package utils

import (
	"fmt"
	"os"
	"path/filepath"
	"strings"

	logger "git.site.quack-lab.dev/dave/cylogger"
	"github.com/bmatcuk/doublestar/v4"
	"gopkg.in/yaml.v3"
)

// modifyCommandLogger is a scoped logger for the utils/modifycommand package.
var modifyCommandLogger = logger.Default.WithPrefix("utils/modifycommand")

type ModifyCommand struct {
	Name      string                 `yaml:"name,omitempty"`
	Regex     string                 `yaml:"regex,omitempty"`
	Regexes   []string               `yaml:"regexes,omitempty"`
	Lua       string                 `yaml:"lua,omitempty"`
	Files     []string               `yaml:"files,omitempty"`
	Reset     bool                   `yaml:"reset,omitempty"`
	LogLevel  string                 `yaml:"loglevel,omitempty"`
	Isolate   bool                   `yaml:"isolate,omitempty"`
	NoDedup   bool                   `yaml:"nodedup,omitempty"`
	Disabled  bool                   `yaml:"disable,omitempty"`
	Modifiers map[string]interface{} `yaml:"modifiers,omitempty"`
}

type CookFile []ModifyCommand

func (c *ModifyCommand) Validate() error {
	validateLogger := modifyCommandLogger.WithPrefix("Validate").WithField("commandName", c.Name)
	validateLogger.Debug("Validating command")
	if c.Regex == "" && len(c.Regexes) == 0 {
		validateLogger.Error("Validation failed: Regex pattern is required")
		return fmt.Errorf("pattern is required")
	}
	if c.Lua == "" {
		validateLogger.Error("Validation failed: Lua expression is required")
		return fmt.Errorf("lua expression is required")
	}
	if len(c.Files) == 0 {
		validateLogger.Error("Validation failed: At least one file is required")
		return fmt.Errorf("at least one file is required")
	}
	if c.LogLevel == "" {
		validateLogger.Debug("LogLevel not specified, defaulting to INFO")
		c.LogLevel = "INFO"
	}
	validateLogger.Debug("Command validated successfully")
	return nil
}

// Ehh.. Not much better... Guess this wasn't the big deal
var matchesMemoTable map[string]bool = make(map[string]bool)

func Matches(path string, glob string) (bool, error) {
	matchesLogger := modifyCommandLogger.WithPrefix("Matches").WithField("path", path).WithField("glob", glob)
	matchesLogger.Debug("Checking if path matches glob")
	key := fmt.Sprintf("%s:%s", path, glob)
	if matches, ok := matchesMemoTable[key]; ok {
		matchesLogger.Debug("Found match in memo table: %t", matches)
		return matches, nil
	}
	matches, err := doublestar.Match(glob, path)
	if err != nil {
		matchesLogger.Error("Failed to match glob: %v", err)
		return false, fmt.Errorf("failed to match glob %s with file %s: %w", glob, path, err)
	}
	matchesMemoTable[key] = matches
	matchesLogger.Debug("Match result: %t, storing in memo table", matches)
	return matches, nil
}

func SplitPattern(pattern string) (string, string) {
	splitPatternLogger := modifyCommandLogger.WithPrefix("SplitPattern").WithField("pattern", pattern)
	splitPatternLogger.Debug("Splitting pattern")
	splitPatternLogger.Trace("Original pattern: %q", pattern)
	static, pattern := doublestar.SplitPattern(pattern)

	cwd, err := os.Getwd()
	if err != nil {
		splitPatternLogger.Error("Error getting current working directory: %v", err)
		return "", ""
	}
	splitPatternLogger.Trace("Current working directory: %q", cwd)
	if static == "" {
		splitPatternLogger.Debug("Static part is empty, defaulting to current working directory")
		static = cwd
	}
	if !filepath.IsAbs(static) {
		splitPatternLogger.Debug("Static part is not absolute, joining with current working directory")
		static = filepath.Join(cwd, static)
		static = filepath.Clean(static)
		splitPatternLogger.Trace("Static path after joining and cleaning: %q", static)
	}
	static = strings.ReplaceAll(static, "\\", "/")
	splitPatternLogger.Trace("Final static path: %q, Remaining pattern: %q", static, pattern)
	return static, pattern
}

type FileCommandAssociation struct {
	File            string
	IsolateCommands []ModifyCommand
	Commands        []ModifyCommand
}

