import Foundation
import UIKit
import Postbox
import TelegramUIPreferences
import TelegramCore

public func makeDefaultPresentationTheme(reference: PresentationBuiltinThemeReference, extendingThemeReference: PresentationThemeReference? = nil, serviceBackgroundColor: UIColor?, preview: Bool = false) -> PresentationTheme {
    let theme: PresentationTheme
    switch reference {
        case .dayClassic:
            theme = makeDefaultDayPresentationTheme(extendingThemeReference: extendingThemeReference, serviceBackgroundColor: serviceBackgroundColor, day: false, preview: preview)
        case .day:
            theme = makeDefaultDayPresentationTheme(extendingThemeReference: extendingThemeReference, serviceBackgroundColor: serviceBackgroundColor, day: true, preview: preview)
        case .night:
            theme = makeDefaultDarkPresentationTheme(extendingThemeReference: extendingThemeReference, preview: preview)
        case .nightAccent:
            theme = makeDefaultDarkTintedPresentationTheme(extendingThemeReference: extendingThemeReference, preview: preview)
    }
    return theme
}

public func customizePresentationTheme(_ theme: PresentationTheme, editing: Bool, title: String? = nil, accentColor: UIColor?, outgoingAccentColor: UIColor?, backgroundColors: [UInt32], bubbleColors: [UInt32], animateBubbleColors: Bool?, wallpaper: TelegramWallpaper? = nil, baseColor: PresentationThemeBaseColor? = nil) -> PresentationTheme {
    if accentColor == nil && bubbleColors.isEmpty && backgroundColors.isEmpty && wallpaper == nil {
        return theme
    }
    switch theme.referenceTheme {
        case .day, .dayClassic:
            return customizeDefaultDayTheme(theme: theme, editing: editing, title: title, accentColor: accentColor, outgoingAccentColor: outgoingAccentColor, backgroundColors: backgroundColors, bubbleColors: bubbleColors, animateBubbleColors: animateBubbleColors ?? false, wallpaper: wallpaper, serviceBackgroundColor: nil)
        case .night:
            return customizeDefaultDarkPresentationTheme(theme: theme, editing: editing, title: title, accentColor: accentColor, backgroundColors: backgroundColors, bubbleColors: bubbleColors, animateBubbleColors: animateBubbleColors ?? false, wallpaper: wallpaper, baseColor: baseColor)
        case .nightAccent:
            return customizeDefaultDarkTintedPresentationTheme(theme: theme, editing: editing, title: title, accentColor: accentColor, backgroundColors: backgroundColors, bubbleColors: bubbleColors, animateBubbleColors: animateBubbleColors ?? false, wallpaper: wallpaper, baseColor: baseColor)
    }
}

public func makePresentationTheme(settings: TelegramThemeSettings, title: String? = nil, serviceBackgroundColor: UIColor? = nil) -> PresentationTheme? {
    let defaultTheme = makeDefaultPresentationTheme(reference: PresentationBuiltinThemeReference(baseTheme: settings.baseTheme), extendingThemeReference: nil, serviceBackgroundColor: serviceBackgroundColor, preview: false)
    return customizePresentationTheme(defaultTheme, editing: true, title: title, accentColor: UIColor(argb: settings.accentColor), outgoingAccentColor: settings.outgoingAccentColor.flatMap { UIColor(argb: $0) }, backgroundColors: [], bubbleColors: settings.messageColors, animateBubbleColors: settings.animateMessageColors, wallpaper: settings.wallpaper)
}

public func makePresentationTheme(cloudTheme: TelegramTheme, dark: Bool = false) -> PresentationTheme? {
    let settings: TelegramThemeSettings?
    if let exactSettings = cloudTheme.settings?.first(where: { dark ? ($0.baseTheme == .night || $0.baseTheme == .tinted) : ($0.baseTheme == .classic || $0.baseTheme == .day) }) {
        settings = exactSettings
    } else if let firstSettings = cloudTheme.settings?.first {
        settings = firstSettings
    } else {
        settings = nil
    }
    guard let settings = settings else {
        return nil
    }
    let defaultTheme = makeDefaultPresentationTheme(reference: PresentationBuiltinThemeReference(baseTheme: settings.baseTheme), extendingThemeReference: .cloud(PresentationCloudTheme(theme: cloudTheme, resolvedWallpaper: nil, creatorAccountId: nil)), serviceBackgroundColor: nil, preview: false)
    return customizePresentationTheme(defaultTheme, editing: true, accentColor: UIColor(argb: settings.accentColor), outgoingAccentColor: settings.outgoingAccentColor.flatMap { UIColor(argb: $0) }, backgroundColors: [], bubbleColors: settings.messageColors, animateBubbleColors: settings.animateMessageColors, wallpaper: settings.wallpaper)
}

