//
//  Preferences.swift
//  Tusker
//
//  Created by Shadowfacts on 8/28/18.
//  Copyright © 2018 Shadowfacts. All rights reserved.
//

import UIKit
import Pachyderm
import Combine

class Preferences: Codable, ObservableObject {

    static var shared: Preferences = load()
    
    private static var documentsDirectory = FileManager.default.urls(for: .documentDirectory, in: .userDomainMask).first!
    private static var archiveURL = Preferences.documentsDirectory.appendingPathComponent("preferences").appendingPathExtension("plist")
    
    static func save() {
        let encoder = PropertyListEncoder()
        let data = try? encoder.encode(shared)
        try? data?.write(to: archiveURL, options: .noFileProtection)
    }
    
    static func load() -> Preferences {
        let decoder = PropertyListDecoder()
        if let data = try? Data(contentsOf: archiveURL),
            let preferences = try? decoder.decode(Preferences.self, from: data) {
            return preferences
        }
        return Preferences()
    }
    
    private init() {}
    
    required init(from decoder: Decoder) throws {
        let container = try decoder.container(keyedBy: CodingKeys.self)
        
        self.theme = try container.decode(UIUserInterfaceStyle.self, forKey: .theme)
        self.pureBlackDarkMode = try container.decodeIfPresent(Bool.self, forKey: .pureBlackDarkMode) ?? true
        self.accentColor = try container.decodeIfPresent(AccentColor.self, forKey: .accentColor) ?? .default
        self.avatarStyle = try container.decode(AvatarStyle.self, forKey: .avatarStyle)
        self.hideCustomEmojiInUsernames = try container.decode(Bool.self, forKey: .hideCustomEmojiInUsernames)
        self.showIsStatusReplyIcon = try container.decode(Bool.self, forKey: .showIsStatusReplyIcon)
        self.alwaysShowStatusVisibilityIcon = try container.decode(Bool.self, forKey: .alwaysShowStatusVisibilityIcon)
        self.hideActionsInTimeline = try container.decodeIfPresent(Bool.self, forKey: .hideActionsInTimeline) ?? false
        self.showLinkPreviews = try container.decodeIfPresent(Bool.self, forKey: .showLinkPreviews) ?? true
        self.leadingStatusSwipeActions = try container.decodeIfPresent([StatusSwipeAction].self, forKey: .leadingStatusSwipeActions) ?? leadingStatusSwipeActions
        self.trailingStatusSwipeActions = try container.decodeIfPresent([StatusSwipeAction].self, forKey: .trailingStatusSwipeActions) ?? trailingStatusSwipeActions
        
        self.defaultPostVisibility = try container.decode(Status.Visibility.self, forKey: .defaultPostVisibility)
        self.defaultReplyVisibility = try container.decodeIfPresent(ReplyVisibility.self, forKey: .defaultReplyVisibility) ?? .sameAsPost
        self.automaticallySaveDrafts = try container.decode(Bool.self, forKey: .automaticallySaveDrafts)
        self.requireAttachmentDescriptions = try container.decode(Bool.self, forKey: .requireAttachmentDescriptions)
        self.contentWarningCopyMode = try container.decode(ContentWarningCopyMode.self, forKey: .contentWarningCopyMode)
        self.mentionReblogger = try container.decode(Bool.self, forKey: .mentionReblogger)
        self.useTwitterKeyboard = try container.decodeIfPresent(Bool.self, forKey: .useTwitterKeyboard) ?? false
        
        if let blurAllMedia = try? container.decodeIfPresent(Bool.self, forKey: .blurAllMedia) {
            self.attachmentBlurMode = blurAllMedia ? .always : .useStatusSetting
        } else {
            self.attachmentBlurMode = try container.decode(AttachmentBlurMode.self, forKey: .attachmentBlurMode)
        }
        self.blurMediaBehindContentWarning = try container.decodeIfPresent(Bool.self, forKey: .blurMediaBehindContentWarning) ?? true
        self.automaticallyPlayGifs = try container.decode(Bool.self, forKey: .automaticallyPlayGifs)
        self.showUncroppedMediaInline = try container.decodeIfPresent(Bool.self, forKey: .showUncroppedMediaInline) ?? true
        self.showAttachmentBadges = try container.decodeIfPresent(Bool.self, forKey: .showAttachmentBadges) ?? true
        
