//
//  XCTLRuntimeContext.swift
//  notebook
//
//  Created by 邢铖 on 2023/5/18.
//

import Foundation
import UIKit

internal class XCTLRuntimeContext: XCTLRuntimeAbstractContext {
    
    public let nativeObjectInstance: NSObject
    
    public var nativeObjectMutations = [(String, XCTLRuntimeVariable)]()
    
    private let generators: [String : XCTLGenerateProtocol.Type]
    
    private var values = [String : XCTLRuntimeVariable]()
    
    internal private(set) var lazyRunStatements = [XCTLReferencedVariableStatement]()
    
    internal let stdout = XCTLStream(onAppendBlock: {
        print($0, terminator: "")
    })
    
    internal init(nativeObjectInstance: NSObject,
                  paragraphMembers: [String : XCTLStatement],
                  generators: [String : XCTLGenerateProtocol.Type]) {
        self.nativeObjectInstance = nativeObjectInstance
        self.generators = generators
        self.setValue(XCTLRuntimeVariable(funcImpl: {
            if $0.count == 1,
               let val = $0.first {
                if val.type != .typeString {
                    return .void
                }
                if let nativeImage = UIImage(named: val.stringValue) ?? UIImage(systemName: val.stringValue) {
                    return XCTLRuntimeVariable(rawObject: nativeImage)
                }
            }
            return .void
        }), forName: "image:")
        self.setValue(XCTLRuntimeVariable(funcImpl: {
            if $0.count == 1,
               let val = $0.first {
                if val.type == .typeString {
                    return XCTLRuntimeVariable(type: .typeString, rawValue: NSLocalizedString(val.stringValue, comment: ""))
                }
            }
            return .void
        }), forName: "string:")
        self.setValue(XCTLRuntimeVariable(funcImpl: {
            if $0.count == 2,
               let s1 = $0.first,
               let s2 = $0.last {
                if s1.type != .typeString {
                    return XCTLRuntimeVariable(type: .typeString, rawValue: NSLocalizedString(s1.stringValue, comment: ""))
                }
                if s2.type != .typeString {
                    return XCTLRuntimeVariable(type: .typeString, rawValue: NSLocalizedString(s2.stringValue, comment: ""))
                }
                if NSLocale.preferredLanguages.first?.hasPrefix("zh") ?? false || NSLocale.preferredLanguages.first?.hasPrefix("ch") ?? false {
                    return s2
                }
                return s1
            }
            return .void
        }), forNames: "stringWithEnglish:chinese:", "stringWithEn:ch:")
        self.setValue(XCTLRuntimeVariable(funcImpl: {
            if $0.count == 2,
               let s1 = $0.first,
               let s2 = $0.last {
                if s1.type != .typeString {
                    return XCTLRuntimeVariable(type: .typeString, rawValue: NSLocalizedString(s1.stringValue, comment: ""))
                }
                if s2.type != .typeString {
                    return XCTLRuntimeVariable(type: .typeString, rawValue: NSLocalizedString(s2.stringValue, comment: ""))
                }
                if NSLocale.preferredLanguages.first?.hasPrefix("zh") ?? false || NSLocale.preferredLanguages.first?.hasPrefix("ch") ?? false {
                    return s1
                }
                return s2
            }
            return .void
        }), forNames: "stringWithChinese:english:", "stringWithCh:en:")
        self.setValue(XCTLRuntimeVariable(funcImpl: {
            fatalError($0.first?.stringValue ?? "fatalError from XCT")
        }), forName: "appFatalError:")
        self.setValue(XCTLRuntimeVariable(funcImpl: {
            for (id, it) in $0.enumerated() {
                self.stdout.append(text: it.toString())
                if id != $0.count - 1 {
                    self.stdout.append(text: " ")
                }
            }
            return .void
        }), forNames: "log", "log:", "log:_:", "log:_:_:", "log:_:_:_:",
