/**
 * @file ProjectMemoryModal.tsx
 * @description Create a project's memory file — CLAUDE.md or AGENTS.md — in a
 * directory that is not the dashboard's own. Shared by the Claude Code and
 * Codex config pages; the caller supplies its i18n namespace and the create
 * call, so this component knows about neither tool.
 *
 * The directory list is `GET /api/run/cwds` (the dashboard's known projects),
 * offered as suggestions on a plain text input rather than a closed dropdown:
 * a project you have never run through the dashboard is exactly the case this
 * modal exists for, so it must stay typeable. Typed text is a draft: closing
 * asks first, and it is a real dialog (focus trap, Escape).
 *
 * @author Nguyễn Ngọc Trí Vĩ <vinnt@smartgift.vn>
 */

import { useCallback, useEffect, useId, useRef, useState } from "react";
import { useTranslation } from "react-i18next";
import { BookOpen, X, Save, AlertCircle } from "lucide-react";
import { api, type CwdSuggestion } from "../../lib/api";
import { confirmDiscard } from "../../lib/confirm";
import { useDialog } from "../../hooks/useDialog";
import { useUnsavedGuard } from "../../hooks/useUnsavedGuard";
import { PathPickButton } from "../PathPickButton";

interface ProjectMemoryModalProps {
  /** i18n namespace of the calling page — "ccConfig" or "codexConfig". */
  ns: string;
  /** The file this will create, e.g. "CLAUDE.md". Shown, never sent. */
  filename: string;
  /** Starting body text, so the user edits a skeleton instead of a blank box. */
  template: string;
  onClose: () => void;
  /** Resolves with the path actually written (the server realpaths the dir). */
  onCreate: (args: { dir: string; content: string }) => Promise<string>;
}

export function ProjectMemoryModal({
  ns,
  filename,
  template,
  onClose,
  onCreate,
}: ProjectMemoryModalProps) {
  // Every key lives under `projectMemory.*` in BOTH namespaces, so this
  // component never depends on the calling page's other key groups lining up.
  const { t } = useTranslation(ns);
  const listId = useId();
  const [dir, setDir] = useState("");
  const [content, setContent] = useState(template);
  const [suggestions, setSuggestions] = useState<CwdSuggestion[]>([]);
  const [saving, setSaving] = useState(false);
  const [error, setError] = useState<string | null>(null);

  useEffect(() => {
    api.run
      .cwds()
      .then((r) => setSuggestions(r.items))
      // Suggestions are a convenience; the input still works without them.
      .catch(() => undefined);
  }, []);

  // Typed text is a draft: closing (X, Cancel, backdrop, Escape) asks first,
  // and Escape inside the textarea only leaves the field.
  const dirty = dir.trim() !== "" || content !== template;
  useUnsavedGuard(dirty);
  const panelRef = useRef<HTMLDivElement>(null);
  const requestClose = useCallback(async () => {
    if (dirty && !(await confirmDiscard())) return;
    onClose();
  }, [dirty, onClose]);
  useDialog(true, panelRef, () => {
    const el = document.activeElement;
    if (el instanceof HTMLTextAreaElement) {
      el.blur();
      return;
    }
    void requestClose();
  });

  const handleCreate = useCallback(async () => {
    const target = dir.trim();
    if (!target) {
      setError(t("projectMemory.dirRequired"));
      return;
    }
    setSaving(true);
    setError(null);
    try {
      await onCreate({ dir: target, content });
    } catch (err: unknown) {
      setError(err instanceof Error ? err.message : "unknown");
    } finally {
      setSaving(false);
    }
  }, [dir, content, onCreate, t]);

  return (
    <div
      className="fixed inset-0 bg-surface-0/70 z-50 flex items-center justify-center p-4"
      onClick={() => void requestClose()}
    >
      <div
        ref={panelRef}
        role="dialog"
        aria-modal="true"
        aria-labelledby={`${listId}-title`}
        className="relative w-full max-w-3xl max-h-[90vh] rounded-xl border border-border bg-surface-1 flex flex-col"
        onClick={(e) => e.stopPropagation()}
      >
        <div className="flex items-center gap-2 border-b border-border px-4 py-2.5">
          <BookOpen className="w-4 h-4 text-fg-muted" />
          <span
            id={`${listId}-title`}
            className="text-sm font-medium text-fg-primary flex-1 truncate"
          >
            {t("projectMemory.title", { file: filename })}
          </span>
          <button
            type="button"
            onClick={() => void requestClose()}
            className="text-fg-secondary hover:text-fg-primary p-1 rounded-md hover:bg-surface-3"
            aria-label={t("projectMemory.close")}
          >
            <X className="w-4 h-4" />
          </button>
        </div>

        <div className="overflow-auto p-4 space-y-3">
          <div>
            <label
              htmlFor={`${listId}-dir`}
              className="block text-[11px] font-semibold uppercase tracking-wider text-fg-muted mb-1"
            >
              {t("projectMemory.dirLabel")}
            </label>
            <div className="flex gap-1.5">
              <input
                id={`${listId}-dir`}
                list={listId}
                value={dir}
                onChange={(e) => setDir(e.target.value)}
                placeholder="/home/you/projects/my-app"
                spellCheck={false}
                className="w-full bg-surface-2 border border-border rounded-md px-3 py-1.5 text-sm font-mono text-fg-primary placeholder:text-fg-muted focus:outline-none focus:border-accent/50"
              />
              <PathPickButton start={dir} onPick={setDir} />
            </div>
            <datalist id={listId}>
              {suggestions.map((s) => (
                <option key={s.path} value={s.path}>
                  {s.label}
                </option>
              ))}
            </datalist>
            <p className="mt-1 text-[10px] text-fg-muted">
              {t("projectMemory.dirHelp", { file: filename })}
            </p>
          </div>

          <div>
            <label
              htmlFor={`${listId}-content`}
              className="block text-[11px] font-semibold uppercase tracking-wider text-fg-muted mb-1"
            >
              {t("projectMemory.contentLabel")}
            </label>
            <textarea
              id={`${listId}-content`}
              value={content}
              onChange={(e) => setContent(e.target.value)}
              spellCheck={false}
              className="w-full h-64 bg-surface-2 border border-border rounded-md px-3 py-2 text-[11px] font-mono text-fg-primary focus:outline-none focus:border-accent/50 resize-y"
            />
          </div>

          {error && (
            <div
              role="alert"
              className="rounded-md border border-status-danger/40 bg-status-danger/10 px-3 py-2 text-xs text-status-danger inline-flex items-center gap-2"
            >
              <AlertCircle className="w-3.5 h-3.5" />
              {error}
            </div>
          )}
        </div>

        <div className="border-t border-border px-4 py-3 flex items-center justify-end gap-2">
          <button
            type="button"
            onClick={() => void requestClose()}
            className="text-[12px] font-medium px-3 py-1.5 rounded-md border border-border bg-surface-2 hover:bg-surface-3 text-fg-secondary"
          >
            {t("projectMemory.cancel")}
          </button>
          <button
            type="button"
            onClick={handleCreate}
            disabled={saving}
            className="text-[12px] font-medium px-3 py-1.5 rounded-md border border-accent/40 bg-accent/15 hover:bg-accent/25 text-accent inline-flex items-center gap-1.5 disabled:opacity-60"
          >
            <Save className="w-3.5 h-3.5" />
            {saving ? t("projectMemory.saving") : t("projectMemory.createButton")}
          </button>
        </div>
      </div>
    </div>
  );
}