#include "common/time.h"
#include "common/printing.h"
#include "common/jsonconfig.h"
#include "common/strutil.h"
#include "modules/datetime/datetime.h"

#include <time.h>

#pragma GCC diagnostic ignored "-Wformat" // warning: unknown conversion type character 'F' in format

#define FF_DATETIME_DISPLAY_NAME "Date & Time"

typedef struct FFDateTimeResult {
    // Examples for 21.02.2022 - 15:18:37
    uint16_t year;                                       // 2022
    uint8_t yearShort;                                   // 22
    uint8_t month;                                       // 2
    char monthPretty[FASTFETCH_STRBUF_DEFAULT_ALLOC];    // 02
    char monthName[FASTFETCH_STRBUF_DEFAULT_ALLOC];      // February
    char monthNameShort[FASTFETCH_STRBUF_DEFAULT_ALLOC]; // Feb
    uint8_t week;                                        // 8
    char weekday[FASTFETCH_STRBUF_DEFAULT_ALLOC];        // Monday
    char weekdayShort[FASTFETCH_STRBUF_DEFAULT_ALLOC];   // Mon
    uint16_t dayInYear;                                  // 52
    uint8_t dayInMonth;                                  // 21
    uint8_t dayInWeek;                                   // 1
    char dayPretty[FASTFETCH_STRBUF_DEFAULT_ALLOC];      // 01
    uint8_t hour;                                        // 15
    char hourPretty[FASTFETCH_STRBUF_DEFAULT_ALLOC];     // 15
    uint8_t hour12;                                      // 3
    char hour12Pretty[FASTFETCH_STRBUF_DEFAULT_ALLOC];   // 03
    uint8_t minute;                                      // 18
    char minutePretty[FASTFETCH_STRBUF_DEFAULT_ALLOC];   // 18
    uint8_t second;                                      // 37
    char secondPretty[FASTFETCH_STRBUF_DEFAULT_ALLOC];   // 37
    char offsetFromUtc[FASTFETCH_STRBUF_DEFAULT_ALLOC];
    char timezoneName[FASTFETCH_STRBUF_DEFAULT_ALLOC];
    char amPm[FASTFETCH_STRBUF_DEFAULT_ALLOC];
} FFDateTimeResult;

static void printDateTimeFormat(struct tm* tm, const FFModuleArgs* moduleArgs) {
    FFDateTimeResult result;

    result.year = (uint16_t) (tm->tm_year + 1900);
    result.yearShort = (uint8_t) (result.year % 100);
    result.month = (uint8_t) (tm->tm_mon + 1);
    strftime(result.monthPretty, sizeof(result.monthPretty), "%m", tm);
    strftime(result.monthName, sizeof(result.monthName), "%B", tm);
    strftime(result.monthNameShort, sizeof(result.monthNameShort), "%b", tm);
    result.week = (uint8_t) (tm->tm_yday / 7 + 1);
    strftime(result.weekday, sizeof(result.weekday), "%A", tm);
    strftime(result.weekdayShort, sizeof(result.weekdayShort), "%a", tm);
    result.dayInYear = (uint8_t) (tm->tm_yday + 1);
    result.dayInMonth = (uint8_t) tm->tm_mday;
    result.dayInWeek = tm->tm_wday == 0 ? 7 : (uint8_t) tm->tm_wday;
    strftime(result.dayPretty, sizeof(result.dayPretty), "%d", tm);
    result.hour = (uint8_t) tm->tm_hour;
    strftime(result.hourPretty, sizeof(result.hourPretty), "%H", tm);
    result.hour12 = (uint8_t) (result.hour % 12);
    strftime(result.hour12Pretty, sizeof(result.hour12Pretty), "%I", tm);
    result.minute = (uint8_t) tm->tm_min;
    strftime(result.minutePretty, sizeof(result.minutePretty), "%M", tm);
    result.second = (uint8_t) tm->tm_sec;
    strftime(result.secondPretty, sizeof(result.secondPretty), "%S", tm);
    strftime(result.offsetFromUtc, sizeof(result.offsetFromUtc), "%z", tm);
    strftime(result.timezoneName, sizeof(result.timezoneName), "%Z", tm);
    strftime(result.amPm, sizeof(result.amPm), "%p", tm);

