"use client";

import { FormEvent, useEffect, useMemo, useState } from "react";
import { AppShell } from "@/components/app-shell";
import { apiFetch } from "@/lib/api";

type Household = { id: string; name: string };
type Person = { id: string; email: string; fullName?: string | null };
type AccountantTask = {
  id: string;
  title: string;
  description?: string | null;
  taskType: string;
  status: string;
  priority: string;
  dueDate?: string | null;
  completedAt?: string | null;
  assignedTo?: Person | null;
  createdBy?: Person | null;
};

export default function AccountantPage() {
  const [households, setHouseholds] = useState<Household[]>([]);
  const [householdId, setHouseholdId] = useState("");
  const [tasks, setTasks] = useState<AccountantTask[]>([]);
  const [draft, setDraft] = useState({ title: "", description: "", taskType: "review", priority: "medium", dueDate: "" });
  const [status, setStatus] = useState("");
  const selectedHousehold = useMemo(() => households.find((item) => item.id === householdId), [households, householdId]);

  useEffect(() => {
    void loadHouseholds();
  }, []);

  useEffect(() => {
    if (householdId) void loadTasks(householdId);
  }, [householdId]);

  const loadHouseholds = async () => {
    const res = await apiFetch<Household[]>("/api/households");
    if (res.error) {
      setStatus(res.error.message);
      return;
    }
    const list = res.data ?? [];
    setHouseholds(list);
    setHouseholdId((current) => current || list[0]?.id || "");
  };

  const loadTasks = async (id = householdId) => {
    const res = await apiFetch<AccountantTask[]>(`/api/households/${id}/accountant-tasks`);
    if (res.error) {
      setStatus(res.error.message);
      setTasks([]);
      return;
    }
    setStatus("");
    setTasks(res.data ?? []);
  };

  const createTask = async (event: FormEvent) => {
    event.preventDefault();
    if (!householdId || !draft.title.trim()) return;
    const res = await apiFetch<AccountantTask>(`/api/households/${householdId}/accountant-tasks`, {
      method: "POST",
      body: JSON.stringify({
        title: draft.title,
        description: draft.description || undefined,
        taskType: draft.taskType,
        priority: draft.priority,
        dueDate: draft.dueDate || undefined,
      }),
    });
    if (res.error) {
      setStatus(res.error.message);
      return;
    }
    setDraft({ title: "", description: "", taskType: "review", priority: "medium", dueDate: "" });
    await loadTasks();
  };

  const updateTask = async (task: AccountantTask, nextStatus: string) => {
    if (!householdId) return;
    const res = await apiFetch<AccountantTask>(`/api/households/${householdId}/accountant-tasks/${task.id}`, {
      method: "PATCH",
      body: JSON.stringify({ status: nextStatus }),
    });
    if (res.error) {
      setStatus(res.error.message);
      return;
    }
    await loadTasks();
  };

  return (
    <AppShell title="Accountant Workflow" subtitle="Track household advisor requests, reviews, and follow-ups.">
      <div className="mx-auto flex w-full max-w-6xl flex-col gap-6">
        {status ? <div className="rounded-md border border-amber-200 bg-amber-50 px-4 py-3 text-sm text-amber-900">{status}</div> : null}

        <section className="rounded-lg border border-slate-200 bg-white p-4">
          <div className="flex flex-col gap-3 sm:flex-row sm:items-center sm:justify-between">
            <div>
              <h2 className="text-base font-semibold text-slate-950">Household</h2>
              <p className="text-sm text-slate-600">{selectedHousehold?.name ?? "Choose a household to manage advisor work."}</p>
            </div>
            <select value={householdId} onChange={(event) => setHouseholdId(event.target.value)} className="rounded-md border border-slate-300 px-3 py-2 text-sm">
              {households.map((household) => (
                <option key={household.id} value={household.id}>{household.name}</option>
              ))}
            </select>
          </div>
        </section>

        <form onSubmit={createTask} className="rounded-lg border border-slate-200 bg-white p-4">
          <h2 className="text-base font-semibold text-slate-950">New Task</h2>
          <div className="mt-4 grid gap-3 md:grid-cols-2">
            <input value={draft.title} onChange={(event) => setDraft({ ...draft, title: event.target.value })} placeholder="Task title" className="rounded-md border border-slate-300 px-3 py-2 text-sm" />
            <input type="date" value={draft.dueDate} onChange={(event) => setDraft({ ...draft, dueDate: event.target.value })} className="rounded-md border border-slate-300 px-3 py-2 text-sm" />
            <select value={draft.taskType} onChange={(event) => setDraft({ ...draft, taskType: event.target.value })} className="rounded-md border border-slate-300 px-3 py-2 text-sm">
              <option value="review">Review</option>
              <option value="document_request">Document request</option>
              <option value="tax_prep">Tax prep</option>
              <option value="advice">Advice</option>
            </select>
            <select value={draft.priority} onChange={(event) => setDraft({ ...draft, priority: event.target.value })} className="rounded-md border border-slate-300 px-3 py-2 text-sm">
              <option value="low">Low</option>
              <option value="medium">Medium</option>
              <option value="high">High</option>
            </select>
          </div>
          <textarea value={draft.description} onChange={(event) => setDraft({ ...draft, description: event.target.value })} placeholder="Notes or request details" className="mt-3 min-h-24 w-full rounded-md border border-slate-300 px-3 py-2 text-sm" />
          <button className="mt-3 rounded-md bg-slate-950 px-4 py-2 text-sm font-medium text-white">Create task</button>
        </form>

        <section className="grid gap-3">
          {tasks.length ? tasks.map((task) => (
            <article key={task.id} className="rounded-lg border border-slate-200 bg-white p-4">
              <div className="flex flex-col gap-3 sm:flex-row sm:items-start sm:justify-between">
                <div>
                  <h3 className="font-semibold text-slate-950">{task.title}</h3>
                  <p className="mt-1 text-sm text-slate-600">{task.description || "No details added."}</p>
                  <p className="mt-2 text-xs uppercase text-slate-500">
                    {task.taskType.replace(/_/g, " ")} · {task.priority} · {task.dueDate ? new Date(task.dueDate).toLocaleDateString() : "No due date"}
                  </p>
                </div>
                <div className="flex gap-2">
                  <button onClick={() => updateTask(task, "open")} className="rounded-md border border-slate-300 px-3 py-1.5 text-xs">Open</button>
                  <button onClick={() => updateTask(task, "in_progress")} className="rounded-md border border-blue-200 px-3 py-1.5 text-xs text-blue-700">In progress</button>
                  <button onClick={() => updateTask(task, "completed")} className="rounded-md border border-emerald-200 px-3 py-1.5 text-xs text-emerald-700">Complete</button>
                </div>
              </div>
              <div className="mt-3 text-xs text-slate-500">Status: {task.status.replace(/_/g, " ")}</div>
            </article>
          )) : (
            <div className="rounded-lg border border-dashed border-slate-300 bg-white p-6 text-sm text-slate-500">No accountant tasks yet.</div>
          )}
        </section>
      </div>
    </AppShell>
  );
}