//
//  ShareViewDelegate.swift
//  Share Extension
//
//  Created by David Sinclair on 2021-07-18.
//  Copyright © 2021 NewsBlur. All rights reserved.
//

import UIKit

class ShareViewDelegate: NSObject {
    @IBOutlet weak var viewController: ShareViewController!
}

extension ShareViewDelegate: UITableViewDelegate {
    func tableView(_ tableView: UITableView, didSelectRowAt indexPath: IndexPath) {
        if viewController.mode == .add, indexPath.section == 0 {
            viewController.selectedFolderIndexPath = indexPath
            tableView.reloadData()
        }
        
        viewController.updateSaveButtonState()
    }
    
    func tableView(_ tableView: UITableView, didDeselectRowAt indexPath: IndexPath) {
        viewController.updateSaveButtonState()
    }
}

extension ShareViewDelegate: UITableViewDataSource {
    func numberOfSections(in tableView: UITableView) -> Int {
        if viewController.mode == .add {
            return 2
        } else {
            return 1
        }
    }
    
    func tableView(_ tableView: UITableView, titleForHeaderInSection section: Int) -> String? {
        if viewController.mode == .add, section == 1 {
            return "Add new sub-folder:"
        } else {
            return nil
        }
    }
    
    func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
        switch viewController.mode {
        case .save:
            return viewController.tags.count + 1
        case .share:
            return 1
        case .add:
            if section == 0 {
                return viewController.folders.count
            } else {
                return 1
            }
        }
    }
    
    func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
        if viewController.mode == .save {
            if indexPath.item < viewController.tags.count {
                guard let cell = tableView.dequeueReusableCell(withIdentifier: ShareSaveTagCell.reuseIdentifier, for: indexPath) as? ShareSaveTagCell else {
                    preconditionFailure("Expected to dequeue a ShareSaveTagCell")
                }
                
                cell.tagLabel.text = viewController.tags[indexPath.item].name
                
                return cell
            } else {
                guard let cell = tableView.dequeueReusableCell(withIdentifier: ShareSaveNewCell.reuseIdentifier, for: indexPath) as? ShareSaveNewCell else {
                    preconditionFailure("Expected to dequeue a ShareSaveNewCell")
                }
                
                cell.tagField.text = ""
                cell.tagField.placeholder = "new tag"
                
                return cell
            }
        } else if viewController.mode == .add {
            if indexPath.section == 0 {
                guard let cell = tableView.dequeueReusableCell(withIdentifier: ShareSaveTagCell.reuseIdentifier, for: indexPath) as? ShareSaveTagCell else {
                    preconditionFailure("Expected to dequeue a ShareSaveTagCell")
                }
                
                let components = viewController.folders[indexPath.item].components(separatedBy: " ▸ ")
                
                if components.first == "everything" {
                    cell.tagLabel.text = "🗃 Top Level"
                } else {
                    cell.tagLabel.text = "\(String(repeating: "      ", count: components.count))📁 \(components.last ?? "?")"
                }
                
                cell.accessoryType = indexPath == viewController.selectedFolderIndexPath ? .checkmark : .none
                
                return cell
            } else {
                guard let cell = tableView.dequeueReusableCell(withIdentifier: ShareSaveNewCell.reuseIdentifier, for: indexPath) as? ShareSaveNewCell else {
                    preconditionFailure("Expected to dequeue a ShareSaveNewCell")
                }
                
                cell.tagField.text = viewController.newFolder
                cell.tagField.placeholder = "new folder title"
                
                return cell
            }
        } else {
            guard let cell = tableView.dequeueReusableCell(withIdentifier: ShareCommentCell.reuseIdentifier, for: indexPath) as? ShareCommentCell else {
                preconditionFailure("Expected to dequeue a ShareCommentCell")
            }
            
            cell.commentTextView.text = ""
            cell.commentTextView.delegate = self
            
            DispatchQueue.main.async {
                cell.commentTextView.becomeFirstResponder()
            }
            
            return cell
        }
    }
}

extension ShareViewDelegate: UITextViewDelegate {
    func textViewDidChange(_ textView: UITextView) {
        viewController.comments = textView.text
    }
}