"use client";

import { useState } from "react";
import type { Project } from "../../../lib/db";
import {
  ANDERS,
  PROJECT_PLAN_GROUPS,
  andersKey,
  type PlanField,
  type ProjectPlan,
} from "../../../lib/projectPlan";
import { MultiSelectDropdown } from "./MultiSelectDropdown";

const inputClass =
  "w-full h-10 rounded-lg border border-zinc-300 dark:border-zinc-700 bg-white dark:bg-zinc-800 px-3 text-sm text-zinc-900 dark:text-zinc-100 focus:outline-none focus:ring-2 focus:ring-rikx-orange";
const textareaClass =
  "w-full min-h-28 rounded-lg border border-zinc-300 dark:border-zinc-700 bg-white dark:bg-zinc-800 px-3 py-2 text-sm text-zinc-900 dark:text-zinc-100 focus:outline-none focus:ring-2 focus:ring-rikx-orange";

type ColumnKey = "projectkosten" | "deelnemers_werk" | "deelnemers_skills" | "financiering_extern_bedrag" | "financiering_extern_pct";

function FieldInput({
  field,
  project,
  plan,
  onSelectChange,
}: {
  field: PlanField;
  project: Project;
  plan: ProjectPlan;
  onSelectChange: (key: string, value: string) => void;
}) {
  const id = `plan-${field.key}`;
  const saved = plan[field.key];
  const [anders, setAnders] = useState(Array.isArray(saved) && saved.includes(ANDERS));

  switch (field.kind) {
    case "textarea":
      return <textarea id={id} name={field.key} defaultValue={typeof saved === "string" ? saved : ""} className={textareaClass} />;
    case "number": {
      const value = field.column ? project[field.key as ColumnKey] : saved;
      return (
        <input
          id={id}
          name={field.key}
          type="number"
          min={field.min}
          max={field.max}
          step={field.step}
          defaultValue={typeof value === "number" ? value : ""}
          className={inputClass}
        />
      );
    }
    case "date":
      return <input id={id} name={field.key} type="date" defaultValue={typeof saved === "string" ? saved : ""} className={inputClass} />;
    case "select":
      return (
        <select
          id={id}
          name={field.key}
          defaultValue={typeof saved === "string" ? saved : ""}
          onChange={(e) => onSelectChange(field.key, e.target.value)}
          className={inputClass}
        >
          <option value="">Maak een keuze</option>
          {field.options.map((o) => (
            <option key={o} value={o}>
              {o}
            </option>
          ))}
        </select>
      );
    case "multiselect": {
      const andersValue = plan[andersKey(field.key)];
      return (
        <>
          <MultiSelectDropdown
            id={id}
            name={field.key}
            options={field.options}
            defaultValue={Array.isArray(saved) ? saved : []}
            onChange={(values) => setAnders(values.includes(ANDERS))}
            className={inputClass}
          />
          {anders && (
            <input
              name={andersKey(field.key)}
              aria-label={`${field.label} – anders, namelijk`}
              placeholder="Anders, namelijk…"
              defaultValue={typeof andersValue === "string" ? andersValue : ""}
              className={`${inputClass} mt-2`}
            />
          )}
        </>
      );
    }
  }
}

// Stap 1 "Project plan": alle velden uit lib/projectPlan.ts, gegroepeerd.
export function ProjectPlanFields({ project, plan }: { project: Project; plan: ProjectPlan }) {
  // Huidige waarden van selects, voor velden met showIf (bv. "Zo ja, licht toe")
  const [selects, setSelects] = useState<Record<string, string>>(() =>
    Object.fromEntries(
      PROJECT_PLAN_GROUPS.flatMap((g) => g.fields)
        .filter((f) => f.kind === "select")
        .map((f) => [f.key, typeof plan[f.key] === "string" ? (plan[f.key] as string) : ""])
    )
  );

  return (
    <div className="flex flex-col gap-8">
      {PROJECT_PLAN_GROUPS.map((group) => (
        <fieldset key={group.title} className="flex flex-col gap-4">
          <legend className="text-sm font-semibold text-zinc-900 dark:text-zinc-100 mb-3 pb-2 border-b border-zinc-200 dark:border-zinc-800 w-full">
            {group.title}
          </legend>
          <div className="grid grid-cols-1 sm:grid-cols-2 gap-x-4 gap-y-5">
            {group.fields
              .filter((f) => !f.showIf || selects[f.showIf.key] === f.showIf.equals)
              .map((field) => (
                <div
                  key={field.key}
                  className={[
                    "flex flex-col gap-1",
                    field.wide ? "sm:col-span-2" : "",
                    field.newRow ? "sm:col-start-1" : "",
                    field.followUp ? "-mt-3 ml-2 pl-4 border-l-2 border-rikx-orange" : "",
                  ].join(" ")}
                >
                  {/* Minimaal twee regels hoog, zodat velden naast elkaar uitlijnen bij labels van ongelijke lengte */}
                  <label
                    htmlFor={`plan-${field.key}`}
                    className={`text-sm font-medium text-zinc-700 dark:text-zinc-300 ${field.wide || field.newRow ? "" : "sm:min-h-10"}`}
                  >
                    {field.label}
                  </label>
                  <FieldInput
                    field={field}
                    project={project}
                    plan={plan}
                    onSelectChange={(key, value) => setSelects((s) => ({ ...s, [key]: value }))}
                  />
                  {field.hint && <span className="text-xs text-zinc-500">{field.hint}</span>}
                </div>
              ))}
          </div>
        </fieldset>
      ))}
    </div>
  );
}