<template>
    <div :class="$style.root">
        <MkFolder class="item">
            <template #header>Chart</template>
            <div :class="$style.chart">
                <div class="selects">
                    <MkSelect v-model="chartSrc" style="margin: 0; flex: 1">
                        <optgroup :label="i18n.ts.federation">
                            <option value="federation">
                                {{ i18n.ts._charts.federation }}
                            </option>
                            <option value="ap-request">
                                {{ i18n.ts._charts.apRequest }}
                            </option>
                        </optgroup>
                        <optgroup :label="i18n.ts.users">
                            <option value="users">
                                {{ i18n.ts._charts.usersIncDec }}
                            </option>
                            <option value="users-total">
                                {{ i18n.ts._charts.usersTotal }}
                            </option>
                            <option value="active-users">
                                {{ i18n.ts._charts.activeUsers }}
                            </option>
                        </optgroup>
                        <optgroup :label="i18n.ts.notes">
                            <option value="notes">
                                {{ i18n.ts._charts.notesIncDec }}
                            </option>
                            <option value="local-notes">
                                {{ i18n.ts._charts.localNotesIncDec }}
                            </option>
                            <option value="remote-notes">
                                {{ i18n.ts._charts.remoteNotesIncDec }}
                            </option>
                            <option value="notes-total">
                                {{ i18n.ts._charts.notesTotal }}
                            </option>
                        </optgroup>
                        <optgroup :label="i18n.ts.drive">
                            <option value="drive-files">
                                {{ i18n.ts._charts.filesIncDec }}
                            </option>
                            <option value="drive">
                                {{ i18n.ts._charts.storageUsageIncDec }}
                            </option>
                        </optgroup>
                    </MkSelect>
                    <MkSelect v-model="chartSpan" style="margin: 0 0 0 10px">
                        <option value="hour">{{ i18n.ts.perHour }}</option>
                        <option value="day">{{ i18n.ts.perDay }}</option>
                    </MkSelect>
                </div>
                <div class="chart _panel">
                    <MkChart
                        :src="chartSrc"
                        :span="chartSpan"
                        :limit="chartLimit"
                        :detailed="true"
                    ></MkChart>
                </div>
            </div>
        </MkFolder>

        <MkFolder class="item">
            <template #header>Active users heatmap</template>
            <MkSelect v-model="heatmapSrc" style="margin: 0 0 12px 0">
                <option value="active-users">Active users</option>
                <option value="notes">Posts</option>
                <option value="ap-requests-inbox-received">
                    Fediverse Requests: inboxReceived
                </option>
                <option value="ap-requests-deliver-succeeded">
                    Fediverse Requests: deliverSucceeded
                </option>
                <option value="ap-requests-deliver-failed">
                    Fediverse Requests: deliverFailed
                </option>
            </MkSelect>
            <div class="_panel" :class="$style.heatmap">
                <MkHeatmap :src="heatmapSrc" />
            </div>
        </MkFolder>

        <MkFolder class="item">
            <template #header>Federation</template>
            <div :class="$style.federation">
                <div class="pies">
                    <div class="sub">
                        <div class="title">Sub</div>
                        <canvas ref="subDoughnutEl"></canvas>
                    </div>
                    <div class="pub">
                        <div class="title">Pub</div>
                        <canvas ref="pubDoughnutEl"></canvas>
                    </div>
                </div>
            </div>
        </MkFolder>
    </div>
</template>

<script lang="ts" setup>
import { onMounted, ref, shallowRef } from "vue";
import { Chart } from "chart.js";
import MkSelect from "@/components/form/select.vue";
import MkChart from "@/components/MkChart.vue";
import { useChartTooltip } from "@/scripts/use-chart-tooltip";
import * as os from "@/os";
import { i18n } from "@/i18n";
import MkHeatmap from "@/components/MkHeatmap.vue";
import MkFolder from "@/components/MkFolder.vue";
import { initChart } from "@/scripts/init-chart";

initChart();

const chartLimit = 500;
let chartSpan = ref<"hour" | "day">("hour");
let chartSrc = ref("active-users");
let heatmapSrc = ref("active-users");
let subDoughnutEl = shallowRef<HTMLCanvasElement>();
let pubDoughnutEl = shallowRef<HTMLCanvasElement>();

const { handler: externalTooltipHandler1 } = useChartTooltip({
    position: "middle",
});
const { handler: externalTooltipHandler2 } = useChartTooltip({
    position: "middle",
});

function createDoughnut(chartEl, tooltip, data) {
    const chartInstance = new Chart(chartEl, {
        type: "doughnut",
        data: {
            labels: data.map((x) => x.name),
            datasets: [
                {
                    backgroundColor: data.map((x) => x.color),
                    borderColor: getComputedStyle(
                        document.documentElement,
                    ).getPropertyValue("--panel"),
                    borderWidth: 2,
                    hoverOffset: 0,
                    data: data.map((x) => x.value),
                },
            ],
        },
        options: {
            maintainAspectRatio: false,
            layout: {
                padding: {
                    left: 16,
                    right: 16,
                    top: 16,
                    bottom: 16,
                },
            },
            onClick: (ev) => {
                const hit = chartInstance.getElementsAtEventForMode(
                    ev,
                    "nearest",
                    { intersect: true },
                    false,
                )[0];
                if (hit && data[hit.index].onClick) {
                    data[hit.index].onClick();
                }
            },
            plugins: {
                legend: {
                    display: false,
                },
                tooltip: {
                    enabled: false,
                    mode: "index",
                    animation: {
                        duration: 0,
                    },
                    external: tooltip,
                },
            },
        },
    });

    return chartInstance;
}

onMounted(() => {
    os.apiGet("federation/stats", { limit: 30 }).then((fedStats) => {
        createDoughnut(
            subDoughnutEl.value,
            externalTooltipHandler1,
            fedStats.topSubInstances
                .map((x) => ({
                    name: x.host,
                    color: x.themeColor,
                    value: x.followersCount,
                    onClick: () => {
                        os.pageWindow(`/instance-info/${x.host}`);
                    },
                }))
                .concat([
                    {
                        name: "(other)",
                        color: "#80808080",
                        value: fedStats.otherFollowersCount,
                    },
                ]),
        );

        createDoughnut(
            pubDoughnutEl.value,
            externalTooltipHandler2,
            fedStats.topPubInstances
                .map((x) => ({
                    name: x.host,
                    color: x.themeColor,
                    value: x.followingCount,
                    onClick: () => {
                        os.pageWindow(`/instance-info/${x.host}`);
                    },
                }))
                .concat([
                    {
                        name: "(other)",
                        color: "#80808080",
                        value: fedStats.otherFollowingCount,
                    },
                ]),
        );
    });
});
</script>

<style lang="scss" module>
.root {
    &:global {
        > .item {
            margin-bottom: 16px;
        }
    }
}

.chart {
    &:global {
        > .selects {
            display: flex;
            margin-bottom: 12px;
        }

        > .chart {
            padding: 16px;
        }
    }
}

.heatmap {
    padding: 16px;
    margin-bottom: 16px;
}

.retention {
    padding: 16px;
    margin-bottom: 16px;
}

.federation {
    &:global {
        > .pies {
            display: flex;
            gap: 16px;

            > .sub,
            > .pub {
                flex: 1;
                min-width: 0;
                position: relative;
                background: var(--panel);
                border-radius: var(--radius);
                padding: 24px;
                max-height: 300px;

                > .title {
                    position: absolute;
                    top: 24px;
                    left: 24px;
                }
            }

            @media (max-width: 600px) {
                flex-direction: column;
            }
        }
    }
}
</style>
