// app/tasks/CardModal.tsx
// New / edit card modal. Fields adapt to the selected task_type.

"use client";

import { useEffect, useState } from "react";
import {
  TASK_TYPE_LABEL,
  PRIORITY_LABEL,
  type TaskType,
  type TaskPriority,
  type TaskStatus,
} from "./columns";
import type { Task, CreateTaskInput } from "./api";

interface CardModalProps {
  open: boolean;
  onClose: () => void;
  onSubmit: (input: CreateTaskInput) => Promise<void>;
  initial?: Partial<Task>;
  mode?: "create" | "edit";
}

const TASK_TYPES: TaskType[] = [
  "bizportal_search",
  "bizportal_reserve",
  "pdf_generate",
  "email_send",
  "custom",
];

const PRIORITIES: TaskPriority[] = ["low", "normal", "high", "urgent"];
const STATUSES: TaskStatus[] = ["backlog", "ready", "blocked"];

export default function CardModal({ open, onClose, onSubmit, initial, mode = "create" }: CardModalProps) {
  const [title, setTitle] = useState("");
  const [description, setDescription] = useState("");
  const [taskType, setTaskType] = useState<TaskType>("bizportal_search");
  const [priority, setPriority] = useState<TaskPriority>("normal");
  const [status, setStatus] = useState<TaskStatus>("backlog");
  const [assignee, setAssignee] = useState("agent");
  const [submitting, setSubmitting] = useState(false);
  const [error, setError] = useState<string | null>(null);

  // Payload fields per task type
  const [bpType, setBpType] = useState<"id" | "ck">("ck");
  const [bpQuery, setBpQuery] = useState("");
  const [bpNames, setBpNames] = useState<string>("");
  const [bpDryRun, setBpDryRun] = useState(false);
  const [pdfTemplate, setPdfTemplate] = useState("");
  const [pdfSource, setPdfSource] = useState("");
  const [emailTo, setEmailTo] = useState("");
  const [emailSubject, setEmailSubject] = useState("");
  const [emailBody, setEmailBody] = useState("");
  const [customJson, setCustomJson] = useState("");

  useEffect(() => {
    if (!open) return;
    setError(null);
    if (initial) {
      setTitle(initial.title ?? "");
      setDescription(initial.description ?? "");
      setTaskType(initial.task_type ?? "bizportal_search");
      setPriority(initial.priority ?? "normal");
      setStatus(initial.status ?? "backlog");
      setAssignee(initial.assignee ?? "agent");
      const p = (initial.payload ?? {}) as Record<string, any>;
      setBpType(p.type === "id" ? "id" : "ck");
      setBpQuery(p.query ?? "");
      setBpNames((p.names ?? []).join("\n"));
      setBpDryRun(!!p.dry_run);
      setPdfTemplate(p.template ?? "");
      setPdfSource(p.source ?? "");
      setEmailTo(p.to ?? "");
      setEmailSubject(p.subject ?? "");
      setEmailBody(p.body ?? "");
      setCustomJson(p.raw ? JSON.stringify(p.raw, null, 2) : "");
    } else {
      setTitle("");
      setDescription("");
      setTaskType("bizportal_search");
      setPriority("normal");
      setStatus("backlog");
      setAssignee("agent");
      setBpType("ck");
      setBpQuery("");
      setBpNames("");
      setBpDryRun(false);
      setPdfTemplate("");
      setPdfSource("");
      setEmailTo("");
      setEmailSubject("");
      setEmailBody("");
      setCustomJson("");
    }
  }, [open, initial]);

  if (!open) return null;

  function buildPayload(): Record<string, unknown> {
    switch (taskType) {
      case "bizportal_search":
        return { type: bpType, query: bpQuery.trim() };
      case "bizportal_reserve":
        return {
          names: bpNames.split("\n").map((s) => s.trim()).filter(Boolean),
          dry_run: bpDryRun,
        };
      case "pdf_generate":
        return { template: pdfTemplate.trim(), source: pdfSource.trim() };
      case "email_send":
        return { to: emailTo.trim(), subject: emailSubject.trim(), body: emailBody };
      case "custom":
        try {
          return { raw: customJson ? JSON.parse(customJson) : null };
        } catch (e: any) {
          throw new Error(`Custom JSON is invalid: ${e.message}`);
        }
    }
  }