func AssociateFilesWithCommands(files []string, commands []ModifyCommand) (map[string]FileCommandAssociation, error) {
	associateFilesLogger := modifyCommandLogger.WithPrefix("AssociateFilesWithCommands")
	associateFilesLogger.Debug("Associating files with commands")
	associateFilesLogger.Trace("Input files: %v", files)
	associateFilesLogger.Trace("Input commands: %v", commands)
	associationCount := 0
	fileCommands := make(map[string]FileCommandAssociation)

	for _, file := range files {
		file = strings.ReplaceAll(file, "\\", "/")
		associateFilesLogger.Debug("Processing file: %q", file)
		fileCommands[file] = FileCommandAssociation{
			File:            file,
			IsolateCommands: []ModifyCommand{},
			Commands:        []ModifyCommand{},
		}
		for _, command := range commands {
			associateFilesLogger.Debug("Checking command %q for file %q", command.Name, file)
			for _, glob := range command.Files {
				glob = strings.ReplaceAll(glob, "\\", "/")
				static, pattern := SplitPattern(glob)
				associateFilesLogger.Trace("Glob parts for %q → static=%q pattern=%q", glob, static, pattern)

				// Build absolute path for the current file to compare with static
				cwd, err := os.Getwd()
				if err != nil {
					associateFilesLogger.Warning("Failed to get CWD when matching %q for file %q: %v", glob, file, err)
					continue
				}
				var absFile string
				if filepath.IsAbs(file) {
					absFile = filepath.Clean(file)
				} else {
					absFile = filepath.Clean(filepath.Join(cwd, file))
				}
				absFile = strings.ReplaceAll(absFile, "\\", "/")
				associateFilesLogger.Trace("Absolute file path resolved for matching: %q", absFile)

				// Only match if the file is under the static root
				if !(strings.HasPrefix(absFile, static+"/") || absFile == static) {
					associateFilesLogger.Trace("Skipping glob %q for file %q because file is outside static root %q", glob, file, static)
					continue
				}

				patternFile := strings.TrimPrefix(absFile, static+`/`)
				associateFilesLogger.Trace("Pattern-relative path used for match: %q", patternFile)
				matches, err := Matches(patternFile, pattern)
				if err != nil {
					associateFilesLogger.Warning("Failed to match glob %q with file %q: %v", glob, file, err)
					continue
				}
				if matches {
					associateFilesLogger.Debug("File %q matches glob %q. Associating with command %q", file, glob, command.Name)
					association := fileCommands[file]

					if command.Isolate {
						associateFilesLogger.Debug("Command %q is an isolate command, adding to isolate list", command.Name)
						association.IsolateCommands = append(association.IsolateCommands, command)
					} else {
						associateFilesLogger.Debug("Command %q is a regular command, adding to regular list", command.Name)
						association.Commands = append(association.Commands, command)
					}
					fileCommands[file] = association
					associationCount++
				} else {
					associateFilesLogger.Trace("File %q did not match glob %q (pattern=%q, rel=%q)", file, glob, pattern, patternFile)
				}
			}
		}
		currentFileCommands := fileCommands[file]
		associateFilesLogger.Debug("Finished processing file %q. Found %d regular commands and %d isolate commands", file, len(currentFileCommands.Commands), len(currentFileCommands.IsolateCommands))
		associateFilesLogger.Trace("Commands for file %q: %v", file, currentFileCommands.Commands)
		associateFilesLogger.Trace("Isolate commands for file %q: %v", file, currentFileCommands.IsolateCommands)
	}
	associateFilesLogger.Info("Completed association. Found %d total associations for %d files and %d commands", associationCount, len(files), len(commands))
	return fileCommands, nil
}

func AggregateGlobs(commands []ModifyCommand) map[string]struct{} {
	aggregateGlobsLogger := modifyCommandLogger.WithPrefix("AggregateGlobs")
	aggregateGlobsLogger.Debug("Aggregating glob patterns from commands")
	aggregateGlobsLogger.Trace("Input commands for aggregation: %v", commands)
	globs := make(map[string]struct{})
	for _, command := range commands {
		aggregateGlobsLogger.Debug("Processing command %q for glob patterns", command.Name)
		for _, glob := range command.Files {
			resolvedGlob := strings.Replace(glob, "~", os.Getenv("HOME"), 1)
			resolvedGlob = strings.ReplaceAll(resolvedGlob, "\\", "/")
			aggregateGlobsLogger.Trace("Adding glob: %q (resolved to %q)", glob, resolvedGlob)
			globs[resolvedGlob] = struct{}{}
		}
	}
	aggregateGlobsLogger.Debug("Finished aggregating globs. Found %d unique glob patterns", len(globs))
	aggregateGlobsLogger.Trace("Aggregated unique globs: %v", globs)
	return globs
}

