package main

import (
	"flag"
	"fmt"
	"os"
	"sort"
	"sync"

	"modify/utils"

	"github.com/go-git/go-git/v5"

	"modify/logger"
)

type GlobalStats struct {
	TotalMatches       int
	TotalModifications int
	ProcessedFiles     int
	FailedFiles        int
}

var (
	repo     *git.Repository
	worktree *git.Worktree
	stats    GlobalStats = GlobalStats{}
)

func main() {
	flag.Usage = func() {
		fmt.Fprintf(os.Stderr, "Usage: %s [options] <pattern> <lua_expression> <...files_or_globs>\n", os.Args[0])
		fmt.Fprintf(os.Stderr, "\nOptions:\n")
		fmt.Fprintf(os.Stderr, "  -git\n")
		fmt.Fprintf(os.Stderr, "        Use git to manage files\n")
		fmt.Fprintf(os.Stderr, "  -reset\n")
		fmt.Fprintf(os.Stderr, "        Reset files to their original state\n")
		fmt.Fprintf(os.Stderr, "  -loglevel string\n")
		fmt.Fprintf(os.Stderr, "        Set logging level: ERROR, WARNING, INFO, DEBUG, TRACE (default \"INFO\")\n")
		fmt.Fprintf(os.Stderr, "\nExamples:\n")
		fmt.Fprintf(os.Stderr, "  Regex mode (default):\n")
		fmt.Fprintf(os.Stderr, "    %s \"<value>(\\d+)</value>\" \"*1.5\" data.xml\n", os.Args[0])
		fmt.Fprintf(os.Stderr, "\nNote: v1, v2, etc. are used to refer to capture groups as numbers.\n")
		fmt.Fprintf(os.Stderr, "      s1, s2, etc. are used to refer to capture groups as strings.\n")
		fmt.Fprintf(os.Stderr, "      Helper functions: num(str) converts string to number, str(num) converts number to string\n")
		fmt.Fprintf(os.Stderr, "      is_number(str) checks if a string is numeric\n")
		fmt.Fprintf(os.Stderr, "      If expression starts with an operator like *, /, +, -, =, etc., v1 is automatically prepended\n")
		fmt.Fprintf(os.Stderr, "      You can use any valid Lua code, including if statements, loops, etc.\n")
		fmt.Fprintf(os.Stderr, "      Glob patterns are supported for file selection (*.xml, data/**.xml, etc.)\n")
	}
	flag.Parse()
	args := flag.Args()

	level := logger.ParseLevel(*utils.LogLevel)
	logger.Init(level)
	logger.Info("Initializing with log level: %s", level.String())

	// The plan is:
	// Load all commands
	commands, err := utils.LoadCommands(args)
	if err != nil {
		logger.Error("Failed to load commands: %v", err)
		flag.Usage()
		return
	}

	// Then aggregate all the globs and deduplicate them
	globs := utils.AggregateGlobs(commands)

	// Resolve all the files for all the globs
	logger.Info("Found %d unique file patterns", len(globs))
	files, err := utils.ExpandGLobs(globs)
	if err != nil {
		logger.Error("Failed to expand file patterns: %v", err)
		return
	}
	logger.Info("Found %d files to process", len(files))

	// Somehow connect files to commands via globs..
	// For each file check every glob of every command
	// Maybe memoize this part
	// That way we know what commands affect what files
	associations, err := utils.AssociateFilesWithCommands(files, commands)
	if err != nil {
		logger.Error("Failed to associate files with commands: %v", err)
		return
	}

	// TODO: Utilize parallel workers for this
	// Then for each file run all commands associated with the file
	workers := make(chan struct{}, *utils.ParallelFiles)
	wg := sync.WaitGroup{}
	for file, commands := range associations {
		workers <- struct{}{}
		wg.Add(1)
		go func(file string, commands []utils.ModifyCommand) {
			defer func() { <-workers }()
			defer wg.Done()

			fileData, err := os.ReadFile(file)
			if err != nil {
				logger.Error("Failed to read file %q: %v", file, err)
				return
			}
			logger.Trace("Loaded %d bytes of data for file %q", len(fileData), file)
			fileDataStr := string(fileData)

			// Aggregate all the modifications and execute them
			modifications := []utils.ReplaceCommand{}
			for _, command := range commands {
				logger.Info("Processing file %q with command %q", file, command.Pattern)
				// TODO: Run processor and return modifications
			}

