<!-- (C) 2022 - ntop.org     -->
<template>
    <div class="input-group">
        <div class="form-group">
            <div class="controls">
                <div class="btn-group me-auto btn-group-sm flex-wrap d-flex">
                    <slot name="begin"></slot>
                    <div>
                      <select-search :disabled="disabled_date_picker"
                        v-model:selected_option="selected_time_option" :id="'time_preset_range_picker'"
                            :options="time_preset_list_filtered" @select_option="change_select_time(null)">
                        </select-search>
                    </div>
                    <div class="btn-group ms-2">
                        <span class="input-group-text">
                            <i class="fas fa-calendar-alt"></i>
                        </span>
                        <input :disabled="disabled_date_picker" class="flatpickr flatpickr-input form-control" type="text" placeholder="Choose a date.."
                            data-id="datetime" ref="begin-date" style="width:10rem;">
                        <!-- <input ref="begin-date" @change="enable_apply=true" @change="change_begin_date" type="date" class="date_time_input begin-timepicker form-control border-right-0 fix-safari-input"> -->
                        <!-- <input ref="begin-time" @change="enable_apply=true" type="time" class="date_time_input begin-timepicker form-control border-right-0 fix-safari-input"> -->
                        <span class="input-group-text">
                            <i class="fas fa-long-arrow-alt-right"></i>
                        </span>
                        <input :disabled="disabled_date_picker" class="flatpickr flatpickr-input form-control" type="text" placeholder="Choose a date.."
                            data-id="datetime" ref="end-date" style="width:10rem;">
                        <!-- <input ref="end-date" @change="enable_apply=true" type="date" class="date_time_input end-timepicker form-control border-left-0 fix-safari-input" style="width: 2.5rem;"> -->
                        <!-- <input ref="end-time" @change="enable_apply=true" type="time" class="date_time_input end-timepicker form-control border-left-0 fix-safari-input"> -->
                        <span v-show="wrong_date || wrong_min_interval" :title="invalid_date_message" style="margin-left:0.2rem;color:red;">
                            <i class="fas fa-exclamation-circle"></i>
                        </span>
                    </div>

                    <div class="d-flex align-items-center ms-2">
                        <button :disabled="!enable_apply || wrong_date || wrong_min_interval" @click="apply" type="button" class="btn btn-sm btn-primary">{{
                            i18n('apply') }}</button>

                        <div class="btn-group">
                            <button :disabled="disabled_date_picker" @click="jump_time_back()" type="button" class="btn btn-sm btn-link" ref="btn-jump-time-back"
                                :title="i18n('date_time_range_picker.btn_move_left')">
                                <i class="fas fa-long-arrow-alt-left"></i>
                            </button>
                            <button :disabled="disabled_date_picker" @click="jump_time_ahead()" type="button" class="btn btn-sm btn-link me-2" ref="btn-jump-time-ahead"
                                :title="i18n('date_time_range_picker.btn_move_right')">
                                <i class="fas fa-long-arrow-alt-right"></i>
                            </button>
                            <button :disabled="disabled_date_picker" @click="zoom(2)" type="button" class="btn btn-sm btn-link" ref="btn-zoom-in"
                                :title="i18n('date_time_range_picker.btn_zoom_in')">
                                <i class="fas fa-search-plus"></i>
                            </button>
                            <button :disabled="disabled_date_picker" @click="zoom(0.5)" type="button" class="btn btn-sm btn-link" ref="btn-zoom-out"
                                :title="i18n('date_time_range_picker.btn_zoom_out')">
                                <i class="fas fa-search-minus"></i>
                            </button>
                            <button :disabled="history_last_status == null || disabled_date_picker" type="button" @click="apply_status_by_history()"
                                class="btn btn-sm btn-link" :title="i18n('date_time_range_picker.btn_undo')">
                                <i class="fas fa-undo"></i>
                            </button>
                            <button :disabled="select_time_value == 'custom' || disabled_date_picker" @click="change_select_time()"
                                type="button" class="btn btn-sm btn-link" :title="i18n('date_time_range_picker.btn_refresh')">
                                <i class="fas fa-sync"></i>
                            </button>
                            <slot name="extra_buttons"></slot>
                        </div>
                    </div>
                </div>
            </div>
        </div>
    </div>
</template>

