package rest

import (
	"errors"
	"fmt"
	"html/template"
	"net/http"
	"reflect"
)

type Context struct {
	Req    *http.Request
	Resp   http.ResponseWriter
	Params map[string]string

	RespData       []byte
	RespStatusCode int

	MatchedRoute string
}

func (c *Context) Render(ts *template.Template, name string, data any) {
	t := ts.Lookup(fmt.Sprintf("%s.gohtml", name))
	c.Resp.Header().Set("Content-Type", "text/html")
	c.Resp.WriteHeader(200)
	t.Execute(c.Resp, data)
}

func (c *Context) RespString(msg string, statusCode int) {
	c.Resp.WriteHeader(statusCode)
	c.Resp.Write([]byte(msg))
}

func (c *Context) Redirect(url string) {
	http.Redirect(c.Resp, c.Req, url, http.StatusTemporaryRedirect)
}

func (c *Context) Bind(data any) error {
	req := c.Req
	err := req.ParseForm()
	if err != nil {
		return err
	}

	typ := reflect.TypeOf(data)
	if typ.Kind() != reflect.Pointer {
		return errors.New("pointer needed")
	}

	for typ.Kind() != reflect.Struct {
		typ = typ.Elem()
	}

	val := reflect.ValueOf(data).Elem()

	for i := 0; i < val.NumField(); i++ {
		field := val.Field(i)
		if field.CanSet() {
			sf := typ.Field(i)
			fValue, ok := sf.Tag.Lookup("form")
			if ok {
				getValue := req.PostForm.Get(fValue)
				field.Set(reflect.ValueOf(getValue))
			}
		}
	}

	return nil

}

func (c *Context) Query(key string) string {
	qs := c.Req.URL.Query()
	return qs.Get(key)
}