        self.openLinksInApps = try container.decode(Bool.self, forKey: .openLinksInApps)
        self.useInAppSafari = try container.decode(Bool.self, forKey: .useInAppSafari)
        self.inAppSafariAutomaticReaderMode = try container.decode(Bool.self, forKey: .inAppSafariAutomaticReaderMode)
        self.expandAllContentWarnings = try container.decodeIfPresent(Bool.self, forKey: .expandAllContentWarnings) ?? false
        self.collapseLongPosts = try container.decodeIfPresent(Bool.self, forKey: .collapseLongPosts) ?? true
        self.oppositeCollapseKeywords = try container.decodeIfPresent([String].self, forKey: .oppositeCollapseKeywords) ?? []
        self.confirmBeforeReblog = try container.decodeIfPresent(Bool.self, forKey: .confirmBeforeReblog) ?? false
        self.timelineStateRestoration = try container.decodeIfPresent(Bool.self, forKey: .timelineStateRestoration) ?? true
        self.timelineSyncMode = try container.decodeIfPresent(TimelineSyncMode.self, forKey: .timelineSyncMode) ?? .icloud
        self.hideReblogsInTimelines = try container.decodeIfPresent(Bool.self, forKey: .hideReblogsInTimelines) ?? false
        self.hideRepliesInTimelines = try container.decodeIfPresent(Bool.self, forKey: .hideRepliesInTimelines) ?? false
        
        self.showFavoriteAndReblogCounts = try container.decode(Bool.self, forKey: .showFavoriteAndReblogCounts)
        self.defaultNotificationsMode = try container.decode(NotificationsMode.self, forKey: .defaultNotificationsType)
        self.grayscaleImages = try container.decodeIfPresent(Bool.self, forKey: .grayscaleImages) ?? false
        self.disableInfiniteScrolling = try container.decodeIfPresent(Bool.self, forKey: .disableInfiniteScrolling) ?? false
        self.hideTrends = try container.decodeIfPresent(Bool.self, forKey: .hideTrends) ?? false
        
        self.statusContentType = try container.decode(StatusContentType.self, forKey: .statusContentType)
        
        self.hasShownLocalTimelineDescription = try container.decodeIfPresent(Bool.self, forKey: .hasShownLocalTimelineDescription) ?? false
        self.hasShownFederatedTimelineDescription = try container.decodeIfPresent(Bool.self, forKey: .hasShownFederatedTimelineDescription) ?? false
    }
    
    func encode(to encoder: Encoder) throws {
        var container = encoder.container(keyedBy: CodingKeys.self)
        
        try container.encode(theme, forKey: .theme)
        try container.encode(pureBlackDarkMode, forKey: .pureBlackDarkMode)
        try container.encode(accentColor, forKey: .accentColor)
        try container.encode(avatarStyle, forKey: .avatarStyle)
        try container.encode(hideCustomEmojiInUsernames, forKey: .hideCustomEmojiInUsernames)
        try container.encode(showIsStatusReplyIcon, forKey: .showIsStatusReplyIcon)
        try container.encode(alwaysShowStatusVisibilityIcon, forKey: .alwaysShowStatusVisibilityIcon)
        try container.encode(hideActionsInTimeline, forKey: .hideActionsInTimeline)
        try container.encode(showLinkPreviews, forKey: .showLinkPreviews)
        try container.encode(leadingStatusSwipeActions, forKey: .leadingStatusSwipeActions)
        try container.encode(trailingStatusSwipeActions, forKey: .trailingStatusSwipeActions)
        
        try container.encode(defaultPostVisibility, forKey: .defaultPostVisibility)
        try container.encode(defaultReplyVisibility, forKey: .defaultReplyVisibility)
        try container.encode(automaticallySaveDrafts, forKey: .automaticallySaveDrafts)
        try container.encode(requireAttachmentDescriptions, forKey: .requireAttachmentDescriptions)
        try container.encode(contentWarningCopyMode, forKey: .contentWarningCopyMode)
        try container.encode(mentionReblogger, forKey: .mentionReblogger)
        try container.encode(useTwitterKeyboard, forKey: .useTwitterKeyboard)
        
        try container.encode(attachmentBlurMode, forKey: .attachmentBlurMode)
        try container.encode(blurMediaBehindContentWarning, forKey: .blurMediaBehindContentWarning)
        try container.encode(automaticallyPlayGifs, forKey: .automaticallyPlayGifs)
        try container.encode(showUncroppedMediaInline, forKey: .showUncroppedMediaInline)
        try container.encode(showAttachmentBadges, forKey: .showAttachmentBadges)
        
