package config

import (
	"regexp"
	"sort"
	"strings"

	"gopkg.in/yaml.v3"
)

func loadV1Config(content []byte) (*ZurgConfigV1, error) {
	var configV1 ZurgConfigV1
	if err := yaml.Unmarshal(content, &configV1); err != nil {
		return nil, err
	}

	return &configV1, nil
}

func (z *ZurgConfigV1) GetDirectories() []string {
	rootDirectories := make([]string, len(z.Directories))
	i := 0
	for directory := range z.Directories {
		rootDirectories[i] = directory
		i++
	}
	return rootDirectories
}

func (z *ZurgConfigV1) GetGroupMap() map[string][]string {
	var groupMap = make(map[string][]string)
	var groupOrderMap = make(map[string]int) // To store GroupOrder for each directory

	// Populate the groupMap and groupOrderMap
	for directory, val := range z.Directories {
		groupMap[val.Group] = append(groupMap[val.Group], directory)
		groupOrderMap[directory] = val.GroupOrder
	}

	// Sort the slice based on GroupOrder and then directory name for deterministic order
	for group, dirs := range groupMap {
		sort.Slice(dirs, func(i, j int) bool {
			if groupOrderMap[dirs[i]] == groupOrderMap[dirs[j]] {
				return dirs[i] < dirs[j] // Use directory name as secondary sort criterion
			}
			return groupOrderMap[dirs[i]] < groupOrderMap[dirs[j]]
		})
		groupMap[group] = dirs
	}

	// Return a deep copy of the map
	result := make(map[string][]string)
	for k, v := range groupMap {
		temp := make([]string, len(v))
		copy(temp, v)
		result[k] = temp
	}

	return result
}

func (z *ZurgConfigV1) MeetsConditions(directory, torrentID, torrentName string, fileNames []string) bool {
	if _, ok := z.Directories[directory]; !ok {
		return false
	}
	for _, filter := range z.Directories[directory].Filters {
		if z.matchFilter(torrentID, torrentName, fileNames, filter) {
			return true
		}
	}
	return false
}

func (z *ZurgConfigV1) matchFilter(fileID, torrentName string, fileNames []string, filter *FilterConditionsV1) bool {
	if filter.ID != "" && fileID == filter.ID {
		return true
	}
	if filter.RegexStr != "" {
		regex := compilePattern(filter.RegexStr)
		if regex.MatchString(torrentName) {
			return true
		}
	}
	if filter.ContainsStrict != "" && strings.Contains(torrentName, filter.ContainsStrict) {
		return true
	}
	if filter.Contains != "" && strings.Contains(strings.ToLower(torrentName), strings.ToLower(filter.Contains)) {
		return true
	}
	if filter.NotContainsStrict != "" && !strings.Contains(torrentName, filter.NotContainsStrict) {
		return true
	}
	if filter.NotContains != "" && !strings.Contains(strings.ToLower(torrentName), strings.ToLower(filter.NotContains)) {
		return true
	}
	if len(filter.And) > 0 {
		andResult := true
		for _, andFilter := range filter.And {
			andResult = andResult && z.matchFilter(fileID, torrentName, fileNames, andFilter)
			if !andResult {
				return false
			}
		}
		return true
	}
	if len(filter.Or) > 0 {
		for _, orFilter := range filter.Or {
			if z.matchFilter(fileID, torrentName, fileNames, orFilter) {
				return true
			}
		}
	}
	if filter.FileInsideRegexStr != "" {
		regex := compilePattern(filter.FileInsideRegexStr)
		for _, filename := range fileNames {
			if regex.MatchString(filename) {
				return true
			}
		}
	}
	if filter.FileInsideContains != "" {
		for _, filename := range fileNames {
			if strings.Contains(strings.ToLower(filename), strings.ToLower(filter.FileInsideContains)) {
				return true
			}
		}
	}
	if filter.FileInsideContainsStrict != "" {
		for _, filename := range fileNames {
			if strings.Contains(filename, filter.FileInsideContainsStrict) {
				return true
			}
		}
	}
	return false
}

func compilePattern(pattern string) *regexp.Regexp {
	flags := map[rune]string{
		'i': "(?i)",
		'm': "(?m)",
		's': "(?s)",
		'x': "(?x)",
	}

	lastSlash := strings.LastIndex(pattern, "/")
	secondLastSlash := strings.LastIndex(pattern[:lastSlash], "/")

	// Extract the core pattern
	corePattern := pattern[secondLastSlash+1 : lastSlash]

	// Extract and process flags
	flagSection := pattern[lastSlash+1:]
	flagString := ""
	processedFlags := make(map[rune]bool)
	for _, flag := range flagSection {
		if replacement, ok := flags[flag]; ok && !processedFlags[flag] {
			flagString += replacement
			processedFlags[flag] = true
		}
	}

	// Combine the processed flags with the core pattern
	finalPattern := flagString + corePattern

	// Validate pattern
	if finalPattern == "" || finalPattern == flagString {
		return nil
	}

	return regexp.MustCompile(finalPattern)
}