import Script from "./Script"
import { appendFileSync, readFileSync, writeFile, writeFileSync } from "fs"
import { ChangeDescription } from "../src/Logic/Osm/Actions/ChangeDescription"
import { Changes } from "../src/Logic/Osm/Changes"
import { OsmObject } from "../src/Logic/Osm/OsmObject"
import OsmObjectDownloader from "../src/Logic/Osm/OsmObjectDownloader"
import { OsmConnection } from "../src/Logic/Osm/OsmConnection"
import { ImmutableStore } from "../src/Logic/UIEventSource"
import Constants from "../src/Models/Constants"

type ErrorMessage = {
    ip: string
    index: number
    date: string
    message: {
        stacktrace: string
        message: string
        layout: string
        version: string
        language: string
        username: string
        userid: number
        pendingChanges: ChangeDescription[]
    }
}

class HandleErrors extends Script {
    constructor() {
        super("Inspects the errors made on a given day. Argument: path to errors")
    }

    private readonly ignoreUsers = new Set<string>([])

    private async handleError(parsed: ErrorMessage, changesObj: Changes, downloader: OsmObjectDownloader, createdChangesets: Set<string>, refusedFiles: Set<string>) {
        console.log(
            parsed.message.username,
            parsed.message.layout,
            parsed.message.message,
            parsed.date,
        )

        const e = parsed.message
        const neededIds = Changes.GetNeededIds(e.pendingChanges)
        // We _do not_ pass in the Changes object itself - we want the data from OSM directly in order to apply the changes
        const osmObjects: { id: string; osmObj: OsmObject | "deleted" }[] = await Promise.all<{
            id: string
            osmObj: OsmObject | "deleted"
        }>(
            neededIds.map(async (id) => {
                try {

                    const osmObj = await downloader.DownloadObjectAsync(id)
                    return ({
                        id,
                        osmObj,
                    })
                } catch (e) {
                    console.error("COULD NOT DOWNLOAD OBJECT", id)
                    return {
                        id,
                        osmObj: "deleted",
                    }
                }
            }),
        )

        const objects = osmObjects
            .filter((obj) => obj.osmObj !== "deleted")
            .map((obj) => <OsmObject>obj.osmObj)

        const { toUpload, refused } = changesObj.fragmentChanges(e.pendingChanges, objects)

        const changes: {
            newObjects: OsmObject[]
            modifiedObjects: OsmObject[]
            deletedObjects: OsmObject[]
        } = changesObj.CreateChangesetObjects(toUpload, objects, true)

        const changeset = Changes.buildChangesetXML("", changes)
        const path =
            "error_changeset_" + parsed.index + "_" + e.layout + "_" + e.username + ".osc"
        if (
            changeset ===
            `<osmChange version='0.6' generator='Mapcomplete ${Constants.vNumber}'></osmChange>`
        ) {
            /*console.log(
                "Changes for " + parsed.index + ": empty changeset, not creating a file for it"
            )*/
        } else if (createdChangesets.has(changeset)) {
            /* console.log(
                "Changeset " +
                    parsed.index +
                    " is identical to previously seen changeset, not writing to file"
            )*/
        } else {
            const changesetWithMsg = `<!-- User: ${parsed.message.username} (${parsed.message.userid}) ${parsed.message.layout}; Version ${parsed.message.version}; Not uploaded due to ${parsed.message.message} -->
${changeset}`
            writeFileSync(path, changesetWithMsg, "utf8")
            createdChangesets.add(changeset)
            console.log("Written", path, "with " + e.pendingChanges.length + " changes")
        }
        const refusedContent = JSON.stringify(refused)
        if (refusedFiles.has(refusedContent)) {
            /* console.log(
                "Refused changes for " +
                    parsed.index +
                    " is identical to previously seen changeset, not writing to file"
            )*/
        } else {
            writeFileSync(path + ".refused.json", refusedContent, "utf8")
            refusedFiles.add(refusedContent)
            console.log("Written refused", path)
        }
    }

    async main(args: string[]): Promise<void> {
        const osmConnection = new OsmConnection()
        const downloader = new OsmObjectDownloader(osmConnection.Backend(), undefined)

        const path = args[0]
        const lines = readFileSync(path, "utf8").split("\n")

        const createdChangesets = new Set<string>()
        const refusedFiles: Set<string> = new Set<string>()
        refusedFiles.add("[]")

        const changesObj = new Changes(
            {
                dryRun: new ImmutableStore(true),
                osmConnection,
            },
            false,
            (err) => console.error(err),
        )

        const all: ErrorMessage[] = []
        for (const line of lines) {
            if (!line?.trim()) {
                continue
            }
            try {
                const parsed: ErrorMessage = JSON.parse(line)
                const e = parsed.message
                if (e.layout === "grb") {
                    console.log("Skipping GRB ")
                    continue
                }
                if (this.ignoreUsers.has(e.username)) {
                    continue
                }
                for (const pendingChange of e.pendingChanges) {
                    console.log(
                        "\t https://osm.org/" + pendingChange.type + "/" + pendingChange.id,
                        pendingChange.meta.changeType,
                        pendingChange.doDelete ? "DELETE" : "",
                    )
                }
                all.push(parsed)
            } catch (e) {
                console.log("Parsing line failed:", e)
            }
        }

        for (const parsed of all) {
            try {
                await this.handleError(parsed, changesObj, downloader, createdChangesets, refusedFiles)
            } catch (e) {
                console.error("ERROR: could not handle ", parsed, " due to", e)
                writeFileSync("ERRORS."+parsed.index, "ERROR: due to " + e + ": could not handle\n" + JSON.stringify(parsed), "utf8")
            }
        }
    }
}

new HandleErrors().run()