        try container.encode(openLinksInApps, forKey: .openLinksInApps)
        try container.encode(useInAppSafari, forKey: .useInAppSafari)
        try container.encode(inAppSafariAutomaticReaderMode, forKey: .inAppSafariAutomaticReaderMode)
        try container.encode(expandAllContentWarnings, forKey: .expandAllContentWarnings)
        try container.encode(collapseLongPosts, forKey: .collapseLongPosts)
        try container.encode(oppositeCollapseKeywords, forKey: .oppositeCollapseKeywords)
        try container.encode(confirmBeforeReblog, forKey: .confirmBeforeReblog)
        try container.encode(timelineStateRestoration, forKey: .timelineStateRestoration)
        try container.encode(timelineSyncMode, forKey: .timelineSyncMode)
        try container.encode(hideReblogsInTimelines, forKey: .hideReblogsInTimelines)
        try container.encode(hideRepliesInTimelines, forKey: .hideRepliesInTimelines)
        
        try container.encode(showFavoriteAndReblogCounts, forKey: .showFavoriteAndReblogCounts)
        try container.encode(defaultNotificationsMode, forKey: .defaultNotificationsType)
        try container.encode(grayscaleImages, forKey: .grayscaleImages)
        try container.encode(disableInfiniteScrolling, forKey: .disableInfiniteScrolling)
        try container.encode(hideTrends, forKey: .hideTrends)
        
        try container.encode(statusContentType, forKey: .statusContentType)
        
        try container.encode(hasShownLocalTimelineDescription, forKey: .hasShownLocalTimelineDescription)
        try container.encode(hasShownFederatedTimelineDescription, forKey: .hasShownFederatedTimelineDescription)
    }
    
    // MARK: Appearance
    @Published var theme = UIUserInterfaceStyle.unspecified
    @Published var pureBlackDarkMode = true
    @Published var accentColor = AccentColor.default
    @Published var avatarStyle = AvatarStyle.roundRect
    @Published var hideCustomEmojiInUsernames = false
    @Published var showIsStatusReplyIcon = false
    @Published var alwaysShowStatusVisibilityIcon = false
    @Published var hideActionsInTimeline = false
    @Published var showLinkPreviews = true
    @Published var leadingStatusSwipeActions: [StatusSwipeAction] = [.favorite, .reblog]
    @Published var trailingStatusSwipeActions: [StatusSwipeAction] = [.reply, .share]
    
    // MARK: Composing
    @Published var defaultPostVisibility = Status.Visibility.public
    @Published var defaultReplyVisibility = ReplyVisibility.sameAsPost
    @Published var automaticallySaveDrafts = true
    @Published var requireAttachmentDescriptions = false
    @Published var contentWarningCopyMode = ContentWarningCopyMode.asIs
    @Published var mentionReblogger = false
    @Published var useTwitterKeyboard = false
    
    // MARK: Media
    @Published var attachmentBlurMode = AttachmentBlurMode.useStatusSetting {
        didSet {
            if attachmentBlurMode == .always {
                blurMediaBehindContentWarning = true
            } else if attachmentBlurMode == .never {
                blurMediaBehindContentWarning = false
            }
        }
    }
    @Published var blurMediaBehindContentWarning = true
    @Published var automaticallyPlayGifs = true
    @Published var showUncroppedMediaInline = true
    @Published var showAttachmentBadges = true
    
    // MARK: Behavior
    @Published var openLinksInApps = true
    @Published var useInAppSafari = true
    @Published var inAppSafariAutomaticReaderMode = false
    @Published var expandAllContentWarnings = false
    @Published var collapseLongPosts = true
    @Published var oppositeCollapseKeywords: [String] = []
    @Published var confirmBeforeReblog = false
    @Published var timelineStateRestoration = true
    @Published var timelineSyncMode = TimelineSyncMode.icloud
    @Published var hideReblogsInTimelines = false
    @Published var hideRepliesInTimelines = false
    
    // MARK: Digital Wellness
    @Published var showFavoriteAndReblogCounts = true
    @Published var defaultNotificationsMode = NotificationsMode.allNotifications
    @Published var grayscaleImages = false
    @Published var disableInfiniteScrolling = false
    @Published var hideTrends = false
    
    // MARK: Advanced
    @Published var statusContentType: StatusContentType = .plain
    @Published var reportErrorsAutomatically = true
    
