import Foundation
import XcodeProjects

public struct XcodePacker {
    public var plan: Plan

    public init(plan: Plan) {
        self.plan = plan
    }

    // swiftlint:disable:next function_body_length
    public func createProject(
        at root: URL = URL(fileURLWithPath: FileManager.default.currentDirectoryPath, isDirectory: true)
    ) async throws -> URL {
        let xtoolDir = root.appendingPathComponent("xtool", isDirectory: true)
        let projectDir = xtoolDir.appendingPathComponent(".xtool-tmp", isDirectory: true)
        try? FileManager.default.removeItem(at: projectDir)
        try FileManager.default.createDirectory(at: projectDir, withIntermediateDirectories: true)

        let fromProjectToRoot = "../.."

        let emptyText = Data("// leave this file empty".utf8)
        let products = plan.allProducts
        let targetIDs = products.map {
            XCSchema.ObjectID("xtool:\($0.product)")
        }
        let sourcePhase = XCSchema.BuildPhase.sources(.init(objectID: nil, name: nil))
        let frameworksPhase = XCSchema.BuildPhase.frameworks(.init(objectID: nil, name: nil))

        var groups: [XCSchema.Reference] = []
        var productFiles: [XCSchema.Reference] = []
        var targets: [XCSchema.Target] = []

        for (index, product) in products.enumerated() {
            let productDir = projectDir.appendingPathComponent(product.product, isDirectory: true)
            try FileManager.default.createDirectory(at: productDir, withIntermediateDirectories: true)
            try emptyText.write(to: productDir.appendingPathComponent("empty.c"))

            var plist = product.infoPlist
            let families = (plist.removeValue(forKey: "UIDeviceFamily") as? [Int]) ?? [1, 2]
            plist["CFBundleExecutable"] = product.targetName
            plist["CFBundleName"] = product.targetName
            plist["CFBundleDisplayName"] = product.product
            if let iconPath = product.iconPath {
                plist["CFBundleIconFile"] = URL(fileURLWithPath: iconPath).deletingPathExtension().lastPathComponent
            }
            let encodedPlist = try PropertyListSerialization.data(fromPropertyList: plist, format: .xml, options: 0)
            try encodedPlist.write(to: productDir.appendingPathComponent("Info.plist"))

            var buildSettings: [String: XCSchema.BuildSetting] = [
                "PRODUCT_BUNDLE_IDENTIFIER": .string(product.bundleID),
                "PRODUCT_NAME": .string(product.targetName),
                "TARGETED_DEVICE_FAMILY": .string(families.map(String.init).joined(separator: ",")),
                "IPHONEOS_DEPLOYMENT_TARGET": .string(product.deploymentTarget),
                "INFOPLIST_FILE": .string("\(product.product)/Info.plist"),
                "LD_RUNPATH_SEARCH_PATHS": .array(["$(inherited)", "@executable_path/Frameworks"]),
            ]
            if product.type == .appExtension {
                buildSettings["APPLICATION_EXTENSION_API_ONLY"] = .string("YES")
                buildSettings["LD_RUNPATH_SEARCH_PATHS"] = .array([
                    "$(inherited)", "@executable_path/Frameworks", "@executable_path/../../Frameworks",
                ])
            }
            if let entitlementsPath = product.entitlementsPath {
                let path = (entitlementsPath as NSString).isAbsolutePath
                    ? entitlementsPath
                    : (fromProjectToRoot as NSString).appendingPathComponent(entitlementsPath)
                buildSettings["CODE_SIGN_ENTITLEMENTS"] = .string(path)
            }

            let source = XCSchema.FileReference(
                objectID: nil,
                path: "empty.c",
                explicitFileType: nil,
                expectedSignature: nil,
                textEncoding: nil,
                lineEnding: nil,
                includeInIndex: nil,
                buildFiles: [.init(
                    objectID: nil,
                    buildPhase: .named(
                        target: .init(targetName: product.targetName),
                        kind: .sources,
                        name: nil
                    ),
                    properties: buildFileProperties(),
                )],
            )
            let info = XCSchema.FileReference(
                objectID: nil,
                path: "Info.plist",
                explicitFileType: nil,
                expectedSignature: nil,
                textEncoding: nil,
                lineEnding: nil,
                includeInIndex: nil,
                buildFiles: [],
            )
            let resources = try resourceReferences(for: product, at: root)
            groups.append(.group(.init(
                objectID: nil,
                name: product.product,
                path: try .init(base: .group, path: product.product),
                includeInIndex: nil,
                children: [.fileReference(source), .fileReference(info)] + resources,
            )))

            let productFilename = "\(product.targetName).\(product.type == .application ? "app" : "appex")"
            let productFile = XCSchema.FileReference(
                objectID: nil,
                path: try .init(base: .buildProducts, path: productFilename),
                explicitFileType: .init(fileTypeID: product.type == .application ? "wrapper.application" : "wrapper.app-extension"),
                expectedSignature: nil,
                textEncoding: nil,
                lineEnding: nil,
                includeInIndex: false,
                buildFiles: index == 0 ? [] : [.init(
                    objectID: nil,
                    buildPhase: .named(
                        target: .init(targetName: plan.app.targetName),
                        kind: .copy,
                        name: "Embed App Extensions",
                    ),
                    properties: buildFileProperties(removeHeadersOnCopy: true),
                )],
            )
            productFiles.append(.fileReference(productFile))