    FF_PRINT_FORMAT_CHECKED(
        FF_DATETIME_DISPLAY_NAME,
        0,
        moduleArgs,
        FF_PRINT_TYPE_DEFAULT,
        ((FFformatarg[]){
            FF_ARG(result.year, "year"),                       // 1
            FF_ARG(result.yearShort, "year-short"),            // 2
            FF_ARG(result.month, "month"),                     // 3
            FF_ARG(result.monthPretty, "month-pretty"),        // 4
            FF_ARG(result.monthName, "month-name"),            // 5
            FF_ARG(result.monthNameShort, "month-name-short"), // 6
            FF_ARG(result.week, "week"),                       // 7
            FF_ARG(result.weekday, "weekday"),                 // 8
            FF_ARG(result.weekdayShort, "weekday-short"),      // 9
            FF_ARG(result.dayInYear, "day-in-year"),           // 10
            FF_ARG(result.dayInMonth, "day-in-month"),         // 11
            FF_ARG(result.dayInWeek, "day-in-week"),           // 12
            FF_ARG(result.hour, "hour"),                       // 13
            FF_ARG(result.hourPretty, "hour-pretty"),          // 14
            FF_ARG(result.hour12, "hour-12"),                  // 15
            FF_ARG(result.hour12Pretty, "hour-12-pretty"),     // 16
            FF_ARG(result.minute, "minute"),                   // 17
            FF_ARG(result.minutePretty, "minute-pretty"),      // 18
            FF_ARG(result.second, "second"),                   // 19
            FF_ARG(result.secondPretty, "second-pretty"),      // 20
            FF_ARG(result.offsetFromUtc, "offset-from-utc"),   // 21
            FF_ARG(result.timezoneName, "timezone-name"),      // 22
            FF_ARG(result.dayPretty, "day-pretty"),            // 23
            FF_ARG(result.amPm, "am-pm"),                      // 24
        }));
}

bool ffPrintDateTime(FFDateTimeOptions* options) {
    uint64_t msNow = ffTimeGetNow();
    time_t sNow = (time_t) (msNow / 1000);
    struct tm* tm = localtime(&sNow);

    if (options->moduleArgs.outputFormat.length > 0) {
        printDateTimeFormat(tm, &options->moduleArgs);
        return true;
    }

    char buffer[32];
    if (strftime(buffer, ARRAY_SIZE(buffer), "%F %T", tm) == 0) // yyyy-MM-dd HH:mm:ss
    {
        ffPrintError(FF_DATETIME_DISPLAY_NAME, 0, &options->moduleArgs, FF_PRINT_TYPE_DEFAULT, "strftime() failed");
        return false;
    }

    ffPrintLogoAndKey(FF_DATETIME_DISPLAY_NAME, 0, &options->moduleArgs, FF_PRINT_TYPE_DEFAULT);

    puts(buffer);
    return true;
}

void ffParseDateTimeJsonObject(FFDateTimeOptions* options, yyjson_val* module) {
    yyjson_val *key, *val;
    size_t idx, max;
    yyjson_obj_foreach (module, idx, max, key, val) {
        if (ffJsonConfigParseModuleArgs(key, val, &options->moduleArgs)) {
            continue;
        }

        ffPrintError(FF_DATETIME_DISPLAY_NAME, 0, &options->moduleArgs, FF_PRINT_TYPE_DEFAULT, "Unknown JSON key %s", unsafe_yyjson_get_str(key));
    }
}

void ffGenerateDateTimeJsonConfig(FFDateTimeOptions* options, yyjson_mut_doc* doc, yyjson_mut_val* module) {
    ffJsonConfigGenerateModuleArgsConfig(doc, module, &options->moduleArgs);
}

bool ffGenerateDateTimeJsonResult(FF_A_UNUSED FFDateTimeOptions* options, yyjson_mut_doc* doc, yyjson_mut_val* module) {
    yyjson_mut_obj_add_strcpy(doc, module, "result", ffTimeToFullStr(ffTimeGetNow()));
    return true;
}

void ffInitDateTimeOptions(FFDateTimeOptions* options) {
    ffOptionInitModuleArg(&options->moduleArgs, "");
}

void ffDestroyDateTimeOptions(FFDateTimeOptions* options) {
    ffOptionDestroyModuleArg(&options->moduleArgs);
}

FFModuleBaseInfo ffDateTimeModuleInfo = {
    .name = FF_DATETIME_MODULE_NAME,
    .description = "Print the current date and time",
    .initOptions = (void*) ffInitDateTimeOptions,
    .destroyOptions = (void*) ffDestroyDateTimeOptions,
    .parseJsonObject = (void*) ffParseDateTimeJsonObject,
    .printModule = (void*) ffPrintDateTime,
    .generateJsonResult = (void*) ffGenerateDateTimeJsonResult,
    .generateJsonConfig = (void*) ffGenerateDateTimeJsonConfig,
    .formatArgs = FF_FORMAT_ARG_LIST(((FFModuleFormatArg[]){
        { "Year", "year" },
        { "Last two digits of year", "year-short" },
        { "Month", "month" },
        { "Month with leading zero", "month-pretty" },
        { "Month name", "month-name" },
        { "Month name short", "month-name-short" },
        { "Week number on year", "week" },
        { "Weekday", "weekday" },
        { "Weekday short", "weekday-short" },
        { "Day in year", "day-in-year" },
        { "Day in month", "day-in-month" },
        { "Day in week", "day-in-week" },
        { "Hour", "hour" },
        { "Hour with leading zero", "hour-pretty" },
        { "Hour 12h format", "hour-12" },
        { "Hour 12h format with leading zero", "hour-12-pretty" },
        { "Minute", "minute" },
        { "Minute with leading zero", "minute-pretty" },
        { "Second", "second" },
        { "Second with leading zero", "second-pretty" },
        { "Offset from UTC in the ISO 8601 format", "offset-from-utc" },
        { "Locale-dependent timezone name or abbreviation", "timezone-name" },
        { "Day in month with leading zero", "day-pretty" },
        { "AM or PM", "am-pm" },
    }))
};
