/* eslint-disable @typescript-eslint/camelcase */
import { AuthMethod, Policy } from "anastasis-core";
import { h, VNode } from "preact";
import { useState } from "preact/hooks";
import { useAnastasisContext } from "../../context/anastasis";
import { authMethods, KnownAuthMethods } from "./authMethod";
import { AnastasisClientFrame } from "./index";

export interface ProviderInfo {
  url: string;
  cost: string;
  isFree: boolean;
}

export type ProviderInfoByType = {
  [type in KnownAuthMethods]?: ProviderInfo[];
};

interface Props {
  index: number;
  cancel: () => void;
  confirm: (changes: MethodProvider[]) => void;

}

export interface MethodProvider {
  authentication_method: number;
  provider: string;
}

export function EditPoliciesScreen({ index: policy_index, cancel, confirm }: Props): VNode {
  const [changedProvider, setChangedProvider] = useState<Array<string>>([])

  const reducer = useAnastasisContext()
  if (!reducer) {
    return <div>no reducer in context</div>
  }
  if (!reducer.currentReducerState || reducer.currentReducerState.backup_state === undefined) {
    return <div>invalid state</div>
  }

  const selectableProviders: ProviderInfoByType = {}
  const allProviders = Object.entries(reducer.currentReducerState.authentication_providers || {})
  for (let index = 0; index < allProviders.length; index++) {
    const [url, status] = allProviders[index]
    if ("methods" in status) {
      status.methods.map(m => {
        const type: KnownAuthMethods = m.type as KnownAuthMethods
        const values = selectableProviders[type] || []
        const isFree = !m.usage_fee || m.usage_fee.endsWith(":0")
        values.push({ url, cost: m.usage_fee, isFree })
        selectableProviders[type] = values
      })
    }
  }

  const allAuthMethods = reducer.currentReducerState.authentication_methods ?? [];
  const policies = reducer.currentReducerState.policies ?? [];
  const policy = policies[policy_index]
  
  for(let method_index = 0; method_index < allAuthMethods.length; method_index++ ) {
    policy?.methods.find(m => m.authentication_method === method_index)?.provider
  }

  function sendChanges(): void {
    const newMethods: MethodProvider[] = []
    allAuthMethods.forEach((method, index) => {
      const oldValue = policy?.methods.find(m => m.authentication_method === index)
      if (changedProvider[index] === undefined && oldValue !== undefined) {
        newMethods.push(oldValue)
      }
      if (changedProvider[index] !== undefined && changedProvider[index] !== "") {
        newMethods.push({
          authentication_method: index,
          provider: changedProvider[index]
        })
      }
    })
    confirm(newMethods)
  }

  return <AnastasisClientFrame hideNav title={!policy ? "Backup: New Policy" : "Backup: Edit Policy"}>
    <section class="section">
      {!policy ? <p>
        Creating a new policy #{policy_index}
      </p> : <p>
        Editing policy #{policy_index}
      </p>}
      {allAuthMethods.map((method, index) => {
        //take the url from the updated change or from the policy
        const providerURL = changedProvider[index] === undefined ? 
          policy?.methods.find(m => m.authentication_method === index)?.provider : 
          changedProvider[index];

        const type: KnownAuthMethods = method.type as KnownAuthMethods
        function changeProviderTo(url: string): void {
          const copy = [...changedProvider]
          copy[index] = url
          setChangedProvider(copy)
        }
        return (
          <div key={index} class="block" style={{ display: 'flex', alignItems: 'center' }}>
            <span class="icon">
              {authMethods[type]?.icon}
            </span>
            <span>
              {method.instructions}
            </span>
            <span>
              <span class="select " >
                <select onChange={(e) => changeProviderTo(e.currentTarget.value)} value={providerURL ?? ""}>
                  <option key="none" value=""> &lt;&lt; off &gt;&gt; </option>
                  {selectableProviders[type]?.map(prov => (
                    <option key={prov.url} value={prov.url}>
                      {prov.url}
                    </option>
                  ))}
                </select>
              </span>
            </span>
          </div>
        );
      })}
      <div style={{ marginTop: '2em', display: 'flex', justifyContent: 'space-between' }}>
        <button class="button" onClick={cancel}>Cancel</button>
        <span class="buttons">
          <button class="button" onClick={() => setChangedProvider([])}>Reset</button>
          <button class="button is-info" onClick={sendChanges}>Confirm</button>
        </span>
      </div>
    </section>
  </AnastasisClientFrame>
}