"use client"

import { useState } from "react"
import { ExternalLink, KeyRound, Plus, Trash2 } from "lucide-react"
import { Button } from "@/components/ui/button"
import {
  Card,
  CardContent,
  CardDescription,
  CardHeader,
  CardTitle,
} from "@/components/ui/card"
import { Input } from "@/components/ui/input"
import { Label } from "@/components/ui/label"
import { ApiTokenCreatedDialog } from "@/components/gmail/settings/automation/api-token-created-dialog"
import { ApiTokenDriveScopeEditor } from "@/components/gmail/settings/automation/api-token-drive-scope-editor"
import { ApiTokenMailScopeEditor } from "@/components/gmail/settings/automation/api-token-mail-scope-editor"
import { ApiTokenPermissionEditor } from "@/components/gmail/settings/automation/api-token-permission-editor"
import { AutomationTabMasonry } from "@/components/gmail/settings/automation/automation-tab-masonry"
import { SettingsSyncBanner } from "@/components/gmail/settings/settings-sync-banner"
import {
  useApiTokens,
  useCreateApiToken,
  useRevokeApiToken,
} from "@/lib/api/hooks/use-api-tokens"
import { useAuthReady } from "@/lib/api/use-auth-ready"
import type { ApiTokenCreated } from "@/lib/api/types"
import {
  defaultDriveScope,
  defaultMailScope,
  emptyPermissionGrants,
  hasAnyPermission,
  hasDrivePermissions,
  hasMailPermissions,
  summarizePermissions,
  type ApiTokenPermissionGrant,
} from "@/lib/mail-automation/api-token-permissions"

function formatDate(value?: string) {
  if (!value) return "—"
  try {
    return new Intl.DateTimeFormat("fr-FR", {
      dateStyle: "medium",
      timeStyle: "short",
    }).format(new Date(value))
  } catch {
    return value
  }
}

export function ApiTokensPanel() {
  const { ready, authenticated } = useAuthReady()
  const { data: tokens = [], isFetching, isError, refetch, isPending } = useApiTokens()
  const createToken = useCreateApiToken()
  const revokeToken = useRevokeApiToken()

  const [name, setName] = useState("")
  const [permissions, setPermissions] = useState<ApiTokenPermissionGrant[]>(emptyPermissionGrants)
  const [mailScope, setMailScope] = useState(defaultMailScope)
  const [driveScope, setDriveScope] = useState(defaultDriveScope)
  const [created, setCreated] = useState<ApiTokenCreated | null>(null)
  const [createdOpen, setCreatedOpen] = useState(false)

  const showInitialLoad = ready && authenticated && isPending && tokens.length === 0
  const mailScopeEnabled = hasMailPermissions(permissions)
  const driveScopeEnabled = hasDrivePermissions(permissions)

  const canSubmit =
    name.trim().length > 0 &&
    hasAnyPermission(permissions) &&
    (!mailScopeEnabled || mailScope.all_accounts || mailScope.account_ids.length > 0) &&
    (!driveScopeEnabled || driveScope.all_folders || driveScope.folder_paths.length > 0)

  async function handleCreate() {
    const result = await createToken.mutateAsync({
      name: name.trim(),
      permissions: permissions.filter((g) => g.read || g.write),
      mail_scope: mailScopeEnabled ? mailScope : defaultMailScope(),
      drive_scope: driveScopeEnabled ? driveScope : defaultDriveScope(),
    })
    setCreated(result)
    setCreatedOpen(true)
    setName("")
    setPermissions(emptyPermissionGrants())
    setMailScope(defaultMailScope())
    setDriveScope(defaultDriveScope())
  }

  return (
    <div className="space-y-4">
      <SettingsSyncBanner isFetching={isFetching} isError={isError} onRetry={() => refetch()} />

      <AutomationTabMasonry columns={2}>
        <Card className="lg:col-span-2">
          <CardHeader>
            <CardTitle className="text-base">Nouveau token</CardTitle>
            <CardDescription>
              Jetons fine-grained pour agents IA, scripts et intégrations externes. Choisissez
              les permissions, puis restreignez le périmètre mail et Drive si nécessaire.
            </CardDescription>
          </CardHeader>
          <CardContent className="space-y-5">
            <p className="text-xs text-muted-foreground">
              Documentation API interactive :{" "}
              <a
                href="/api/docs"
                target="_blank"
                rel="noopener noreferrer"
                className="inline-flex items-center gap-1 text-[#1a73e8] hover:underline"
              >
                /api/docs
                <ExternalLink className="size-3" />
              </a>
            </p>
            <div className="space-y-1">
              <Label className="text-xs">Nom</Label>
              <Input
                value={name}
                onChange={(e) => setName(e.target.value)}
                placeholder="Agent tri boîte support"
              />
            </div>

