import type { Folder, HttpRequest } from "@yaakapp-internal/models";
import { foldersAtom, httpRequestsAtom } from "@yaakapp-internal/models";
import type {
  FormInput,
  FormInputCheckbox,
  FormInputEditor,
  FormInputFile,
  FormInputHttpRequest,
  FormInputKeyValue,
  FormInputSelect,
  FormInputText,
  JsonPrimitive,
} from "@yaakapp-internal/plugins";
import classNames from "classnames";
import { useAtomValue } from "jotai";
import { useCallback, useEffect, useMemo } from "react";
import { useActiveRequest } from "../hooks/useActiveRequest";
import { useRandomKey } from "../hooks/useRandomKey";
import { capitalize } from "../lib/capitalize";
import { showDialog } from "../lib/dialog";
import { resolvedModelName } from "../lib/resolvedModelName";
import { Banner } from "./core/Banner";
import { Checkbox } from "./core/Checkbox";
import { DetailsBanner } from "./core/DetailsBanner";
import { Editor } from "./core/Editor/LazyEditor";
import { IconButton } from "./core/IconButton";
import type { InputProps } from "./core/Input";
import { Input } from "./core/Input";
import { Label } from "./core/Label";
import type { Pair } from "./core/PairEditor";
import { PairEditor } from "./core/PairEditor";
import { PlainInput } from "./core/PlainInput";
import { Select } from "./core/Select";
import { VStack } from "./core/Stacks";
import { Markdown } from "./Markdown";
import { SelectFile } from "./SelectFile";

export const DYNAMIC_FORM_NULL_ARG = "__NULL__";
const INPUT_SIZE = "sm";

interface Props<T> {
  inputs: FormInput[] | undefined | null;
  onChange: (value: T) => void;
  data: T;
  autocompleteFunctions?: boolean;
  autocompleteVariables?: boolean;
  stateKey: string;
  className?: string;
  disabled?: boolean;
}

export function DynamicForm<T extends Record<string, JsonPrimitive>>({
  inputs,
  data,
  onChange,
  autocompleteVariables,
  autocompleteFunctions,
  stateKey,
  className,
  disabled,
}: Props<T>) {
  const setDataAttr = useCallback(
    (name: string, value: JsonPrimitive) => {
      onChange({ ...data, [name]: value === DYNAMIC_FORM_NULL_ARG ? undefined : value });
    },
    [data, onChange],
  );

  return (
    <FormInputsStack
      disabled={disabled}
      inputs={inputs}
      setDataAttr={setDataAttr}
      stateKey={stateKey}
      autocompleteFunctions={autocompleteFunctions}
      autocompleteVariables={autocompleteVariables}
      data={data}
      className={classNames(className, "pb-4")} // Pad the bottom to look nice
    />
  );
}

function FormInputsStack<T extends Record<string, JsonPrimitive>>({
  className,
  ...props
}: FormInputsProps<T> & { className?: string }) {
  return (
    <VStack
      space={3}
      className={classNames(
        className,
        "h-full overflow-auto",
        "pr-1", // A bit of space between inputs and scrollbar
      )}
    >
      <FormInputs {...props} />
    </VStack>
  );
}

type FormInputsProps<T> = Pick<
  Props<T>,
  "inputs" | "autocompleteFunctions" | "autocompleteVariables" | "stateKey" | "data"
> & {
  setDataAttr: (name: string, value: JsonPrimitive) => void;
  disabled?: boolean;
};

function FormInputs<T extends Record<string, JsonPrimitive>>({
  inputs,
  autocompleteFunctions,
  autocompleteVariables,
  stateKey,
  setDataAttr,
  data,
  disabled,
}: FormInputsProps<T>) {
  return (
    <>
      {inputs?.map((input, i) => {
        if ("hidden" in input && input.hidden) {
          return null;
        }

        if ("disabled" in input && disabled != null) {
          input.disabled = disabled;
        }

