package repostatus

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

	"go.wit.com/log"
)

// GitConfig represents the parsed .git/config data
// type GitConfig map[string]map[string]string

type remote struct {
	url   string
	fetch string
}

type branch struct {
	remote string
	merge  string
}

type GitConfig struct {
	core     map[string]string  // map[origin] = "https:/git.wit.org/gui/gadgets"
	remotes  map[string]*remote // map[origin] = "https:/git.wit.org/gui/gadgets"
	branches map[string]*branch // map[guimaster] = origin guimaster
}

type GoConfig map[string]string

func listGitDirectories() []string {
	var all []string
	homeDir, err := os.UserHomeDir()
	if err != nil {
		log.Log(WARN, "Error getting home directory:", err)
		return nil
	}

	srcDir := filepath.Join(homeDir, "go/src")

	err = filepath.Walk(srcDir, func(path string, info os.FileInfo, err error) error {
		if err != nil {
			log.Log(WARN, "Error accessing path:", path, err)
			return nil
		}

		// Check if the current path is a directory and has a .git subdirectory
		if info.IsDir() && isGitDir(path) {
			all = append(all, path)
			// fmt.Println(path)
		}

		return nil
	})

	if err != nil {
		log.Log(WARN, "Error walking the path:", srcDir, err)
	}

	return all
}

// isGitDir checks if a .git directory exists inside the given directory
func isGitDir(dir string) bool {
	gitDir := filepath.Join(dir, ".git")
	info, err := os.Stat(gitDir)
	if os.IsNotExist(err) {
		return false
	}
	return info.IsDir()
}

// readGitConfig reads and parses the .git/config file
func readGitConfig(filePath string) (*GitConfig, error) {
	file, err := os.Open(filePath)
	if err != nil {
		return nil, err
	}
	defer file.Close()

	var currentSection string = ""
	var currentName string = ""

	config := new(GitConfig)
	config.core = make(map[string]string)
	config.remotes = make(map[string]*remote)
	config.branches = make(map[string]*branch)

	scanner := bufio.NewScanner(file)
	for scanner.Scan() {
		line := strings.TrimSpace(scanner.Text())

		// Skip empty lines and comments
		if line == "" || strings.HasPrefix(line, "#") || strings.HasPrefix(line, ";") {
			continue
		}

		// Check for section headers
		if strings.HasPrefix(line, "[") && strings.HasSuffix(line, "]") {
			line = strings.Trim(line, "[]")
			parts := strings.Split(line, " ")
			currentSection = parts[0]

			if len(parts) == 2 {
				line = strings.Trim(line, "[]")
				currentName = strings.Trim(parts[1], "\"")
			}
			continue
		}

		partsNew := strings.SplitN(line, "=", 2)
		if len(partsNew) != 2 {
			log.Log(WARN, "error on config section:", currentSection, "line:", line)
		}

		key := strings.TrimSpace(partsNew[0])
		key = strings.TrimSuffix(key, "\"")

		value := strings.TrimSpace(partsNew[1])
		value = strings.TrimSuffix(value, "\"")

		switch currentSection {
		case "core":
			config.core[key] = value
		case "remote":
			test, ok := config.remotes[currentName]
			if !ok {
				test = new(remote)
				config.remotes[currentName] = test
			}
			log.Log(INFO, "switch currentSection", currentSection, currentName)
			switch key {
			case "url":
				if test.url == value {
					continue
				}
				if test.url == "" {
					test.url = value
					continue
				}
				log.Log(WARN, "error url mismatch", test.url, value)
			case "fetch":
				if test.fetch == value {
					continue
				}
				if test.fetch == "" {
					test.fetch = value
					continue
				}
				log.Log(WARN, "error fetch mismatch", test.fetch, value)
			default:
				log.Log(WARN, "error unknown remote:", currentSection, currentName, "key", key, "value", value)
			}
		case "branch":
			test, ok := config.branches[currentName]
			if !ok {
				test = new(branch)
				config.branches[currentName] = test
			}
			switch key {
			case "remote":
				config.branches[currentName].remote = value
			case "merge":
				config.branches[currentName].merge = value
			default:
				log.Log(WARN, "error unknown remote:", currentSection, currentName, key, value)
			}
		default:
			log.Log(WARN, "error unknown currentSection", currentSection, "line:", line)
		}
	}

	if err := scanner.Err(); err != nil {
		return nil, err
	}

	return config, nil
}

// readGoMod reads and parses the go.sum file (TODO: do the go.mod file)
func (rs *RepoStatus) ReadGoMod() bool {
	tmp := filepath.Join(rs.realPath.String(), "go.sum")
	gomod, err := os.Open(tmp)
	if err != nil {
		log.Log(WARN, "missing go.mod", rs.realPath.String())
		rs.goConfig = nil
		return false
	}
	defer gomod.Close()

	tmp = filepath.Join(rs.realPath.String(), "go.sum")
	gosum, err := os.Open(tmp)
	if err != nil {
		log.Log(WARN, "missing go.sum", rs.realPath.String())
		rs.goConfig = nil
		return false
	}
	defer gosum.Close()

	var deps GoConfig
	deps = make(GoConfig)

	scanner := bufio.NewScanner(gosum)
	log.Log(INFO, "gosum:", tmp)
	for scanner.Scan() {
		line := strings.TrimSpace(scanner.Text())

		parts := strings.Split(line, " ")
		if len(parts) == 3 {
			godep := strings.TrimSpace(parts[0])
			version := strings.TrimSpace(parts[1])
			if strings.HasSuffix(version, "/go.mod") {
				version = strings.TrimSuffix(version, "/go.mod")
			}
			currentversion, ok := deps[godep]
			if ok {
				if currentversion != version {
					log.Log(WARN, "versions do not match!!!", deps[godep], version, currentversion)
				}
			} else {
				deps[godep] = version
				log.Log(INFO, "\t", godep, "=", version)
			}
		} else {
			log.Log(WARN, "\t INVALID:", parts)
		}
	}

	if err := scanner.Err(); err != nil {
		rs.goConfig = nil
		return false
	}

	rs.goConfig = deps
	return true
}

func ScanGoSrc() {
	log.Log(WARN, "Scanning all go.sum files")
	for path, rs := range windowMap {
		if rs.ReadGoMod() {
			// everything is ok
		} else {
			log.Log(WARN, "failed reading go.sum repo:", path)
		}
	}
}

func ScanGitConfig() {
	for i, path := range listGitDirectories() {
		filename := filepath.Join(path, ".git/config")
		_, err := readGitConfig(filename)
		if err != nil {
			log.Log(WARN, "repo =", i, path)
			log.Log(WARN, "Error reading .git/config:", err)
		}
	}
}