                      "log:_:_:_:_:", "log:_:_:_:_:_:", "log:_:_:_:_:_:_:", "log:_:_:_:_:_:_:_:")
        self.setValue(XCTLRuntimeVariable(funcImpl: {
            for (id, it) in $0.enumerated() {
                self.stdout.append(text: it.toString())
                if id != $0.count - 1 {
                    self.stdout.append(text: " ")
                }
            }
            self.stdout.append(text: "\n")
            return .void
        }), forNames: "logn", "logn:", "logn:_:", "logn:_:_:", "logn:_:_:_:",
                      "logn:_:_:_:_:", "logn:_:_:_:_:_:", "logn:_:_:_:_:_:_:", "logn:_:_:_:_:_:_:_:")
        self.setValue(XCTLRuntimeVariable(funcImpl: {
            var dest: Double = 0
            for it in $0 {
                if it.type == .typeNumber {
                    dest += it.doubleValue
                }
            }
            return XCTLRuntimeVariable(type: .typeNumber, rawValue: dest.description)
        }), forNames: "add", "add:", "add:_:", "add:_:_:", "add:_:_:_:",
                      "add:_:_:_:_:", "add:_:_:_:_:_:", "add:_:_:_:_:_:_:", "add:_:_:_:_:_:_:_:")
        self.setValue(XCTLRuntimeVariable(funcImpl: {
            var list = $0
            list = list.filter({ $0.type == .typeNumber })
            if list.isEmpty { return XCTLRuntimeVariable(type: .typeNumber, rawValue: "0") }
            var dest: Double = list.removeFirst().doubleValue
            for it in list {
                if it.type == .typeNumber {
                    dest -= it.doubleValue
                }
            }
            return XCTLRuntimeVariable(type: .typeNumber, rawValue: dest.description)
        }), forNames: "minus", "minus:", "minus:_:", "minus:_:_:", "minus:_:_:_:",
                      "minus:_:_:_:_:", "minus:_:_:_:_:_:", "minus:_:_:_:_:_:_:", "minus:_:_:_:_:_:_:_:")
        self.setValue(XCTLRuntimeVariable(funcImpl: {
            var dest: Double = 1
            for it in $0 {
                if it.type == .typeNumber {
                    dest *= it.doubleValue
                }
            }
            return XCTLRuntimeVariable(type: .typeNumber, rawValue: dest.description)
        }), forNames: "mult", "mult:", "mult:_:", "mult:_:_:", "mult:_:_:_:",
                      "mult:_:_:_:_:", "mult:_:_:_:_:_:", "mult:_:_:_:_:_:_:", "mult:_:_:_:_:_:_:_:")
        self.setValue(XCTLRuntimeVariable(funcImpl: {
            var list = $0
            list = list.filter({ $0.type == .typeNumber })
            if list.isEmpty { return XCTLRuntimeVariable(type: .typeNumber, rawValue: "0") }
            var dest: Double = list.removeFirst().doubleValue
            for it in list {
                if it.type == .typeNumber {
                    dest /= it.doubleValue
                }
            }
            return XCTLRuntimeVariable(type: .typeNumber, rawValue: dest.description)
        }), forNames: "div", "div:", "div:_:", "div:_:_:", "div:_:_:_:",
                      "div:_:_:_:_:", "div:_:_:_:_:_:", "div:_:_:_:_:_:_:", "div:_:_:_:_:_:_:_:")
        self.setValue(XCTLRuntimeVariable(funcImpl: {
            var begin: Double = 0
            var length: Double = 0
            var step: Double = 1
            let args = $0.filter({ $0.type == .typeNumber }).map({ $0.doubleValue })
            if args.count == 1 {
                length = args[0]
            }
            if args.count == 2 {
                begin = args[0]
                length = args[1]
            }
            if args.count == 3 {
                begin = args[0]
                length = args[1]
                step = args[2]
            }
            return XCTLRuntimeVariable(rawObject: XCTLRange(begin: begin, length: length, step: step))
        }), forNames: "range:", "range:_:", "range:_:_:")
        self.setValue(XCTLRuntimeVariable(type: .typeNumber, rawValue: "\(Bundle.main.infoDictionary?["CFBundleVersion"] as? String ?? "-1")"), forName: "appBundleVersion")
        for it in paragraphMembers {
            self.setValue(XCTLRuntimeVariable(funcImplStmt: it.value), forName: it.key)
        }
    }
    
