import Foundation
import JSONUtilities
import XcodeProj
import Version

public struct LegacyTarget: Equatable {
    public static let passSettingsDefault = false

    public var toolPath: String
    public var arguments: String?
    public var passSettings: Bool
    public var workingDirectory: String?

    public init(
        toolPath: String,
        passSettings: Bool = passSettingsDefault,
        arguments: String? = nil,
        workingDirectory: String? = nil
    ) {
        self.toolPath = toolPath
        self.arguments = arguments
        self.passSettings = passSettings
        self.workingDirectory = workingDirectory
    }
}

extension LegacyTarget: PathContainer {

    static var pathProperties: [PathProperty] {
        [
            .string("workingDirectory"),
        ]
    }
}

public struct Target: ProjectTarget {
    public var name: String
    public var type: PBXProductType
    public var platform: Platform
    public var supportedDestinations: [SupportedDestination]?
    public var settings: Settings
    public var sources: [TargetSource]
    public var dependencies: [Dependency]
    public var info: Plist?
    public var entitlements: Plist?
    public var transitivelyLinkDependencies: Bool?
    public var directlyEmbedCarthageDependencies: Bool?
    public var requiresObjCLinking: Bool?
    public var preBuildScripts: [BuildScript]
    public var buildToolPlugins: [BuildToolPlugin]
    public var postCompileScripts: [BuildScript]
    public var postBuildScripts: [BuildScript]
    public var buildRules: [BuildRule]
    public var configFiles: [String: String]
    public var scheme: TargetScheme?
    public var legacy: LegacyTarget?
    public var deploymentTarget: Version?
    public var attributes: [String: Any]
    public var productName: String
    public var onlyCopyFilesOnInstall: Bool
    public var putResourcesBeforeSourcesBuildPhase: Bool
    
    public var isLegacy: Bool {
        legacy != nil
    }

    public var filename: String {
        var filename = productName
        if let fileExtension = type.fileExtension {
            filename += ".\(fileExtension)"
        }
        if type == .staticLibrary {
            filename = "lib\(filename)"
        }
        return filename
    }

    public init(
        name: String,
        type: PBXProductType,
        platform: Platform,
        supportedDestinations: [SupportedDestination]? = nil,
        productName: String? = nil,
        deploymentTarget: Version? = nil,
        settings: Settings = .empty,
        configFiles: [String: String] = [:],
        sources: [TargetSource] = [],
        dependencies: [Dependency] = [],
        info: Plist? = nil,
        entitlements: Plist? = nil,
        transitivelyLinkDependencies: Bool? = nil,
        directlyEmbedCarthageDependencies: Bool? = nil,
        requiresObjCLinking: Bool? = nil,
        preBuildScripts: [BuildScript] = [],
        buildToolPlugins: [BuildToolPlugin] = [],
        postCompileScripts: [BuildScript] = [],
        postBuildScripts: [BuildScript] = [],
        buildRules: [BuildRule] = [],
        scheme: TargetScheme? = nil,
        legacy: LegacyTarget? = nil,
        attributes: [String: Any] = [:],
        onlyCopyFilesOnInstall: Bool = false,
        putResourcesBeforeSourcesBuildPhase: Bool = false
    ) {
        self.name = name
        self.type = type
        self.platform = platform
        self.supportedDestinations = supportedDestinations
        self.deploymentTarget = deploymentTarget
        self.productName = productName ?? name
        self.settings = settings
        self.configFiles = configFiles
        self.sources = sources
        self.dependencies = dependencies
        self.info = info
        self.entitlements = entitlements
        self.transitivelyLinkDependencies = transitivelyLinkDependencies
        self.directlyEmbedCarthageDependencies = directlyEmbedCarthageDependencies
        self.requiresObjCLinking = requiresObjCLinking
        self.preBuildScripts = preBuildScripts
        self.buildToolPlugins = buildToolPlugins
        self.postCompileScripts = postCompileScripts
        self.postBuildScripts = postBuildScripts
        self.buildRules = buildRules
        self.scheme = scheme
        self.legacy = legacy
        self.attributes = attributes
        self.onlyCopyFilesOnInstall = onlyCopyFilesOnInstall
        self.putResourcesBeforeSourcesBuildPhase = putResourcesBeforeSourcesBuildPhase
    }
}

