"use client";

import { useState } from "react";
import { useTheme } from "@/lib/use-theme";
import { useAuth } from "@/lib/auth";
import { AppShell } from "@/components/AppShell";
import { AlertBanner, Button, Card, Input, Select, Textarea } from "@/components/ui/Primitives";
import { getFeedbackClient } from "@/lib/feedback-client";
import { toast } from "@/lib/toast";
import { NOTES_API_URL, PLATFORM_SERVICE_URL, MCP_SERVER_URL, PRODUCT_ID } from "@/lib/product-config";
import { getOfflineQueue } from "@/lib/offline-queue";

export default function SettingsPage() {
  const { theme, toggle } = useTheme();
  const { user, logout, changePassword, deleteAccount, isLoading, error, success, clearMessages } = useAuth();

  const [feedbackTitle, setFeedbackTitle] = useState("");
  const [feedbackBody, setFeedbackBody] = useState("");
  const [feedbackType, setFeedbackType] = useState<"bug" | "feature" | "praise" | "other">("bug");
  const [submittingFeedback, setSubmittingFeedback] = useState(false);

  const [currentPassword, setCurrentPassword] = useState("");
  const [newPassword, setNewPassword] = useState("");

  async function handleSubmitFeedback() {
    if (!feedbackTitle.trim()) return;
    setSubmittingFeedback(true);
    try {
      await getFeedbackClient().submitWithScreenshot({
        type: feedbackType,
        title: feedbackTitle.trim(),
        body: feedbackBody.trim() || undefined,
        platform: "web",
      });
      toast.success("Feedback submitted");
      setFeedbackTitle("");
      setFeedbackBody("");
    } catch (err) {
      toast.error(err instanceof Error ? err.message : "Failed to submit feedback");
    } finally {
      setSubmittingFeedback(false);
    }
  }

  async function handleChangePassword(e: React.FormEvent) {
    e.preventDefault();
    clearMessages();
    const ok = await changePassword(currentPassword, newPassword);
    if (ok) {
      setCurrentPassword("");
      setNewPassword("");
      toast.success("Password changed");
    }
  }

  async function handleDeleteAccount() {
    const pw = prompt("Enter your password to confirm account deletion:");
    if (!pw) return;
    const ok = await deleteAccount(pw);
    if (ok) toast.success("Account deleted");
  }

  return (
    <AppShell
      title="Settings"
      description="Account, preferences, feedback, and session management."
      actions={
        <Button
          onClick={logout}
          variant="secondary"
          size="sm"
          className="border-transparent bg-[var(--nl-danger-muted)] text-[var(--nl-danger)] hover:bg-[var(--nl-danger-muted)]"
        >
          Sign out
        </Button>
      }
    >
      <section className="grid gap-4 [grid-template-columns:repeat(auto-fit,minmax(320px,1fr))]">
        {/* Profile */}
        <Card padding="md" className="grid gap-3">
          <strong>Profile</strong>
          <div className="text-[color:var(--nl-text-secondary)]">
            {user?.name ?? "—"} &middot; {user?.email ?? "—"} &middot; {user?.role ?? "—"}
          </div>
        </Card>

        {/* Appearance */}
        <Card padding="md" className="flex items-center justify-between">
          <div className="grid gap-2">
            <strong>Appearance</strong>
            <div className="text-[color:var(--nl-text-secondary)]">Switch between dark and light mode</div>
          </div>
          <Button
            onClick={toggle}
            aria-label={`Switch to ${theme === "dark" ? "light" : "dark"} mode`}
            variant="secondary"
            size="sm"
          >
            {theme === "dark" ? "Light" : "Dark"}
          </Button>
        </Card>

        {/* Change password */}
        <Card padding="md" className="grid gap-3">
          <strong>Change password</strong>
          {error && (
            <AlertBanner tone="error" role="alert">
              {error}
            </AlertBanner>
          )}
          {success && (
            <AlertBanner tone="success" role="status">
              {success}
            </AlertBanner>
          )}
          <form onSubmit={handleChangePassword} className="grid gap-3">
            <Input
              type="password"
              placeholder="Current password"
              aria-label="Current password"
              value={currentPassword}
              onChange={(e) => setCurrentPassword(e.target.value)}
              required
            />
            <Input
              type="password"
              placeholder="New password"
              aria-label="New password"
              minLength={8}
              value={newPassword}
              onChange={(e) => setNewPassword(e.target.value)}
              required
            />
            <Button type="submit" disabled={isLoading} loading={isLoading} className="justify-self-start">
              Update password
            </Button>
          </form>
        </Card>

