"use client";

import { useState } from "react";
import { Loader2, Plus, AlertCircle, CheckCircle2 } from "lucide-react";
import { Button } from "@/components/ui/button";
import { Input } from "@/components/ui/input";
import { Label } from "@/components/ui/label";
import {
  Dialog,
  DialogContent,
  DialogDescription,
  DialogFooter,
  DialogHeader,
  DialogTitle,
  DialogTrigger,
} from "@/components/ui/dialog";
import { cn } from "@/lib/utils";
import { parseChannelInput } from "@/lib/utils/channel-parser";
import { channelsApi, placementsApi } from "@/lib/api";
import type { Placement } from "@/lib/types/api";

interface AddChannelDialogProps {
  workspaceId: string;
  projectId: string;
  existingPlacements: Placement[];
  onSuccess: () => void;
  children?: React.ReactNode;
}

export function AddChannelDialog({
  workspaceId,
  projectId,
  existingPlacements,
  onSuccess,
  children,
}: AddChannelDialogProps) {
  const [open, setOpen] = useState(false);
  const [inputValue, setInputValue] = useState("");
  const [loading, setLoading] = useState(false);
  const [error, setError] = useState<string | null>(null);
  const [success, setSuccess] = useState(false);

  const existingUsernames = new Set(
    existingPlacements
      .map((p) => p.channel.username?.toLowerCase())
      .filter(Boolean)
  );

  const handleSubmit = async (e: React.FormEvent) => {
    e.preventDefault();
    setError(null);
    setSuccess(false);

    const username = parseChannelInput(inputValue);

    if (!username) {
      setError("Не удалось распознать username из ссылки");
      return;
    }

    if (existingUsernames.has(username.toLowerCase())) {
      setError("Этот канал уже добавлен в проект");
      return;
    }

    try {
      setLoading(true);

      const username = parseChannelInput(inputValue);

      if (!username) {
        setError("Не удалось распознать username из ссылки");
        return;
      }

      if (existingUsernames.has(username.toLowerCase())) {
        setError("Этот канал уже добавлен в проект");
        return;
      }

      // Step 1: Find channel by username to get channel_id
      const channelsResponse = await channelsApi.list({ username });
      const channel = channelsResponse.items.find(
        (c) => c.username?.toLowerCase() === username.toLowerCase()
      );

      if (!channel) {
        setError("Канал не найден в каталоге");
        return;
      }

      // Step 2: Create empty placement with channel_id
      await placementsApi.createBulk(workspaceId, projectId, {
        channels: [
          {
            channel_id: channel.id,
            status: "Без статуса",
          },
        ],
      });

      setSuccess(true);
      setInputValue("");

      // Close dialog after short delay
      setTimeout(() => {
        setOpen(false);
        setSuccess(false);
        onSuccess();
      }, 1500);
    } catch (err: any) {
      console.error("Failed to add channel:", err);
      setError(err.detail || "Не удалось добавить канал");
    } finally {
      setLoading(false);
    }
  };

  const handleOpenChange = (isOpen: boolean) => {
    if (!isOpen) {
      setInputValue("");
      setError(null);
      setSuccess(false);
    }
    setOpen(isOpen);
  };

  const examples = [
    "t.me/rian_ru",
    "@rian_ru",
    "telemetr.me/content/rian_ru",
    "tgstat.ru/channel/@rian_ru",
  ];

  return (
    <Dialog open={open} onOpenChange={handleOpenChange}>
      <DialogTrigger asChild>{children}</DialogTrigger>
      <DialogContent>
        <DialogHeader>
          <DialogTitle>Добавить канал</DialogTitle>
          <DialogDescription>
            Введите ссылку или username канала для проверки и добавления в проект
          </DialogDescription>
        </DialogHeader>

        <form onSubmit={handleSubmit} className="space-y-4">
          <div className="space-y-2">
            <Label htmlFor="channel-input">Ссылка или username канала</Label>
            <Input
              id="channel-input"
              placeholder="https://t.me/rian_ru или @rian_ru"
              value={inputValue}
              onChange={(e) => setInputValue(e.target.value)}
              disabled={loading}
              autoComplete="off"
            />
            <p className="text-xs text-muted-foreground">
              Поддерживаются: t.me, telemetr.me, tgstat.ru, а также username с @
            </p>
          </div>

          {error && (
            <div className="flex items-center gap-2 p-3 rounded-md bg-destructive/10 text-destructive text-sm">
              <AlertCircle className="h-4 w-4 shrink-0" />
              {error}
            </div>
          )}

          {success && (
            <div className="flex items-center gap-2 p-3 rounded-md bg-emerald-100 text-emerald-700 dark:bg-emerald-900/30 dark:text-emerald-400 text-sm">
              <CheckCircle2 className="h-4 w-4 shrink-0" />
              Канал успешно добавлен!
            </div>
          )}

          <div className="space-y-2">
            <p className="text-xs text-muted-foreground">Примеры:</p>
            <div className="flex flex-wrap gap-2">
              {examples.map((example) => (
                <button
                  key={example}
                  type="button"
                  onClick={() => setInputValue(example)}
                  className="text-xs px-2 py-1 rounded-md bg-muted hover:bg-muted/80 transition-colors"
                >
                  {example}
                </button>
              ))}
            </div>
          </div>

          <DialogFooter>
            <Button
              type="button"
              variant="outline"
              onClick={() => setOpen(false)}
              disabled={loading}
            >
              Отмена
            </Button>
            <Button type="submit" disabled={loading || !inputValue.trim()}>
              {loading ? (
                <>
                  <Loader2 className="h-4 w-4 mr-2 animate-spin" />
                  Проверка...
                </>
              ) : (
                <>
                  <Plus className="h-4 w-4 mr-2" />
                  Проверить и добавить
                </>
              )}
            </Button>
          </DialogFooter>
        </form>
      </DialogContent>
    </Dialog>
  );
}