"use client";

import * as React from "react";
import * as DialogPrimitive from "@radix-ui/react-dialog";
import { GitBranch, Loader2, Plus, X } from "lucide-react";
import { useParams } from "next/navigation";

import { Button } from "@/components/ui/button";
import { Input } from "@/components/ui/input";
import { api } from "@/lib/trpc";
import type { ForgeType } from "@tasks/shared/connected-repos";

const FORGE_LABELS: Record<ForgeType, string> = {
  github: "GitHub",
  forgejo: "Forgejo / Gitea",
  gitlab: "GitLab",
  bitbucket: "Bitbucket",
};

type ConnectForm = {
  remoteUrl: string;
  displayName: string;
  tokenEnvVar: string;
};

const EMPTY_FORM: ConnectForm = {
  remoteUrl: "",
  displayName: "",
  tokenEnvVar: "",
};

export default function ConnectedReposSettingsPage() {
  const params = useParams();
  const workspaceSlug = params?.workspaceSlug as string | undefined;
  const utils = api.useUtils();

  const listQuery = api.connectedRepos.list.useQuery(
    { workspace: workspaceSlug ?? "" },
    { enabled: Boolean(workspaceSlug) },
  );

  const [dialogOpen, setDialogOpen] = React.useState(false);
  const [form, setForm] = React.useState<ConnectForm>(EMPTY_FORM);
  const [parsedPreview, setParsedPreview] = React.useState<{
    forgeType: ForgeType;
    owner: string;
    repoName: string;
    apiBaseUrl: string;
  } | null>(null);
  const [testResult, setTestResult] = React.useState<Record<string, string>>({});

  const parseMut = api.connectedRepos.parseRemote.useMutation({
    onSuccess: (parsed) => {
      setParsedPreview({
        forgeType: parsed.forgeType,
        owner: parsed.owner,
        repoName: parsed.repoName,
        apiBaseUrl: parsed.apiBaseUrl,
      });
      setForm((prev) => ({
        ...prev,
        displayName: prev.displayName || `${parsed.owner}/${parsed.repoName}`,
      }));
    },
    onError: () => setParsedPreview(null),
  });

  const connectMut = api.connectedRepos.connect.useMutation({
    onSuccess: () => {
      void utils.connectedRepos.list.invalidate();
      setDialogOpen(false);
      setForm(EMPTY_FORM);
      setParsedPreview(null);
    },
  });

  const disconnectMut = api.connectedRepos.disconnect.useMutation({
    onSuccess: () => void utils.connectedRepos.list.invalidate(),
  });

  const testMut = api.connectedRepos.testConnection.useMutation({
    onSuccess: (result, vars) => {
      setTestResult((prev) => ({
        ...prev,
        [vars.repoId]: result.ok
          ? `OK — default branch ${result.defaultBranch} (${result.latencyMs}ms)`
          : `Failed: ${result.error ?? "unknown"}`,
      }));
      if (result.ok) {
        void utils.connectedRepos.list.invalidate();
      }
    },
  });

  const canManage = listQuery.data?.canManage ?? false;
  const repos = listQuery.data?.repos ?? [];

  const openCreate = () => {
    setForm(EMPTY_FORM);
    setParsedPreview(null);
    setDialogOpen(true);
  };

  const handleParse = () => {
    if (!workspaceSlug || !form.remoteUrl.trim()) {
      return;
    }
    parseMut.mutate({ workspace: workspaceSlug, remoteUrl: form.remoteUrl.trim() });
  };

  const handleConnect = () => {
    if (!workspaceSlug || !form.remoteUrl.trim()) {
      return;
    }
    connectMut.mutate({
      workspace: workspaceSlug,
      remoteUrl: form.remoteUrl.trim(),
      displayName: form.displayName.trim() || undefined,
      tokenEnvVar: form.tokenEnvVar.trim() || null,
    });
  };

  return (
    <div className="mx-auto max-w-4xl px-6 py-8">
      <div className="mb-6 flex items-start justify-between gap-4">
        <div>
          <h1 className="text-2xl font-semibold tracking-tight">Connected repos</h1>
          <p className="mt-1 text-sm text-muted-foreground">
            Paste a git remote URL to link Forgejo, GitHub, or other forges. API tokens are
            referenced by env var name — never stored in the database.
          </p>
        </div>
        {canManage && (
          <Button type="button" onClick={openCreate}>
            <Plus className="mr-2 size-4" />
            Connect repo
          </Button>
        )}
      </div>

