"use client";

import { useState } from "react";
import { Loader2, Filter, ArrowUpDown, X, Check, ArrowUp, ArrowDown } from "lucide-react";
import { Button } from "@/components/ui/button";
import { Input } from "@/components/ui/input";
import { Label } from "@/components/ui/label";
import { Checkbox } from "@/components/ui/checkbox";
import {
  Dialog,
  DialogContent,
  DialogDescription,
  DialogFooter,
  DialogHeader,
  DialogTitle,
} from "@/components/ui/dialog";
import {
  Select,
  SelectContent,
  SelectItem,
  SelectTrigger,
  SelectValue,
} from "@/components/ui/select";
import { Separator } from "@/components/ui/separator";
import { cn } from "@/lib/utils";
import type { Placement, PlacementStatus } from "@/lib/types/api";

type FilterCondition = "contains" | "not_contains" | "equals";

interface FilterField {
  key: string;
  label: string;
  type: "text" | "number" | "date";
}

interface SortField {
  key: string;
  label: string;
}

interface SortOption {
  field: string;
  direction: "asc" | "desc";
}

interface FiltersModalProps {
  open: boolean;
  onOpenChange: (open: boolean) => void;
  onApply: (filters: PlacementFilters) => void;
  existingPlacements: Placement[];
  initialFilters: PlacementFilters;
}

export interface PlacementFilters {
  channelFilters: {
    name: { value: string; condition: FilterCondition };
    username: { value: string; condition: FilterCondition };
    subscribersMin: number | null;
    subscribersMax: number | null;
  };
  placementFilters: {
    statuses: PlacementStatus[];
    costMin: number | null;
    costMax: number | null;
    dateFrom: string | null;
    dateTo: string | null;
    hasPlacement: boolean | null;
  };
  sort: SortOption | null;
}

const CHANNEL_FILTER_FIELDS: FilterField[] = [
  { key: "name", label: "Название канала", type: "text" },
  { key: "username", label: "Username", type: "text" },
];

const SORT_FIELDS: SortField[] = [
  { key: "title", label: "Название канала" },
  { key: "subscribers", label: "Подписчики" },
  { key: "cost", label: "Стоимость" },
  { key: "date", label: "Дата размещения" },
  { key: "cpm", label: "CPM" },
  { key: "cpf", label: "CPF" },
];

const CONDITION_OPTIONS: { value: FilterCondition; label: string }[] = [
  { value: "contains", label: "содержит" },
  { value: "not_contains", label: "не содержит" },
  { value: "equals", label: "равно" },
];

const STATUS_OPTIONS: PlacementStatus[] = [
  "Без статуса",
  "Написать",
  "Ждём ответа",
  "Согласование условий",
  "Оплатить",
  "Оплачено",
  "Отмена",
  "Не подходит цена",
  "Неактуально",
  "Не отвечает",
];

const CONDITION_LABELS: Record<FilterCondition, string> = {
  contains: "содержит",
  not_contains: "не содержит",
  equals: "равно",
};

export function FiltersModal({
  open,
  onOpenChange,
  onApply,
  existingPlacements,
  initialFilters,
}: FiltersModalProps) {
  const [filters, setFilters] = useState<PlacementFilters>(initialFilters);
  const [activeTab, setActiveTab] = useState<"channels" | "placements" | "sort">("channels");

  const handleApply = () => {
    onApply(filters);
    onOpenChange(false);
  };

  const handleReset = () => {
    const defaultFilters: PlacementFilters = {
      channelFilters: {
        name: { value: "", condition: "contains" },
        username: { value: "", condition: "contains" },
        subscribersMin: null,
        subscribersMax: null,
      },
      placementFilters: {
        statuses: [],
        costMin: null,
        costMax: null,
        dateFrom: null,
        dateTo: null,
        hasPlacement: null,
      },
      sort: null,
    };
    setFilters(defaultFilters);
  };

  const toggleStatus = (status: PlacementStatus) => {
    const currentStatuses = filters.placementFilters.statuses;
    const newStatuses = currentStatuses.includes(status)
      ? currentStatuses.filter((s) => s !== status)
      : [...currentStatuses, status];
    setFilters({
      ...filters,
      placementFilters: { ...filters.placementFilters, statuses: newStatuses },
    });
  };

  const updateChannelFilter = (
    key: "name" | "username",
    updates: { value?: string; condition?: FilterCondition }
  ) => {
    setFilters({
      ...filters,
      channelFilters: {
        ...filters.channelFilters,
        [key]: { ...filters.channelFilters[key], ...updates },
      },
    });
  };

  const hasActiveFilters =
    filters.channelFilters.name.value ||
    filters.channelFilters.username.value ||
    filters.channelFilters.subscribersMin !== null ||
    filters.channelFilters.subscribersMax !== null ||
    filters.placementFilters.statuses.length > 0 ||
    filters.placementFilters.costMin !== null ||
    filters.placementFilters.costMax !== null ||
    filters.placementFilters.dateFrom ||
    filters.placementFilters.dateTo ||
    filters.sort;

  return (
    <Dialog open={open} onOpenChange={onOpenChange}>
      <DialogContent className="max-w-2xl max-h-[80vh] overflow-hidden flex flex-col">
        <DialogHeader>
          <DialogTitle className="flex items-center gap-2">
            <Filter className="h-5 w-5" />
            Фильтры и сортировка
          </DialogTitle>
          <DialogDescription>
            Настройте фильтры для каналов и размещений
          </DialogDescription>
        </DialogHeader>

