import { expiringCacheExchange } from "./cache-exchange.js";
import {
    Client,
    setContextClient,
    fetchExchange,
} from "@urql/svelte";
import { setContext, getContext, hasContext, onDestroy, tick } from "svelte";
import { readable } from "svelte/store";

/*
 * Call this function only at component initialization time!
 *
 * It does several things:
 * - Initialize the GraphQL client
 * - Creates a readable store 'initialization' which indicates when the values below can be used.
 * - Adds 'tags' to the context (list of all tags)
 * - Adds 'clusters' to the context (object with cluster names as keys)
 * - Adds 'metrics' to the context, a function that takes a cluster and metric name and returns the MetricConfig (or undefined)
 */
export function init(extraInitQuery = "") {
    const jwt = hasContext("jwt")
        ? getContext("jwt")
        : getContext("cc-config")["jwt"];

    const client = new Client({
        url: `${window.location.origin}/query`,
        fetchOptions:
            jwt != null ? { headers: { Authorization: `Bearer ${jwt}` } } : {},
        exchanges: [
            expiringCacheExchange({
                ttl: 5 * 60 * 1000,
                maxSize: 150,
            }),
            fetchExchange,
        ],
    });

    setContextClient(client);

    const query = client
        .query(
            `query {
        clusters {
            name,
            metricConfig {
                name, unit { base, prefix }, peak,
                normal, caution, alert,
                timestep, scope,
                aggregation,
                subClusters { name, peak, normal, caution, alert, remove }
            }
            partitions
            subClusters {
                name, processorType
                socketsPerNode
                coresPerSocket
                threadsPerCore
                flopRateScalar { unit { base, prefix }, value }
                flopRateSimd { unit { base, prefix }, value }
                memoryBandwidth { unit { base, prefix }, value }
                numberOfNodes
                topology {
                    node, socket, core
                    accelerators { id }
                }
            }
        }
        tags { id, name, type }
        ${extraInitQuery}
    }`
        )
        .toPromise();

    let state = { fetching: true, error: null, data: null };
    let subscribers = [];
    const subscribe = (callback) => {
        callback(state);
        subscribers.push(callback);
        return () => {
            subscribers = subscribers.filter((cb) => cb != callback);
        };
    };

    const tags = [],
        clusters = [];
    setContext("tags", tags);
    setContext("clusters", clusters);
    setContext("metrics", (cluster, metric) => {
        if (typeof cluster !== "object")
            cluster = clusters.find((c) => c.name == cluster);

        return cluster.metricConfig.find((m) => m.name == metric);
    });
    setContext("on-init", (callback) =>
        state.fetching ? subscribers.push(callback) : callback(state)
    );
    setContext(
        "initialized",
        readable(false, (set) => subscribers.push(() => set(true)))
    );

    query.then(({ error, data }) => {
        state.fetching = false;
        if (error != null) {
            console.error(error);
            state.error = error;
            tick().then(() => subscribers.forEach((cb) => cb(state)));
            return;
        }

        for (let tag of data.tags) tags.push(tag);

        for (let cluster of data.clusters) clusters.push(cluster);

        state.data = data;
        tick().then(() => subscribers.forEach((cb) => cb(state)));
    });

    return {
        query: { subscribe },
        tags,
        clusters,
    };
}

export function formatNumber(x) {
    let suffix = "";
    if (x >= 1000000000) {
        x /= 1000000;
        suffix = "G";
    } else if (x >= 1000000) {
        x /= 1000000;
        suffix = "M";
    } else if (x >= 1000) {
        x /= 1000;
        suffix = "k";
    }

    return `${Math.round(x * 100) / 100} ${suffix}`;
}

// Use https://developer.mozilla.org/en-US/docs/Web/API/structuredClone instead?
export function deepCopy(x) {
    return JSON.parse(JSON.stringify(x));
}

function fuzzyMatch(term, string) {
    return string.toLowerCase().includes(term);
}

export function fuzzySearchTags(term, tags) {
    if (!tags) return [];

    let results = [];
    let termparts = term
        .split(":")
        .map((s) => s.trim())
        .filter((s) => s.length > 0);