      {listQuery.isLoading ? (
        <div className="flex items-center gap-2 text-sm text-muted-foreground">
          <Loader2 className="size-4 animate-spin" />
          Loading repos…
        </div>
      ) : repos.length === 0 ? (
        <div className="rounded-lg border border-dashed border-border p-8 text-center text-sm text-muted-foreground">
          No connected repos yet.
          {canManage && " Connect one to prepare for orchestrator and worker automation."}
        </div>
      ) : (
        <ul className="divide-y divide-border rounded-lg border border-border">
          {repos.map((repo) => (
            <li key={repo.id} className="flex flex-col gap-3 p-4 sm:flex-row sm:items-center">
              <div className="min-w-0 flex-1">
                <div className="flex items-center gap-2">
                  <GitBranch className="size-4 shrink-0 text-muted-foreground" />
                  <span className="font-medium">{repo.displayName}</span>
                  <span className="rounded bg-muted px-2 py-0.5 text-xs text-muted-foreground">
                    {FORGE_LABELS[repo.forgeType]}
                  </span>
                </div>
                <p className="mt-1 truncate text-sm text-muted-foreground">{repo.gitRemoteUrl}</p>
                <p className="mt-0.5 text-xs text-muted-foreground">
                  {repo.owner}/{repo.repoName}
                  {repo.defaultBranch ? ` · ${repo.defaultBranch}` : ""}
                  {repo.tokenEnvVar ? ` · token: ${repo.tokenEnvVar}` : ""}
                </p>
                {testResult[repo.id] && (
                  <p className="mt-1 text-xs text-muted-foreground">{testResult[repo.id]}</p>
                )}
              </div>
              {canManage && (
                <div className="flex shrink-0 gap-2">
                  <Button
                    type="button"
                    variant="outline"
                    size="sm"
                    disabled={testMut.isPending}
                    onClick={() =>
                      workspaceSlug &&
                      testMut.mutate({ workspace: workspaceSlug, repoId: repo.id })
                    }
                  >
                    Test connection
                  </Button>
                  <Button
                    type="button"
                    variant="ghost"
                    size="sm"
                    className="text-destructive"
                    disabled={disconnectMut.isPending}
                    onClick={() =>
                      workspaceSlug &&
                      disconnectMut.mutate({ workspace: workspaceSlug, repoId: repo.id })
                    }
                  >
                    Disconnect
                  </Button>
                </div>
              )}
            </li>
          ))}
        </ul>
      )}

      <DialogPrimitive.Root open={dialogOpen} onOpenChange={setDialogOpen}>
        <DialogPrimitive.Portal>
          <DialogPrimitive.Overlay className="fixed inset-0 z-50 bg-black/50" />
          <DialogPrimitive.Content className="fixed left-1/2 top-1/2 z-50 w-full max-w-lg -translate-x-1/2 -translate-y-1/2 rounded-lg border border-border bg-background p-6 shadow-lg">
            <div className="mb-4 flex items-center justify-between">
              <DialogPrimitive.Title className="text-lg font-semibold">
                Connect repository
              </DialogPrimitive.Title>
              <DialogPrimitive.Close asChild>
                <button type="button" className="rounded p-1 hover:bg-muted" aria-label="Close">
                  <X className="size-4" />
                </button>
              </DialogPrimitive.Close>
            </div>

            <div className="space-y-4">
              <div>
                <label className="mb-1 block text-sm font-medium" htmlFor="remote-url">
                  Git remote URL
                </label>
                <div className="flex gap-2">
                  <Input
                    id="remote-url"
                    placeholder="https://github.com/org/repo or git@host:org/repo.git"
                    value={form.remoteUrl}
                    onChange={(e) => setForm((f) => ({ ...f, remoteUrl: e.target.value }))}
                  />
                  <Button
                    type="button"
                    variant="outline"
                    disabled={parseMut.isPending || !form.remoteUrl.trim()}
                    onClick={handleParse}
                  >
                    Parse
                  </Button>
                </div>
                {parseMut.error && (
                  <p className="mt-1 text-xs text-destructive">{parseMut.error.message}</p>
                )}
              </div>

              {parsedPreview && (
                <div className="rounded-md bg-muted/50 p-3 text-sm">
                  <p>
                    Detected{" "}
                    <span className="font-medium">{FORGE_LABELS[parsedPreview.forgeType]}</span> —{" "}
                    {parsedPreview.owner}/{parsedPreview.repoName}
                  </p>
                  <p className="mt-1 text-xs text-muted-foreground">{parsedPreview.apiBaseUrl}</p>
                </div>
              )}

              <div>
                <label className="mb-1 block text-sm font-medium" htmlFor="display-name">
                  Display name
                </label>
                <Input
                  id="display-name"
                  value={form.displayName}
                  onChange={(e) => setForm((f) => ({ ...f, displayName: e.target.value }))}
                />
              </div>

              <div>
                <label className="mb-1 block text-sm font-medium" htmlFor="token-env">
                  API token env var (optional)
                </label>
                <Input
                  id="token-env"
                  placeholder="GITHUB_TOKEN"
                  value={form.tokenEnvVar}
                  onChange={(e) => setForm((f) => ({ ...f, tokenEnvVar: e.target.value }))}
                />
              </div>

              <div className="flex justify-end gap-2 pt-2">
                <DialogPrimitive.Close asChild>
                  <Button type="button" variant="outline">
                    Cancel
                  </Button>
                </DialogPrimitive.Close>
                <Button
                  type="button"
                  disabled={connectMut.isPending || !form.remoteUrl.trim()}
                  onClick={handleConnect}
                >
                  {connectMut.isPending ? (
                    <>
                      <Loader2 className="mr-2 size-4 animate-spin" />
                      Connecting…
                    </>
                  ) : (
                    "Connect"
                  )}
                </Button>
              </div>
              {connectMut.error && (
                <p className="text-xs text-destructive">{connectMut.error.message}</p>
              )}
            </div>
          </DialogPrimitive.Content>
        </DialogPrimitive.Portal>
      </DialogPrimitive.Root>
    </div>
  );
}