			// Sort commands in reverse order for safe replacements
			sort.Slice(modifications, func(i, j int) bool {
				return modifications[i].From > modifications[j].From
			})
			logger.Trace("Applying %d replacement commands in reverse order", len(modifications))

			fileDataStr, count := utils.ExecuteModifications(modifications, fileDataStr)
			logger.Info("Executed %d modifications for file %q", count, file)

			err = os.WriteFile(file, []byte(fileDataStr), 0644)
			if err != nil {
				logger.Error("Failed to write file %q: %v", file, err)
				return
			}
		}(file, commands)
	}

	// This will also relieve processor of some of the file loading
	// But we will also have to rework the tests.......
	// Also give each command its own logger, maybe prefix it with something... Maybe give commands a name?
	// Do that with logger.WithField("loglevel", level.String())
	// Since each command also has its own log level
	// TODO: Maybe even figure out how to run individual commands...?
	// TODO: What to do with git? Figure it out ....

	// if *gitFlag {
	// 	logger.Info("Git integration enabled, setting up git repository")
	// 	err := setupGit()
	// 	if err != nil {
	// 		logger.Error("Failed to setup git: %v", err)
	// 		fmt.Fprintf(os.Stderr, "Error setting up git: %v\n", err)
	// 		return
	// 	}
	// }

	// logger.Debug("Expanding file patterns")
	// files, err := expandFilePatterns(filePatterns)
	// if err != nil {
	// 	logger.Error("Failed to expand file patterns: %v", err)
	// 	fmt.Fprintf(os.Stderr, "Error expanding file patterns: %v\n", err)
	// 	return
	// }

	// if len(files) == 0 {
	// 	logger.Warning("No files found matching the specified patterns")
	// 	fmt.Fprintf(os.Stderr, "No files found matching the specified patterns\n")
	// 	return
	// }

	// if *gitFlag {
	// 	logger.Info("Cleaning up git files before processing")
	// 	err := cleanupGitFiles(files)
	// 	if err != nil {
	// 		logger.Error("Failed to cleanup git files: %v", err)
	// 		fmt.Fprintf(os.Stderr, "Error cleaning up git files: %v\n", err)
	// 		return
	// 	}
	// }
	// if *resetFlag {
	// 	logger.Info("Files reset to their original state, nothing more to do")
	// 	log.Printf("Files reset to their original state, nothing more to do")
	// 	return
	// }

	// Process each file
	// for _, file := range files {
	// 	wg.Add(1)
	// 	logger.SafeGoWithArgs(func(args ...interface{}) {
	// 		defer wg.Done()
	// 		fileToProcess := args[0].(string)
	// 		logger.Debug("Processing file: %s", fileToProcess)

	// 		// It's a bit fucked, maybe I could do better to call it from proc... But it'll do for now
	// 		modCount, matchCount, err := processor.Process(proc, fileToProcess, pattern, luaExpr)
	// 		if err != nil {
	// 			logger.Error("Failed to process file %s: %v", fileToProcess, err)
	// 			fmt.Fprintf(os.Stderr, "Failed to process file %s: %v\n", fileToProcess, err)
	// 			stats.FailedFiles++
	// 		} else {
	// 			if modCount > 0 {
	// 				logger.Info("Successfully processed file %s: %d modifications from %d matches",
	// 					fileToProcess, modCount, matchCount)
	// 			} else if matchCount > 0 {
	// 				logger.Info("Found %d matches in file %s but made no modifications",
	// 					matchCount, fileToProcess)
	// 			} else {
	// 				logger.Debug("No matches found in file: %s", fileToProcess)
	// 			}
	// 			stats.ProcessedFiles++
	// 			stats.TotalMatches += matchCount
	// 			stats.TotalModifications += modCount
	// 		}
	// 	}, file)
	// }
	// wg.Wait()

	// Print summary
	if stats.TotalModifications == 0 {
		logger.Warning("No modifications were made in any files")
		fmt.Fprintf(os.Stderr, "No modifications were made in any files\n")
	} else {
		logger.Info("Operation complete! Modified %d values in %d/%d files",
			stats.TotalModifications, stats.ProcessedFiles, stats.ProcessedFiles+stats.FailedFiles)
		fmt.Printf("Operation complete! Modified %d values in %d/%d files\n",
			stats.TotalModifications, stats.ProcessedFiles, stats.ProcessedFiles+stats.FailedFiles)
	}
}