package main

import (
	"eon/common"
	"eon/lib"

	"bufio"
	"bytes"
	"fmt"
	"io"
	"os"
	"regexp"
	"strings"

	"golang.org/x/term"

	"github.com/dustin/go-humanize"
	"github.com/fatih/color"
)

var logger = &common.DefaultLogger

func main() {
	if len(os.Args) < 2 {
		fmt.Println("Usage: eon <list/info/install/remove/clean/repo/help> [args]")
		os.Exit(1)
	}

	switch os.Args[1] {
	case "help":
		if len(os.Args) < 3 {
			fmt.Println("Usage: eon help (list/info/install/remove/clean/repo/help) [args]")
			os.Exit(1)
		} else {
			switch os.Args[2] {
			case "list":
				fmt.Println("Usage: eon list (remote/local)")
				fmt.Println("- remote: lists packages available in the repositories.")
				fmt.Println("- local: lists installed packages.")
			case "info":
				fmt.Println("Usage: eon info <package>")
				fmt.Println("Shows information about a package.")
			case "install":
				fmt.Println("Usage: eon install <package> [<repository>]")
				fmt.Println("Installs a package.")
			case "remove":
				fmt.Println("Usage: eon remove <package>")
				fmt.Println("Removes a package.")
			case "clean":
				fmt.Println("Usage: eon clean")
				fmt.Println("Removes unused dependencies.")
			case "repo":
				fmt.Println("Usage: eon repo (add/remove/list)")
				fmt.Println("- add <url>: adds a repository.")
				fmt.Println("- remove <url>: removes a repository.")
				fmt.Println("- list: lists repositories.")
			case "help":
				fmt.Println("Usage: eon help (list/info/install/remove/clean/repo/help) [args]")
				fmt.Println("Shows help.")
			default:
				fmt.Println(color.RedString("Unknown command: " + os.Args[2]))
				os.Exit(1)
			}
		}
	case "install":
		var forceMode bool
		var inMemoryMode bool
		if len(os.Args) < 3 {
			fmt.Println("Usage: eon install <package>")
			os.Exit(1)
		}
		var localPackageList []string
		fileInfos := make(map[string]os.FileInfo)
		var repoPackageList []string
		for _, pkg := range os.Args[2:] {
			if !strings.HasPrefix(pkg, "-") {
				fileInfo, err := os.Stat(pkg)
				if err != nil {
					if os.IsNotExist(err) {
						// This unholy regex is a package name validator. It validates repository-name/package-name/1.0.0-prerelease.1+meta.1
						// The regex is so unholy it breaks JetBrains' regex parser, so I had to disable it.
						//goland:noinspection RegExpUnnecessaryNonCapturingGroup
						match, err := regexp.Match(`^(?:([a-z0-9_-]+)/)?([a-z0-9_-]+)(?:/(0|[1-9]\d*)\.(0|[1-9]\d*)\.(0|[1-9]\d*)(?:-((?:0|[1-9]\d*|\d*[a-zA-Z-][0-9a-zA-Z-]*)(?:\.(?:0|[1-9]\d*|\d*[a-zA-Z-][0-9a-zA-Z-]*))*))?(?:\+([0-9a-zA-Z-]+(?:\.[0-9a-zA-Z-]+)*))?)$`, []byte(pkg))
						if err != nil {
							fmt.Println(color.RedString("Failed to validate package name: " + err.Error()))
							os.Exit(1)
						}
						if !match {
							fmt.Println(color.RedString("Invalid package name: " + pkg))
							os.Exit(1)
						} else {
							repoPackageList = append(repoPackageList, pkg)
						}
					}
				} else {
					localPackageList = append(localPackageList, pkg)
					fileInfos[pkg] = fileInfo
				}
			} else {
				switch pkg {
				case "--force", "-f":
					forceMode = true
				case "--optimizeForSpeed", "-O":
					inMemoryMode = true
				}
			}
		}
		// We contact the database before we print anything as to not break the formatting.
		err := common.EstablishDBConnection(logger)
		if err != nil {
			fmt.Println(color.RedString("Failed to establish a connection to the database: " + err.Error()))
			os.Exit(1)
		}
		// Ok. Let's give the user an overview of what we're going to do.
		if len(localPackageList) > 0 || len(repoPackageList) > 0 {
			fmt.Println("The following packages will be installed:")
			width, _, err := term.GetSize(int(os.Stdout.Fd()))
			if err != nil {
				fmt.Println(color.RedString("Failed to get terminal width: " + err.Error()))
				os.Exit(1)
			}
			if width < 42 {
				fmt.Println(color.RedString("Terminal too small. Minimum required width: 42 characters."))
				os.Exit(1)
			}
			for range width {
				fmt.Print("=")
			}
			fmt.Print("\n ")
			tableList := []string{"Package", "Architecture", "Version", "Repository", "Size", "Action"}
			maxSize := (width - 6) / 6
			for _, item := range tableList {
				common.PrintWithEvenPadding(item, maxSize)
			}
			fmt.Print("\n")
			for range width {
				fmt.Print("=")
			}
			fmt.Print("\n")
			var epkListLocal []common.InstallPackage
			for _, pkg := range localPackageList {
				var finalisedList []string
				epkFile, err := os.Open(pkg)
				if err != nil {
					fmt.Println(color.RedString("Failed to open package: " + err.Error()))
					os.Exit(1)
				}

