package Package

import (
	"fmt"
	"os"
	"os/exec"

	"PackageManager/Archive"
	"PackageManager/Client/Database"
	"PackageManager/Variables"
)

func runInstallCmd(cmdStrs []string) error {
	var (
		cmd    *exec.Cmd
		cmdStr string
		err    error
	)

	if len(cmdStrs) == 0 {
		return nil
	}

	for _, cmdStr = range cmdStrs {
		cmd = exec.Command("/bin/sh", "-c", cmdStr)
		cmd.Dir = Variables.RootDir
		cmd.Stdin = os.Stdin
		cmd.Stdout = os.Stdout
		cmd.Stderr = os.Stderr
		err = cmd.Run()
		if err != nil {
			return err
		}
	}

	return nil
}

func CheckPackageDependancies(deps map[string]string) ([]int64, error) {
	var (
		name, version string
		depIds        []int64
		id            int64
		e             error
	)

	for name, version = range deps {
		id, e = Database.IsPackageInstalled(name, version)
		if e != nil {
			return depIds, e
		}
		depIds = append(depIds, id)
	}

	return depIds, e
}

func InstallPackage(pkgs []string) error {
	var (
		manifest Manifest
		depIds   []int64
		pkg      string
		mStr     string
		e        error
	)

	for _, pkg = range pkgs {
		_, e = os.Stat(pkg)
		if os.IsNotExist(e) {
			return fmt.Errorf("invalid package %s", pkg)
		}
	}

	for _, pkg = range pkgs {
		fmt.Printf(
			"Installing %s...\n",
			pkg,
		)

		mStr, e = Archive.ExtractManifestFile(pkg)
		if e != nil {
			return e
		}

		manifest, e = ParseManifestFile(mStr)
		if e != nil {
			return e
		}

		if !Variables.IgnoreDepsCheck {
			depIds, e = CheckPackageDependancies(manifest.Dependancies)
			if e != nil {
				return e
			}
		}

		e = runInstallCmd(manifest.PreInstallCmds)
		if e != nil {
			return e
		}

		e = Archive.ExtractArchive(pkg, Variables.RootDir)
		if e != nil {
			return e
		}

		e = runInstallCmd(manifest.PostInstallCmds)
		if e != nil {
			return e
		}

		e = Database.InsertPackage(manifest.Name, manifest.Version, depIds)
		if e != nil {
			return e
		}

		fmt.Printf(
			"%s successfully installed\n",
			pkg,
		)
	}

	return nil
}