extension Target: CustomStringConvertible {

    public var description: String {
        "\(name): \(platform.rawValue) \(type)"
    }
}

extension Target: PathContainer {

    static var pathProperties: [PathProperty] {
        [
            .dictionary([
                .string("sources"),
                .object("sources", TargetSource.pathProperties),
                .string("configFiles"),
                .object("dependencies", Dependency.pathProperties),
                .object("info", Plist.pathProperties),
                .object("entitlements", Plist.pathProperties),
                .object("preBuildScripts", BuildScript.pathProperties),
                .object("prebuildScripts", BuildScript.pathProperties),
                .object("postCompileScripts", BuildScript.pathProperties),
                .object("postBuildScripts", BuildScript.pathProperties),
                .object("legacy", LegacyTarget.pathProperties),
                .object("scheme", TargetScheme.pathProperties),
            ]),
        ]
    }
}

extension Target {

    static func resolveMultiplatformTargets(jsonDictionary: JSONDictionary) -> JSONDictionary {
        guard let targetsDictionary: [String: JSONDictionary] = jsonDictionary["targets"] as? [String: JSONDictionary] else {
            return jsonDictionary
        }
        
        var crossPlatformTargets: [String: JSONDictionary] = [:]

        for (targetName, target) in targetsDictionary {
            if let platforms = target["platform"] as? [String] {
                for platform in platforms {
                    var platformTarget = target
                    
                    /// This value is set to help us to check, in Target init, that there are no conflicts in the definition of the platforms. We want to ensure that the user didn't define, at the same time,
                    /// the new Xcode 14 supported destinations and the XcodeGen generation of Multiple Platform Targets (when you define the platform field as an array).
                    platformTarget["isMultiPlatformTarget"] = true

                    platformTarget = platformTarget.expand(variables: ["platform": platform])

                    platformTarget["platform"] = platform
                    let platformSuffix = platformTarget["platformSuffix"] as? String ?? "_\(platform)"
                    let platformPrefix = platformTarget["platformPrefix"] as? String ?? ""
                    let newTargetName = platformPrefix + targetName + platformSuffix

                    var settings = platformTarget["settings"] as? JSONDictionary ?? [:]
                    if settings["configs"] != nil || settings["groups"] != nil || settings["base"] != nil {
                        var base = settings["base"] as? JSONDictionary ?? [:]
                        if base["PRODUCT_NAME"] == nil {
                            base["PRODUCT_NAME"] = targetName
                        }
                        settings["base"] = base
                    } else {
                        if settings["PRODUCT_NAME"] == nil {
                            settings["PRODUCT_NAME"] = targetName
                        }
                    }
                    platformTarget["productName"] = targetName
                    platformTarget["settings"] = settings
                    if let deploymentTargets = target["deploymentTarget"] as? [String: Any] {
                        platformTarget["deploymentTarget"] = deploymentTargets[platform]
                    }
                    crossPlatformTargets[newTargetName] = platformTarget
                }
            } else {
                crossPlatformTargets[targetName] = target
            }
        }
        
        var merged = jsonDictionary
        merged["targets"] = crossPlatformTargets
        return merged
    }
}

extension Target: Equatable {

    public static func == (lhs: Target, rhs: Target) -> Bool {
        lhs.name == rhs.name &&
            lhs.type == rhs.type &&
            lhs.platform == rhs.platform &&
            lhs.deploymentTarget == rhs.deploymentTarget &&
            lhs.transitivelyLinkDependencies == rhs.transitivelyLinkDependencies &&
            lhs.requiresObjCLinking == rhs.requiresObjCLinking &&
            lhs.directlyEmbedCarthageDependencies == rhs.directlyEmbedCarthageDependencies &&
            lhs.settings == rhs.settings &&
            lhs.configFiles == rhs.configFiles &&
            lhs.sources == rhs.sources &&
            lhs.info == rhs.info &&
            lhs.entitlements == rhs.entitlements &&
            lhs.dependencies == rhs.dependencies &&
            lhs.preBuildScripts == rhs.preBuildScripts &&
            lhs.buildToolPlugins == rhs.buildToolPlugins &&
            lhs.postCompileScripts == rhs.postCompileScripts &&
            lhs.postBuildScripts == rhs.postBuildScripts &&
            lhs.buildRules == rhs.buildRules &&
            lhs.scheme == rhs.scheme &&
            lhs.legacy == rhs.legacy &&
            NSDictionary(dictionary: lhs.attributes).isEqual(to: rhs.attributes)
    }
}

