//
// Copyright 2026 Novaloop AG
//
// SPDX-License-Identifier: AGPL-3.0-only OR LicenseRef-Element-Commercial.
// Please see LICENSE files in the repository root for full details.
//

import Foundation

enum HealthChatProfileEditScreenViewModelAction {
    case dismiss
    case displayCameraPicker
    case displayMediaPicker
    case displayFilePicker
}

struct HealthChatProfileEditScreenViewState: BindableState {
    var initialProfile: HealthChatMember?
    var loadFailed = false
    
    var canEditAvatar = false
    var selectedAvatarURL: URL?
    var localMedia: MediaInfo?
    
    var bindings = HealthChatProfileEditScreenViewStateBindings()
    
    var avatarDidChange: Bool {
        localMedia != nil || selectedAvatarURL != initialProfile?.avatarURL
    }
    
    /// The changed text fields as a partial update, nil when nothing changed.
    var fieldsUpdate: HealthChatProfileUpdate? {
        guard let initialProfile else { return nil }
        
        var update = HealthChatProfileUpdate()
        // nil leaves a field unchanged server-side, an empty string clears it.
        func diff(_ binding: String, _ initialValue: String?) -> String? {
            let value = binding.trimmingCharacters(in: .whitespacesAndNewlines)
            return value == (initialValue ?? "") ? nil : value
        }
        
        update.title = diff(bindings.title, initialProfile.title)
        update.firstName = diff(bindings.firstName, initialProfile.firstName)
        update.lastName = diff(bindings.lastName, initialProfile.lastName)
        update.specialty = diff(bindings.specialty, initialProfile.specialty)
        update.practiceName = diff(bindings.practiceName, initialProfile.practiceName)
        update.businessCity = diff(bindings.businessCity, initialProfile.businessCity)
        update.businessEmail = diff(bindings.businessEmail, initialProfile.businessEmail)
        update.businessTel = diff(bindings.businessTel, initialProfile.businessTel)
        update.furtherInfo = diff(bindings.furtherInfo, initialProfile.furtherInfo)
        update.street = diff(bindings.street, initialProfile.street)
        update.houseNumber = diff(bindings.houseNumber, initialProfile.houseNumber)
        update.postalCode = diff(bindings.postalCode, initialProfile.postalCode)
        update.website = diff(bindings.website, initialProfile.website)
        
        return update == HealthChatProfileUpdate() ? nil : update
    }
    
    /// First name, last name, speciality, practice and city are required (web client parity).
    var requiredFieldsAreValid: Bool {
        let requiredFields = [bindings.firstName, bindings.lastName, bindings.specialty,
                              bindings.practiceName, bindings.businessCity]
        guard requiredFields.allSatisfy({ !$0.trimmingCharacters(in: .whitespacesAndNewlines).isEmpty }) else {
            return false
        }
        
        let website = bindings.website.trimmingCharacters(in: .whitespacesAndNewlines)
        return website.isEmpty || URL(string: website) != nil
    }
    
    var canSave: Bool {
        initialProfile != nil && requiredFieldsAreValid && (avatarDidChange || fieldsUpdate != nil)
    }
    
    var showDeleteImageAction: Bool {
        localMedia != nil || selectedAvatarURL != nil
    }
}

struct HealthChatProfileEditScreenViewStateBindings {
    var title = ""
    var firstName = ""
    var lastName = ""
    var specialty = ""
    var practiceName = ""
    var businessCity = ""
    var businessEmail = ""
    var businessTel = ""
    var furtherInfo = ""
    var street = ""
    var houseNumber = ""
    var postalCode = ""
    var website = ""
    
    var showMediaSheet = false
    
    var alertInfo: AlertInfo<HealthChatProfileEditScreenAlertType>?
}

enum HealthChatProfileEditScreenAlertType {
    case failedProcessingMedia
    case unsavedChanges
    case saveError
    case unknown
}

enum HealthChatProfileEditScreenViewAction {
    case cancel
    case save
    case retry
    case presentMediaSource
    case displayCameraPicker
    case displayMediaPicker
    case displayFilePicker
    case removeImage
}