import { ConsoleAdapter } from "./consolewriter.js";
import inspect from "./inspect.js";
import {
   Adapter,
   DefaultFormatConfig,
   Format,
   FormatConfig,
   Formatted,
   LoggingTypes,
   Message,
} from "./types.js";

const browser = typeof window !== "undefined";

export interface ILoggingTimer {
   end: () => number;
}

export interface ILoggingInterface {
   debug(...message: any[]): void;
   log(...message: any[]): void;
   warn(...message: any[]): void;
   error(...message: any[]): void;

   time(name?: string): ILoggingTimer;
   timeEnd(id: string): number;

   getChild(name: string): ILoggingInterface;
}

export interface ILoggingOptions {
   /**
    * Name will be prefixed on Console output and added to logfiles, if not specified here
    */
   name: string;
   /**
    * Prints output to console
    */
   console: boolean;

   /**
    * Enables printing of calling file
    */
   resolve_filename: boolean;
}

export interface INativeFunctions {
   startTimer(): any;
   endTimer(start: any): number;
}

export const DefaultNativeFunctions = {
   startTimer: () => {
      if (browser && window.performance && window.performance.now) {
         return window.performance.now();
      } else {
         return Date.now();
      }
   },
   endTimer: (start: any) => {
      if (browser && window.performance && window.performance.now) {
         return window.performance.now() - start;
      } else {
         return Date.now() - start;
      }
   },
} as INativeFunctions;

const consoleAdapter = new ConsoleAdapter();
declare var process: { cwd: () => string };
const PROJECT_ROOT = typeof process !== "undefined" ? process.cwd() : undefined;

const InitialisedAdapters = Symbol("@hibas123/logging:initialisedAdapters");

export abstract class LoggingInterface implements ILoggingInterface {
   #names: string[];
   #timerMap = new Map<string, { name: string; start: any }>();

   get names() {
      return [...this.#names];
   }

   protected abstract message(
      type: LoggingTypes,
      names: string[],
      message: any[],
      caller?: { file: string; line: number; column?: number }
   ): void;

   constructor(names: string[]) {
      this.#names = names;
   }

   debug(...message: any[]) {
      this.message(LoggingTypes.Debug, this.#names, message);
   }

   log(...message: any[]) {
      this.message(LoggingTypes.Log, this.#names, message);
   }

   warning(...message: any[]) {
      this.message(LoggingTypes.Warn, this.#names, message);
   }

   warn(...message: any[]) {
      this.message(LoggingTypes.Warn, this.#names, message);
   }

   error(error: Error | string, ...message: any[]) {
      if (!error)
         error = "Empty ERROR was passed, so no informations available";
      if (typeof error === "string") {
         let e = new Error("This is a fake error, to get a stack trace");
         this.message(LoggingTypes.Error, this.#names, [
            error,
            ...message,
            "\n",
            e.stack,
            "\n",
         ]);
      } else {
         this.message(
            LoggingTypes.Error,
            this.#names,
            [error.message, "\n", error.stack, "\n", ...message],
            getCallerFromExisting(error)
         );
      }
   }

   time(id?: string) {
      if (!id) id = Math.floor(Math.random() * 899999 + 100000).toString();

      this.#timerMap.set(id, {
         name: id,
         start: LoggingBase.nativeFunctions.startTimer(),
      });

      return {
         id,
         end: () => this.timeEnd(id),
      };
   }

   timeEnd(id: string) {
      let timer = this.#timerMap.get(id);
      if (timer) {
         let diff = LoggingBase.nativeFunctions.endTimer(timer.start);

         this.message(LoggingTypes.Debug, this.#names, [
            Format.green(`[${timer.name}]`),
            `->`,
            Format.blue(diff.toFixed(4)),
            "ms",
         ]);

         return diff;
      }
      return -1;
   }

   abstract getChild(name: string): ILoggingInterface;
}

export class LoggingBase extends LoggingInterface {
   private static [InitialisedAdapters] = new Map<Adapter, number>();
   public static nativeFunctions: INativeFunctions = DefaultNativeFunctions;

   static DecoupledLogging = class extends LoggingInterface {
      #lg: LoggingBase;
      constructor(names: string[], lg: LoggingBase) {
         super(names);
         this.#lg = lg;
      }

      message(...params: [any, any, any, any]) {
         this.#lg.message(...params);
      }

      getChild(name: string) {
         return new LoggingBase.DecoupledLogging([this.names, name], this.#lg);
      }
   };