        <div className="flex border-b">
          <button
            onClick={() => setActiveTab("channels")}
            className={cn(
              "px-4 py-2 text-sm font-medium border-b-2 transition-colors",
              activeTab === "channels"
                ? "border-primary text-primary"
                : "border-transparent text-muted-foreground hover:text-foreground"
            )}
          >
            Каналы
          </button>
          <button
            onClick={() => setActiveTab("placements")}
            className={cn(
              "px-4 py-2 text-sm font-medium border-b-2 transition-colors",
              activeTab === "placements"
                ? "border-primary text-primary"
                : "border-transparent text-muted-foreground hover:text-foreground"
            )}
          >
            Размещения
          </button>
          <button
            onClick={() => setActiveTab("sort")}
            className={cn(
              "px-4 py-2 text-sm font-medium border-b-2 transition-colors flex items-center gap-1",
              activeTab === "sort"
                ? "border-primary text-primary"
                : "border-transparent text-muted-foreground hover:text-foreground"
            )}
          >
            <ArrowUpDown className="h-4 w-4" />
            Сортировка
          </button>
        </div>

        <div className="flex-1 overflow-y-auto p-4">
          {activeTab === "channels" && (
            <div className="space-y-4">
              {CHANNEL_FILTER_FIELDS.map((field) => (
                <div key={field.key} className="space-y-2">
                  <Label className="flex items-center gap-2">
                    {field.label}
                    <Select
                      value={filters.channelFilters[field.key as "name" | "username"].condition}
                      onValueChange={(value: FilterCondition) =>
                        updateChannelFilter(field.key as "name" | "username", { condition: value })
                      }
                    >
                      <SelectTrigger className="h-7 w-36 text-xs">
                        <SelectValue />
                      </SelectTrigger>
                      <SelectContent>
                        {CONDITION_OPTIONS.map((opt) => (
                          <SelectItem key={opt.value} value={opt.value}>
                            {opt.label}
                          </SelectItem>
                        ))}
                      </SelectContent>
                    </Select>
                  </Label>
                  <Input
                    placeholder={
                      filters.channelFilters[field.key as "name" | "username"].condition === "equals"
                        ? "Точное значение"
                        : "Например: новости"
                    }
                    value={filters.channelFilters[field.key as "name" | "username"].value}
                    onChange={(e) =>
                      updateChannelFilter(field.key as "name" | "username", { value: e.target.value })
                    }
                  />
                </div>
              ))}

              <div className="grid grid-cols-2 gap-4">
                <div className="space-y-2">
                  <Label>Мин. подписчиков</Label>
                  <Input
                    type="number"
                    placeholder="0"
                    value={filters.channelFilters.subscribersMin || ""}
                    onChange={(e) =>
                      setFilters({
                        ...filters,
                        channelFilters: {
                          ...filters.channelFilters,
                          subscribersMin: e.target.value ? parseInt(e.target.value) : null,
                        },
                      })
                    }
                  />
                </div>
                <div className="space-y-2">
                  <Label>Макс. подписчиков</Label>
                  <Input
                    type="number"
                    placeholder="1000000"
                    value={filters.channelFilters.subscribersMax || ""}
                    onChange={(e) =>
                      setFilters({
                        ...filters,
                        channelFilters: {
                          ...filters.channelFilters,
                          subscribersMax: e.target.value ? parseInt(e.target.value) : null,
                        },
                      })
                    }
                  />
                </div>
              </div>
            </div>
          )}

          {activeTab === "placements" && (
            <div className="space-y-4">
              <div className="space-y-2">
                <Label>Статусы размещений</Label>
                <div className="flex flex-wrap gap-2 max-h-40 overflow-y-auto">
                  {STATUS_OPTIONS.map((status) => (
                    <label
                      key={status}
                      className={cn(
                        "flex items-center gap-2 px-3 py-1.5 rounded-md border cursor-pointer transition-colors text-sm",
                        filters.placementFilters.statuses.includes(status)
                          ? "bg-primary/10 border-primary text-primary"
                          : "hover:bg-muted"
                      )}
                    >
                      <Checkbox
                        checked={filters.placementFilters.statuses.includes(status)}
                        onCheckedChange={() => toggleStatus(status)}
                      />
                      {status}
                    </label>
                  ))}
                </div>
              </div>

