import ScriptUtils from "./ScriptUtils"
import { readFileSync, writeFileSync } from "fs"
import { JsonSchema } from "../UI/Studio/jsonSchema"

function WalkScheme<T>(
    onEach: (schemePart: JsonSchema) => T,
    scheme: JsonSchema,
    fullScheme: JsonSchema & { definitions?: any } = undefined,
    path: string[] = [],
    isHandlingReference = []
): { path: string[]; t: T }[] {
    const results: { path: string[]; t: T }[] = []
    if (scheme === undefined) {
        return []
    }

    if (scheme["$ref"] !== undefined) {
        const ref = scheme["$ref"]
        const prefix = "#/definitions/"
        if (!ref.startsWith(prefix)) {
            throw "References is not relative!"
        }
        const definitionName = ref.substr(prefix.length)
        if (isHandlingReference.indexOf(definitionName) >= 0) {
            return []
        }
        const loadedScheme = fullScheme.definitions[definitionName]
        return WalkScheme(onEach, loadedScheme, fullScheme, path, [
            ...isHandlingReference,
            definitionName,
        ])
    }

    fullScheme = fullScheme ?? scheme
    let t = onEach(scheme)
    if (t !== undefined) {
        results.push({
            path,
            t,
        })
    }

    function walk(v: JsonSchema) {
        if (v === undefined) {
            return
        }
        results.push(...WalkScheme(onEach, v, fullScheme, path, isHandlingReference))
    }

    function walkEach(scheme: JsonSchema[]) {
        if (scheme === undefined) {
            return
        }

        scheme.forEach((v) => walk(v))
    }

    {
        walkEach(scheme.enum)
        walkEach(scheme.anyOf)
        walkEach(scheme.allOf)

        if (Array.isArray(scheme.items)) {
            walkEach(<any>scheme.items)
        } else {
            walk(<any>scheme.items)
        }

        for (const key in scheme.properties) {
            const prop = scheme.properties[key]
            results.push(
                ...WalkScheme(onEach, prop, fullScheme, [...path, key], isHandlingReference)
            )
        }
    }

    return results
}

function addMetafields(fieldnames: string[], fullSchema: JsonSchema) {
    return WalkScheme((schemePart) => {
        if (schemePart.description === undefined) {
            return
        }
        const type = schemePart.items?.anyOf ?? schemePart.type ?? schemePart.anyOf
        const hints = {}
        let description = schemePart.description.split("\n")
        for (const fieldname of fieldnames) {
            const hintIndex = description.findIndex((line) =>
                line
                    .trim()
                    .toLocaleLowerCase()
                    .startsWith(fieldname + ":")
            )
            if (hintIndex < 0) {
                continue
            }
            const hintLine = description[hintIndex].substring((fieldname + ":").length).trim()
            description.splice(hintIndex, 1)
            if (fieldname === "type") {
                hints["typehint"] = hintLine
            } else {
                hints[fieldname] = hintLine
            }
        }

        return { hints, type, description: description.join("\n") }
    }, fullSchema)
}

function extractMeta(typename: string, path: string) {
    let themeSchema: JsonSchema = JSON.parse(
        readFileSync("./Docs/Schemas/" + typename + ".schema.json", { encoding: "utf8" })
    )

    const metakeys = ["type", "group", "question", "ifunset"]

    const hints = addMetafields(metakeys, themeSchema)
    const paths = hints.map(({ path, t }) => ({ path, ...t }))

    themeSchema.required?.forEach((req) => {
        paths.filter((p) => p.path.at(-1) === req).forEach((meta) => (meta["required"] = true))
    })

    writeFileSync("./assets/" + path + ".json", JSON.stringify(paths, null, "  "))
    console.log("Written meta to ./assets/" + path)
}

function main() {
    const allSchemas = ScriptUtils.readDirRecSync("./Docs/Schemas").filter((pth) =>
        pth.endsWith("JSC.ts")
    )
    for (const path of allSchemas) {
        const dir = path.substring(0, path.lastIndexOf("/"))
        const name = path.substring(path.lastIndexOf("/"), path.length - "JSC.ts".length)
        let content = readFileSync(path, { encoding: "utf8" })
        content = content.substring("export default ".length)
        let parsed = JSON.parse(content)
        parsed["additionalProperties"] = false

        for (const key in parsed.definitions) {
            const def = parsed.definitions[key]
            if (def.type === "object") {
                def["additionalProperties"] = false
            }
        }
        writeFileSync(dir + "/" + name + ".schema.json", JSON.stringify(parsed, null, "  "), {
            encoding: "utf8",
        })
    }
    extractMeta("LayerConfigJson", "layerconfigmeta")
    extractMeta("LayoutConfigJson", "layoutconfigmeta")
    extractMeta("TagRenderingConfigJson", "tagrenderingconfigmeta")
    extractMeta("QuestionableTagRenderingConfigJson", "questionabletagrenderingconfigmeta")
}

main()