//
//  ItemPage.swift
//  Luminate
//
//  Created by Brendan Szymanski on 6/16/25.
//
//  Copyright 2026 Brendan Szymanski <hello@bscubed.dev>
//
//  This program is free software: you can redistribute it and/or modify
//  it under the terms of the GNU General Public License as published by
//  the Free Software Foundation, either version 3 of the License, or
//  (at your option) any later version.
//
//  This program is distributed in the hope that it will be useful,
//  but WITHOUT ANY WARRANTY; without even the implied warranty of
//  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
//  GNU General Public License for more details.
//
//  You should have received a copy of the GNU General Public License
//  along with this program.  If not, see <https://www.gnu.org/licenses/>.
//
//  SPDX-License-Identifier: GPL-3.0-or-later
//

import Adwaita
import LuminateCore
import LuminateDI
import LuminateUI

public struct ItemPage: View {

    private var title: String?
    private var parentId: String?
    private var type: DisplayType

    @Binding var navigation: NavigationStack<Page>

    @State private var items: [BaseItemDto] = []
    @State private var isLoading = false

    @Injected(\.client) var client
    @Injected(\.userId) var userId

    nonisolated public init(
        title: String, items: [BaseItemDto],
        type: DisplayType = .mixed,
        navigation: Binding<NavigationStack<Page>>
    ) {
        self.title = title
        self._items = .init(wrappedValue: items)
        self.parentId = nil
        self.type = type
        _navigation = navigation
    }

    nonisolated public init(
        item: BaseItemDto,
        type: DisplayType = .mixed,
        navigation: Binding<NavigationStack<Page>>
    ) {
        self.title = item.name
        self.parentId = item.id
        self.type = type
        _isLoading = .init(wrappedValue: item.id != nil)
        _navigation = navigation
    }

    public var view: Body {
        ScrollView {
            Clamp()
                .maximumSize(1550)
                .tighteningThreshold(550)
                .child {
                    if isLoading, parentId != nil {
                        Spinner()
                    } else {
                        ItemGrid(
                            items: items,
                            type: type,
                            navigation: $navigation,
                            title: title
                        )
                        .padding(32, .vertical)
                    }
                }
        }
        .hscrollbarPolicy(.never)
        .propagateNaturalHeight()
        .onAppear {
            loadIfNeeded()
        }
    }

    private func loadIfNeeded() {
        guard let parentId else { return }
        Task {
            let result = try? await client.getItems(
                userId: userId,
                parentId: parentId,
                fields: [.primaryImageAspectRatio],
                sortBy: [.sortName],
                sortOrder: [.ascending]
            )
            items = result?.items ?? []
            isLoading = false
        }
    }
}