/*
Copyright 2023-2026 SolarWinds Worldwide, LLC.

Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at

    http://www.apache.org/licenses/LICENSE-2.0

Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.
*/

import process from "node:process"
import util from "node:util"

import { type DiagLogFunction, type DiagLogger } from "@opentelemetry/api"
import stringify from "json-stringify-safe"

import log from "./commonjs/log.js"
import { type Configuration } from "./config.js"

const COLOURS = {
  red: "\x1b[1;31m",
  yellow: "\x1b[1;33m",
  cyan: "\x1b[1;36m",
}

/** Node.js logger that outputs nice coloured messages in TTYs and JSON otherwise */
export class Logger implements DiagLogger {
  readonly error = this.#makeLogger("error", "red", console.error)
  readonly warn = this.#makeLogger("warn", "yellow", console.warn)
  readonly info = this.#makeLogger("info", "cyan")
  readonly debug = this.#makeLogger("debug")
  readonly verbose = this.#makeLogger("verbose")

  readonly #token?: string
  constructor(config: Configuration) {
    this.#token = config.token
  }

  #makeLogger(
    level: string,
    colour?: keyof typeof COLOURS,
    pretty: typeof console.log = console.log,
  ): DiagLogFunction {
    if (process.stdout.isTTY && process.stdout.hasColors(16)) {
      const colourCode = colour && COLOURS[colour]

      return (message, ...args) => {
        let line = `[${new Date().toISOString()}] (`

        if (colourCode) {
          line += colourCode
        }
        line += level.toUpperCase()
        if (colourCode) {
          line += "\x1b[0m"
        }

        line += `) ${message}`
        for (const arg of args) {
          const string =
            typeof arg === "string" ? arg : util.inspect(arg, false, 4, true)
          line += ` ${string}`
        }

        pretty(this.#redact(line))
      }
    } else {
      return (message, ...args) => {
        while (typeof args[0] === "string") {
          message += ` ${args.shift() as string}`
        }

        log(this.#redact(stringify({ time: new Date(), level, message, args })))
      }
    }
  }

  #redact(line: string) {
    if (this.#token) {
      return line.replaceAll(this.#token, "***")
    } else {
      return line
    }
  }
}