// Copyright 2024 Matthew Rich <matthewrich.conf@gmail.com>. All rights reserved.
package main

import (
  "os"
  "flag"
  "log"
  "log/slog"
_ "fmt"
_ "gopkg.in/yaml.v3"
  "decl/internal/resource"
)


func main() {
  var programLevel = new(slog.LevelVar)
  logger := slog.New(slog.NewTextHandler(os.Stderr, &slog.HandlerOptions{Level: programLevel}))
  slog.SetDefault(logger)
  if debugLogging,ok := os.LookupEnv("DECL_DEBUG"); ok && debugLogging != "" {
    programLevel.Set(slog.LevelDebug)
  } else {
    programLevel.Set(slog.LevelError)
  }

  file := flag.String("resource-file", "", "Resource file path")
  resourceUri := flag.String("import-resource", "", "Add an existing resource")
  
  flag.Parse()

  var resourceFile *os.File
  var inputFileErr error

  if *file != "" {
    resourceFile,inputFileErr = os.Open(*file)
  } else {
    if stdinInfo, stdinErr := os.Stdin.Stat(); stdinErr == nil {
      if (stdinInfo.Mode() & os.ModeCharDevice) == 0 {
        resourceFile = os.Stdin
      }
    } else {
      return
    }
  }

  if inputFileErr != nil {
    log.Fatal(inputFileErr)
  }
  
  d := resource.NewDocument()
  if e := d.Load(resourceFile); e != nil {
    log.Fatal(e)
  }
  if applyErr := d.Apply(); applyErr != nil {
    log.Fatal(applyErr)
  }
  
  if *resourceUri != "" {
    d.AddResource(*resourceUri)
  }

  d.Generate(os.Stdout)
}