   #closed = false;
   #logLevel = LoggingTypes.Debug;
   #resolve_filename: boolean;
   #format_map: FormatConfig = new DefaultFormatConfig();
   #adapters = new Set<Adapter>();

   set logLevel(level: LoggingTypes) {
      this.#logLevel = level;
   }

   get logLevel() {
      return this.#logLevel;
   }

   constructor(options?: Partial<ILoggingOptions>) {
      super(options?.name ? [options.name] : []);
      options = {
         console: true,
         resolve_filename: true,
         ...options,
      };

      if (options.console) {
         this.addAdapter(consoleAdapter);
      }

      for (const key in this) {
         if (typeof this[key] === "function") {
            this[key] = ((this[key] as never) as Function).bind(this);
         }
      }
   }

   async addAdapter(adapter: Adapter) {
      const init = adapter.init();

      const add = () => {
         this.#adapters.add(adapter);
         if (LoggingBase[InitialisedAdapters].has(adapter)) {
            LoggingBase[InitialisedAdapters].set(
               adapter,
               LoggingBase[InitialisedAdapters].get(adapter) + 1
            );
         } else {
            LoggingBase[InitialisedAdapters].set(adapter, 1);
         }
      };

      if (!init) {
         add();
      } else {
         Promise.resolve(init).then(add);
      }
   }

   getChild(name: string): ILoggingInterface {
      return new LoggingBase.DecoupledLogging([...this.names, name], this);
   }

   protected message(
      type: LoggingTypes,
      names: string[],
      message: any[],
      caller?: { file: string; line: number; column?: number }
   ) {
      if (this.#logLevel > type) return;
      if (this.#closed) {
         //TODO: Maybe error?
         return;
      }

      const date = new Date();
      const date_str = date.toISOString().replace(/T/, " ").replace(/\..+/, "");

      let file: string | undefined = undefined;
      if (this.#resolve_filename) {
         let file_raw = caller;
         if (!file_raw) {
            try {
               file_raw = getCallerFile();
            } catch (err) {
               file_raw = {
                  file: "<unknown>",
                  line: 0,
                  column: 0,
               };
            }
         }

         if (
            PROJECT_ROOT &&
            file_raw.file &&
            file_raw.file.startsWith(PROJECT_ROOT)
         ) {
            let newF = file_raw.file.substring(PROJECT_ROOT.length);

            if (newF.startsWith("/") || newF.startsWith("\\"))
               newF = newF.substring(1);

            file_raw.file = newF;
         }
         file = `${file_raw.file || "<unknown>"}:${file_raw.line}:${
            file_raw.column || 0
         }`;
      }

      let type_str = LoggingTypes[type].toUpperCase().padEnd(5, " ");
      let type_format: Formatted;
      switch (type) {
         case LoggingTypes.Log:
            type_format = this.#format_map.log;
            break;
         case LoggingTypes.Error:
            type_format = this.#format_map.error;
            break;
         case LoggingTypes.Debug:
            type_format = this.#format_map.debug;
            break;
         case LoggingTypes.Warn:
            type_format = this.#format_map.warning;
            break;
      }

      const nameFormatted: Formatted<string>[] = [];
      if (names.length > 0) {
         nameFormatted.push(new Formatted("["));
         for (let i = 0; i < names.length; i++) {
            nameFormatted.push(new Formatted(names[i], this.#format_map.names));
            if (i < names.length - 1) {
               nameFormatted.push(this.#format_map.names_delimiter);
            }
         }
         nameFormatted.push(new Formatted("]"));
      }

      let linePrefix = [
         new Formatted("["),
         new Formatted(date_str, this.#format_map.date),
         new Formatted("]["),
         new Formatted(type_str, type_format),
         ...(file
            ? [new Formatted("]["), new Formatted(file, this.#format_map.file)]
            : []),
         new Formatted("]"),
         ...nameFormatted,
         new Formatted(": "),
      ];