<script>
import { default as SelectSearch } from "./select-search.vue";
import { ntopng_utility, ntopng_url_manager, ntopng_events_manager } from "../services/context/ntopng_globals_services";

export default {
    components: {
        'select-search': SelectSearch,
    },
    props: {
        id: String,
        enable_refresh: Boolean,
        disabled_date_picker: Boolean,
        min_time_interval_id: String,
	    round_time: Boolean, //if min_time_interval_id != null round time by min_time_interval_id
        custom_time_interval_list: Array,
    },
    computed: {
        // a computed getter
        invalid_date_message: function () {
            if (this.wrong_date) {
                return this.i18n('wrong_date_range');
            }
            else if (this.wrong_min_interval) {
                let msg = this.i18n('wrong_min_interval');
                msg.replace('%time_interval', this.i18n(`show_alerts.presets.${this.min_time_interval_id}`));

                return msg
            }
        }
    },
    watch: {
        "enable_refresh": function (val, oldVal) {
            if (val == true) {
                this.start_refresh();
            } else if (this.refresh_interval != null) {
                clearInterval(this.refresh_interval);
                this.refresh_interval = null;
            }
        },
        "min_time_interval_id": function () {
          // todo
        },
        "round_time": function () {
          // todo
        },
    },
    emits: ["epoch_change"],
    /** This method is the first method of the component called, it's called before html template creation. */
    created() {
    },
    beforeMount() {
        if (this.$props.custom_time_interval_list != null) {
            this.time_preset_list = this.$props.custom_time_interval_list;
        }
        // filter interval
        if (this.min_time_interval_id == null) {
            this.time_preset_list_filtered = this.time_preset_list;
            return;
        }
	const timeframes_dict = this.get_timeframes_available();
	const min_time_interval = timeframes_dict[this.min_time_interval_id];
        this.time_preset_list_filtered = this.time_preset_list.filter((elem) => {
            if (elem.value == "custom") {
                return true;
            }
            return min_time_interval == null || timeframes_dict[elem.value] >= min_time_interval;
        });
    },
    /** This method is the first method called after html template creation. */
    mounted() {
        let epoch_begin = ntopng_url_manager.get_url_entry("epoch_begin");
        let epoch_end = ntopng_url_manager.get_url_entry("epoch_end");
        if (epoch_begin != null && epoch_end != null) {
            // update the status

            this.emit_epoch_change({ epoch_begin: Number.parseInt(epoch_begin), epoch_end: Number.parseInt(epoch_end) }, this.$props.id, true);
        }
        let me = this;
        let f_set_picker = (picker, var_name) => {
            return flatpickr($(this.$refs[picker]), {
                enableTime: true,
                dateFormat: "d/m/Y H:i",
                //altInput: true,
                //dateFormat: "YYYY-MM-DD HH:mm",
                //altFormat: "d-m-Y H:i",
                //locale: "it",
                time_24hr: true,
                clickOpens: true,
                //mode: "range",
                //static: true,
                onChange: function (selectedDates, dateStr, instance) {
                    me.enable_apply = true;
                    me.wrong_date = me.flat_begin_date.selectedDates[0].getTime() > me.flat_end_date.selectedDates[0].getTime();
                    me.wrong_min_interval = me.min_time_interval_id && me.get_utc_seconds((me.flat_end_date.selectedDates[0].getTime() - me.flat_begin_date.selectedDates[0].getTime()) < ntopng_utility.get_timeframe_from_timeframe_id(me.min_time_interval_id));
                    //me.a[data] = d;
                },
            });
        };
        this.flat_begin_date = f_set_picker("begin-date", "begin_date");
        this.flat_end_date = f_set_picker("end-date", "end_date");
        ntopng_events_manager.on_event_change(this.$props.id, ntopng_events.EPOCH_CHANGE, (new_status) => this.on_status_updated(new_status), true);

        // notifies that component is ready
        //console.log(this.$props["id"]);
        ntopng_sync.ready(this.$props["id"]);
        if (this.enable_refresh) {
            this.start_refresh();
        }
    },