				var displayData lib.EPKPreMap
				var vagueErr error
				var epkBytes bytes.Buffer
				if !inMemoryMode {
					displayData, err, vagueErr = lib.PreMapEPK(lib.StreamOrBytes{Stream: epkFile, IsStream: true}, fileInfos[pkg].Size())
				} else {
					_, err = io.Copy(bufio.NewWriter(&epkBytes), epkFile)
					if err != nil {
						fmt.Println(color.RedString("Failed to read package into memory: " + err.Error() +
							", have you tried disabling in-memory mode?"))
						os.Exit(1)
					}
					err := epkFile.Close()
					if err != nil {
						fmt.Println(color.HiYellowString("Failed to close package file: " + err.Error() + ", memory leak possible."))
					}
					displayData, err, vagueErr = lib.PreMapEPK(lib.StreamOrBytes{Bytes: epkBytes.Bytes(), IsStream: false}, fileInfos[pkg].Size())
				}
				if err != nil || vagueErr != nil {
					common.PreMapEPKHandleError(err, vagueErr, logger)
					os.Exit(1)
				}

				version, exists, err := common.DefaultCheckEPKInDB(displayData.Name)
				if err != nil {
					fmt.Println(color.RedString("Failed to check for package in database: " + err.Error()))
				}

				// TODO: Implement some dependency management more-or-less here.

				name := displayData.Name
				architecture := displayData.Architecture
				versionDisplay := displayData.Version.String()
				repository := "Local file"
				size := humanize.Bytes(uint64(displayData.Size))
				action := "Install"
				if exists {
					if version.Compare(&displayData.Version) != -1 {
						if !forceMode {
							name = color.GreenString(name)
							architecture = color.GreenString(architecture)
							versionDisplay = color.GreenString(versionDisplay)
							repository = color.GreenString(repository)
							size = color.GreenString(size)
							action = color.GreenString("Skip")
						} else {
							action = "Forced installation"
							displayData.IsUpgrade = true
							if !inMemoryMode {
								epkListLocal = append(epkListLocal, common.InstallPackage{
									StreamOrBytes: lib.StreamOrBytes{
										Stream:   epkFile,
										IsStream: true,
									},
									EPKPreMap: &displayData,
									LocalFile: true,
								})
							} else {
								epkListLocal = append(epkListLocal, common.InstallPackage{
									StreamOrBytes: lib.StreamOrBytes{
										Bytes:    epkBytes.Bytes(),
										IsStream: false,
									},
									EPKPreMap: &displayData,
									LocalFile: true,
								})
							}
						}
					} else {
						action = "Upgrade"
						displayData.IsUpgrade = true
						if !inMemoryMode {
							epkListLocal = append(epkListLocal, common.InstallPackage{
								StreamOrBytes: lib.StreamOrBytes{
									Stream:   epkFile,
									IsStream: true,
								},
								EPKPreMap: &displayData,
								LocalFile: true,
							})
						} else {
							epkListLocal = append(epkListLocal, common.InstallPackage{
								StreamOrBytes: lib.StreamOrBytes{
									Bytes:    epkBytes.Bytes(),
									IsStream: false,
								},
								EPKPreMap: &displayData,
								LocalFile: true,
							})
						}
					}
				} else {
					displayData.IsUpgrade = false
					if !inMemoryMode {
						epkListLocal = append(epkListLocal, common.InstallPackage{
							StreamOrBytes: lib.StreamOrBytes{
								Stream:   epkFile,
								IsStream: true,
							},
							EPKPreMap: &displayData,
							LocalFile: true,
						})
					} else {
						epkListLocal = append(epkListLocal, common.InstallPackage{
							StreamOrBytes: lib.StreamOrBytes{
								Bytes:    epkBytes.Bytes(),
								IsStream: false,
							},
							EPKPreMap: &displayData,
							LocalFile: true,
						})
					}
				}