      // let linePrefix = [
      //    ...namePrefix,
      //    new Formatted(date_str, this.#format_map.date),
      //    new Formatted("  "),
      //    new Formatted(type_str, type_format),
      //    ...(file
      //       ? [new Formatted("  "), new Formatted(file, this.#format_map.file)]
      //       : []),
      //    new Formatted("| "),
      // ];

      let formattedMessage: Formatted<string>[] = [...linePrefix];
      message.forEach((msg, idx) => {
         let format = new Formatted();
         if (msg instanceof Formatted) {
            format = msg;
            msg = msg.content;
         }

         if (typeof msg !== "string") {
            msg = inspect(msg, {
               colors: false, //TODO: Maybe change when changing the removeColors to return formatted text?
               showHidden: true,
               depth: 3,
            }) as string;
         }

         removeColors(msg)
            .split("\n")
            .forEach((text, index, { length }) => {
               if (index != length - 1) {
                  formattedMessage.push(
                     new Formatted(text + "\n", format),
                     ...linePrefix
                  );
               } else {
                  formattedMessage.push(new Formatted(text, format));
               }
            });
         formattedMessage.push(new Formatted(" "));
      });

      let msg: Message = {
         date,
         file,
         names,
         text: formattedMessage,
         type,
      };

      this.#adapters.forEach((adapter) => adapter.onMessage(msg));
   }

   async close() {
      if (this.#closed) return;
      this.#closed = true;

      this.#adapters.forEach((adapter) => {
         const cnt = LoggingBase[InitialisedAdapters].get(adapter);
         if (!cnt) {
            //TODO: should not happen!
         } else {
            if (cnt <= 1) {
               adapter.close();
               LoggingBase[InitialisedAdapters].delete(adapter);
            } else {
               LoggingBase[InitialisedAdapters].set(adapter, cnt - 1);
            }
         }
      });
   }
}

function getStack() {
   // Save original Error.prepareStackTrace
   let origPrepareStackTrace = (<any>Error).prepareStackTrace;
   try {
      // Override with function that just returns `stack`
      (<any>Error).prepareStackTrace = function (_, stack) {
         return stack;
      };

      // Create a new `Error`, which automatically gets `stack`
      let err = new Error();

      // Evaluate `err.stack`, which calls our new `Error.prepareStackTrace`
      let stack: any[] = <any>err.stack;

      return stack;
   } finally {
      // Restore original `Error.prepareStackTrace`
      (<any>Error).prepareStackTrace = origPrepareStackTrace;
   }
}

function getCallerFile() {
   try {
      let stack = getStack();

      let current_file = stack.shift().getFileName();

      while (stack.length) {
         let caller_file = stack.shift();
         if (current_file !== caller_file.getFileName()) {
            return {
               file: caller_file.getFileName(),
               line: caller_file.getLineNumber(),
               column: caller_file.getColumnNumber(),
            };
         }
      }
   } catch (err) {}
   return { file: undefined, line: 0 };
}

function getCallerFromExisting(
   err: Error
): { file: string; line: number; column?: number } {
   if (!err || !err.stack) return { file: "NOFILE", line: 0 };
   let lines = err.stack.split("\n");
   lines.shift(); // removing first line
   while (lines.length > 0) {
      let line = lines.shift();
      let matches = line.match(
         /[<]?([a-zA-Z]:)?([\/\\]?[a-zA-Z_-])+[.>][a-zA-Z_-]*([:][0-9]+)+/g
      );
      if (matches && matches.length > 0) {
         let match = matches[0].trim();
         let locationString = match.match(/([:][0-9]+)+$/gm)[0];
         let line: number;
         let column: number;
         if (locationString) {
            match = match.slice(0, match.length - locationString.length);
            locationString = locationString.substring(1);
            [line, column] = locationString.split(":").map(Number);
         }
         let file = match;
         return {
            file,
            line,
            column,
         };
      }
   }
}

export function removeColors(text: string) {
   text = text.replace(
      /[\u001b\u009b][[()#;?]*(?:[0-9]{1,4}(?:;[0-9]{0,4})*)?[0-9A-ORZcf-nqry=><]/g,
      ""
   );

   return text;
}