public func makePresentationTheme(cloudTheme: TelegramTheme, baseTheme: TelegramBaseTheme? = nil) -> PresentationTheme? {
    let settings: TelegramThemeSettings?
    if let exactSettings = cloudTheme.settings?.first(where: { $0.baseTheme == baseTheme }) {
        settings = exactSettings
    } else if let firstSettings = cloudTheme.settings?.first {
        settings = firstSettings
    } else {
        settings = nil
    }
    guard let settings = settings else {
        return nil
    }
    let defaultTheme = makeDefaultPresentationTheme(reference: PresentationBuiltinThemeReference(baseTheme: settings.baseTheme), extendingThemeReference: nil, serviceBackgroundColor: nil, preview: false)
    return customizePresentationTheme(defaultTheme, editing: true, accentColor: UIColor(argb: settings.accentColor), outgoingAccentColor: settings.outgoingAccentColor.flatMap { UIColor(argb: $0) }, backgroundColors: [], bubbleColors: settings.messageColors, animateBubbleColors: settings.animateMessageColors, wallpaper: settings.wallpaper)
}

public func makePresentationTheme(mediaBox: MediaBox, themeReference: PresentationThemeReference, baseTheme: TelegramBaseTheme? = nil, extendingThemeReference: PresentationThemeReference? = nil, accentColor: UIColor? = nil, outgoingAccentColor: UIColor? = nil, backgroundColors: [UInt32] = [], bubbleColors: [UInt32] = [], animateBubbleColors: Bool? = nil, wallpaper: TelegramWallpaper? = nil, baseColor: PresentationThemeBaseColor? = nil, serviceBackgroundColor: UIColor? = nil, preview: Bool = false) -> PresentationTheme? {
    var accentColor = accentColor
    if accentColor == .clear {
        accentColor = nil
    }
    let theme: PresentationTheme
    switch themeReference {
        case let .builtin(reference):
            let defaultTheme = makeDefaultPresentationTheme(reference: reference, extendingThemeReference: extendingThemeReference, serviceBackgroundColor: serviceBackgroundColor, preview: preview)
            theme = customizePresentationTheme(defaultTheme, editing: true, accentColor: accentColor, outgoingAccentColor: outgoingAccentColor, backgroundColors: backgroundColors, bubbleColors: bubbleColors, animateBubbleColors: animateBubbleColors, wallpaper: wallpaper, baseColor: baseColor)
        case let .local(info):
            if let path = mediaBox.completedResourcePath(info.resource), let data = try? Data(contentsOf: URL(fileURLWithPath: path), options: .mappedRead), let loadedTheme = makePresentationTheme(data: data, themeReference: themeReference, resolvedWallpaper: info.resolvedWallpaper) {
                theme = customizePresentationTheme(loadedTheme, editing: false, accentColor: accentColor, outgoingAccentColor: outgoingAccentColor, backgroundColors: backgroundColors, bubbleColors: bubbleColors, animateBubbleColors: animateBubbleColors, wallpaper: wallpaper)
            } else {
                return nil
            }
        case let .cloud(info):
            let settings: TelegramThemeSettings?
            if let exactSettings = info.theme.settings?.first(where: { $0.baseTheme == baseTheme }) {
                settings = exactSettings
            } else if let firstSettings = info.theme.settings?.first {
                settings = firstSettings
            } else {
                settings = nil
            }
            if let settings = settings {
                if let loadedTheme = makePresentationTheme(mediaBox: mediaBox, themeReference: .builtin(PresentationBuiltinThemeReference(baseTheme: settings.baseTheme)), extendingThemeReference: themeReference, accentColor: accentColor ?? UIColor(argb: settings.accentColor), outgoingAccentColor: outgoingAccentColor ?? settings.outgoingAccentColor.flatMap { UIColor(argb: $0) }, backgroundColors: [], bubbleColors: bubbleColors.isEmpty ? settings.messageColors : bubbleColors, animateBubbleColors: animateBubbleColors ?? settings.animateMessageColors, wallpaper: wallpaper ?? settings.wallpaper, serviceBackgroundColor: serviceBackgroundColor, preview: preview) {
                    theme = loadedTheme
                } else {
                    return nil
                }
            } else if let file = info.theme.file, let path = mediaBox.completedResourcePath(file.resource), let data = try? Data(contentsOf: URL(fileURLWithPath: path), options: .mappedRead), let loadedTheme = makePresentationTheme(data: data, themeReference: themeReference, resolvedWallpaper: info.resolvedWallpaper) {
                theme = customizePresentationTheme(loadedTheme, editing: false, accentColor: accentColor, outgoingAccentColor: outgoingAccentColor, backgroundColors: backgroundColors, bubbleColors: bubbleColors, animateBubbleColors: animateBubbleColors, wallpaper: wallpaper)
            } else {
                return nil
            }
    }
    return theme
}