import { useEffect, useState } from 'react';
import { toast } from 'sonner';
import { useClient } from 'hooks/useClient';
import { Button } from '@/components/ui/button';
import { Input } from '@/components/ui/input';
import { Label } from '@/components/ui/label';
import { Select, SelectContent, SelectItem, SelectTrigger, SelectValue } from '@/components/ui/select';

// Atelier's providers: which adapter, which model, whose key.
//
// A PANEL, in the plugin, not a section in Officer's settings. It was the latter for one day, because the
// extraction brief said so — and `IntegrationsSettings/index.tsx` already carried the opposite rule,
// written when email was extracted: "A plugin contributes panels, not settings sections, so it now lives
// inside the email workspace itself."
//
// The brief was wrong and the precedent was right. Settings in the platform mean the plugin is not
// self-contained: it cannot be configured on an older platform, and uninstalling leaves a dead section
// behind that someone has to delete by hand. Neither is true of a panel.
// (which adapter, which model, whose key), the same shape as the Apify token above rather than
// something worth a dedicated working panel. Talks to /api/atelier/providers over HTTP through
// useClient(), same as every other authenticated screen — this does not import anything from
// plugins/atelier/, so it stays on the right side of "a plugin importing platform code is fine; the
// reverse is not".

type ProviderStatus = {
  id: string;
  name: string;
  adapter: string;
  model: string;
  enabled: boolean;
  is_default: boolean;
  configured: boolean;
  key_source: 'database' | 'environment' | null;
  env_var: string;
};

type Adapter = {
  name: string;
  label: string;
  models: string[];
  default_model: string;
  env_var: string;
};

export const Providers = () => {
  const client = useClient();
  const [providers, setProviders] = useState<ProviderStatus[]>([]);
  const [adapters, setAdapters] = useState<Adapter[]>([]);
  const [loading, setLoading] = useState(true);
  const [busy, setBusy] = useState<string | null>(null);
  const [keyDrafts, setKeyDrafts] = useState<Record<string, string>>({});
  const [newAdapter, setNewAdapter] = useState('');
  const [newModel, setNewModel] = useState('');

  useEffect(() => {
    Promise.all([
      client.get<{ data: ProviderStatus[] }>('/atelier/providers').then((r) => r.data),
      client.get<{ data: Adapter[] }>('/atelier/providers/adapters').then((r) => r.data),
    ])
      .then(([rows, catalogue]) => {
        setProviders(rows);
        setAdapters(catalogue);
        if (catalogue[0]) {
          setNewAdapter(catalogue[0].name);
          setNewModel(catalogue[0].default_model);
        }
      })
      .catch(() => toast.error('Failed to load Atelier providers'))
      .finally(() => setLoading(false));
    // eslint-disable-next-line react-hooks/exhaustive-deps
  }, []);

  const run = async (key: string, action: () => Promise<{ data: ProviderStatus[] }>) => {
    setBusy(key);
    try {
      setProviders((await action()).data);
    } catch {
      toast.error('That did not work — check the server logs');
    } finally {
      setBusy(null);
    }
  };

  const modelsFor = (adapterName: string) => adapters.find((a) => a.name === adapterName)?.models ?? [];

  const patch = (id: string, values: Record<string, unknown>) =>
    run(id, () => client.patch<{ data: ProviderStatus[] }>(`/atelier/providers/${id}`, values));

  const saveKey = async (id: string) => {
    const apiKey = keyDrafts[id]?.trim();
    if (!apiKey) return;
    await patch(id, { apiKey });
    setKeyDrafts((current) => ({ ...current, [id]: '' }));
    toast.success('Key saved');
  };

  const add = () =>
    run('new', () =>
      client.post<{ data: ProviderStatus[] }>('/atelier/providers', { adapter: newAdapter, model: newModel }),
    );

  const remove = (id: string) => run(id, () => client.delete<{ data: ProviderStatus[] }>(`/atelier/providers/${id}`));

  if (loading) return null;

  // `content-start`: a grid told to fill its height stretches its rows, which would pull the two cards
  // tall and leave their text floating in the middle of them.
  return (
    <div className="grid h-full content-start gap-5 overflow-y-auto p-4">
      <div className="grid gap-3 rounded-lg border border-duck-dark/10 p-4 dark:border-foreground/10">
        <p className="text-sm font-medium text-duck-dark dark:text-foreground">Add a provider</p>
        <p className="text-xs text-duck-dark/50 dark:text-foreground/50">
          An adapter and a model. The same adapter can back several providers.
        </p>
        <div className="flex flex-wrap items-end gap-3">
          <Label className="grid gap-2">
            <span className="text-xs text-duck-dark/70 dark:text-foreground/70">Adapter</span>
            <Select
              value={newAdapter}
              onValueChange={(value) => {
                setNewAdapter(value);
                setNewModel(adapters.find((a) => a.name === value)?.default_model ?? '');
              }}
            >
              <SelectTrigger className="w-44">
                <SelectValue />
              </SelectTrigger>
              <SelectContent>
                {adapters.map((adapter) => (
                  <SelectItem key={adapter.name} value={adapter.name}>
                    {adapter.label}
                  </SelectItem>
                ))}
              </SelectContent>
            </Select>
          </Label>