extension LegacyTarget: JSONObjectConvertible {

    public init(jsonDictionary: JSONDictionary) throws {
        toolPath = try jsonDictionary.json(atKeyPath: "toolPath")
        arguments = jsonDictionary.json(atKeyPath: "arguments")
        passSettings = jsonDictionary.json(atKeyPath: "passSettings") ?? LegacyTarget.passSettingsDefault
        workingDirectory = jsonDictionary.json(atKeyPath: "workingDirectory")
    }
}

extension LegacyTarget: JSONEncodable {
    public func toJSONValue() -> Any {
        var dict: [String: Any?] = [
            "toolPath": toolPath,
            "arguments": arguments,
            "workingDirectory": workingDirectory,
        ]

        if passSettings != LegacyTarget.passSettingsDefault {
            dict["passSettings"] = passSettings
        }

        return dict
    }
}

extension Target: NamedJSONDictionaryConvertible {

    public init(name: String, jsonDictionary: JSONDictionary) throws {
        let resolvedName: String = jsonDictionary.json(atKeyPath: "name") ?? name
        self.name = resolvedName
        productName = jsonDictionary.json(atKeyPath: "productName") ?? resolvedName
        
        let typeString: String = jsonDictionary.json(atKeyPath: "type") ?? ""
        if let type = PBXProductType(string: typeString) {
            self.type = type
        } else {
            throw SpecParsingError.unknownTargetType(typeString)
        }
        
        if let supportedDestinations: [SupportedDestination] = jsonDictionary.json(atKeyPath: "supportedDestinations") {
            self.supportedDestinations = supportedDestinations
        }
        
        let isResolved = jsonDictionary.json(atKeyPath: "isMultiPlatformTarget") ?? false
        if isResolved, supportedDestinations != nil {
            throw SpecParsingError.invalidTargetPlatformAsArray
        }
        
        var platformString: String = jsonDictionary.json(atKeyPath: "platform") ?? ""
        // platform defaults to 'auto' if it is empty and we are using supported destinations
        if supportedDestinations != nil, platformString.isEmpty {
            platformString = Platform.auto.rawValue
        }
        // we add 'iOS' in supported destinations if it contains only 'macCatalyst'
        if supportedDestinations?.contains(.macCatalyst) == true,
           supportedDestinations?.contains(.iOS) == false {
            
            supportedDestinations?.append(.iOS)
        }
        
        if let platform = Platform(rawValue: platformString) {
            self.platform = platform
        } else {
            throw SpecParsingError.unknownTargetPlatform(platformString)
        }
        
        if let string: String = jsonDictionary.json(atKeyPath: "deploymentTarget") {
            deploymentTarget = try Version.parse(string)
        } else if let double: Double = jsonDictionary.json(atKeyPath: "deploymentTarget") {
            deploymentTarget = try Version.parse(String(double))
        } else {
            deploymentTarget = nil
        }

        settings = try BuildSettingsParser(jsonDictionary: jsonDictionary).parse()
        configFiles = jsonDictionary.json(atKeyPath: "configFiles") ?? [:]
        if let source: String = jsonDictionary.json(atKeyPath: "sources") {
            sources = [TargetSource(path: source)]
        } else if let array = jsonDictionary["sources"] as? [Any] {
            sources = try array.compactMap { source in
                if let string = source as? String {
                    return TargetSource(path: string)
                } else if let dictionary = source as? [String: Any] {
                    return try TargetSource(jsonDictionary: dictionary)
                } else {
                    return nil
                }
            }
        } else {
            sources = []
        }
        if jsonDictionary["dependencies"] == nil {
            dependencies = []
        } else {
            let dependencies: [Dependency] = try jsonDictionary.json(atKeyPath: "dependencies", invalidItemBehaviour: .fail)
            self.dependencies = dependencies.filter { [platform] dependency -> Bool in
                // If unspecified, all platforms are supported
                guard let platforms = dependency.platforms else { return true }
                return platforms.contains(platform)
            }
        }
        