    /** Methods of the component. */
    methods: {
        start_refresh: function () {
            this.refresh_interval = setInterval(() => {
                let value = this.selected_time_option?.value;
                if (this.enable_refresh && value != null && value != "custom") {
                    this.update_from_interval = true;
                    this.change_select_time(true);
                }
            }, this.refresh_interval_seconds * 1000);
            // }, 10* 1000);
        },
        utc_s_to_server_date: function (utc_seconds) {
            let utc = utc_seconds * 1000;
            let d_local = new Date(utc);
            let local_offset = d_local.getTimezoneOffset();
            let server_offset = moment.tz(utc, ntop_zoneinfo)._offset;
            let offset_minutes = server_offset + local_offset;
            let offset_ms = offset_minutes * 1000 * 60;
            var d_server = new Date(utc + offset_ms);
            return d_server;
        },
        server_date_to_date: function (date, format) {
            let utc = date.getTime();
            let local_offset = date.getTimezoneOffset();
            let server_offset = moment.tz(utc, ntop_zoneinfo)._offset;
            let offset_minutes = server_offset + local_offset;
            let offset_ms = offset_minutes * 1000 * 60;
            var d_local = new Date(utc - offset_ms);
            return d_local;
        },
        on_status_updated: function (status) {
            let end_date_time_utc = Date.now();
            // default begin date time now - 30 minutes
            let begin_date_time_utc = end_date_time_utc - 30 * 60 * 1000;
            if (status.epoch_end != null && status.epoch_begin != null
                && Number.parseInt(status.epoch_end) > Number.parseInt(status.epoch_begin)) {
                status.epoch_begin = Number.parseInt(status.epoch_begin);
                status.epoch_end = Number.parseInt(status.epoch_end);
                end_date_time_utc = status.epoch_end * 1000;
                begin_date_time_utc = status.epoch_begin * 1000;
            } else {
                status.epoch_end = this.get_utc_seconds(end_date_time_utc);
                status.epoch_begin = this.get_utc_seconds(begin_date_time_utc);
                ntopng_url_manager.add_obj_to_url(status);
                this.emit_epoch_change(status, this.$props.id);
            }
            // this.flat_begin_date.setDate(new Date(status.epoch_begin * 1000));
            // this.flat_end_date.setDate(new Date(status.epoch_end * 1000));
            this.flat_begin_date.setDate(this.utc_s_to_server_date(status.epoch_begin));
            this.flat_end_date.setDate(this.utc_s_to_server_date(status.epoch_end));
            // this.set_date_time("begin-date", begin_date_time_utc, false);
            // this.set_date_time("begin-time", begin_date_time_utc, true);
            // this.set_date_time("end-date", end_date_time_utc, false);
            // this.set_date_time("end-time", end_date_time_utc, true);
            this.set_select_time_value(begin_date_time_utc, end_date_time_utc);
            this.epoch_status = { epoch_begin: status.epoch_begin, epoch_end: status.epoch_end };
            if (this.update_from_interval == false) {
                this.add_status_in_history(this.epoch_status);
            }
            this.enable_apply = false;
            this.update_from_interval = false;
            ntopng_url_manager.add_obj_to_url(this.epoch_status);
        },
        set_select_time_value: function (begin_utc, end_utc) {
            const timeframes_dict = this.get_timeframes_available();
            const tolerance = 60;
            let now = this.get_utc_seconds(Date.now());
	    if (this.round_time == true && this.min_time_interval_id != null) {
		now = this.round_time_by_min_interval(now)
	    }
            const end_utc_s = this.get_utc_seconds(end_utc);
            const begin_utc_s = this.get_utc_seconds(begin_utc);
	    
            if (this.is_between(end_utc_s, now, tolerance)) {
		this.select_time_value = null;
		for (let time_id in timeframes_dict) {
		    if (this.is_between(begin_utc_s, now - timeframes_dict[time_id], tolerance)) {
			this.select_time_value = time_id;
		    }
		}
                if (this.select_time_value == null) {
                    this.select_time_value = "custom";
                }
            } else {
                this.select_time_value = "custom";
            }

            this.time_preset_list_filtered.forEach(element => {
                element.currently_active = false
                if (element.value == this.select_time_value) {
                    this.selected_time_option = element;
                    element.currently_active = true;
                }
            });
        },
        apply: function () {
            // let date_begin = this.$refs["begin-date"].valueAsDate;
            // let d_time_begin = this.$refs["begin-time"].valueAsDate;
            // date_begin.setHours(d_time_begin.getHours());
            // date_begin.setMinutes(d_time_begin.getMinutes() + d_time_begin.getTimezoneOffset());
            // date_begin.setSeconds(d_time_begin.getSeconds());