        switch (input.type) {
          case "select":
            return (
              <SelectArg
                key={i + stateKey}
                arg={input}
                onChange={(v) => setDataAttr(input.name, v)}
                value={
                  data[input.name]
                    ? String(data[input.name])
                    : (input.defaultValue ?? DYNAMIC_FORM_NULL_ARG)
                }
              />
            );
          case "text":
            return (
              <TextArg
                key={i + stateKey}
                stateKey={stateKey}
                arg={input}
                autocompleteFunctions={autocompleteFunctions || false}
                autocompleteVariables={autocompleteVariables || false}
                onChange={(v) => setDataAttr(input.name, v)}
                value={
                  data[input.name] != null ? String(data[input.name]) : (input.defaultValue ?? "")
                }
              />
            );
          case "editor":
            return (
              <EditorArg
                key={i + stateKey}
                stateKey={stateKey}
                arg={input}
                autocompleteFunctions={autocompleteFunctions || false}
                autocompleteVariables={autocompleteVariables || false}
                onChange={(v) => setDataAttr(input.name, v)}
                value={
                  data[input.name] != null ? String(data[input.name]) : (input.defaultValue ?? "")
                }
              />
            );
          case "checkbox":
            return (
              <CheckboxArg
                key={i + stateKey}
                arg={input}
                onChange={(v) => setDataAttr(input.name, v)}
                value={data[input.name] != null ? data[input.name] === true : false}
              />
            );
          case "http_request":
            return (
              <HttpRequestArg
                key={i + stateKey}
                arg={input}
                onChange={(v) => setDataAttr(input.name, v)}
                value={data[input.name] != null ? String(data[input.name]) : DYNAMIC_FORM_NULL_ARG}
              />
            );
          case "file":
            return (
              <FileArg
                key={i + stateKey}
                arg={input}
                onChange={(v) => setDataAttr(input.name, v)}
                filePath={
                  data[input.name] != null ? String(data[input.name]) : DYNAMIC_FORM_NULL_ARG
                }
              />
            );
          case "accordion":
            if (!hasVisibleInputs(input.inputs)) {
              return null;
            }
            return (
              <div key={i + stateKey}>
                <DetailsBanner
                  summary={input.label}
                  className={classNames("!mb-auto", disabled && "opacity-disabled")}
                >
                  <div className="mt-3">
                    <FormInputsStack
                      data={data}
                      disabled={disabled}
                      inputs={input.inputs}
                      setDataAttr={setDataAttr}
                      stateKey={stateKey}
                      autocompleteFunctions={autocompleteFunctions || false}
                      autocompleteVariables={autocompleteVariables}
                    />
                  </div>
                </DetailsBanner>
              </div>
            );
          case "h_stack":
            if (!hasVisibleInputs(input.inputs)) {
              return null;
            }
            return (
              <div className="flex flex-wrap sm:flex-nowrap gap-3 items-end" key={i + stateKey}>
                <FormInputs
                  data={data}
                  disabled={disabled}
                  inputs={input.inputs}
                  setDataAttr={setDataAttr}
                  stateKey={stateKey}
                  autocompleteFunctions={autocompleteFunctions || false}
                  autocompleteVariables={autocompleteVariables}
                />
              </div>
            );
          case "banner":
            if (!hasVisibleInputs(input.inputs)) {
              return null;
            }
            return (
              <Banner
                key={i + stateKey}
                color={input.color}
                className={classNames(disabled && "opacity-disabled")}
              >
                <FormInputsStack
                  data={data}
                  disabled={disabled}
                  inputs={input.inputs}
                  setDataAttr={setDataAttr}
                  stateKey={stateKey}
                  autocompleteFunctions={autocompleteFunctions || false}
                  autocompleteVariables={autocompleteVariables}
                />
              </Banner>
            );
          case "markdown":
            return <Markdown key={i + stateKey}>{input.content}</Markdown>;
          case "key_value":
            return (
              <KeyValueArg
                key={i + stateKey}
                arg={input}
                stateKey={stateKey}
                onChange={(v) => setDataAttr(input.name, v)}
                value={
                  data[input.name] != null ? String(data[input.name]) : (input.defaultValue ?? "[]")
                }
              />
            );
          default:
            // @ts-expect-error
            throw new Error(`Invalid input type: ${input.type}`);
        }
      })}
    </>
  );
}

