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

import Foundation

/// A user's profile including the HealthChat extended profile fields (MSC4133),
/// as returned by `GET /_matrix/client/v3/profile/{userId}`.
nonisolated struct ExtendedProfile: Equatable {
    let displayName: String?
    let avatarURL: URL?
    let title: String?
    let firstName: String?
    let lastName: String?
    let specialty: String?
    let practiceName: String?
    let furtherInfo: String?
    let businessEmail: String?
    let businessTel: String?
    let street: String?
    let houseNumber: String?
    let postalCode: String?
    let city: String?
    let website: String?
    
    /// Whether any of the HealthChat-specific fields carry a value.
    var hasContent: Bool {
        [title, firstName, lastName, specialty, practiceName, furtherInfo,
         businessEmail, businessTel, street, houseNumber, postalCode, city, website]
            .contains { $0 != nil }
    }
    
    /// The postal address in the same "street nr, plz city" format the web client uses.
    var formattedAddress: String? {
        let streetLine = [street, houseNumber].compactMap { $0 }.joined(separator: " ")
        let cityLine = [postalCode, city].compactMap { $0 }.joined(separator: " ")
        let lines = [streetLine, cityLine].filter { !$0.isEmpty }
        return lines.isEmpty ? nil : lines.joined(separator: ", ")
    }
}

extension ExtendedProfile: Decodable {
    private struct StringKey: CodingKey {
        let stringValue: String
        var intValue: Int? {
            nil
        }
        
        init(stringValue: String) {
            self.stringValue = stringValue
        }
        
        init?(intValue: Int) {
            nil
        }
    }
    
    init(from decoder: Decoder) throws {
        let container = try decoder.container(keyedBy: StringKey.self)
        
        // Presence of the canonical key suppresses the legacy key even when its value is
        // empty, so a field the user cleared isn't resurrected by stale legacy data.
        // Empty and non-string values read as nil.
        func value(_ canonicalKey: String, legacyKey: String? = nil) -> String? {
            for key in [canonicalKey, legacyKey].compactMap({ $0 }) {
                guard container.contains(StringKey(stringValue: key)) else { continue }
                let raw = try? container.decode(String.self, forKey: .init(stringValue: key))
                return raw.flatMap { $0.isEmpty ? nil : $0 }
            }
            return nil
        }
        
        displayName = value("displayname")
        avatarURL = value("avatar_url").flatMap(URL.init(string:))
        title = value("io.element.profile.title")
        firstName = value("io.element.profile.first_name")
        lastName = value("io.element.profile.last_name")
        specialty = value("io.element.profile.specialization")
        practiceName = value("io.element.profile.practice_name")
        furtherInfo = value("io.element.profile.further_info")
        businessEmail = value("io.element.profile.business_email")
        businessTel = value("io.element.profile.business_tel")
        street = value("io.element.profile.business_street", legacyKey: "io.element.profile.street")
        houseNumber = value("io.element.profile.business_street_nr", legacyKey: "io.element.profile.house_number")
        postalCode = value("io.element.profile.business_plz", legacyKey: "io.element.profile.postal_code")
        city = value("io.element.profile.business_city")
        website = value("io.element.profile.website")
    }
}