import { createEffect, onCleanup } from "solid-js";
import { createStore } from "solid-js/store";
import { RecordModel, RecordSubscription } from "pocketbase";
import * as pbf from "@nedpals/pbf";
import { z } from "zod";
import { nanoid } from "nanoid";

import { usePB } from "./context.js";

interface IUseRecordOptions {
   realtime?: boolean;
   validator?: z.AnyZodObject;
   expand?: string[];
}

export function useRecord<T>(collection: string, id: () => string, options?: IUseRecordOptions) {
   const pb = usePB();
   const requestKey = nanoid();

   const [record, setRecord] = createStore<{
      loading: boolean,
      record: T & RecordModel | null,
      error: Error | null,
   }>({
      loading: true,
      error: null,
      record: null,
   });

   const v = options?.validator ?? ({ parse: (i) => id });

   createEffect(() => {
      const cid = id();

      const setRecordChecked: typeof setRecord = (...args) => {
         if (cid !== id()) return;
         (setRecord as any)(...args);
      }

      setRecordChecked("loading", () => true)
      setRecordChecked("error", () => null)
      pb.collection(collection).getOne(cid, {
         expand: options?.expand ? options.expand.join(",") : undefined,
         requestKey,
      }).then((value) => {
         setRecordChecked("record", () => v.parse(value) as T & RecordModel)
      }).catch((error) => {
         setRecordChecked("error", () => error as Error)
      }).finally(() => {
         setRecordChecked("loading", () => false)
      });

      const sub = pb.realtime.subscribe(collection + "/" + cid, (value) => {
         //TODO: Check what actions exist and if some needs special handling
         setRecordChecked("record", () => v.parse(value.record) as T & RecordModel)
      }, {
         query: {
            expand: options?.expand ? options.expand.join(",") : undefined,
            requestKey: requestKey + "-rt",
         }
      });

      sub.catch(err => { console.error("Error in realtime subscription", err) });

      onCleanup(() => {
         pb.cancelRequest(requestKey);
         pb.cancelRequest(requestKey + "-rt");
         sub.then(s => s());
      });
   })

   return record;
}

interface IUseRecordsOptions {
   realtime?: boolean;
   validator?: z.AnyZodObject;
   filter?: () => pbf.MaybeFilter<pbf.Filter> | undefined,
   expand?: string[];
}

export function useRecords<T>(collection: string, options: IUseRecordsOptions = { expand: [] }) {
   const pb = usePB();
   const requestKey = nanoid();

   const fstr = () => options.filter && options.filter() ? pbf.stringify(options.filter()) : undefined;
   const v = options.validator ?? ({ parse: (i) => i });

   const [records, setRecords] = createStore<{
      loading: boolean,
      records: (T & RecordModel)[],
      error: Error | null,
   }>({
      records: [],
      loading: true,
      error: null,
   });

   createEffect(() => {
      const cf = fstr();

      const setRecordChecked: typeof setRecords = (...args) => {
         if (cf !== fstr()) return;
         (setRecords as any)(...args);
      }

      setRecordChecked("loading", () => true)
      setRecordChecked("error", () => null)

      pb.collection(collection).getFullList({
         requestKey,
         filter: cf,
         expand: options?.expand ? options.expand.join(",") : undefined,
      }).then((values) => {
         setRecordChecked("records", () => values.map(value => v.parse(value) as T & RecordModel))
      }).catch((error) => {
         setRecordChecked("error", () => error as Error)
      }).finally(() => {
         setRecordChecked("loading", () => false)
      });

      const sub = pb.realtime.subscribe(collection, (event: RecordSubscription<T & RecordModel>) => {
         console.log("Event", event);
         const rec = v.parse(event.record) as T & RecordModel;
         switch (event.action) {
            case "create":
               setRecordChecked("records", (records) => [...records, rec]);
               break;

            case "update":
               setRecordChecked("records", (records) => records.map(r => r.id === rec.id ? rec : r));
               break;

            case "delete":
               setRecordChecked("records", (records) => records.filter(r => r.id !== rec.id));
               break;

            default:
               console.log("Unknown action", event.action);
         }
      }, {
         requestKey: requestKey + "-rt",
         query: {
            filter: cf,
            expand: options?.expand ? options.expand.join(",") : undefined,
         }
      });

      sub.then(unsub => { console.log("Subscribed to realtime changes!"); });
      sub.catch(err => { console.error("Error in realtime subscription", err) });

      onCleanup(() => {
         pb.cancelRequest(requestKey);
         pb.cancelRequest(requestKey + "-rt");
         sub.then(s => s());
      });
   })

   return records;
}