            // let date_end = this.$refs["end-date"].valueAsDate;
            // let d_time_end = this.$refs["end-time"].valueAsDate;
            // date_end.setHours(d_time_end.getHours());
            // date_end.setMinutes(d_time_end.getMinutes() + d_time_end.getTimezoneOffset());
            // date_end.setSeconds(d_time_end.getSeconds());
            // let epoch_begin = this.get_utc_seconds(date_begin.valueOf());
            // let epoch_end = this.get_utc_seconds(date_end.valueOf());
            let now_s = this.get_utc_seconds(Date.now());
            let begin_date = this.server_date_to_date(this.flat_begin_date.selectedDates[0]);
            let epoch_begin = this.get_utc_seconds(begin_date.getTime());
            let end_date = this.server_date_to_date(this.flat_end_date.selectedDates[0]);
            let epoch_end = this.get_utc_seconds(end_date.getTime());
            if (epoch_end > now_s) {
                epoch_end = now_s;
            }
            let status = { epoch_begin, epoch_end };
            this.emit_epoch_change(status);
        },
        // set_date_time: function(ref_name, utc_ts, is_time) {
        //     utc_ts = this.get_utc_seconds(utc_ts) * 1000;        
        //     let date_time = new Date(utc_ts);
        //     date_time.setMinutes(date_time.getMinutes() - date_time.getTimezoneOffset());
        //     if (is_time) {
        // 	this.$refs[ref_name].value = date_time.toISOString().substring(11,16);
        //     } else {
        // 	this.$refs[ref_name].value = date_time.toISOString().substring(0,10);
        //     }
        // },
        change_select_time: function (refresh_data) {
            let s_values = this.get_timeframes_available();
            let interval_s = s_values[this.selected_time_option.value];
            let epoch_end = this.get_utc_seconds(Date.now());
            let epoch_begin = epoch_end - interval_s;
            let status = { epoch_begin: epoch_begin, epoch_end: epoch_end, refresh_data };
            this.emit_epoch_change(status);
        },
        get_timeframes_available: function () {
	    const timeframes_dict = ntopng_utility.get_timeframes_dict();
            const timeframes_ids = this.time_preset_list.map((ts) => ts.value);
	    let timeframes_available = {};
	    timeframes_ids.forEach((tf_id) => {
		timeframes_available[tf_id] = timeframes_dict[tf_id];
	    });
	    return timeframes_available;
        },
        get_utc_seconds: function (utc_ms) {
	    return ntopng_utility.get_utc_seconds(utc_ms);
        },
        is_between: function (x, y, tolerance) {
            return x >= y - tolerance && x <= y;
        },
        zoom: function (scale) {
            if (this.epoch_status == null) { return; }
            let interval = (this.epoch_status.epoch_end - this.epoch_status.epoch_begin) / scale;
            let center = (this.epoch_status.epoch_end / 2 + this.epoch_status.epoch_begin / 2);
            this.epoch_status.epoch_begin = center - interval / 2;
            this.epoch_status.epoch_end = center + interval / 2;
            let now = this.get_utc_seconds(Date.now());
            if (this.epoch_status.epoch_end > now) {
                this.epoch_status.epoch_end = now;
            }
            this.epoch_status.epoch_end = Number.parseInt(this.epoch_status.epoch_end);
            this.epoch_status.epoch_begin = Number.parseInt(this.epoch_status.epoch_begin);
            if (this.epoch_status.epoch_begin == this.epoch_status.epoch_end) {
                this.epoch_status.epoch_begin -= 2;
            }
            this.emit_epoch_change(this.epoch_status);
        },
        jump_time_back: function () {
            if (this.epoch_status == null) { return; }
            const min = 60;
            this.epoch_status.epoch_begin -= (30 * min);
            this.epoch_status.epoch_end -= (30 * min);
            this.emit_epoch_change(this.epoch_status);
        },
        jump_time_ahead: function () {
            if (this.epoch_status == null) { return; }
            const min = 60;
            let previous_end = this.epoch_status.epoch_end;
            let now = this.get_utc_seconds(Date.now());