    // MARK:
    @Published var hasShownLocalTimelineDescription = false
    @Published var hasShownFederatedTimelineDescription = false
    
    private enum CodingKeys: String, CodingKey {
        case theme
        case pureBlackDarkMode
        case accentColor
        case avatarStyle
        case hideCustomEmojiInUsernames
        case showIsStatusReplyIcon
        case alwaysShowStatusVisibilityIcon
        case hideActionsInTimeline
        case showLinkPreviews
        case leadingStatusSwipeActions
        case trailingStatusSwipeActions
        
        case defaultPostVisibility
        case defaultReplyVisibility
        case automaticallySaveDrafts
        case requireAttachmentDescriptions
        case contentWarningCopyMode
        case mentionReblogger
        case useTwitterKeyboard
        
        case blurAllMedia // only used for migration
        case attachmentBlurMode
        case blurMediaBehindContentWarning
        case automaticallyPlayGifs
        case showUncroppedMediaInline
        case showAttachmentBadges
        
        case openLinksInApps
        case useInAppSafari
        case inAppSafariAutomaticReaderMode
        case expandAllContentWarnings
        case collapseLongPosts
        case oppositeCollapseKeywords
        case confirmBeforeReblog
        case timelineStateRestoration
        case timelineSyncMode
        case hideReblogsInTimelines
        case hideRepliesInTimelines
        
        case showFavoriteAndReblogCounts
        case defaultNotificationsType
        case grayscaleImages
        case disableInfiniteScrolling
        case hideTrends = "hideDiscover"
        
        case statusContentType
        
        case hasShownLocalTimelineDescription
        case hasShownFederatedTimelineDescription
    }
    
}

extension Preferences {
    enum ReplyVisibility: Codable, Hashable, CaseIterable {
        case sameAsPost
        case visibility(Status.Visibility)
        
        static var allCases: [Preferences.ReplyVisibility] = [.sameAsPost] + Status.Visibility.allCases.map { .visibility($0) }
        
        var resolved: Status.Visibility {
            switch self {
            case .sameAsPost:
                return Preferences.shared.defaultPostVisibility
            case .visibility(let vis):
                return vis
            }
        }
        
        var displayName: String {
            switch self {
            case .sameAsPost:
                return "Same as Default"
            case .visibility(let vis):
                return vis.displayName
            }
        }
        
        var imageName: String? {
            switch self {
            case .sameAsPost:
                return nil
            case .visibility(let vis):
                return vis.imageName
            }
        }
    }
}

extension Preferences {
    enum AttachmentBlurMode: Codable, Hashable, CaseIterable {
        case useStatusSetting
        case always
        case never
        
        var displayName: String {
            switch self {
            case .useStatusSetting:
                return "Default"
            case .always:
                return "Always"
            case .never:
                return "Never"
            }
        }
    }
}

extension UIUserInterfaceStyle: Codable {}

extension Preferences {
    enum AccentColor: String, Codable, CaseIterable {
        case `default`
        case purple
        case indigo
        case blue
        case cyan
        case teal
        case mint
        case green
//        case yellow
        case orange
        case red
        case pink
//        case brown
        
        var color: UIColor? {
            switch self {
            case .default:
                return nil
            case .blue:
                return .systemBlue
//            case .brown:
//                return .systemBrown
            case .cyan:
                return .systemCyan
            case .green:
                return .systemGreen
            case .indigo:
                return .systemIndigo
            case .mint:
                return .systemMint
            case .orange:
                return .systemOrange
            case .pink:
                return .systemPink
            case .purple:
                return .systemPurple
            case .red:
                return .systemRed
            case .teal:
                return .systemTeal
//            case .yellow:
//                return .systemYellow
            }
        }
        
        var name: String {
            switch self {
            case .default:
                return "Default"
            case .blue:
                return "Blue"
//            case .brown:
//                return "Brown"
            case .cyan:
                return "Cyan"
            case .green:
                return "Green"
            case .indigo:
                return "Indigo"
            case .mint:
                return "Mint"
            case .orange:
                return "Orange"
            case .pink:
                return "Pink"
            case .purple:
                return "Purple"
            case .red:
                return "Red"
            case .teal:
                return "Teal"
//            case .yellow:
//                return "Yellow"
            }
        }
    }
}

extension Preferences {
    enum TimelineSyncMode: String, Codable {
        case mastodon
        case icloud
    }
}