function TextArg({
  arg,
  onChange,
  value,
  autocompleteFunctions,
  autocompleteVariables,
  stateKey,
}: {
  arg: FormInputText;
  value: string;
  onChange: (v: string) => void;
  autocompleteFunctions: boolean;
  autocompleteVariables: boolean;
  stateKey: string;
}) {
  const props: InputProps = {
    onChange,
    name: arg.name,
    multiLine: arg.multiLine,
    className: arg.multiLine ? "min-h-[4rem]" : undefined,
    defaultValue: value === DYNAMIC_FORM_NULL_ARG ? arg.defaultValue : value,
    required: !arg.optional,
    disabled: arg.disabled,
    help: arg.description,
    type: arg.password ? "password" : "text",
    label: arg.label ?? arg.name,
    size: INPUT_SIZE,
    hideLabel: arg.hideLabel ?? arg.label == null,
    placeholder: arg.placeholder ?? undefined,
    forceUpdateKey: stateKey,
    autocomplete: arg.completionOptions ? { options: arg.completionOptions } : undefined,
    stateKey,
    autocompleteFunctions,
    autocompleteVariables,
  };
  if (autocompleteVariables || autocompleteFunctions || arg.completionOptions) {
    return <Input {...props} />;
  }
  return <PlainInput {...props} />;
}

function EditorArg({
  arg,
  onChange,
  value,
  autocompleteFunctions,
  autocompleteVariables,
  stateKey,
}: {
  arg: FormInputEditor;
  value: string;
  onChange: (v: string) => void;
  autocompleteFunctions: boolean;
  autocompleteVariables: boolean;
  stateKey: string;
}) {
  const id = `input-${arg.name}`;

  // Read-only editor force refresh for every defaultValue change
  // Should this be built into the <Editor/> component?
  const [popoutKey, regeneratePopoutKey] = useRandomKey();
  const forceUpdateKey = popoutKey + (arg.readOnly ? arg.defaultValue + stateKey : stateKey);

  return (
    <div className="w-full grid grid-cols-1 grid-rows-[auto_minmax(0,1fr)]">
      <Label
        htmlFor={id}
        required={!arg.optional}
        visuallyHidden={arg.hideLabel}
        help={arg.description}
        tags={arg.language ? [capitalize(arg.language)] : undefined}
      >
        {arg.label}
      </Label>
      <div
        className={classNames(
          "border border-border rounded-md overflow-hidden px-2 py-1",
          "focus-within:border-border-focus",
          !arg.rows && "max-h-[10rem]", // So it doesn't take up too much space
        )}
        style={arg.rows ? { height: `${arg.rows * 1.4 + 0.75}rem` } : undefined}
      >
        <Editor
          id={id}
          autocomplete={arg.completionOptions ? { options: arg.completionOptions } : undefined}
          disabled={arg.disabled}
          language={arg.language}
          readOnly={arg.readOnly}
          onChange={onChange}
          hideGutter
          heightMode="auto"
          className="min-h-[3rem]"
          defaultValue={value === DYNAMIC_FORM_NULL_ARG ? arg.defaultValue : value}
          placeholder={arg.placeholder ?? undefined}
          autocompleteFunctions={autocompleteFunctions}
          autocompleteVariables={autocompleteVariables}
          stateKey={stateKey}
          forceUpdateKey={forceUpdateKey}
          actions={
            <div>
              <IconButton
                variant="border"
                size="sm"
                className="my-0.5 opacity-60 group-hover:opacity-100"
                icon="expand"
                title="Pop out to large editor"
                onClick={() => {
                  showDialog({
                    id: "id",
                    size: "full",
                    title: arg.readOnly ? "View Value" : "Edit Value",
                    className: "!max-w-[50rem] !max-h-[60rem]",
                    description: arg.label && (
                      <Label
                        htmlFor={id}
                        required={!arg.optional}
                        visuallyHidden={arg.hideLabel}
                        help={arg.description}
                        tags={arg.language ? [capitalize(arg.language)] : undefined}
                      >
                        {arg.label}
                      </Label>
                    ),
                    onClose() {
                      // Force the main editor to update on close
                      regeneratePopoutKey();
                    },
                    render() {
                      return (
                        <Editor
                          id={id}
                          autocomplete={
                            arg.completionOptions ? { options: arg.completionOptions } : undefined
                          }
                          disabled={arg.disabled}
                          language={arg.language}
                          readOnly={arg.readOnly}
                          onChange={onChange}
                          defaultValue={value === DYNAMIC_FORM_NULL_ARG ? arg.defaultValue : value}
                          placeholder={arg.placeholder ?? undefined}
                          autocompleteFunctions={autocompleteFunctions}
                          autocompleteVariables={autocompleteVariables}
                          stateKey={stateKey}
                          forceUpdateKey={forceUpdateKey}
                        />
                      );
                    },
                  });
                }}
              />
            </div>
          }
        />
      </div>
    </div>
  );
}

