/*
 * cnhelp - Display cnotes command reference
 */

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

void print_overview(void) {
    printf("cnotes - Command-line note-taking system\n");
    printf("\n");
    printf("Commands:\n");
    printf("  cnadd    Add a new note entry\n");
    printf("  cndump   Display all notes\n");
    printf("  cnfind   Search notes\n");
    printf("  cncount  Show statistics\n");
    printf("  cndel    Archive (delete) notes\n");
    printf("  cnhelp   This help message\n");
    printf("\n");
    printf("Use 'cnhelp <command>' for details on a specific command.\n");
}

void print_cnadd(void) {
    printf("cnadd - Add a new timestamped note entry\n");
    printf("\n");
    printf("Usage: cnadd [-c CATEGORY] \"message\"\n");
    printf("\n");
    printf("Options:\n");
    printf("  -c CATEGORY  Set category (max 10 chars, default: General)\n");
    printf("\n");
    printf("Examples:\n");
    printf("  cnadd \"Remember to call Bob\"\n");
    printf("  cnadd -c Work \"Meeting at 3pm\"\n");
}

void print_cndump(void) {
    printf("cndump - Display all notes in a formatted table\n");
    printf("\n");
    printf("Usage: cndump [-d] [-c] [-r] [-a]\n");
    printf("\n");
    printf("Options:\n");
    printf("  -d, --date      Sort by date/time (newest first)\n");
    printf("  -c, --category  Sort by category\n");
    printf("  -r, --reverse   Reverse sort order\n");
    printf("  -a, --archive   Show archived entries\n");
    printf("\n");
    printf("Examples:\n");
    printf("  cndump           Display all notes\n");
    printf("  cndump -d        Sort by date\n");
    printf("  cndump -a        Show archived notes\n");
}

void print_cnfind(void) {
    printf("cnfind - Search notes by text, category, or date\n");
    printf("\n");
    printf("Usage: cnfind [-c CAT] [-d DATE] [-i] [-n] [-a] [PATTERN]\n");
    printf("\n");
    printf("Options:\n");
    printf("  -c CATEGORY  Filter by category\n");
    printf("  -d DATE      Filter by date (YYYY-MM-DD)\n");
    printf("  -i           Case-sensitive search\n");
    printf("  -n           Show only match count\n");
    printf("  -a, --archive  Search archived entries\n");
    printf("\n");
    printf("Examples:\n");
    printf("  cnfind meeting       Search for 'meeting'\n");
    printf("  cnfind -c Work       Show Work category\n");
    printf("  cnfind -a meeting    Search archive\n");
}

void print_cncount(void) {
    printf("cncount - Display note statistics\n");
    printf("\n");
    printf("Usage: cncount [-c] [-d] [-a]\n");
    printf("\n");
    printf("Options:\n");
    printf("  -c, --category  Count by category\n");
    printf("  -d, --date      Count by date\n");
    printf("  -a, --archive   Count archived entries\n");
    printf("\n");
    printf("Examples:\n");
    printf("  cncount          Total count\n");
    printf("  cncount -c       Count per category\n");
    printf("  cncount -a -c    Archived by category\n");
}

void print_cndel(void) {
    printf("cndel - Archive (soft-delete) note entries\n");
    printf("\n");
    printf("Usage: cndel -n LINE | -d DATE | -l [-y]\n");
    printf("\n");
    printf("Options:\n");
    printf("  -n LINE   Archive entry at line number\n");
    printf("  -d DATE   Archive all entries on date (YYYY-MM-DD)\n");
    printf("  -l        Archive the last entry\n");
    printf("  -y        Skip confirmation\n");
    printf("\n");
    printf("Notes are moved to cnotes.arc, not permanently deleted.\n");
    printf("Use cnfind to get line numbers.\n");
    printf("\n");
    printf("Examples:\n");
    printf("  cndel -n 5       Archive line 5\n");
    printf("  cndel -l -y      Archive last entry (no prompt)\n");
}

int main(int argc, char *argv[]) {
    if (argc < 2) {
        print_overview();
        return 0;
    }

    if (strcmp(argv[1], "cnadd") == 0 || strcmp(argv[1], "add") == 0) {
        print_cnadd();
    }
    else if (strcmp(argv[1], "cndump") == 0 || strcmp(argv[1], "dump") == 0) {
        print_cndump();
    }
    else if (strcmp(argv[1], "cnfind") == 0 || strcmp(argv[1], "find") == 0) {
        print_cnfind();
    }
    else if (strcmp(argv[1], "cncount") == 0 || strcmp(argv[1], "count") == 0) {
        print_cncount();
    }
    else if (strcmp(argv[1], "cndel") == 0 || strcmp(argv[1], "del") == 0) {
        print_cndel();
    }
    else if (strcmp(argv[1], "-h") == 0 || strcmp(argv[1], "--help") == 0) {
        print_overview();
    }
    else {
        fprintf(stderr, "cnhelp: unknown command '%s'\n", argv[1]);
        fprintf(stderr, "Available: cnadd, cndump, cnfind, cncount, cndel\n");
        return 1;
    }

    return 0;
}