				finalisedList = append(finalisedList, name)
				finalisedList = append(finalisedList, architecture)
				finalisedList = append(finalisedList, versionDisplay)
				finalisedList = append(finalisedList, repository)
				finalisedList = append(finalisedList, size)
				finalisedList = append(finalisedList, action)
				fmt.Print(" ")
				for _, item := range finalisedList {
					common.PrintWithEvenPadding(item, maxSize)
				}
				fmt.Print("\n")
			}
			//for _, pkg := range repoPackageList {
			//	var finalisedList []string
			//	lib.SearchRepository()
			//}
			for range width {
				fmt.Print("=")
			}
			fmt.Print("\n")
			if len(epkListLocal) > 0 {
				response := logger.LogFunc(lib.Log{
					Level:     "INFO",
					Content:   "Proceed with installation (y/n)?",
					Prompt:    true,
					PlaySound: true,
				})
				if strings.ToLower(response) == "y" {
					// We hide the cursor because it makes the progress bar look weird and other package managers hide
					// it during installation. For some reason, it builds suspense. Or it does with me anyway, when
					// a program hides the cursor, it makes me think twice than to Ctrl+C it :P
					// - Arzumify
					fmt.Print("\033[?25l")
					// Time to install things.
					for _, streamOrBytesAndPreMap := range epkListLocal {
						metadata, err, vagueErr := lib.FullyMapMetadata(streamOrBytesAndPreMap.StreamOrBytes,
							streamOrBytesAndPreMap.EPKPreMap, common.DefaultGetFingerprintFromDB,
							common.DefaultAddFingerprintToDB, logger)
						if err != nil || vagueErr != nil {
							common.FullyMapMetadataHandleError(err, vagueErr, logger)
						}
						// Install the package.
						tempDir, err, vagueErr := lib.InstallEPK(streamOrBytesAndPreMap.StreamOrBytes,
							metadata, streamOrBytesAndPreMap.EPKPreMap, common.DefaultAddEPKToDB, logger)
						if err != nil || vagueErr != nil {
							common.InstallEPKHandleError(tempDir, err, vagueErr, logger)
						}
						// Done!
						fmt.Println("Installed package: " + streamOrBytesAndPreMap.EPKPreMap.Name)
					}
					// We show the cursor again because we're done with the progress bar.
					// We show the cursor again because we're done with the progress bar.
					fmt.Print("\033[?25h")
				} else {
					fmt.Println("Installation cancelled.")
					os.Exit(1)
				}
			} else {
				fmt.Println("No packages left to install. To force re-install / downgrade, use the --force flag, " +
					"though this may result in breakage.")
				os.Exit(0)
			}
		} else {
			fmt.Println("No packages to install.")
			os.Exit(0)
		}
	case "repo":
		if len(os.Args) < 3 {
			fmt.Println("Usage: eon repo (add/remove/list)")
			os.Exit(1)
		}

		switch os.Args[2] {
		case "add":
			if len(os.Args) < 4 {
				fmt.Println("Usage: eon repo add <url>")
				os.Exit(1)
			} else {
				err := common.EstablishDBConnection(logger)
				if err != nil {
					fmt.Println(color.RedString("Failed to establish a connection to the database: " + err.Error()))
					os.Exit(1)
				}
				err, vagueErr := lib.AddRepository(os.Args[3], common.DefaultAddRepositoryToDB, common.DefaultGetFingerprintFromDB, common.DefaultAddFingerprintToDB, common.DefaultAddRemotePackageToDB, logger)
				if err != nil || vagueErr != nil {
					common.AddRepositoryHandleError(err, vagueErr, logger)
				}
			}
		case "remove":
			if len(os.Args) < 4 {
				fmt.Println("Usage: eon repo remove <name>")
				os.Exit(1)
			} else {
				err := common.EstablishDBConnection(logger)
				if err != nil {
					fmt.Println(color.RedString("Failed to establish a connection to the database: " + err.Error()))
					os.Exit(1)
				}
				err, vagueErr := lib.RemoveRepository(os.Args[3], common.DefaultRemoveRepositoryFromDB, logger)
				if err != nil || vagueErr != nil {
					common.RemoveRepositoryHandleError(err, vagueErr, logger)
				}
			}
		case "list":
			err := common.EstablishDBConnection(logger)
			if err != nil {
				fmt.Println(color.RedString("Failed to establish a connection to the database: " + err.Error()))
				os.Exit(1)
			}
			repos, err := common.DefaultListRepositoriesInDB()
			if err != nil {
				fmt.Println(color.RedString("Failed to get repositories: " + err.Error()))
				os.Exit(1)
			}
			if len(repos) == 0 {
				fmt.Println("No repositories.")
			} else {
				fmt.Println("Repositories:")
				for _, repo := range repos {
					fmt.Println("\n" + repo.Name + ":\n" + "  URL: " + repo.URL + "\n  Owner: " + repo.Owner)
				}
				fmt.Println()
			}
		}
	default:
		fmt.Println(color.RedString("Unknown or unimplemented command: " + os.Args[1]))
		os.Exit(1)
	}
}