            let packageProduct = XCSchema.SwiftPackageProductReference(
                objectID: nil,
                package: nil,
                productName: product.product,
                productType: .other,
            )
            let packageMember = XCSchema.SwiftPackageProductTargetMember(
                packageProduct: packageProduct,
                buildFile: .init(
                    objectID: nil,
                    buildPhase: .named(kind: .frameworks, name: nil),
                    properties: buildFileProperties(),
                ),
            )
            var phases = [sourcePhase, frameworksPhase]
            if !resources.isEmpty {
                phases.append(.copy(.init(
                    objectID: nil,
                    name: "Copy Root Resources",
                    bundleBasePath: .resourcesDir,
                    relativePath: "",
                    scope: .always,
                )))
            }
            if index == 0 && !plan.extensions.isEmpty {
                phases.append(.copy(.init(
                    objectID: nil,
                    name: "Embed App Extensions",
                    bundleBasePath: .plugInsDir,
                    relativePath: "",
                    scope: .always,
                )))
            }
            let dependencies: [XCSchema.TargetDependency] = index == 0
                ? plan.extensions.map {
                    .localTarget(XCSchema.LocalTargetReference(targetName: $0.targetName), [])
                }
                : []
            targets.append(.native(XCSchema.CommonTargetProperties(
                name: product.targetName,
                objectID: targetIDs[index],
                configurationListDebugID: nil,
                dependencies: dependencies,
                buildPhases: phases,
                buildRules: [],
                specializedConfigurations: [],
                buildSettings: buildSettings,
                product: .namePath(.init(components: [.child("Products"), .child(productFilename)])),
                productTypeID: XCSchema.ProductTypeID(
                    abbreviatedRepresentation: product.type == .application
                    ? "application"
                    : "app-extension"
                ),
                testHostTarget: nil,
                legacyProvisioningStyle: nil,
                legacyTeamID: nil,
                lastSwiftUpdateCheck: nil,
                lastSwiftMigration: nil,
                packageProductTargetMembers: [packageMember],
            )))
        }

        let schema = XCSchema.Project(
            objectID: nil,
            rootGroupDebugID: nil,
            configurationListDebugID: nil,
            topLevelReferences: groups + [
                .group(XCSchema.Group(
                    objectID: nil,
                    name: "Products",
                    path: "",
                    includeInIndex: nil,
                    children: productFiles,
                ))
            ],
            packages: [.init(location: .local(.init(path: fromProjectToRoot)), traits: [])],
            configurations: ["Debug", "Release"].map {
                .init(name: .init(name: $0), file: nil, objectID: nil)
            },
            buildSettings: ["SDKROOT": .string("iphoneos")],
            defaultConfigurationName: .init(name: "Debug"),
            targets: targets,
            localizationInfo: .init(development: .init(languageID: "en"), supported: []),
            requiredCapabilities: [],
            buildIndependentTargetsInParallel: true,
            lastUpgradeCheck: nil,
            lastSwiftUpdateCheck: nil,
            lastSwiftMigration: nil,
            organizationName: nil,
            classPrefix: nil,
            productsGroup: .namePath(.init(components: [.child("Products")])),
            importedProducts: [],
        )

        let project = XcodeProject(project: schema)
        let projectURL = projectDir.appending(path: "\(plan.app.product).xcodeproj")
        try project.write(to: projectURL)

        let workspace = XcodeWorkspace(children: [
            .file(XcodeWorkspace.Location(base: .container, path: "..")),
            .file(XcodeWorkspace.Location(base: .group, path: ".xtool-tmp/\(projectURL.lastPathComponent)"))
        ])
        let workspaceURL = xtoolDir.appending(path: "\(plan.app.product).xcworkspace")
        try workspace.write(to: workspaceURL)
        return workspaceURL
    }

    private func resourceReferences(for product: Plan.Product, at root: URL) throws -> [XCSchema.Reference] {
        var paths = product.resources.compactMap { resource -> String? in
            guard case .root(let source) = resource else { return nil }
            return source
        }
        if let iconPath = product.iconPath {
            paths.append(iconPath)
        }

        var visited: Set<String> = []
        return try paths.compactMap { path in
            let url = URL(fileURLWithPath: path, relativeTo: root).standardizedFileURL
            guard visited.insert(url.path).inserted else { return nil }
            let isAbsolute = (path as NSString).isAbsolutePath
            let referencePath = isAbsolute ? path : ("../.." as NSString).appendingPathComponent(path)
            var isDirectory: ObjCBool = false
            _ = FileManager.default.fileExists(atPath: url.path, isDirectory: &isDirectory)

            return .fileReference(.init(
                objectID: nil,
                path: try .init(base: isAbsolute ? .absolute : .project, path: referencePath),
                explicitFileType: isDirectory.boolValue ? .init(fileTypeID: "folder") : nil,
                expectedSignature: nil,
                textEncoding: nil,
                lineEnding: nil,
                includeInIndex: nil,
                buildFiles: [.init(
                    objectID: nil,
                    buildPhase: .named(
                        target: .init(targetName: product.targetName),
                        kind: .copy,
                        name: "Copy Root Resources",
                    ),
                    properties: buildFileProperties(),
                )],
            ))
        }
    }

    private func buildFileProperties(removeHeadersOnCopy: Bool = false) -> XCSchema.BuildFileProperties {
        XCSchema.BuildFileProperties(
            platformFilters: [],
            additionalBuildFlags: nil,
            assetTags: [],
            attributes: XCSchema.BuildFileAttributes(
                headerRole: nil,
                machInterfaceGeneration: nil,
                isWeak: false,
                codeSignOnCopy: false,
                codeGeneration: .default,
                headerPreservation: removeHeadersOnCopy ? .removeOnCopy : .keep,
                decompress: false,
                codeGenerationVisibility: nil,
            ),
        )
    }
}