            this.epoch_status.epoch_end += (30 * min);
            if (this.epoch_status.epoch_end > now) {
                this.epoch_status.epoch_end = now;
            }
            this.epoch_status.epoch_begin += (this.epoch_status.epoch_end - previous_end);
            this.emit_epoch_change(this.epoch_status);
        },
        emit_epoch_change: function (epoch_status, id, emit_only_global_event) {
            if (epoch_status.epoch_end == null || epoch_status.epoch_begin == null) { return; };
            this.wrong_date = false;
            if (epoch_status.epoch_begin > epoch_status.epoch_end) {
                this.wrong_date = true;
                return;
            }
	    if (this.min_time_interval_id && this.round_time == true) {
		epoch_status.epoch_begin = this.round_time_by_min_interval(epoch_status.epoch_begin);
		epoch_status.epoch_end = this.round_time_by_min_interval(epoch_status.epoch_end);
	    }

            if (id != this.id) {
                this.on_status_updated(epoch_status);
            }
            ntopng_events_manager.emit_event(ntopng_events.EPOCH_CHANGE, epoch_status, this.id);
	    if (emit_only_global_event) {
		return;
	    }
            this.$emit("epoch_change", epoch_status);
        },
	round_time_by_min_interval: function(ts) {
	    return ntopng_utility.round_time_by_timeframe_id(ts, this.min_time_interval_id);
	},
        add_status_in_history: function (epoch_status) {
            this.history_last_status = this.history[this.history.length - 1];
            if (this.history.length > 5) {
                this.history.shift();
            }
            this.history.push(epoch_status);
        },

        apply_status_by_history: function () {
            if (this.history_last_status == null) { return; }
            this.history.pop();
            this.history.pop();
            this.emit_epoch_change(this.history_last_status);
        },
    },
    /**
       Private date of vue component.
    */
    data() {
        return {
            i18n: (t) => i18n(t),
            //status_id: "date-time-range-picker" + this.$props.id,
            epoch_status: null,
            refresh_interval: null,
            refresh_interval_seconds: 60,
            update_from_interval: false,
            history: [],
            history_last_status: null,
            enable_apply: false,
            select_time_value: "5_min",
            selected_time_option: { value: "5_min", label: i18n('show_alerts.presets.5_min'), currently_active: false },
            wrong_date: false,
            wrong_min_interval: false,
            flat_begin_date: null,
            flat_end_date: null,
            time_preset_list: [
                { value: "5_min", label: i18n('show_alerts.presets.5_min'), currently_active: false },
                { value: "10_min", label: i18n('show_alerts.presets.10_min'), currently_active: false },
                { value: "30_min", label: i18n('show_alerts.presets.30_min'), currently_active: true },
                { value: "hour", label: i18n('show_alerts.presets.hour'), currently_active: false },
                { value: "2_hours", label: i18n('show_alerts.presets.2_hours'), currently_active: false },
                { value: "6_hours", label: i18n('show_alerts.presets.6_hours'), currently_active: false },
                { value: "12_hours", label: i18n('show_alerts.presets.12_hours'), currently_active: false },
                { value: "day", label: i18n('show_alerts.presets.day'), currently_active: false },
                { value: "week", label: i18n('show_alerts.presets.week'), currently_active: false },
                { value: "month", label: i18n('show_alerts.presets.month'), currently_active: false },
                { value: "year", label: i18n('show_alerts.presets.year'), currently_active: false },
                { value: "custom", label: i18n('show_alerts.presets.custom'), currently_active: false, disabled: true, },
            ],
            time_preset_list_filtered: [],
        };
    },
}

</script>

<style scoped>
.date_time_input {
    width: 10.5rem;
    max-width: 10.5rem;
    min-width: 10.5rem;
}
</style>
