//
//  IssueViewFilesSectionController.swift
//  Freetime
//
//  Created by Ryan Nystrom on 8/11/17.
//  Copyright © 2017 Ryan Nystrom. All rights reserved.
//

import Foundation
import IGListKit

final class IssueViewFilesSectionController: ListGenericSectionController<IssueFileChangesModel> {

    private let issueModel: IssueDetailsModel
    private let client: GithubClient

    init(issueModel: IssueDetailsModel, client: GithubClient) {
        self.issueModel = issueModel
        self.client = client
        super.init()
        let spacing = Styles.Sizes.rowSpacing / 2
        inset = UIEdgeInsets(top: spacing, left: 0, bottom: spacing, right: 0)
    }

    override func sizeForItem(at index: Int) -> CGSize {
        guard let width = collectionContext?.insetContainerSize.width else { fatalError("Collection context must be set") }
        return CGSize(
            width: width,
            height: Styles.Text.secondary.preferredFont.lineHeight
        )
    }

    override func cellForItem(at index: Int) -> UICollectionViewCell {
        guard let cell = collectionContext?.dequeueReusableCell(of: IssueViewFilesCell.self, for: self, at: index) as? IssueViewFilesCell,
            let object = self.object
            else { fatalError("Missing collection context") }
        cell.configure(changes: object.changes)
        return cell
    }

    override func didSelectItem(at index: Int) {
        guard let object = self.object else { return }

        collectionContext?.deselectItem(at: index, sectionController: self, animated: trueUnlessReduceMotionEnabled)

        let controller = IssueFilesViewController(model: issueModel, client: client, fileCount: object.changes.changedFiles)
        viewController?.show(controller, sender: nil)
    }

}
