//
//  LibraryDetailView.swift
//  Jel
//
//  Created by zerocool on 12/22/23.
//

import SwiftUI
import JellyfinKit

struct LibraryDetailView: View {
  @EnvironmentObject var jellyfinClient: JellyfinClientController
  @StateObject var authState: AuthStateController = AuthStateController.shared
  
  @State var library: BaseItemDto
  @State var items: [BaseItemDto]? = []
  var filter: (_ items: [BaseItemDto]) -> [BaseItemDto]
  
  
  @State var loading: Bool = true
  
  
  @State var searchText: String = ""
  @State var searchResultHints: SearchHintResult?
  @State var searchResultItems: [BaseItemDto]?
  let columns = [
    GridItem(.adaptive(minimum: 150))
  ]
  var body: some View {
    if loading {
      ProgressView()
        .progressViewStyle(.circular)
    } else {
      EmptyView()
    }
    ScrollView {
      LazyVGrid(columns: columns) {
        // uses searchResultItems only if searchText is not empty
        ForEach(!searchText.isEmpty ? (searchResultItems ?? items) ?? [] : items ?? []) {item in
          NavigationLink {
            ItemView(item: item)
          } label: {
            ItemIconView(item: item, imageType: "Primary", width: 150)
              .showCaption()
              .setAspectRatio(item.primaryImageAspectRatio ?? 0.6)
              .padding()
            
          }
          .buttonStyle(PlainButtonStyle())
        }
      }
    }
    .if(!loading) {view in
      view.searchable(text: $searchText)
        .onChange(of: searchText) {
          Task {
            let parameters = Paths.GetParameters(
              userID: AuthStateController.shared.userId,
              searchTerm: searchText.lowercased(),
              parentID: library.id
            )
            searchResultHints = await jellyfinClient.search(parameters: parameters)
            
            searchResultItems = items?.filter { item in
              for hint in searchResultHints?.searchHints ?? [] {
                if hint.name == item.name {
                  return true
                }
              }
              return false
            }
          }
        }
    }
    .onAppear {
      if items?.count ?? 0 > 0 {
        items = self.filter(items ?? [])
        items?.sort(by: {$0.name?.lowercased() ?? "" < $1.name?.lowercased() ?? ""})
        loading = false
        return
      }
      
      Task {
        let params = Paths.GetItemsParameters(
          userID: authState.userId,
          parentID: library.id,
          fields: [.primaryImageAspectRatio,
                   .genres,
                   .taglines,
                   .overview,
                   .parentID,
                   .people]
        )
        let request = Paths.getItems(parameters: params)
        
        do {
          let res = try await jellyfinClient.send(request)
          items = res.value.items
          items = self.filter(items ?? [])
          items?.sort(by: {$0.name?.lowercased() ?? "" < $1.name?.lowercased() ?? ""})
          loading = false
        } catch {
        }
      }
    }
  }
}

//#Preview {
//  LibraryDetailView(library: BaseItemDto())
//}