import React, { FormEvent, useMemo, useState } from 'react';
import { useAsync } from 'react-use';

import { DataFrameJSON, SelectableValue } from '@grafana/data';
import { InlineField, InlineFieldRow, InlineSwitch, Input, Label, Select } from '@grafana/ui';

import { EditorProps } from '../QueryEditor';
import { SimulationQuery } from '../dataquery';

import { SimulationSchemaForm } from './SimulationSchemaForm';

// Type         string      `json:"type"`
// Name         string      `json:"name"`
// Description  string      `json:"description"`
// OnlyForward  bool        `json:"forward"`
// ConfigFields *data.Frame `json:"config"`

interface SimInfo {
  type: string;
  name: string;
  description: string;
  forward: boolean;
  config: DataFrameJSON;
}

export const SimulationQueryEditor = ({ onChange, query, ds }: EditorProps) => {
  const simQuery = query.sim ?? ({} as SimulationQuery);
  const simKey = simQuery.key ?? {};
  // keep track of updated config state to pass down to form
  const [cfgValue, setCfgValue] = useState<Record<string, any>>({});

  // This only changes once
  const info = useAsync(async () => {
    const v = await ds.getResource<SimInfo[]>('sims');
    return {
      sims: v,
      options: v.map((s) => ({ label: s.name, value: s.type, description: s.description })),
    };
  }, [ds]);

  const current = useMemo(() => {
    const type = simKey.type;
    if (!type || !info.value) {
      return {};
    }
    return {
      details: info.value.sims.find((v) => v.type === type),
      option: info.value.options.find((v) => v.value === type),
    };
  }, [info.value, simKey?.type]);

  let config = useAsync(async () => {
    let path = simKey.type + '/' + simKey.tick + 'hz';
    if (simKey.uid) {
      path += '/' + simKey.uid;
    }
    let config = (await ds.getResource('sim/' + path))?.config;
    setCfgValue(config.value);
    return config;
  }, [simKey.type, simKey.tick, simKey.uid]);

  const onUpdateKey = (key: typeof simQuery.key) => {
    onChange({ ...query, sim: { ...simQuery, key } });
  };

  const onUIDChanged = (e: FormEvent<HTMLInputElement>) => {
    const { value } = e.currentTarget;
    onUpdateKey({ ...simKey, uid: value ?? undefined });
  };

  const onTickChanged = (e: FormEvent<HTMLInputElement>) => {
    const tick = e.currentTarget.valueAsNumber;
    onUpdateKey({ ...simKey, tick });
  };

  const onTypeChange = (v: SelectableValue<string>) => {
    onUpdateKey({ ...simKey, type: v.value! });
  };

  const onToggleStream = () => {
    onChange({ ...query, sim: { ...simQuery, stream: !simQuery.stream } });
  };

  const onToggleLast = () => {
    onChange({ ...query, sim: { ...simQuery, last: !simQuery.last } });
  };

  const onSchemaFormChange = (config: Record<string, any>) => {
    let path = simKey.type + '/' + simKey.tick + 'hz';
    if (simKey.uid) {
      path += '/' + simKey.uid;
    }
    ds.postResource<SimInfo>('sim/' + path, config).then((res) => {
      setCfgValue(res.config);
    });
  };
  return (
    <>
      <InlineFieldRow>
        <InlineField labelWidth={14} label="Simulation" tooltip="">
          <Select
            isLoading={info.loading}
            options={info.value?.options ?? []}
            value={current.option}
            onChange={onTypeChange}
            width={32}
          />
        </InlineField>
      </InlineFieldRow>
      <InlineFieldRow>
        <InlineField labelWidth={14} label="Stream" tooltip="connect to the live channel">
          <InlineSwitch value={Boolean(simQuery.stream)} onChange={onToggleStream} />
        </InlineField>

        <InlineField label="Interval" tooltip="the rate a simulation will spit out events">
          <Input
            width={10}
            type="number"
            value={simKey.tick}
            onChange={onTickChanged}
            min={1 / 10}
            max={50}
            suffix="hz"
          />
        </InlineField>

        <InlineField label="Last" tooltip="Only return the last value">
          <Label>
            <InlineSwitch value={Boolean(simQuery.last)} onChange={onToggleLast} />
          </Label>
        </InlineField>
        <InlineField label="UID" tooltip="A UID will allow multiple simulations to run at the same time">
          <Input type="text" placeholder="optional" value={simQuery.key.uid} onChange={onUIDChanged} />
        </InlineField>
      </InlineFieldRow>
      <SimulationSchemaForm
        onChange={onSchemaFormChange}
        config={cfgValue ?? config.value}
        schema={current.details?.config.schema ?? { fields: [] }}
      />
    </>
  );
};