  async function handleSubmit(e: React.FormEvent) {
    e.preventDefault();
    setError(null);
    if (!title.trim()) {
      setError("Title is required");
      return;
    }
    setSubmitting(true);
    try {
      const payload = buildPayload();
      await onSubmit({
        title: title.trim(),
        description: description.trim() || undefined,
        task_type: taskType,
        payload,
        priority,
        status,
        assignee,
        created_by: "user",
      });
      onClose();
    } catch (err: any) {
      setError(err.message ?? String(err));
    } finally {
      setSubmitting(false);
    }
  }

  return (
    <div
      className="fixed inset-0 z-40 bg-black/40 flex items-start justify-center pt-12 px-4 overflow-y-auto"
      onClick={onClose}
      role="dialog"
      aria-modal="true"
    >
      <div
        className="bg-surface rounded-lg border border-border shadow-xl w-full max-w-lg"
        onClick={(e) => e.stopPropagation()}
      >
        <form onSubmit={handleSubmit} className="p-5 space-y-4">
          <div className="flex items-center justify-between">
            <h2 className="text-lg font-bold text-fg">
              {mode === "edit" ? "Edit task" : "New task"}
            </h2>
            <button
              type="button"
              onClick={onClose}
              className="text-muted hover:text-fg text-sm"
              aria-label="Close"
            >
              ✕
            </button>
          </div>

          <Field label="Title">
            <input
              type="text"
              value={title}
              onChange={(e) => setTitle(e.target.value)}
              placeholder="e.g. Reserve name AMPLEFORTH PTY LTD"
              className="w-full px-3 py-2 rounded-md border border-border bg-bg text-fg text-sm focus:outline-none focus:ring-2 focus:ring-accent"
              autoFocus
              required
            />
          </Field>

          <Field label="Description">
            <textarea
              value={description}
              onChange={(e) => setDescription(e.target.value)}
              placeholder="Optional — context for the agent"
              rows={2}
              className="w-full px-3 py-2 rounded-md border border-border bg-bg text-fg text-sm focus:outline-none focus:ring-2 focus:ring-accent"
            />
          </Field>

          <div className="grid grid-cols-2 gap-3">
            <Field label="Type">
              <select
                value={taskType}
                onChange={(e) => setTaskType(e.target.value as TaskType)}
                className="w-full px-3 py-2 rounded-md border border-border bg-bg text-fg text-sm"
              >
                {TASK_TYPES.map((t) => (
                  <option key={t} value={t}>
                    {TASK_TYPE_LABEL[t]}
                  </option>
                ))}
              </select>
            </Field>
            <Field label="Priority">
              <select
                value={priority}
                onChange={(e) => setPriority(e.target.value as TaskPriority)}
                className="w-full px-3 py-2 rounded-md border border-border bg-bg text-fg text-sm"
              >
                {PRIORITIES.map((p) => (
                  <option key={p} value={p}>
                    {PRIORITY_LABEL[p]}
                  </option>
                ))}
              </select>
            </Field>
          </div>

          <div className="grid grid-cols-2 gap-3">
            <Field label="Status">
              <select
                value={status}
                onChange={(e) => setStatus(e.target.value as TaskStatus)}
                className="w-full px-3 py-2 rounded-md border border-border bg-bg text-fg text-sm"
              >
                {STATUSES.map((s) => (
                  <option key={s} value={s}>
                    {s.replace("_", " ")}
                  </option>
                ))}
              </select>
            </Field>
            <Field label="Assignee">
              <input
                type="text"
                value={assignee}
                onChange={(e) => setAssignee(e.target.value)}
                className="w-full px-3 py-2 rounded-md border border-border bg-bg text-fg text-sm"
              />
            </Field>
          </div>

          <hr className="border-border" />
          <h3 className="text-sm font-semibold text-fg">Payload</h3>

          {taskType === "bizportal_search" ? (
            <div className="grid grid-cols-3 gap-3">
              <Field label="Search by">
                <select
                  value={bpType}
                  onChange={(e) => setBpType(e.target.value as "id" | "ck")}
                  className="w-full px-3 py-2 rounded-md border border-border bg-bg text-fg text-sm"
                >
                  <option value="ck">CK No.</option>
                  <option value="id">Director ID</option>
                </select>
              </Field>
              <div className="col-span-2">
                <Field label="Query">
                  <input
                    type="text"
                    value={bpQuery}
                    onChange={(e) => setBpQuery(e.target.value)}
                    placeholder={bpType === "ck" ? "K2022808158" : "8709225206083"}
                    className="w-full px-3 py-2 rounded-md border border-border bg-bg text-fg text-sm"
                  />
                </Field>
              </div>
            </div>
          ) : null}

