package main

import (
	"fmt"
	"os"
	"regexp"

	"git.oreonproject.org/oreonproject/eternity/common"
	"git.oreonproject.org/oreonproject/eternity/lib"

	"math/big"
	"os/signal"
	"path/filepath"

	"github.com/Masterminds/semver"
	"github.com/sassoftware/go-rpmutils"
)

func main() {
	if len(os.Args) < 2 {
		fmt.Println("Usage: eternity <build/generate/convert/repo/package>")
		os.Exit(1)
	}

	logger := &common.DefaultLogger

	for i, arg := range os.Args {
		if arg == "--help" || arg == "-h" || (i != 1 && arg == "help") {
			logger.LogFunc(lib.Log{
				Level:   "FATAL",
				Content: "To ask for help, use 'eternity help <build/generate/convert/repo/package>, not --help, -h, or eternity <command> help.",
			})
		}
	}
	switch os.Args[1] {
	case "build":
		inMemory := true
		if len(os.Args) > 2 {
			if os.Args[2] == "-d" || os.Args[2] == "--disk" {
				inMemory = false
			}
		}

		privateKey, err, vagueError := common.LoadPrivateKey(logger)
		if err != nil || vagueError != nil {
			common.LoadPrivateKeyHandleError(err, vagueError, logger)
		}

		config, err, vagueError := lib.ParseConfig("eternity.json", logger)
		if err != nil || vagueError != nil {
			common.EternityJsonHandleError(err, vagueError, logger)
		} else {
			var tempDir string
			c := make(chan os.Signal, 1)
			signal.Notify(c, os.Interrupt)
			go func() {
				for sig := range c {
					fmt.Println("\nCaught", sig, "signal, exiting...")
					if tempDir != "" {
						common.BuildEPKRemoveTemporaryDirectory(tempDir, logger)
					}
					os.Exit(1)
				}
			}()
			var size big.Int
			size, tempDir, err, vagueError = lib.BuildEPK("./", inMemory, config.Build, logger)
			if err != nil || vagueError != nil {
				common.BuildEPKHandleError(tempDir, err, vagueError, logger)
			} else {
				filePath := filepath.Join("./", config.Metadata.Name+"-"+config.Metadata.Version.String())
				config.Metadata.DecompressedSize = size
				err, vagueError := lib.PackageEPK(config.Metadata, config.Build, tempDir, filePath+".epk", privateKey, logger)
				if err != nil || vagueError != nil {
					common.PackageEPKHandleError(err, vagueError, logger)
				} else {
					common.BuildEPKRemoveTemporaryDirectory(tempDir, logger)
					logger.LogFunc(lib.Log{
						Level:   "INFO",
						Content: "Successfully built and packaged EPK at " + filePath + ".epk",
					})
				}
			}
		}
	case "repo":
		if len(os.Args) < 4 {
			fmt.Println("Usage: eternity repo <build/generate> <directory>")
			fmt.Println("See 'eternity help repo' for more information.")
			os.Exit(1)
		}
		privateKey, err, vagueError := common.LoadPrivateKey(logger)
		if err != nil || vagueError != nil {
			common.LoadPrivateKeyHandleError(err, vagueError, logger)
		}
		switch os.Args[2] {
		case "generate":
			err, vagueError := lib.GenerateRepository(os.Args[3], privateKey, logger)
			if err != nil || vagueError != nil {
				common.GenerateRepositoryHandleError(err, vagueError, logger)
			}
		}
	case "convert":
		if len(os.Args) < 4 {
			fmt.Println("Usage: eternity convert </path/to/rpm> [</path/to/output/epk>]")
			os.Exit(1)
		}

		privateKey, err, vagueError := common.LoadPrivateKey(logger)
		if err != nil || vagueError != nil {
			common.LoadPrivateKeyHandleError(err, vagueError, logger)
		}

		rpmFile, err := os.Open(os.Args[2])
		if err != nil {
			logger.LogFunc(lib.Log{
				Level:   "FATAL",
				Content: "Error opening RPM: " + err.Error(),
			})
		}

		rpm, err := rpmutils.ReadRpm(rpmFile)
		if err != nil {
			logger.LogFunc(lib.Log{
				Level:   "FATAL",
				Content: "Error reading RPM: " + err.Error(),
			})
		}

		name, err := rpm.Header.GetString(rpmutils.NAME)
		if err != nil {
			logger.LogFunc(lib.Log{
				Level:   "FATAL",
				Content: "Error getting RPM name: " + err.Error(),
			})
		}

		description, err := rpm.Header.GetString(rpmutils.DESCRIPTION)
		if err != nil {
			logger.LogFunc(lib.Log{
				Level:   "FATAL",
				Content: "Error getting RPM description: " + err.Error(),
			})
		}

		longDescription := logger.LogFunc(lib.Log{
			Level:   "INFO",
			Content: "Enter a long description for the package: ",
			Prompt:  true,
		})

