import { FastifyInstance } from "fastify"
import multipart from "@fastify/multipart"
import { s3 } from "../utils/s3"
import {GetObjectCommand, PutObjectCommand} from "@aws-sdk/client-s3"
import {getSignedUrl} from "@aws-sdk/s3-request-presigner";
import archiver from "archiver"
import {secrets} from "../utils/secrets"

export default async function fileRoutes(server: FastifyInstance) {
    await server.register(multipart,{
        limits: {
            fileSize: 20 * 1024 * 1024, // 20 MB
        }
    })

    server.post("/files/upload", async (req, reply) => {
        const tenantId = req.user?.tenant_id
        if (!tenantId) return reply.code(401).send({ error: "Unauthorized" })

        const data:any = await req.file()
        const fileBuffer = await data.toBuffer()

        console.log(data)


        let meta = JSON.parse(data.fields?.meta?.value)

        if (!data.file) return reply.code(400).send({ error: "No file uploaded" })


        const {data:createdFileData,error:createdFileError} = await server.supabase
            .from("files")
            .insert({
                tenant: tenantId,
            })
            .select()
            .single()

        if(createdFileError) {
            console.log(createdFileError)
            return reply.code(500).send({ error: "Internal Server Error" })
        } else if(createdFileData && data.file) {
            const fileKey = `${tenantId}/filesbyid/${createdFileData.id}/${data.filename}`

            await s3.send(new PutObjectCommand({
                Bucket: secrets.S3_BUCKET,
                Key: fileKey,
                Body: fileBuffer,
                ContentType: data.mimetype,
            }))

            //Update File with Corresponding Path
            const {data:updateFileData, error:updateFileError} = await server.supabase
                .from("files")
                .update({
                    ...meta,
                    path: fileKey,
                })
                .eq("id", createdFileData.id)

            if(updateFileError) {
                console.log(updateFileError)
                return reply.code(500).send({ error: "Internal Server Error" })

            } else {
                /*const {data:tagData, error:tagError} = await server.supabase
                    .from("filetagmembers")
                    .insert(tags.map(tag => {
                        return {
                            file_id: createdFileData.id,
                            tag_id: tag
                        }
                    }))*/

                return { id: createdFileData.id, filename: data.filename, path: fileKey }

            }

        }
    })

    server.get("/files/:id?", async (req, reply) => {
        const { id } = req.params as { id?: string }

        if(id) {
            try {
                const {data,error} = await server.supabase.from("files").select("*").eq("id", id).single()

                return {...data}
            } catch (err) {
                req.log.error(err);
                reply.code(500).send({ error: "Could not generate presigned URL" });
            }
        } else {
            try {
                const {data:supabaseFileEntries,error} = await server.supabase.from("files").select("*, createddocument(*, customer(*))").eq("tenant",req.user.tenant_id)



                return { files: supabaseFileEntries }
            } catch (err) {
                req.log.error(err)
                reply.code(500).send({ error: "Could not generate presigned URLs" })
            }
        }

    })

    server.post("/files/download/:id?", async (req, reply) => {
        const { id } = req.params as { id?: string }

        // @ts-ignore
        const ids = req.body?.ids || []


        try {
            if (id) {
                // 🔹 Einzeldownload
                const { data, error } = await server.supabase
                    .from("files")
                    .select("*")
                    .eq("id", id)
                    .single()

                if (error || !data) {
                    return reply.code(404).send({ error: "File not found" })
                }

                const command = new GetObjectCommand({
                    Bucket: secrets.S3_BUCKET,
                    Key: data.path,
                })

                const { Body, ContentType } = await s3.send(command)

                const chunks: any[] = []
                // @ts-ignore
                for await (const chunk of Body) {
                    chunks.push(chunk)
                }
                const buffer = Buffer.concat(chunks)

                reply.header("Content-Type", ContentType || "application/octet-stream")
                reply.header(
                    "Content-Disposition",
                    `attachment; filename="${data.path.split("/").pop()}"`
                )
                return reply.send(buffer)
            }

            console.log(ids)

            if (Array.isArray(ids) && ids.length > 0) {
                // 🔹 Multi-Download → ZIP zurückgeben
                const { data: supabaseFiles, error } = await server.supabase
                    .from("files")
                    .select("*")
                    .in("id", ids)

                if (error || !supabaseFiles?.length) {
                    return reply.code(404).send({ error: "Files not found" })
                }

                console.log(supabaseFiles)

                reply.header("Content-Type", "application/zip")
                reply.header("Content-Disposition", "attachment; filename=dateien.zip")

                const archive = archiver("zip", { zlib: { level: 9 } })
                archive.on("warning", console.warn)

                for (const entry of supabaseFiles) {
                    const command = new GetObjectCommand({
                        Bucket: secrets.S3_BUCKET,
                        Key: entry.path,
                    })

                    const { Body } = await s3.send(command)
                    const filename = entry.path.split("/").pop() || entry.id
                    console.log(filename)
                    archive.append(Body as any, { name: filename })
                }

                await archive.finalize()
                return reply.send(archive)
            }

            return reply.code(400).send({ error: "No id or ids provided" })
        } catch (err) {
            console.log(err)
            reply.code(500).send({ error: "Download failed" })
        }
    })

    server.post("/files/presigned/:id?", async (req, reply) => {
        const { id } = req.params as { id: string };
        const { ids } = req.body as { ids: string[] }

        if(id) {
            try {
                const {data,error} = await server.supabase.from("files").select("*").eq("id", id).single()

                const command = new GetObjectCommand({
                    Bucket: secrets.S3_BUCKET,
                    Key: data.path,
                });

                // URL für 15 Minuten gültig
                const url = await getSignedUrl(s3, command, { expiresIn: 900 });

                return { ...data, url };
            } catch (err) {
                req.log.error(err);
                reply.code(500).send({ error: "Could not generate presigned URL" });
            }
        } else {
            if (!Array.isArray(ids) || ids.length === 0) {
                return reply.code(400).send({ error: "No file keys provided" })
            }

            try {
                const {data:supabaseFileEntries,error} = await server.supabase.from("files").select("*, createddocument(*, customer(*))").eq("tenant",req.user.tenant_id).is("archived",false)

                console.log(error)

                let filteredFiles = supabaseFileEntries.filter(i => ids.includes(i.id))
                filteredFiles = filteredFiles.filter(i => i.path)

                console.log(filteredFiles.filter(i => !i.path))



                let urls = await Promise.all(
                    ids.map(async (id) => {
                        let file = filteredFiles.find(i  => i.id === id)

                        if(!file) return

                        let key = file.path
                        if(!key) console.log(file)

                        const command = new GetObjectCommand({
                            Bucket: secrets.S3_BUCKET,
                            Key: key,
                        })

                        const url = await getSignedUrl(s3, command, { expiresIn: 900 }) // 15 min gültig


                        return {...filteredFiles.find(i => i.id === id), url}
                    })
                )

                urls = urls.filter(i => i)

                return { files: urls }
            } catch (err) {
                console.log(err)
                reply.code(500).send({ error: "Could not generate presigned URLs" })
            }
        }


    })
}