func ExpandGLobs(patterns map[string]struct{}) ([]string, error) {
	expandGlobsLogger := modifyCommandLogger.WithPrefix("ExpandGLobs")
	expandGlobsLogger.Debug("Expanding glob patterns to actual files")
	expandGlobsLogger.Trace("Input patterns for expansion: %v", patterns)
	var files []string
	filesMap := make(map[string]bool)

	cwd, err := os.Getwd()
	if err != nil {
		expandGlobsLogger.Error("Failed to get current working directory: %v", err)
		return nil, fmt.Errorf("failed to get current working directory: %w", err)
	}
	expandGlobsLogger.Debug("Current working directory: %q", cwd)

	for pattern := range patterns {
		expandGlobsLogger.Debug("Processing glob pattern: %q", pattern)
		static, pattern := SplitPattern(pattern)
		matches, err := doublestar.Glob(os.DirFS(static), pattern)
		if err != nil {
			expandGlobsLogger.Warning("Error expanding glob %q in %q: %v", pattern, static, err)
			continue
		}
		expandGlobsLogger.Debug("Found %d matches for pattern %q", len(matches), pattern)
		expandGlobsLogger.Trace("Raw matches for pattern %q: %v", pattern, matches)
		for _, m := range matches {
			m = filepath.Join(static, m)
			info, err := os.Stat(m)
			if err != nil {
				expandGlobsLogger.Warning("Error getting file info for %q: %v", m, err)
				continue
			}
			if !info.IsDir() && !filesMap[m] {
				expandGlobsLogger.Trace("Adding unique file to list: %q", m)
				filesMap[m], files = true, append(files, m)
			}
		}
	}

	if len(files) > 0 {
		expandGlobsLogger.Debug("Finished expanding globs. Found %d unique files to process", len(files))
		expandGlobsLogger.Trace("Unique files to process: %v", files)
	} else {
		expandGlobsLogger.Warning("No files found after expanding glob patterns.")
	}
	return files, nil
}

func LoadCommands(args []string) ([]ModifyCommand, error) {
	loadCommandsLogger := modifyCommandLogger.WithPrefix("LoadCommands")
	loadCommandsLogger.Debug("Loading commands from arguments (cook files or direct patterns)")
	loadCommandsLogger.Trace("Input arguments: %v", args)
	commands := []ModifyCommand{}

	for _, arg := range args {
		loadCommandsLogger.Debug("Processing argument for commands: %q", arg)
		newCommands, err := LoadCommandsFromCookFiles(arg)
		if err != nil {
			loadCommandsLogger.Error("Failed to load commands from argument %q: %v", arg, err)
			return nil, fmt.Errorf("failed to load commands from cook files: %w", err)
		}
		loadCommandsLogger.Debug("Successfully loaded %d commands from %q", len(newCommands), arg)
		for _, cmd := range newCommands {
			if cmd.Disabled {
				loadCommandsLogger.Debug("Skipping disabled command: %q", cmd.Name)
				continue
			}
			commands = append(commands, cmd)
			loadCommandsLogger.Trace("Added command %q. Current total commands: %d", cmd.Name, len(commands))
		}
	}

	loadCommandsLogger.Info("Finished loading commands. Total %d commands loaded", len(commands))
	return commands, nil
}

func LoadCommandsFromCookFiles(pattern string) ([]ModifyCommand, error) {
	loadCookFilesLogger := modifyCommandLogger.WithPrefix("LoadCommandsFromCookFiles").WithField("pattern", pattern)
	loadCookFilesLogger.Debug("Loading commands from cook files based on pattern")
	loadCookFilesLogger.Trace("Input pattern: %q", pattern)
	static, pattern := SplitPattern(pattern)
	commands := []ModifyCommand{}
	cookFiles, err := doublestar.Glob(os.DirFS(static), pattern)
	if err != nil {
		loadCookFilesLogger.Error("Failed to glob cook files for pattern %q: %v", pattern, err)
		return nil, fmt.Errorf("failed to glob cook files: %w", err)
	}
	loadCookFilesLogger.Debug("Found %d cook files for pattern %q", len(cookFiles), pattern)
	loadCookFilesLogger.Trace("Cook files found: %v", cookFiles)