function SelectArg({
  arg,
  value,
  onChange,
}: {
  arg: FormInputSelect;
  value: string;
  onChange: (v: string) => void;
}) {
  return (
    <Select
      label={arg.label ?? arg.name}
      name={arg.name}
      help={arg.description}
      onChange={onChange}
      defaultValue={arg.defaultValue}
      hideLabel={arg.hideLabel}
      value={value}
      size={INPUT_SIZE}
      disabled={arg.disabled}
      options={arg.options}
    />
  );
}

function FileArg({
  arg,
  filePath,
  onChange,
}: {
  arg: FormInputFile;
  filePath: string;
  onChange: (v: string | null) => void;
}) {
  return (
    <SelectFile
      disabled={arg.disabled}
      help={arg.description}
      onChange={({ filePath }) => onChange(filePath)}
      filePath={filePath === DYNAMIC_FORM_NULL_ARG ? null : filePath}
      directory={!!arg.directory}
    />
  );
}

function HttpRequestArg({
  arg,
  value,
  onChange,
}: {
  arg: FormInputHttpRequest;
  value: string;
  onChange: (v: string) => void;
}) {
  const folders = useAtomValue(foldersAtom);
  const httpRequests = useAtomValue(httpRequestsAtom);
  const activeHttpRequest = useActiveRequest("http_request");

  useEffect(() => {
    if (value === DYNAMIC_FORM_NULL_ARG && activeHttpRequest) {
      onChange(activeHttpRequest.id);
    }
  }, [activeHttpRequest, onChange, value]);

  return (
    <Select
      label={arg.label ?? arg.name}
      name={arg.name}
      onChange={onChange}
      help={arg.description}
      value={value}
      disabled={arg.disabled}
      options={httpRequests.map((r) => {
        return {
          label:
            buildRequestBreadcrumbs(r, folders).join(" / ") +
            (r.id === activeHttpRequest?.id ? " (current)" : ""),
          value: r.id,
        };
      })}
    />
  );
}

function buildRequestBreadcrumbs(request: HttpRequest, folders: Folder[]): string[] {
  const ancestors: (HttpRequest | Folder)[] = [request];

  const next = () => {
    const latest = ancestors[0];
    if (latest == null) return [];

    const parent = folders.find((f) => f.id === latest.folderId);
    if (parent == null) return;

    ancestors.unshift(parent);
    next();
  };
  next();

  return ancestors.map((a) => (a.model === "folder" ? a.name : resolvedModelName(a)));
}

function CheckboxArg({
  arg,
  onChange,
  value,
}: {
  arg: FormInputCheckbox;
  value: boolean;
  onChange: (v: boolean) => void;
}) {
  return (
    <Checkbox
      onChange={onChange}
      checked={value}
      help={arg.description}
      disabled={arg.disabled}
      title={arg.label ?? arg.name}
      hideLabel={arg.label == null}
    />
  );
}

function KeyValueArg({
  arg,
  onChange,
  value,
  stateKey,
}: {
  arg: FormInputKeyValue;
  value: string;
  onChange: (v: string) => void;
  stateKey: string;
}) {
  const pairs: Pair[] = useMemo(() => {
    try {
      const parsed = JSON.parse(value);
      return Array.isArray(parsed) ? parsed : [];
    } catch {
      return [];
    }
  }, [value]);

  const handleChange = useCallback(
    (newPairs: Pair[]) => {
      onChange(JSON.stringify(newPairs));
    },
    [onChange],
  );

  return (
    <div className="w-full grid grid-cols-1 grid-rows-[auto_minmax(0,1fr)] overflow-hidden">
      <Label
        htmlFor={`input-${arg.name}`}
        required={!arg.optional}
        visuallyHidden={arg.hideLabel}
        help={arg.description}
      >
        {arg.label ?? arg.name}
      </Label>
      <PairEditor
        pairs={pairs}
        onChange={handleChange}
        stateKey={stateKey}
        namePlaceholder="name"
        valuePlaceholder="value"
        noScroll
      />
    </div>
  );
}

function hasVisibleInputs(inputs: FormInput[] | undefined): boolean {
  if (!inputs) return false;

  for (const input of inputs) {
    if ("inputs" in input && !hasVisibleInputs(input.inputs)) {
      // Has children, but none are visible
      return false;
    }
    if (!input.hidden) {
      return true;
    }
  }

  return false;
}