        {/* Danger zone */}
        <Card padding="md" className="grid gap-3">
          <strong>Danger zone</strong>
          <Button
            onClick={handleDeleteAccount}
            variant="secondary"
            className="justify-self-start border-transparent bg-[var(--nl-danger-muted)] text-[var(--nl-danger)] hover:bg-[var(--nl-danger-muted)]"
          >
            Delete account
          </Button>
        </Card>
      </section>

      <Card padding="md" className="mt-4 grid gap-3">
        <strong>Connect your agent (MCP)</strong>
        <p className="m-0 text-[length:var(--nl-fs-sm)] text-[color:var(--nl-text-secondary)]">
          Use your platform access token with the shared MCP server on port 4007. Point tools at the NoteLett backend and product id{" "}
          <code>{PRODUCT_ID}</code>.
        </p>
        <pre className="m-0 overflow-auto whitespace-pre-wrap rounded-[var(--nl-radius-sm)] bg-[color:var(--nl-surface-muted)] p-3 text-[length:var(--nl-fs-sm)]">
          {`Notes API base: ${NOTES_API_URL}
Platform API: ${PLATFORM_SERVICE_URL}
MCP API base: ${MCP_SERVER_URL}

# Example Cursor / Claude MCP entry (adjust to your installer):
# "mcpServers": {
#   "notelett": { "url": "${MCP_SERVER_URL}" }
# }`}
        </pre>
        <p className="m-0 text-[length:var(--nl-fs-sm)] text-[color:var(--nl-text-secondary)]">
          Deep links for tools: see <code>docs/DEEP_LINKS.md</code> in the repo.
        </p>
      </Card>

      <Card padding="md" className="mt-4 grid gap-3">
        <strong>API tokens for automation</strong>
        <p className="m-0 text-[length:var(--nl-fs-sm)] text-[color:var(--nl-text-secondary)]">
          Scoped tokens for MCP or CI are provisioned through the ByteLyst platform when your tenant enables them. This web app does not yet expose
          create/revoke; use the platform admin or CLI when available.
        </p>
      </Card>

      <Card padding="md" className="mt-4 grid gap-3">
        <strong>Offline queue</strong>
        <p className="m-0 text-[length:var(--nl-fs-sm)] text-[color:var(--nl-text-secondary)]">
          Failed writes are retried from local storage via <code>@bytelyst/offline-queue</code> (storage key{" "}
          <code>{`${PRODUCT_ID}_offline_queue`}</code>). Reload or return online to flush.
        </p>
        <Button
          type="button"
          variant="secondary"
          className="justify-self-start"
          onClick={() => {
            try {
              getOfflineQueue();
              toast.success("Offline queue is available in this build");
            } catch {
              toast.error("Offline queue unavailable");
            }
          }}
        >
          Verify offline queue
        </Button>
      </Card>

      {/* Feedback */}
      <Card padding="md" className="mt-4 grid gap-3">
        <strong>Send feedback</strong>
        <div className="grid gap-3 [grid-template-columns:140px_1fr]">
          <Select
            value={feedbackType}
            onChange={(e) => setFeedbackType(e.target.value as typeof feedbackType)}
            aria-label="Feedback type"
            options={[
              { value: "bug", label: "Bug" },
              { value: "feature", label: "Feature request" },
              { value: "praise", label: "Praise" },
              { value: "other", label: "Other" },
            ]}
          />
          <Input
            placeholder="Title"
            aria-label="Feedback title"
            value={feedbackTitle}
            onChange={(e) => setFeedbackTitle(e.target.value)}
          />
        </div>
        <Textarea
          placeholder="Details (optional)"
          aria-label="Feedback details"
          rows={3}
          value={feedbackBody}
          onChange={(e) => setFeedbackBody(e.target.value)}
          className="resize-y"
        />
        <Button
          onClick={handleSubmitFeedback}
          disabled={submittingFeedback || !feedbackTitle.trim()}
          loading={submittingFeedback}
          className="justify-self-start"
        >
          Send feedback
        </Button>
      </Card>
    </AppShell>
  );
}