	for _, cookFile := range cookFiles {
		cookFile = filepath.Join(static, cookFile)
		cookFile = filepath.Clean(cookFile)
		cookFile = strings.ReplaceAll(cookFile, "\\", "/")
		loadCookFilesLogger.Debug("Loading commands from individual cook file: %q", cookFile)

		cookFileData, err := os.ReadFile(cookFile)
		if err != nil {
			loadCookFilesLogger.Error("Failed to read cook file %q: %v", cookFile, err)
			return nil, fmt.Errorf("failed to read cook file: %w", err)
		}
		loadCookFilesLogger.Trace("Read %d bytes from cook file %q", len(cookFileData), cookFile)
		newCommands, err := LoadCommandsFromCookFile(cookFileData)
		if err != nil {
			loadCookFilesLogger.Error("Failed to load commands from cook file data for %q: %v", cookFile, err)
			return nil, fmt.Errorf("failed to load commands from cook file: %w", err)
		}
		commands = append(commands, newCommands...)
		loadCookFilesLogger.Debug("Added %d commands from cook file %q. Total commands now: %d", len(newCommands), cookFile, len(commands))
	}

	loadCookFilesLogger.Debug("Finished loading commands from cook files. Total %d commands", len(commands))
	return commands, nil
}

func LoadCommandsFromCookFile(cookFileData []byte) ([]ModifyCommand, error) {
	loadCommandLogger := modifyCommandLogger.WithPrefix("LoadCommandsFromCookFile")
	loadCommandLogger.Debug("Unmarshaling commands from cook file data")
	loadCommandLogger.Trace("Cook file data length: %d", len(cookFileData))
	commands := []ModifyCommand{}
	err := yaml.Unmarshal(cookFileData, &commands)
	if err != nil {
		loadCommandLogger.Error("Failed to unmarshal cook file data: %v", err)
		return nil, fmt.Errorf("failed to unmarshal cook file: %w", err)
	}
	loadCommandLogger.Debug("Successfully unmarshaled %d commands", len(commands))
	loadCommandLogger.Trace("Unmarshaled commands: %v", commands)
	return commands, nil
}

// CountGlobsBeforeDedup counts the total number of glob patterns across all commands before deduplication
func CountGlobsBeforeDedup(commands []ModifyCommand) int {
	countGlobsLogger := modifyCommandLogger.WithPrefix("CountGlobsBeforeDedup")
	countGlobsLogger.Debug("Counting glob patterns before deduplication")
	count := 0
	for _, cmd := range commands {
		countGlobsLogger.Trace("Processing command %q, adding %d globs", cmd.Name, len(cmd.Files))
		count += len(cmd.Files)
	}
	countGlobsLogger.Debug("Total glob patterns before deduplication: %d", count)
	return count
}

func FilterCommands(commands []ModifyCommand, filter string) []ModifyCommand {
	filterCommandsLogger := modifyCommandLogger.WithPrefix("FilterCommands").WithField("filter", filter)
	filterCommandsLogger.Debug("Filtering commands")
	filterCommandsLogger.Trace("Input commands: %v", commands)
	filteredCommands := []ModifyCommand{}
	filters := strings.Split(filter, ",")
	filterCommandsLogger.Trace("Split filters: %v", filters)
	for _, cmd := range commands {
		filterCommandsLogger.Debug("Checking command %q against filters", cmd.Name)
		for _, f := range filters {
			if strings.Contains(cmd.Name, f) {
				filterCommandsLogger.Debug("Command %q matches filter %q, adding to filtered list", cmd.Name, f)
				filteredCommands = append(filteredCommands, cmd)
				break // Command matches, no need to check other filters
			}
		}
	}
	filterCommandsLogger.Debug("Finished filtering commands. Found %d filtered commands", len(filteredCommands))
	filterCommandsLogger.Trace("Filtered commands: %v", filteredCommands)
	return filteredCommands
}