          <Label className="grid gap-2">
            <span className="text-xs text-duck-dark/70 dark:text-foreground/70">Model</span>
            <Select value={newModel} onValueChange={setNewModel}>
              <SelectTrigger className="w-56">
                <SelectValue />
              </SelectTrigger>
              <SelectContent>
                {modelsFor(newAdapter).map((model) => (
                  <SelectItem key={model} value={model}>
                    {model}
                  </SelectItem>
                ))}
              </SelectContent>
            </Select>
          </Label>

          <Button onClick={add} disabled={busy === 'new' || !newAdapter}>
            Add
          </Button>
        </div>
      </div>

      {providers.length === 0 ? (
        <p className="text-sm text-duck-dark/40 dark:text-foreground/40">No providers yet. Add one above.</p>
      ) : (
        providers.map((provider) => {
          const busyHere = busy === provider.id;
          return (
            <div
              key={provider.id}
              className="grid gap-3 rounded-lg border border-duck-dark/10 p-4 dark:border-foreground/10"
            >
              <div className="flex flex-wrap items-center justify-between gap-3">
                <div>
                  <p className="flex items-center gap-2 text-sm font-medium text-duck-dark dark:text-foreground">
                    {provider.name}
                    {provider.is_default && (
                      <span className="rounded bg-duck-yellow/20 px-2 py-0.5 text-[10px] uppercase tracking-wider text-duck-teal">
                        default
                      </span>
                    )}
                  </p>
                  <p className="text-xs text-duck-dark/50 dark:text-foreground/50">{describe(provider)}</p>
                </div>
                <div className="flex gap-2">
                  {!provider.is_default && (
                    <Button
                      variant="ghost"
                      size="sm"
                      disabled={busyHere}
                      onClick={() => patch(provider.id, { isDefault: true })}
                    >
                      Make default
                    </Button>
                  )}
                  <Button
                    variant={provider.enabled ? 'secondary' : 'default'}
                    size="sm"
                    disabled={busyHere}
                    onClick={() => patch(provider.id, { enabled: !provider.enabled })}
                  >
                    {provider.enabled ? 'Enabled' : 'Disabled'}
                  </Button>
                </div>
              </div>

              <div className="grid gap-2">
                <Label htmlFor={`${provider.id}-key`} className="text-xs text-duck-dark/70 dark:text-foreground/70">
                  API key
                </Label>
                {/* A form, so Enter saves. Pasting a key and pressing Enter is the strongest habit there
                    is in a password field, and outside a form it silently does nothing — which reads as
                    "the key did not save". TODO.md tracks nineteen panels with this same defect; this is
                    not the twentieth. */}
                <form
                  className="flex gap-2"
                  onSubmit={(ev) => {
                    ev.preventDefault();
                    void saveKey(provider.id);
                  }}
                >
                  <Input
                    id={`${provider.id}-key`}
                    type="password"
                    autoComplete="off"
                    placeholder={provider.configured ? 'A key is set — type a new one to replace it' : 'sk-…'}
                    value={keyDrafts[provider.id] ?? ''}
                    onChange={(ev) => setKeyDrafts((current) => ({ ...current, [provider.id]: ev.target.value }))}
                  />
                  <Button type="submit" disabled={busyHere || !keyDrafts[provider.id]?.trim()}>
                    Save
                  </Button>
                </form>
                <p className="text-xs text-duck-dark/40 dark:text-foreground/40">
                  Stored encrypted. The server never sends a key back, so this field always starts empty.
                </p>
              </div>

              <Button
                variant="ghost"
                size="sm"
                disabled={busyHere}
                onClick={() => remove(provider.id)}
                className="w-fit"
              >
                Delete provider
              </Button>
            </div>
          );
        })
      )}
    </div>
  );
};

function describe(provider: ProviderStatus): string {
  const base = `${provider.adapter} · ${provider.model}`;
  if (!provider.configured) return `${base} — no key. Set one here, or as ${provider.env_var}.`;
  if (provider.key_source === 'environment') return `${base} — key from ${provider.env_var}.`;
  return `${base} — key stored and encrypted.`;
}