package main

import (
	"flag"
	"os"
	"os/exec"
	"path"
	"path/filepath"
	"strings"
	"time"

	logger "git.site.quack-lab.dev/dave/cylogger"
)

var ROOT string

// executeGitCommand runs a git command in the ROOT directory and returns the output
func executeGitCommand(args ...string) (string, error) {
	cmd := exec.Command("git", args...)
	cmd.Dir = ROOT
	output, err := cmd.CombinedOutput()
	if err != nil {
		logger.Error("Git command failed: %s", string(output))
		return "", err
	}
	return strings.TrimSpace(string(output)), nil
}

// isGitRepository checks if the current directory is a git repository
func isGitRepository() bool {
	_, err := executeGitCommand("rev-parse", "--git-dir")
	return err == nil
}

func main() {
	scanIntervalF := flag.String("interval", "2s", "scan interval")
	flag.Parse()

	scanInterval, err := time.ParseDuration(*scanIntervalF)
	if err != nil {
		logger.Error("error parsing SCAN_INTERVAL: %v", err)
		return
	}

	cwd, err := os.Getwd()
	if err != nil {
		logger.Error("error getting cwd: %v", err)
		return
	}

	ROOT = path.Clean(cwd)
	ROOT, err = filepath.Abs(ROOT)
	if err != nil {
		logger.Error("error getting absolute path for ROOT: %v", err)
		return
	}

	logger.Info("Input args parsed as:")
	logger.Info("ROOT: %s", ROOT)
	logger.Info("SCAN_INTERVAL: %.0fs", scanInterval.Seconds())

	for {
		logger.Info("Running at %s", time.Now().Format(time.RFC3339))
		doRun()
		time.Sleep(scanInterval)
	}
}

func doRun() {
	// Check if repository exists
	if !isGitRepository() {
		// Initialize a new repository
		_, err := executeGitCommand("init")
		if err != nil {
			logger.Error("Error creating repository: %v", err)
			return
		}
		logger.Info("New repository created at: %s", ROOT)

		// Create .gitignore file
		gitignorePath := filepath.Join(ROOT, ".gitignore")
		if err := os.WriteFile(gitignorePath, []byte("*.log\n"), 0644); err != nil {
			logger.Error("Error creating .gitignore: %v", err)
			return
		}

		// Set identity
		if err := setIdentity(); err != nil {
			logger.Error("Error setting identity: %v", err)
			return
		}

		// Add .gitignore
		if _, err := executeGitCommand("add", ".gitignore"); err != nil {
			logger.Error("Error adding .gitignore: %v", err)
			return
		}

		// Create initial commit
		if _, err := executeGitCommand("commit", "-m", "Initial commit"); err != nil {
			logger.Error("Error creating initial commit: %v", err)
			return
		}

		logger.Info("Initial commit created with .gitignore")
		return
	}

	// Check status
	statusOutput, err := executeGitCommand("status", "--porcelain")
	if err != nil {
		logger.Error("Error getting status: %v", err)
		return
	}

	if statusOutput == "" {
		logger.Info("Nothing to commit")
		return
	}

	// Count changes by type
	lines := strings.Split(statusOutput, "\n")
	var added, modified, deleted int
	for _, line := range lines {
		if len(line) >= 2 {
			status := line[:2]
			if strings.Contains(status, "A") {
				added++
			}
			if strings.Contains(status, "M") {
				modified++
			}
			if strings.Contains(status, "D") {
				deleted++
			}
		}
	}

	logger.Info("Changes detected: %d added, %d modified, %d deleted", added, modified, deleted)

	// Add all changes
	_, err = executeGitCommand("add", ".")
	if err != nil {
		logger.Error("Error adding changes: %v", err)
		return
	}
	logger.Info("Changes added to index")

	// Set identity
	if err := setIdentity(); err != nil {
		logger.Error("Error setting identity: %v", err)
		return
	}

	// Get current branch
	branch, err := executeGitCommand("branch", "--show-current")
	if err != nil {
		logger.Error("Error getting current branch: %v", err)
		return
	}

	// Commit changes
	commitHash, err := executeGitCommand("commit", "-m", "Update")
	if err != nil {
		logger.Error("Error committing changes: %v", err)
		return
	}

	// Get commit details
	authorName, _ := executeGitCommand("log", "-1", "--format=%an", commitHash)
	authorEmail, _ := executeGitCommand("log", "-1", "--format=%ae", commitHash)
	commitDate, _ := executeGitCommand("log", "-1", "--format=%ai", commitHash)
	commitMessage, _ := executeGitCommand("log", "-1", "--format=%s", commitHash)

	logger.Info("Changes committed successfully:")
	logger.Info("  Branch: %s", branch)
	logger.Info("  Commit: %s", commitHash)
	logger.Info("  Author: %s <%s>", authorName, authorEmail)
	logger.Info("  Date: %s", commitDate)
	logger.Info("  Message: %s", commitMessage)
}

func setIdentity() error {
	_, err := executeGitCommand("config", "user.name", "system")
	if err != nil {
		return err
	}

	_, err = executeGitCommand("config", "user.email", "system@localhost")
	return err
}