		version, err := rpm.Header.GetString(rpmutils.VERSION)
		if err != nil {
			logger.LogFunc(lib.Log{
				Level:   "FATAL",
				Content: "Error getting RPM version: " + err.Error(),
			})
		}

		release, err := rpm.Header.GetString(rpmutils.RELEASE)
		if err != nil {
			logger.LogFunc(lib.Log{
				Level:   "FATAL",
				Content: "Error getting RPM release: " + err.Error(),
			})
		}

		semanticVersion, err := semver.NewVersion(version + "-" + release)
		if err != nil {
			logger.LogFunc(lib.Log{
				Level:   "FATAL",
				Content: "Error parsing RPM version and release: " + err.Error(),
			})
		}

		author := logger.LogFunc(lib.Log{
			Level: "PROMPT",
			Content: "Enter your preferred author name. This must be the same as the author name used in " +
				"eternity.json and associated with your keypair, otherwise it will cause issues with EPK" +
				" verification and your repository will be rejected by Eon and cannot be trusted.",
			Prompt: true,
		})

		license, err := rpm.Header.GetString(rpmutils.LICENSE)
		if err != nil {
			logger.LogFunc(lib.Log{
				Level:   "FATAL",
				Content: "Error getting RPM license: " + err.Error(),
			})
		}

		decompressedSize, err := rpm.Header.GetUint64s(rpmutils.SIZE)
		if err != nil {
			logger.LogFunc(lib.Log{
				Level:   "FATAL",
				Content: "Error getting RPM size: " + err.Error(),
			})
		}

		dependenciesRpm, err := rpm.Header.GetStrings(rpmutils.REQUIRENAME)
		if err != nil {
			logger.LogFunc(lib.Log{
				Level:   "FATAL",
				Content: "Error getting RPM dependencies: " + err.Error(),
			})
		}

		libRegex := regexp.MustCompile(`^([a-z]+)`)
		var dependencies []string

		for _, dependency := range dependenciesRpm {
			dependencyMatch := libRegex.FindStringSubmatch(dependency)
			if len(dependencyMatch) > 1 {
				match := dependencyMatch[1]
				if match != "rpmlib" && match != "rtld" {
					var exists bool
					for _, dep := range dependencies {
						if dep == match {
							exists = true
						}
					}
					if !exists {
						dependencies = append(dependencies, match)
					}
				}
			}
		}

		fmt.Println(dependencies)

		architecture, err := rpm.Header.GetString(rpmutils.ARCH)
		if err != nil {
			logger.LogFunc(lib.Log{
				Level:   "FATAL",
				Content: "Error getting RPM architecture: " + err.Error(),
			})
		}

		metadata := lib.Metadata{
			Name:             name,
			Description:      description,
			LongDescription:  longDescription,
			Version:          *semanticVersion,
			Author:           author,
			License:          license,
			Architecture:     architecture,
			Dependencies:     dependencies,
			DecompressedSize: *big.NewInt(int64(decompressedSize[0])),
			SpecialFiles:     lib.SpecialFiles{},
		}

		// Output the RPM data to a temporary directory
		tempDir, err := os.MkdirTemp("", "eternity-convert-")
		if err != nil {
			logger.LogFunc(lib.Log{
				Level:   "FATAL",
				Content: "Error creating temporary directory: " + err.Error(),
			})
		}

		err = rpm.ExpandPayload(filepath.Join(tempDir, "payload"))
		if err != nil {
			logger.LogFunc(lib.Log{
				Level:   "FATAL",
				Content: "Error expanding RPM payload: " + err.Error(),
			})
		}

		// Package the EPK
		err, vagueError = lib.PackageEPK(metadata, lib.Build{
			TargetRoot: "payload",
			HooksFolder: lib.PotentiallyNullString{
				Null: true,
			},
		}, tempDir, os.Args[3], privateKey, logger)
		if err != nil || vagueError != nil {
			common.PackageEPKHandleError(err, vagueError, logger)
		} else {
			logger.LogFunc(lib.Log{
				Level:   "INFO",
				Content: "Successfully converted RPM to EPK at " + os.Args[3],
			})
		}
	case "help":
		if len(os.Args) > 2 {
			switch os.Args[2] {
			case "build":
				fmt.Println("Usage: eternity build [-d/--disk]")
				fmt.Println("  -d, --disk    Build EPK on disk instead of in memory. This is useful for large EPKs.")
			case "convert":
				fmt.Println("Usage: eternity convert </path/to/rpm> </path/to/output/epk>")
			case "repo":
				fmt.Println("Usage: eternity repo <build/generate> <directory>")
				fmt.Println("  build     Build a repository from a directory containing EPK project directories.")
				fmt.Println("  generate  Generate a repository from a directory containing EPKs.")
			case "package":
				fmt.Println("Usage: eternity package <epk>")
			default:
				fmt.Println("Usage: eternity help <build/generate/convert/repo/package>")
			}
		} else {
			fmt.Println("Usage: eternity help <build/generate/convert/repo/package>")
		}
	}
}