package lib

import (
	"bytes"
	"encoding/json"
	"errors"
	"log"
	"net/url"
	"os"
	"strconv"

	"github.com/bigkevmcd/go-configparser"
	"github.com/gofiber/fiber/v2"
)

type Config struct {
  Repos   []Repo  `json:"repos"`
}

var Repos []Repo
type Repo struct {
  Source  string  `json:"source"`
  Branch  string  `json:"branch"`
  Name    string  `json:"name"`
  URL     string  `json:"url"`
}

var Packages []Package
type Package struct {
  Name  string
  Repo  string
  Desc  string
  Size  string 
  Deps  string
  URL   string
  Ver   string
}

func LoadPackgae(repo *configparser.ConfigParser, s string) (Package, error) {
  var (
    pkg Package 
    err error
  ) 
  pkg.Name = s 

  pkg.Ver, err = repo.Get(s, "version")
  if err != nil {
    return pkg, err
  }

  pkg.Desc, err = repo.Get(s, "desc")
  if err != nil {
    return pkg, err
  }

  ssize, err := repo.Get(s, "size")
  if err != nil {
    return pkg, err
  }

  size, err := strconv.Atoi(ssize)
  if err != nil {
    return pkg, err
  }
  pkg.Size = SizeFromBytes(size)

  pkg.Deps, err = repo.Get(s, "depends")
  if err != nil {
    return pkg, err
  }

  return pkg, nil
}

func GetRepo(r Repo) ([]Package, error){
  var pkgs []Package

  furl, err := url.JoinPath(r.URL, r.Name+".tar.gz")
  if err != nil {
    return pkgs, err
  }

  agent := fiber.Get(furl)
  code, body, errs := agent.Bytes()
  if len(errs) > 0 {
    return pkgs, errors.New("Request failed")
  }

  if code != 200 {
    return pkgs, errors.New("Bad response")
  }

  list, err := ExtractFile(body, "pkgs")
  if err != nil {
    return pkgs, err
  }

  repo := configparser.New()
  repo.ParseReader(bytes.NewReader([]byte(list)))
  
  for _, s := range repo.Sections() {
    if s == "DEFAULT" {
      continue
    }

    pkg, err := LoadPackgae(repo, s)
    if err != nil {
      log.Printf("Error loading %s: %s", s, err)
      continue
    }

    pkg.Repo = r.Name
    pkg.URL, err = url.JoinPath(
      r.Source, "src/branch/"+r.Branch+"/src",  pkg.Name, "pkg.sh")
    pkgs = append(pkgs, pkg)
  }
  
  return pkgs, nil
}

func LoadRepos() {
  Repos = []Repo{}

  data, err := os.ReadFile("cfg.json")
  if err != nil {
    log.Printf("Failed to read the configuration")
  }

  var cfg Config
  err = json.Unmarshal(data, &cfg)
  if err != nil {
    log.Printf("Failed to parse the configuration: %s", err)
  }

  Repos = cfg.Repos
}

func LoadAllPkgs() {
  LoadRepos()
  Packages = []Package{}

  for _, r := range Repos {
    pkgs, err := GetRepo(r)
    if err != nil {
      log.Printf("Error loading %s: %s", r.Name, err.Error())
      continue
    }
    Packages = append(Packages, pkgs...)
  }

  log.Printf("Loaded total %d packages", len(Packages))
}