    private var importNames = Set<String>()
    private var exportNames = Set<String>()
    
    internal func valueDefined(_ name: String) -> Bool {
        if self.importNames.contains(name) {
            return true
        }
        if self.values[name] != nil {
            return true
        }
        return false
    }
    
    internal func value(forName name: String) -> XCTLRuntimeVariable? {
        if name == "self" {
            return XCTLRuntimeVariable(rawObject: self.nativeObjectInstance)
        }
        if let value = self.values[name] {
            return value
        }
        if importNames.contains(name),
           let valueFromNative = self.nativeObjectInstance.value(forKey: name) as? NSObject {
            let object = XCTLRuntimeVariable(rawObject: valueFromNative)
            self.values[name] = object
            return object
        }
        if let klass: AnyObject = NSClassFromString(name),
           let klass = klass as? NSObject {
            return XCTLRuntimeVariable(rawObject: klass)
        }
        return .void
    }
    
    internal func setValue(_ value: XCTLRuntimeVariable, forName name: String) {
        self.setValue(value, forNames: name)
    }
    
    internal func setValue(_ value: XCTLRuntimeVariable, forNames names: String...) {
        for name in names {
            self.values[name] = value
            if exportNames.contains(name) {
                self.nativeObjectMutations.append((name, value))
            }
        }
    }
    
    internal func setValueToRootAssumeExport(_ value: XCTLRuntimeVariable, forName name: String) {
        self.values[name] = value
        self.nativeObjectMutations.append((name, value))
    }
    
    internal func setValueToRoot(_ value: XCTLRuntimeVariable, forName name: String, assumeExport export: Bool) {
        self.values[name] = value
        let doExport = export || self.exportNames.contains(name)
        if doExport {
            self.nativeObjectMutations.append((name, value))
        }
    }
    
    internal func applyNativeObjectMutations() {
        for it in self.nativeObjectMutations {
            let name = it.0
            let value = it.1
            guard let property = class_getProperty(self.nativeObjectInstance.classForCoder, name),
                  let propertyAttributes = property_getAttributes(property),
                  let propertyAttributes = NSString(cString: propertyAttributes, encoding: String.Encoding.utf8.rawValue) as? String else {
                print("[XCTLWarning] The export name \(name) does not match a valid @property in nativeInstance, did the property use static callable such as Swift? Use setValueForKey.")
                self.nativeObjectInstance.setValue(value.nativeValue, forKey: name)
                continue
            }
            do {
                let value = try value.nativeValue(typeId: propertyAttributes[propertyAttributes.index(after: propertyAttributes.startIndex)])
                self.nativeObjectInstance.setValue(value, forKey: name)
            } catch let err {
                fatalError("[XCTLEngine] \(err)")
            }
        }
    }
    
    internal func setValueIgnoreParent(_ value: XCTLRuntimeVariable, forName name: String) {
        self.setValue(value, forName: name)
    }
    
    internal func addImport(name: String) {
        self.importNames.insert(name)
    }
    
    internal func addExport(name: String) {
        self.exportNames.insert(name)
    }
    
    internal func hasExport(name: String) -> Bool {
        return self.exportNames.contains(name)
    }
    
    internal func allocateObject(name: String, args: [XCTLRuntimeVariable]) throws -> XCTLRuntimeVariable {
        if let generator = self.generators[name] {
            let nativeObject = try generator.initWithXCT(args.compactMap({ $0.nativeValue }))
            let object = XCTLRuntimeVariable(rawObject: nativeObject)
            return object
        }
        if let klass: AnyObject = NSClassFromString(name),
           let klass = klass as? NSObject {
            if let object = klass.perform(NSSelectorFromString("alloc")).takeRetainedValue() as? NSObject {
                let invocation = XCTLSwiftInvocation(target: object, selector: NSSelectorFromString("init"))
                let result = try invocation.invokeMemberFunc(params: [])
                return try XCTLRuntimeVariable.variableFromSwiftAny(result)
            }
        }
        throw XCTLRuntimeError.generateProtocolNotFoundedError(name: name)
    }
    
    internal func addLazyStatement(_ stmt: XCTLReferencedVariableStatement) {
        self.lazyRunStatements.append(stmt)
    }
    
    internal func clearLazyStatements() {
        self.lazyRunStatements.removeAll()
    }
    
    internal func makeSubContext() -> XCTLRuntimeAbstractContext {
        return XCTLRuntimeSubContext(parent: self)
    }
    
    private var conditionFrame: XCTLConditionParentStatementFrame?
    private var listFrame: XCTLListStatementFrame?
    private var forFrame: XCTLForStatementFrame?
    
    func findConditionFrame() -> XCTLConditionParentStatementFrame? {
        return self.conditionFrame
    }
    
    func findListFrame() -> XCTLListStatementFrame? {
        return self.listFrame
    }
    
    func recordListFrame(_ frame: XCTLListStatementFrame?) {
        self.listFrame = frame
    }
    
    func recordConditionFrame(_ frame: XCTLConditionParentStatementFrame?) {
        self.conditionFrame = frame
    }
    
    func findForFrame() -> XCTLForStatementFrame? {
        return self.forFrame
    }
    
    func recordForFrame(_ frame: XCTLForStatementFrame?) {
        self.forFrame = frame
    }
    
    func getParentContext() -> XCTLRuntimeAbstractContext? {
        return nil
    }
    
    var variableStack = XCTLRuntimeVariableStackFrame()
    
}