import path from "node:path"
import fs from "node:fs"

import { Command, Option } from "clipanion"
import * as typanion from "typanion"
import chalk from "chalk"

import { isExistingPath } from "../../utils/isExistingPath.js"
import { template } from "../../services/Template.js"
import { Solution } from "../../services/Solution.js"
import { TemporaryFolder } from "../../services/TemporaryFolder.js"

export class RunSolutionCommand extends Command {
  public static override paths = [["run", "solution"]]

  public static override usage = {
    description: "Run the solution with the given `input.txt` file.",
  }

  public programmingLanguage = Option.String("--language", {
    description: "The programming language used to solve the challenge.",
    required: true,
    validator: typanion.isString(),
  })

  public challenge = Option.String("--challenge", {
    description: "The challenge name where you want to run your solution.",
    required: true,
    validator: typanion.isString(),
  })

  public solutionName = Option.String("--solution", {
    description: "The solution name to run.",
    required: true,
    validator: typanion.isString(),
  })

  public inputPathUser = Option.String("--input-path", {
    description: "The input file path to use.",
    required: true,
    validator: typanion.isString(),
  })

  public output = Option.Boolean("--output", false, {
    description: "Display the output of the solution.",
  })

  public async execute(): Promise<number> {
    console.log()
    try {
      await TemporaryFolder.cleanAll()
      await template.verifySupportedProgrammingLanguage(
        this.programmingLanguage,
      )
      const solution = await Solution.get({
        name: this.solutionName,
        challengeName: this.challenge,
        programmingLanguageName: this.programmingLanguage,
      })
      const inputPath = path.resolve(process.cwd(), this.inputPathUser)
      if (!(await isExistingPath(inputPath))) {
        throw new Error(`The \`input-path\` doesn't exist: ${inputPath}.`)
      }
      const input = await fs.promises.readFile(inputPath, { encoding: "utf-8" })
      await solution.run(input, this.output)
      await TemporaryFolder.cleanAll()
      return 0
    } catch (error) {
      if (error instanceof Error) {
        console.error(`${chalk.bold.red("Error:")} ${error.message}`)
      }
      await TemporaryFolder.cleanAll()
      return 1
    }
  }
}