              <div className="grid grid-cols-2 gap-4">
                <div className="space-y-2">
                  <Label>Мин. стоимость (₽)</Label>
                  <Input
                    type="number"
                    placeholder="0"
                    value={filters.placementFilters.costMin || ""}
                    onChange={(e) =>
                      setFilters({
                        ...filters,
                        placementFilters: {
                          ...filters.placementFilters,
                          costMin: e.target.value ? parseFloat(e.target.value) : null,
                        },
                      })
                    }
                  />
                </div>
                <div className="space-y-2">
                  <Label>Макс. стоимость (₽)</Label>
                  <Input
                    type="number"
                    placeholder="100000"
                    value={filters.placementFilters.costMax || ""}
                    onChange={(e) =>
                      setFilters({
                        ...filters,
                        placementFilters: {
                          ...filters.placementFilters,
                          costMax: e.target.value ? parseFloat(e.target.value) : null,
                        },
                      })
                    }
                  />
                </div>
              </div>

              <div className="grid grid-cols-2 gap-4">
                <div className="space-y-2">
                  <Label>Дата размещения от</Label>
                  <Input
                    type="date"
                    value={filters.placementFilters.dateFrom || ""}
                    onChange={(e) =>
                      setFilters({
                        ...filters,
                        placementFilters: {
                          ...filters.placementFilters,
                          dateFrom: e.target.value || null,
                        },
                      })
                    }
                  />
                </div>
                <div className="space-y-2">
                  <Label>Дата размещения до</Label>
                  <Input
                    type="date"
                    value={filters.placementFilters.dateTo || ""}
                    onChange={(e) =>
                      setFilters({
                        ...filters,
                        placementFilters: {
                          ...filters.placementFilters,
                          dateTo: e.target.value || null,
                        },
                      })
                    }
                  />
                </div>
              </div>
            </div>
          )}

          {activeTab === "sort" && (
            <div className="space-y-4">
              <div className="grid grid-cols-3 gap-4">
                <div className="col-span-2 space-y-2">
                  <Label>Сортировать по</Label>
                  <Select
                    value={filters.sort?.field || ""}
                    onValueChange={(field) =>
                      setFilters({
                        ...filters,
                        sort: filters.sort
                          ? { ...filters.sort, field }
                          : { field, direction: "desc" },
                      })
                    }
                  >
                    <SelectTrigger>
                      <SelectValue placeholder="Выберите поле" />
                    </SelectTrigger>
                    <SelectContent>
                      {SORT_FIELDS.map((field) => (
                        <SelectItem key={field.key} value={field.key}>
                          {field.label}
                        </SelectItem>
                      ))}
                    </SelectContent>
                  </Select>
                </div>
                <div className="space-y-2">
                  <Label>Направление</Label>
                  <div className="flex gap-1 p-1 border rounded-md">
                    <button
                      onClick={() =>
                        setFilters({
                          ...filters,
                          sort: filters.sort
                            ? { ...filters.sort, direction: "asc" }
                            : { field: "title", direction: "asc" },
                        })
                      }
                      className={cn(
                        "flex-1 flex items-center justify-center py-2 rounded-sm transition-colors",
                        filters.sort?.direction === "asc"
                          ? "bg-primary text-primary-foreground"
                          : "hover:bg-muted"
                      )}
                      title="По возрастанию"
                    >
                      <ArrowUp className="h-4 w-4" />
                      <span className="ml-1 text-xs">A-Z</span>
                    </button>
                    <button
                      onClick={() =>
                        setFilters({
                          ...filters,
                          sort: filters.sort
                            ? { ...filters.sort, direction: "desc" }
                            : { field: "title", direction: "desc" },
                        })
                      }
                      className={cn(
                        "flex-1 flex items-center justify-center py-2 rounded-sm transition-colors",
                        filters.sort?.direction === "desc"
                          ? "bg-primary text-primary-foreground"
                          : "hover:bg-muted"
                      )}
                      title="По убыванию"
                    >
                      <ArrowDown className="h-4 w-4" />
                      <span className="ml-1 text-xs">Z-A</span>
                    </button>
                  </div>
                </div>
              </div>

              {filters.sort && (
                <div className="flex items-center gap-2 text-sm text-muted-foreground">
                  <span>Текущая сортировка:</span>
                  <span className="font-medium">
                    {SORT_FIELDS.find((f) => f.key === filters.sort?.field)?.label ||
                      filters.sort?.field}
                  </span>
                  <span>
                    {filters.sort.direction === "asc" ? "↑" : "↓"} (
                    {filters.sort.direction === "asc" ? "A-Z" : "Z-A"})
                  </span>
                </div>
              )}
            </div>
          )}
        </div>

        <DialogFooter className="flex justify-between">
          <Button variant="outline" onClick={handleReset}>
            Сбросить
          </Button>
          <div className="flex gap-2">
            <Button variant="outline" onClick={() => onOpenChange(false)}>
              Отмена
            </Button>
            <Button onClick={handleApply}>
              Применить
              {hasActiveFilters && (
                <span className="ml-1 px-1.5 py-0.5 text-xs bg-primary-foreground/20 rounded">
                  ✓
                </span>
              )}
            </Button>
          </div>
        </DialogFooter>
      </DialogContent>
    </Dialog>
  );
}