    if (termparts.length == 0) {
        results = tags.slice();
    } else if (termparts.length == 1) {
        for (let tag of tags)
            if (
                fuzzyMatch(termparts[0], tag.type) ||
                fuzzyMatch(termparts[0], tag.name)
            )
                results.push(tag);
    } else if (termparts.length == 2) {
        for (let tag of tags)
            if (
                fuzzyMatch(termparts[0], tag.type) &&
                fuzzyMatch(termparts[1], tag.name)
            )
                results.push(tag);
    }

    return results.sort((a, b) => {
        if (a.type < b.type) return -1;
        if (a.type > b.type) return 1;
        if (a.name < b.name) return -1;
        if (a.name > b.name) return 1;
        return 0;
    });
}

export function groupByScope(jobMetrics) {
    let metrics = new Map();
    for (let metric of jobMetrics) {
        if (metrics.has(metric.name)) metrics.get(metric.name).push(metric);
        else metrics.set(metric.name, [metric]);
    }

    return [...metrics.values()].sort((a, b) =>
        a[0].name.localeCompare(b[0].name)
    );
}

const scopeGranularity = {
    node: 10,
    socket: 5,
    accelerator: 5,
    core: 2,
    hwthread: 1,
};

export function maxScope(scopes) {
    console.assert(
        scopes.length > 0 && scopes.every((x) => scopeGranularity[x] != null)
    );
    let sm = scopes[0],
        gran = scopeGranularity[scopes[0]];
    for (let scope of scopes) {
        let otherGran = scopeGranularity[scope];
        if (otherGran > gran) {
            sm = scope;
            gran = otherGran;
        }
    }
    return sm;
}

export function minScope(scopes) {
    console.assert(
        scopes.length > 0 && scopes.every((x) => scopeGranularity[x] != null)
    );
    let sm = scopes[0],
        gran = scopeGranularity[scopes[0]];
    for (let scope of scopes) {
        let otherGran = scopeGranularity[scope];
        if (otherGran < gran) {
            sm = scope;
            gran = otherGran;
        }
    }
    return sm;
}

export async function fetchMetrics(job, metrics, scopes) {
    if (job.monitoringStatus == 0) return null;

    let query = [];
    if (metrics != null) {
        for (let metric of metrics) {
            query.push(`metric=${metric}`);
        }
    }
    if (scopes != null) {
        for (let scope of scopes) {
            query.push(`scope=${scope}`);
        }
    }

    try {
        let res = await fetch(
            `/api/jobs/metrics/${job.id}${query.length > 0 ? "?" : ""}${query.join(
                "&"
            )}`
        );
        if (res.status != 200) {
            return { error: { status: res.status, message: await res.text() } };
        }

        return await res.json();
    } catch (e) {
        return { error: e };
    }
}

export function fetchMetricsStore() {
    let set = null;
    let prev = { fetching: true, error: null, data: null };
    return [
        readable(prev, (_set) => {
            set = _set;
        }),
        (job, metrics, scopes) =>
            fetchMetrics(job, metrics, scopes).then((res) => {
                let next = { fetching: false, error: res.error, data: res.data };
                if (prev.data && next.data)
                    next.data.jobMetrics.push(...prev.data.jobMetrics);

                prev = next;
                set(next);
            }),
    ];
}

export function stickyHeader(datatableHeaderSelector, updatePading) {
    const header = document.querySelector("header > nav.navbar");
    if (!header) return;

    let ticking = false,
        datatableHeader = null;
    const onscroll = (event) => {
        if (ticking) return;

        ticking = true;
        window.requestAnimationFrame(() => {
            ticking = false;
            if (!datatableHeader)
                datatableHeader = document.querySelector(datatableHeaderSelector);

            const top = datatableHeader.getBoundingClientRect().top;
            updatePading(
                top < header.clientHeight ? header.clientHeight - top + 10 : 10
            );
        });
    };

    document.addEventListener("scroll", onscroll);
    onDestroy(() => document.removeEventListener("scroll", onscroll));
}