            <ApiTokenPermissionEditor grants={permissions} onChange={setPermissions} />

            <div className="grid gap-4 lg:grid-cols-2">
              <ApiTokenMailScopeEditor
                scope={mailScope}
                onChange={setMailScope}
                enabled={mailScopeEnabled}
              />
              <ApiTokenDriveScopeEditor
                scope={driveScope}
                onChange={setDriveScope}
                enabled={driveScopeEnabled}
              />
            </div>

            <Button
              type="button"
              disabled={!canSubmit || createToken.isPending}
              className="w-full sm:w-auto"
              onClick={handleCreate}
            >
              <Plus className="mr-1.5 size-3.5" />
              Générer le token
            </Button>
          </CardContent>
        </Card>

        <Card>
          <CardHeader>
            <CardTitle className="flex items-center gap-2 text-base">
              <KeyRound className="size-4" />
              Tokens actifs
            </CardTitle>
            <CardDescription>
              Révoquez un jeton compromis ou inutilisé à tout moment.
            </CardDescription>
          </CardHeader>
          <CardContent>
            {showInitialLoad ? (
              <p className="text-sm text-muted-foreground">Chargement…</p>
            ) : tokens.length === 0 ? (
              <p className="text-sm text-muted-foreground">Aucun token API pour le moment.</p>
            ) : (
              <ul className="divide-y divide-border rounded-lg border border-border">
                {tokens.map((token) => {
                  const summary = summarizePermissions(token.permissions)
                  return (
                    <li
                      key={token.id}
                      className="flex items-start justify-between gap-3 px-3 py-3"
                    >
                      <div className="min-w-0 space-y-1">
                        <p className="text-sm font-medium">{token.name}</p>
                        <p className="font-mono text-xs text-muted-foreground">
                          {token.token_prefix}…
                        </p>
                        {summary.length > 0 && (
                          <ul className="text-xs text-muted-foreground">
                            {summary.slice(0, 4).map((line) => (
                              <li key={line}>{line}</li>
                            ))}
                            {summary.length > 4 && (
                              <li>+ {summary.length - 4} autre(s) permission(s)</li>
                            )}
                          </ul>
                        )}
                        <p className="text-xs text-muted-foreground">
                          Créé {formatDate(token.created_at)}
                          {token.last_used_at
                            ? ` · Dernière utilisation ${formatDate(token.last_used_at)}`
                            : ""}
                        </p>
                      </div>
                      <Button
                        type="button"
                        variant="ghost"
                        size="icon"
                        disabled={revokeToken.isPending}
                        onClick={() => revokeToken.mutate(token.id)}
                        aria-label={`Révoquer ${token.name}`}
                      >
                        <Trash2 className="size-4" />
                      </Button>
                    </li>
                  )
                })}
              </ul>
            )}
          </CardContent>
        </Card>

        <Card>
          <CardContent className="space-y-3">
            <CardTitle className="text-base">Bonnes pratiques</CardTitle>
            <div className="space-y-2 text-sm text-muted-foreground">
              <p>
                Limitez chaque token au périmètre strict nécessaire (principe du moindre privilège).
              </p>
              <p>
                Le secret n&apos;est affiché qu&apos;une fois à la création — stockez-le dans un
                gestionnaire de secrets, jamais dans le code source.
              </p>
              <p>
                La permission « Super admin — Tokens API » permet aussi de gérer d&apos;autres
                tokens via l&apos;API — réservez-la aux agents d&apos;administration de confiance.
              </p>
              <p>
                Préférez des tokens dédiés par agent ou intégration pour faciliter la révocation.
              </p>
            </div>
          </CardContent>
        </Card>
      </AutomationTabMasonry>

      <ApiTokenCreatedDialog
        created={created}
        open={createdOpen}
        onOpenChange={setCreatedOpen}
      />
    </div>
  )
}
