#include "interactive.h"

#include <ctype.h>

static void interactive_skip_spaces(const char **cursor) {
    while (**cursor != '\0' && isspace((unsigned char) **cursor)) {
        (*cursor)++;
    }
}

int interactive_parse_command(const char *line, interactive_command_t *command, char *err, size_t err_len) {
    const char *cursor = line;
    char action[16];
    size_t action_len = 0;
    size_t to_len = 0;
    size_t value_len;

    if (line == NULL || command == NULL) {
        snprintf(err, err_len, "interactive: invalid command");
        return -1;
    }
    memset(command, 0, sizeof(*command));
    interactive_skip_spaces(&cursor);
    while (*cursor != '\0' && !isspace((unsigned char) *cursor) && action_len + 1 < sizeof(action)) {
        action[action_len++] = *cursor++;
    }
    action[action_len] = '\0';
    if (action_len == 0) {
        snprintf(err, err_len, "interactive: empty command");
        return -1;
    }
    if (strcmp(action, "help") == 0) {
        command->type = INTERACTIVE_CMD_HELP;
        return 0;
    }
    if (strcmp(action, "quit") == 0) {
        command->type = INTERACTIVE_CMD_QUIT;
        return 0;
    }

    interactive_skip_spaces(&cursor);
    while (*cursor != '\0' && !isspace((unsigned char) *cursor) && to_len + 1 < sizeof(command->to)) {
        command->to[to_len++] = *cursor++;
    }
    command->to[to_len] = '\0';
    interactive_skip_spaces(&cursor);
    if (command->to[0] == '\0' || *cursor == '\0') {
        snprintf(err, err_len, "interactive: missing target or value");
        return -1;
    }

    value_len = strlen(cursor);
    if (value_len >= sizeof(command->value)) {
        snprintf(err, err_len, "interactive: value too long");
        return -1;
    }
    snprintf(command->value, sizeof(command->value), "%s", cursor);

    if (strcmp(action, "text") == 0) {
        command->type = INTERACTIVE_CMD_TEXT;
        return 0;
    }
    if (strcmp(action, "file") == 0) {
        command->type = INTERACTIVE_CMD_FILE;
        return 0;
    }
    snprintf(err, err_len, "interactive: unknown command %s", action);
    return -1;
}

void interactive_print_help(FILE *out, const char *transport_name) {
    fprintf(out, "interactive mode commands (%s):\n", transport_name);
    fprintf(out, "  help                    show this help\n");
    fprintf(out, "  text <peer> <message>   send one text message\n");
    fprintf(out, "  file <peer> <path>      send one file\n");
    fprintf(out, "  quit                    exit this process\n");
}