package main

import (
	"context"
	"fmt"
	"io/ioutil"
	"os"
	"os/exec"
	"regexp"
	"strings"

	"github.com/wailsapp/wails/v2/pkg/runtime"
)

// App struct
type App struct {
	ctx context.Context

	inputList []string

	remeberedPath []string
}

func GetRemeberPath() (string, error) {
	homedir, err := os.UserHomeDir()
	if err != nil {
		return "", err
	}

	return fmt.Sprintf("%s/.config/railgun-remeber", homedir), nil
}

// NewApp creates a new App application struct
func NewApp() *App {
	return &App{
		inputList:     []string{},
		remeberedPath: []string{},
	}
}

// startup is called when the app starts. The context is saved
// so we can call the runtime methods
func (a *App) startup(ctx context.Context) {
	a.ctx = ctx

	remeberPath, err := GetRemeberPath()
	if err != nil {
		return
	}
	if _, err := os.Stat(remeberPath); err != nil {
		return
	}
	data, err := ioutil.ReadFile(remeberPath)

	base := strings.Split(string(data), "\n")
	a.remeberedPath = []string{}

	for _, elm := range base {
		if elm != "" {
			a.remeberedPath = append(a.remeberedPath, elm)
		}
	}
}

func (a *App) Close() {
	runtime.Quit(a.ctx)
}

func (a *App) SearchMath(value string) *string {
	if strings.ContainsAny(value, "0123456789") {
		out, err := exec.Command("numbat", "-e", value).Output()
		if err == nil {
			res := string(out[:])
			return &res
		}
	}
	return nil
}

func (a *App) SearchDict(value string) *string {
	if strings.Contains(value, " ") {
		return nil
	}
	out, err := exec.Command("sdcv", "-jne", value).Output()
	if err == nil {
		res := string(out[:])
		return &res
	}
	return nil
}

func (a *App) SearchMathEql(value string) *string {
	if !strings.Contains(value, "=") {
		return nil
	}

	cmd := exec.Command("maxima", "--q", "--very-quiet")
	stdin, err := cmd.StdinPipe()
	if err != nil {
		return nil
	}
	stdin.Write(fmt.Appendf([]byte{}, "solve([ %s ]);\n", value))
	stdin.Close()

	out, err := cmd.Output()
	if err == nil {
		res := string(out[:])
		if strings.Contains(res, "solve:") {
			return nil
		}
		return &res
	}
	return nil
}

func (a *App) SearchRemeberDir(value string) []string {
	if value == "" {
		if len(a.remeberedPath) >= 5 {
			return a.remeberedPath[0:6]
		}
		return a.remeberedPath
	}

	reg, err := regexp.Compile(value)
	if err != nil {
		return []string{}
	}

	if len(a.remeberedPath) == 0 {
		return []string{}
	}

	n_list := []string{}

	for _, elm := range a.remeberedPath {
		if reg.MatchString(elm) {
			n_list = append(n_list, elm)
		}
		if len(n_list) >= 5 {
			return n_list
		}
	}

	return n_list
}

// Greet returns a greeting for the given name
func (a *App) Search(value string) []string {
	if len(a.inputList) == 0 {
		// Perform search
		paths := strings.Split(os.Getenv("PATH"), ":")
		for _, elm := range paths {
			entries, err := os.ReadDir(elm)
			if err != nil {
				continue
			}

			for _, e := range entries {
				stat, err := os.Stat(fmt.Sprintf("%s/%s", elm, e.Name()))
				if err != nil {
					continue
				}
				// For now do not recurse
				if stat.IsDir() {
					continue
				}

				a.inputList = append(a.inputList, e.Name())
			}
		}
	}

	n_list := []string{}

	for _, elm := range a.inputList {
		if strings.HasPrefix(elm, value) {
			n_list = append(n_list, elm)
		}
	}

	return n_list
}

func (a *App) Enter(value string) {
	fmt.Printf("%s", value)
	runtime.Quit(a.ctx)
}

func (a *App) EnterDir(value string) {
	fmt.Printf("ghostty --working-directory=%s", value)
	runtime.Quit(a.ctx)
}

func (a *App) EnterEditor(value string) {
	fmt.Printf("czed %s", value)
	runtime.Quit(a.ctx)
}