import {AllKnownLayouts} from "../Customizations/AllKnownLayouts";
import Locale from "../UI/i18n/Locale";
import {Translation} from "../UI/i18n/Translation";
import {readFileSync, writeFileSync} from "fs";
import LayoutConfig from "../Models/ThemeConfig/LayoutConfig";
import LayerConfig from "../Models/ThemeConfig/LayerConfig";
import Constants from "../Models/Constants";
import {Utils} from "../Utils";

/**
 * Generates all the files in "Docs/TagInfo". These are picked up by the taginfo project, showing a link to the mapcomplete theme if the key is used
 */

const outputDirectory = "Docs/TagInfo"

function generateTagOverview(kv: { k: string, v: string }, description: string): {
    key: string,
    description: string,
    value?: string
} {
    const overview = {
        // OSM tag key (required)
        key: kv.k,
        description: description,
        value: undefined
    };
    if (kv.v !== undefined) {
        // OSM tag value (optional, if not supplied it means "all values")
        overview.value = kv.v
    }
    return overview
}

function generateLayerUsage(layer: LayerConfig, layout: LayoutConfig): any [] {

    if (layer.name === undefined) {
        return [] // Probably a duplicate or irrelevant layer
    }

    const usedTags = layer.source.osmTags.asChange({})
    const result: {
        key: string,
        description: string,
        value?: string
    }[] = []
    for (const kv of usedTags) {
        const description = "The MapComplete theme " + layout.title.txt + " has a layer " + layer.name.txt + " showing features with this tag"
        result.push(generateTagOverview(kv, description))
    }

    for (const tr of layer.tagRenderings) {
        {
            const usesImageCarousel = (tr.render?.txt?.indexOf("image_carousel") ?? -2) > 0
            const usesImageUpload = (tr.render?.txt?.indexOf("image_upload") ?? -2) > 0

            if (usesImageCarousel || usesImageUpload) {

                const descrNoUpload = `The layer '${layer.name.txt} shows images based on the keys image, image:0, image:1,... and  wikidata, wikipedia, wikimedia_commons and mapillary`;
                const descrUpload = `The layer '${layer.name.txt} allows to upload images and adds them under the 'image'-tag (and image:0, image:1, ... for multiple images). Furhtermore, this layer shows images based on the keys image, wikidata, wikipedia, wikimedia_commons and mapillary`;

                const descr = usesImageUpload ? descrUpload : descrNoUpload;
                result.push(generateTagOverview({k: "image", v: undefined}, descr));
                result.push(generateTagOverview({k: "mapillary", v: undefined}, descr));
                result.push(generateTagOverview({k: "wikidata", v: undefined}, descr));
                result.push(generateTagOverview({k: "wikipedia", v: undefined}, descr));
            }
        }

        const q = tr.question?.txt;
        const key = tr.freeform?.key;
        if (key != undefined) {
            let descr = `Layer '${layer.name.txt}'`;
            if (q == undefined) {
                descr += " shows values with";
            } else {
                descr += " shows and asks freeform values for"
            }
            descr += ` key '${key}' (in the MapComplete.osm.be theme '${layout.title.txt}')`
            result.push(generateTagOverview({k: key, v: undefined}, descr))
        }

        const mappings = tr.mappings ?? []
        for (const mapping of mappings) {

            let descr = "Layer '" + layer.name.txt + "'";
            descr += " shows " + mapping.if.asHumanString(false, false, {}) + " with a fixed text, namely '" + mapping.then.txt + "'";
            if (q != undefined
                && mapping.hideInAnswer != true // != true will also match if a 
            ) {
                descr += " and allows to pick this as a default answer"
            }
            descr += ` (in the MapComplete.osm.be theme '${layout.title.txt}')`
            for (const kv of mapping.if.asChange({})) {
                let d = descr;
                if (q != undefined && kv.v == "") {
                    d = `${descr} Picking this answer will delete the key ${kv.k}.`
                }
                result.push(generateTagOverview(kv, d))
            }

        }
    }

    return result.filter(result => !result.key.startsWith("_"))
}

/**
 * Generates the JSON-object representing the theme for inclusion on taginfo
 * @param layout
 */
function generateTagInfoEntry(layout: LayoutConfig): any {
    const usedTags = []
    for (const layer of layout.layers) {
        if(Constants.priviliged_layers.indexOf(layer.id) >= 0){
            continue
        }
        if(layer.source.geojsonSource !== undefined && layer.source.isOsmCacheLayer !== true){
            continue
        }
        usedTags.push(...generateLayerUsage(layer, layout))
    }
    
    if(usedTags.length == 0){
        return undefined
    }


    let icon = layout.icon;
    if (icon.startsWith("./")) {
        icon = icon.substring(2)
    }

    const themeInfo = {
        // data format version, currently always 1, will get updated if there are incompatible changes to the format (required)
        "data_format": 1,
        // timestamp when project file was updated is not given as it pollutes the github history
        "project": {
            "name": "MapComplete " + layout.title.txt,          // name of the project (required)
            "description": layout.shortDescription.txt,   // short description of the project (required)
            "project_url": "https://mapcomplete.osm.be/" + layout.id,   // home page of the project with general information (required)
            "doc_url": "https://github.com/pietervdvn/MapComplete/tree/master/assets/themes/",       // documentation of the project and especially the tags used (optional)
            "icon_url": "https://mapcomplete.osm.be/" + icon,      // project logo, should work in 16x16 pixels on white and light gray backgrounds (optional)
            "contact_name": "Pieter Vander Vennet",  // contact name, needed for taginfo maintainer (required)
            "contact_email": "pietervdvn@posteo.net"  // contact email, needed for taginfo maintainer (required)
        },
        tags: usedTags
    }

    const filename = "mapcomplete_" + layout.id
    console.log("Writing info about " + layout.id)
    writeFileSync(`${outputDirectory}/${filename}.json`, JSON.stringify(themeInfo, null, 2))
    return filename
}

// Write the URLS to the taginfo repository. Might fail if the repository is not checked ou
function generateProjectsOverview(files: string[]) {
    try {
        const tagInfoList = "../taginfo-projects/project_list.txt"
        let projectList = readFileSync(tagInfoList, "UTF8")
            .split("\n")
            .filter(entry => entry.indexOf("mapcomplete_") < 0)
            .concat(files.map(f => `${f} https://raw.githubusercontent.com/pietervdvn/MapComplete/develop/Docs/TagInfo/${f}.json`))
            .sort()
            .filter(entry => entry != "")

        console.log("Writing taginfo project filelist");
        writeFileSync(tagInfoList, projectList.join("\n") + "\n");


    } catch (e) {
        console.warn("Could not write the taginfo-projects list - the repository is probably not checked out. Are you creating a fork? Ignore this message then.")
    }

}


function main(){
    

console.log("Creating taginfo project files")

Locale.language.setData("en")
Translation.forcedLanguage = "en"

    const files = []
    
    for (const layout of AllKnownLayouts.layoutsList) {
        if (layout.hideFromOverview) {
            continue;
        }
        files.push(generateTagInfoEntry(layout));
    }
    generateProjectsOverview(Utils.NoNull(files));
}

main()