout);
	break;
    case NOTMUCH_FORMAT_JSON:
	format = sprinter_json_create (ctx, stdout);
	break;
    default:
	/* this should never happen */
	INTERNAL_ERROR("no output format selected");
    }

    config = notmuch_config_open (ctx, NULL, NULL);
    if (config == NULL)
	return 1;

    if (notmuch_database_open (notmuch_config_get_database_path (config),
			       NOTMUCH_DATABASE_MODE_READ_ONLY, &notmuch))
	return 1;

    query_str = query_string_from_args (notmuch, argc-opt_index, argv+opt_index);
    if (query_str == NULL) {
	fprintf (stderr, "Out of memory.\n");
	return 1;
    }
    if (*query_str == '\0') {
	fprintf (stderr, "Error: notmuch search requires at least one search term.\n");
	return 1;
    }

    query = notmuch_query_create (notmuch, query_str);
    if (query == NULL) {
	fprintf (stderr, "Out of memory\n");
	return 1;
    }

    notmuch_query_set_sort (query, sort);

    if (exclude == EXCLUDE_FLAG && output != OUTPUT_SUMMARY) {
	/* If we are not doing summary output there is nowhere to
	 * print the excluded flag so fall back on including the
	 * excluded messages. */
	fprintf (stderr, "Warning: this output format cannot flag excluded messages.\n");
	exclude = EXCLUDE_FALSE;
    }

    if (exclude == EXCLUDE_TRUE || exclude == EXCLUDE_FLAG) {
	const char **search_exclude_tags;
	size_t search_exclude_tags_length;

	search_exclude_tags = notmuch_config_get_search_exclude_tags
	    (config, &search_exclude_tags_length);
	for (i = 0; i < search_exclude_tags_length; i++)
	    notmuch_query_add_tag_exclude (query, search_exclude_tags[i]);
	if (exclude == EXCLUDE_FLAG)
	    notmuch_query_set_omit_excluded (query, FALSE);
    }

    switch (output) {
    default:
    case OUTPUT_SUMMARY:
    case OUTPUT_THREADS:
	ret = do_search_threads (format, query, sort, output, offset, limit);
	break;
    case OUTPUT_MESSAGES:
    case OUTPUT_FILES:
	ret = do_search_messages (format, query, output, offset, limit);
	break;
    case OUTPUT_TAGS:
	ret = do_search_tags (notmuch, format, query);
	break;
    }

    notmuch_query_destroy (query);
    notmuch_database_destroy (notmuch);

    talloc_free (format);

    return ret;
}