package tpl

import (
	"context"
	"encoding/json"
	"fmt"
	"html/template"
	"io/fs"
	"net/http"
	"os"
	"path/filepath"
	"slices"
	"strings"

	"management/internal/db/model/dto"
	"management/internal/pkg/know"
	templates "management/web/templates/manage"

	"github.com/justinas/nosurf"
)

func (r *render) setDefaultData(req *http.Request, data map[string]any) map[string]any {
	if data == nil {
		data = make(map[string]any)
	}

	ctx := req.Context()
	isAuth := r.session.Exists(ctx, know.StoreName)
	data["IsAuthenticated"] = isAuth
	if isAuth {
		var authUser dto.AuthorizeUser
		u := r.session.GetBytes(ctx, know.StoreName)
		_ = json.Unmarshal(u, &authUser)

		data["AuthorizeMenus"] = r.getCurrentPathBtns(ctx, authUser.RoleID, req.URL.Path)
	}
	token := nosurf.Token(req)
	data["CsrfToken"] = token
	data["CsrfTokenField"] = template.HTML(fmt.Sprintf(`<input type="hidden" name="csrf_token" value="%s" />`, token))

	return data
}

func (r *render) getCurrentPathBtns(ctx context.Context, roleID int32, path string) []*dto.OwnerMenuDto {
	var res []*dto.OwnerMenuDto

	// 获取当前path的菜单
	menu, err := r.menuBiz.GetSysMenuByUrl(ctx, path)
	if err != nil {
		return res
	}

	// 获取权限
	menus, err := r.menuBiz.ListOwnerMenuByRoleID(ctx, roleID)
	if err != nil {
		return res
	}

	for _, item := range menus {
		if menu.IsList {
			if item.ParentID == menu.ID || item.ID == menu.ID {
				res = append(res, item)
			}
		} else {
			if item.ParentID == menu.ParentID {
				res = append(res, item)
			}
		}
	}

	return res
}

func (r *render) createTemplateCache() (map[string]*template.Template, error) {
	cache := make(map[string]*template.Template)
	pages, err := getFiles(r.config.Root, r.config.Extension)
	if err != nil {
		return nil, err
	}

	layoutAndPartial, err := r.getLayoutAndPartials()
	if err != nil {
		return nil, err
	}

	for _, page := range pages {
		if strings.HasPrefix(page, "base") || strings.HasSuffix(page, "partial") {
			continue
		}

		name := filepath.Base(page)
		pathArr := strings.Split(page, "/")
		dir := pathArr[len(pathArr)-2 : len(pathArr)-1]
		templateName := fmt.Sprintf("%s_%s", dir[0], name)
		ts := template.Must(template.New(templateName).Funcs(r.btnFuncs()).Funcs(r.Methods()).ParseFS(templates.TemplateFS, page))
		if err != nil {
			return nil, err
		}

		ts, err = ts.ParseFS(templates.TemplateFS, layoutAndPartial...)
		if err != nil {
			return nil, err
		}

		cache[templateName] = ts
	}

	return cache, nil
}

func (r *render) getLayoutAndPartials() ([]string, error) {
	layouts, err := getFiles(r.config.Layout, r.config.Extension)
	if err != nil {
		return nil, err
	}

	partials, err := getFiles(r.config.Partial, r.config.Extension)
	if err != nil {
		return nil, err
	}

	return slices.Concat(layouts, partials), nil
}

func getFiles(path string, stuffix string) ([]string, error) {
	files := make([]string, 0)
	b, err := pathExists(templates.TemplateFS, path)
	if err != nil {
		return nil, err
	}

	if !b {
		return files, nil
	}

	err = fs.WalkDir(templates.TemplateFS, path, func(path string, d fs.DirEntry, err error) error {
		if err != nil {
			return err
		}
		if d.IsDir() {
			return nil
		}
		if strings.HasSuffix(path, stuffix) {
			files = append(files, path)
		}
		return nil
	})
	// err := filepath.Walk(path, func(path string, info os.FileInfo, err error) error {
	// 	if info == nil {
	// 		return err
	// 	}
	// 	if info.IsDir() {
	// 		return nil
	// 	}
	// 	// 将模板后缀的文件放到列表
	// 	if strings.HasSuffix(path, stuffix) {
	// 		files = append(files, path)
	// 	}
	// 	return nil
	// })
	return files, err
}

func pathExists(fs fs.FS, path string) (bool, error) {
	_, err := fs.Open(path)
	if err != nil {
		if os.IsNotExist(err) {
			return false, nil
		}
		return false, err
	}
	return true, err
}

func firstLower(s string) string {
	if len(s) == 0 {
		return s
	}

	return strings.ToLower(s[:1]) + s[1:]
}