          {taskType === "bizportal_reserve" ? (
            <div className="space-y-3">
              <Field label="Names (one per line, in priority order)">
                <textarea
                  value={bpNames}
                  onChange={(e) => setBpNames(e.target.value)}
                  rows={4}
                  placeholder={"AMPLEFORTH PTY LTD\nAMPLEFORTH TRADING\nAMPLEFORTH SA\nAMPLEFORTH HOLDINGS"}
                  className="w-full px-3 py-2 rounded-md border border-border bg-bg text-fg text-sm font-mono"
                />
              </Field>
              <label className="flex items-center gap-2 text-sm text-fg">
                <input
                  type="checkbox"
                  checked={bpDryRun}
                  onChange={(e) => setBpDryRun(e.target.checked)}
                />
                Dry run (stop before payment — no R50 spent)
              </label>
            </div>
          ) : null}

          {taskType === "pdf_generate" ? (
            <div className="grid grid-cols-2 gap-3">
              <Field label="Template">
                <input
                  type="text"
                  value={pdfTemplate}
                  onChange={(e) => setPdfTemplate(e.target.value)}
                  placeholder="e.g. cor9_1_approval"
                  className="w-full px-3 py-2 rounded-md border border-border bg-bg text-fg text-sm"
                />
              </Field>
              <Field label="Source">
                <input
                  type="text"
                  value={pdfSource}
                  onChange={(e) => setPdfSource(e.target.value)}
                  placeholder="path or record id"
                  className="w-full px-3 py-2 rounded-md border border-border bg-bg text-fg text-sm"
                />
              </Field>
            </div>
          ) : null}

          {taskType === "email_send" ? (
            <div className="space-y-3">
              <Field label="To">
                <input
                  type="email"
                  value={emailTo}
                  onChange={(e) => setEmailTo(e.target.value)}
                  placeholder="client@example.com"
                  className="w-full px-3 py-2 rounded-md border border-border bg-bg text-fg text-sm"
                />
              </Field>
              <Field label="Subject">
                <input
                  type="text"
                  value={emailSubject}
                  onChange={(e) => setEmailSubject(e.target.value)}
                  className="w-full px-3 py-2 rounded-md border border-border bg-bg text-fg text-sm"
                />
              </Field>
              <Field label="Body">
                <textarea
                  value={emailBody}
                  onChange={(e) => setEmailBody(e.target.value)}
                  rows={4}
                  className="w-full px-3 py-2 rounded-md border border-border bg-bg text-fg text-sm"
                />
              </Field>
            </div>
          ) : null}

          {taskType === "custom" ? (
            <Field label="Custom payload (JSON)">
              <textarea
                value={customJson}
                onChange={(e) => setCustomJson(e.target.value)}
                rows={6}
                placeholder='{ "instruction": "do this and that" }'
                className="w-full px-3 py-2 rounded-md border border-border bg-bg text-fg text-xs font-mono"
              />
            </Field>
          ) : null}

          {error ? (
            <div className="text-xs text-red-700 bg-red-50 border border-red-300 rounded px-3 py-2">
              {error}
            </div>
          ) : null}

          <div className="flex justify-end gap-2 pt-2">
            <button
              type="button"
              onClick={onClose}
              className="px-4 py-2 rounded-md text-sm text-muted hover:text-fg"
            >
              Cancel
            </button>
            <button
              type="submit"
              disabled={submitting}
              className="px-5 py-2 rounded-md bg-accent text-accent-on text-sm font-semibold hover:bg-accent-hover disabled:opacity-60"
            >
              {submitting ? "Saving…" : mode === "edit" ? "Save" : "Create task"}
            </button>
          </div>
        </form>
      </div>
    </div>
  );
}

function Field({ label, children }: { label: string; children: React.ReactNode }) {
  return (
    <label className="block">
      <span className="text-xs font-semibold text-muted mb-1 block">{label}</span>
      {children}
    </label>
  );
}