import { useState } from "react";
import { Exit } from "effect";
import * as AsyncResult from "effect/unstable/reactivity/AsyncResult";
import { useAtomSet, useAtomValue } from "@effect/atom-react";
import { toast } from "sonner";
import { apiKeyWriteKeys } from "../api/reactivity-keys";
import { trackEvent } from "../api/analytics";
import { apiKeysAtom, createApiKey, revokeApiKey } from "../api/account-atoms";
import { Button } from "../components/button";
import { PageContainer, PageHeader } from "../components/page";
import { CopyButton } from "../components/copy-button";
import {
  Dialog,
  DialogClose,
  DialogContent,
  DialogDescription,
  DialogFooter,
  DialogHeader,
  DialogTitle,
} from "../components/dialog";
import { Input } from "../components/input";
import { Label } from "../components/label";

// ---------------------------------------------------------------------------
// Shared API-keys page. Reads/writes the provider-neutral `/account/api-keys`
// surface, so it works identically on cloud (WorkOS) and self-host (Better
// Auth). API keys are how a user authenticates the Executor API + MCP endpoint
// from scripts/agents (Authorization: Bearer <key>).
// ---------------------------------------------------------------------------

type ApiKeySummary = {
  readonly id: string;
  readonly name: string;
  readonly obfuscatedValue: string;
  readonly createdAt: string;
  readonly lastUsedAt: string | null;
};

type CreatedKey = ApiKeySummary & { readonly value: string };

const formatDate = (value: string | null): string => {
  if (!value) return "Never";
  const date = new Date(value);
  return Number.isNaN(date.getTime())
    ? value
    : new Intl.DateTimeFormat(undefined, {
        month: "short",
        day: "numeric",
        year: "numeric",
      }).format(date);
};

const defaultApiKeyName = (): string =>
  `API key ${new Intl.DateTimeFormat(undefined, {
    month: "short",
    day: "numeric",
    year: "numeric",
  }).format(new Date())}`;

export function ApiKeysPage() {
  const result = useAtomValue(apiKeysAtom);
  const doCreate = useAtomSet(createApiKey, { mode: "promiseExit" });
  const doRevoke = useAtomSet(revokeApiKey, { mode: "promiseExit" });
  const [createOpen, setCreateOpen] = useState(false);
  const [name, setName] = useState("");
  const [createdKey, setCreatedKey] = useState<CreatedKey | null>(null);
  const [creating, setCreating] = useState(false);
  const [revokingId, setRevokingId] = useState<string | null>(null);

  const handleCreate = async () => {
    const trimmed = name.trim();
    if (!trimmed) return;
    setCreating(true);
    const exit = await doCreate({ payload: { name: trimmed }, reactivityKeys: apiKeyWriteKeys });
    setCreating(false);
    trackEvent("api_key_created", { success: Exit.isSuccess(exit) });
    if (Exit.isSuccess(exit)) {
      setCreatedKey(exit.value);
      setName("");
      toast.success("API key created");
      return;
    }
    toast.error("Failed to create API key");
  };

  const handleRevoke = async (key: ApiKeySummary) => {
    setRevokingId(key.id);
    const exit = await doRevoke({ params: { apiKeyId: key.id }, reactivityKeys: apiKeyWriteKeys });
    setRevokingId(null);
    trackEvent("api_key_revoked", { success: Exit.isSuccess(exit) });
    if (Exit.isSuccess(exit)) {
      toast.success(`Revoked ${key.name}`);
      return;
    }
    toast.error("Failed to revoke API key");
  };

  const closeCreate = (open: boolean) => {
    setCreateOpen(open);
    if (!open) {
      setName("");
      setCreatedKey(null);
      setCreating(false);
    }
  };

  return (
    <PageContainer>
      <PageHeader
        title="API keys"
        description="User keys for accessing the Executor API and MCP endpoint from scripts and tools."
        actions={
          <Button
            onClick={() => {
              setName(defaultApiKeyName());
              setCreateOpen(true);
            }}
          >
            <span aria-hidden="true">+</span>
            New key
          </Button>
        }
      >
        <div className="mt-4 flex max-w-2xl items-center gap-2 rounded-md border border-border bg-card px-3 py-2">
          <code className="min-w-0 flex-1 truncate font-mono text-xs text-foreground">
            Authorization: Bearer &lt;api-key&gt;
          </code>
          <CopyButton value="Authorization: Bearer <api-key>" />
        </div>
        <p className="mt-2 max-w-2xl text-xs leading-5 text-muted-foreground">
          API keys work as PATs and have full access to your account.
        </p>
      </PageHeader>