        if jsonDictionary["buildToolPlugins"] == nil {
            buildToolPlugins = []
        } else {
            self.buildToolPlugins = try jsonDictionary.json(atKeyPath: "buildToolPlugins", invalidItemBehaviour: .fail)
        }
        
        if jsonDictionary["info"] != nil {
            info = try jsonDictionary.json(atKeyPath: "info") as Plist
        }
        if jsonDictionary["entitlements"] != nil {
            entitlements = try jsonDictionary.json(atKeyPath: "entitlements") as Plist
        }

        transitivelyLinkDependencies = jsonDictionary.json(atKeyPath: "transitivelyLinkDependencies")
        directlyEmbedCarthageDependencies = jsonDictionary.json(atKeyPath: "directlyEmbedCarthageDependencies")
        requiresObjCLinking = jsonDictionary.json(atKeyPath: "requiresObjCLinking")

        preBuildScripts = jsonDictionary.json(atKeyPath: "preBuildScripts") ?? jsonDictionary.json(atKeyPath: "prebuildScripts") ?? []
        postCompileScripts = jsonDictionary.json(atKeyPath: "postCompileScripts") ?? []
        postBuildScripts = jsonDictionary.json(atKeyPath: "postBuildScripts") ?? jsonDictionary.json(atKeyPath: "postbuildScripts") ?? []
        buildRules = jsonDictionary.json(atKeyPath: "buildRules") ?? []
        scheme = jsonDictionary.json(atKeyPath: "scheme")
        legacy = jsonDictionary.json(atKeyPath: "legacy")
        attributes = jsonDictionary.json(atKeyPath: "attributes") ?? [:]
        onlyCopyFilesOnInstall = jsonDictionary.json(atKeyPath: "onlyCopyFilesOnInstall") ?? false
        putResourcesBeforeSourcesBuildPhase = jsonDictionary.json(atKeyPath: "putResourcesBeforeSourcesBuildPhase") ?? false
    }
}

extension Target: JSONEncodable {
    public func toJSONValue() -> Any {
        var dict: [String: Any?] = [
            "type": type.name,
            "platform": platform.rawValue,
            "supportedDestinations": supportedDestinations?.map { $0.rawValue },
            "settings": settings.toJSONValue(),
            "configFiles": configFiles,
            "attributes": attributes,
            "sources": sources.map { $0.toJSONValue() },
            "dependencies": dependencies.map { $0.toJSONValue() },
            "postCompileScripts": postCompileScripts.map { $0.toJSONValue() },
            "prebuildScripts": preBuildScripts.map { $0.toJSONValue() },
            "buildToolPlugins": buildToolPlugins.map { $0.toJSONValue() },
            "postbuildScripts": postBuildScripts.map { $0.toJSONValue() },
            "buildRules": buildRules.map { $0.toJSONValue() },
            "deploymentTarget": deploymentTarget?.deploymentTarget,
            "info": info?.toJSONValue(),
            "entitlements": entitlements?.toJSONValue(),
            "transitivelyLinkDependencies": transitivelyLinkDependencies,
            "directlyEmbedCarthageDependencies": directlyEmbedCarthageDependencies,
            "requiresObjCLinking": requiresObjCLinking,
            "scheme": scheme?.toJSONValue(),
            "legacy": legacy?.toJSONValue(),
        ]

        if productName != name {
            dict["productName"] = productName
        }

        if onlyCopyFilesOnInstall {
            dict["onlyCopyFilesOnInstall"] = true
        }

        if putResourcesBeforeSourcesBuildPhase {
            dict["putResourcesBeforeSourcesBuildPhase"] = true
        }

        return dict
    }
}