      {AsyncResult.match(result, {
        onInitial: () => (
          <div className="rounded-md border border-border bg-card p-6 text-sm text-muted-foreground">
            Loading API keys...
          </div>
        ),
        onFailure: () => (
          <div className="rounded-md border border-border bg-card p-6 text-sm text-destructive">
            Failed to load API keys
          </div>
        ),
        onSuccess: ({ value }) =>
          value.apiKeys.length === 0 ? (
            <div className="rounded-md border border-dashed border-border bg-card p-8">
              <h2 className="text-base font-semibold text-foreground">No API keys</h2>
              <p className="mt-2 max-w-xl text-sm leading-6 text-muted-foreground">
                Create a key and send it in the Authorization Bearer header.
              </p>
            </div>
          ) : (
            <div className="overflow-hidden rounded-md border border-border bg-card">
              <div className="grid grid-cols-[1fr_auto] gap-4 border-b border-border px-4 py-3 text-xs font-medium uppercase tracking-wider text-muted-foreground md:grid-cols-[1.4fr_1fr_1fr_auto]">
                <span>Name</span>
                <span className="hidden md:block">Created</span>
                <span className="hidden md:block">Last used</span>
                <span className="text-right">Actions</span>
              </div>
              {value.apiKeys.map((key: ApiKeySummary) => (
                <div
                  key={key.id}
                  className="grid grid-cols-[1fr_auto] items-center gap-4 border-b border-border px-4 py-4 last:border-b-0 md:grid-cols-[1.4fr_1fr_1fr_auto]"
                >
                  <div className="min-w-0">
                    <p className="truncate text-sm font-medium text-foreground">{key.name}</p>
                    <p className="mt-1 font-mono text-xs text-muted-foreground">
                      {key.obfuscatedValue}
                    </p>
                  </div>
                  <p className="hidden text-sm text-muted-foreground md:block">
                    {formatDate(key.createdAt)}
                  </p>
                  <p className="hidden text-sm text-muted-foreground md:block">
                    {formatDate(key.lastUsedAt)}
                  </p>
                  <Button
                    variant="ghost"
                    size="icon-sm"
                    onClick={() => handleRevoke(key)}
                    disabled={revokingId === key.id}
                    title={`Revoke ${key.name}`}
                    className="text-muted-foreground hover:text-destructive"
                  >
                    <span aria-hidden="true">×</span>
                  </Button>
                </div>
              ))}
            </div>
          ),
      })}

      <Dialog open={createOpen} onOpenChange={closeCreate}>
        <DialogContent className="sm:max-w-[480px]">
          <DialogHeader>
            <DialogTitle className="font-display text-xl">Create API key</DialogTitle>
            <DialogDescription className="text-sm leading-relaxed">
              The key will act as your user in the current organization.
            </DialogDescription>
          </DialogHeader>

          {createdKey ? (
            <div className="grid gap-4 py-3">
              <div className="grid gap-1.5">
                <Label className="text-sm font-medium text-foreground">New key</Label>
                <div className="flex items-center gap-2">
                  <Input
                    value={createdKey.value}
                    readOnly
                    className="font-mono text-xs"
                    data-ph-mask
                  />
                  <CopyButton
                    value={createdKey.value}
                    onCopy={() => trackEvent("api_key_copied", { kind: "value" })}
                  />
                </div>
              </div>
              <div className="grid gap-1.5">
                <Label className="text-sm font-medium text-foreground">Bearer header</Label>
                <div className="flex items-center gap-2">
                  <Input
                    value={`Authorization: Bearer ${createdKey.value}`}
                    readOnly
                    className="font-mono text-xs"
                    data-ph-mask
                  />
                  <CopyButton
                    value={`Authorization: Bearer ${createdKey.value}`}
                    onCopy={() => trackEvent("api_key_copied", { kind: "bearer_header" })}
                  />
                </div>
              </div>
              <p className="text-sm leading-6 text-muted-foreground">
                Send this value as a Bearer token. It is only shown once.
              </p>
            </div>
          ) : (
            <div className="grid gap-4 py-3">
              <div className="grid gap-1.5">
                <Label htmlFor="api-key-name" className="text-sm font-medium text-foreground">
                  Name
                </Label>
                <Input
                  id="api-key-name"
                  value={name}
                  onChange={(event) => setName(event.target.value)}
                  placeholder="Local CLI"
                  maxLength={80}
                  autoFocus
                />
              </div>
            </div>
          )}

          <DialogFooter>
            <DialogClose asChild>
              <Button variant="ghost">Close</Button>
            </DialogClose>
            {!createdKey && (
              <Button onClick={handleCreate} disabled={creating || !name.trim()}>
                {creating ? "Creating..." : "Create key"}
              </Button>
            )}
          </DialogFooter>
        </DialogContent>
      </Dialog>
    </PageContainer>
  );
}