package plugins

import (
	"fmt"
	"log"
	"regexp"

	"github.com/matrix-org/gomatrix"
)

// OpenBSDMan responds to beer requests
type OpenBSDMan struct {
}

// Descr describes this plugin
func (h *OpenBSDMan) Descr() string {
	return "Produces a link to man.openbsd.org."
}

// Re matches our man format
func (h *OpenBSDMan) Re() string {
	return `(?i)^man: ([1-9]?p?)\s?(\w+)$`
}

func (h *OpenBSDMan) fix(msg string) string {
	re := regexp.MustCompile(h.Re())
	resp := ""
	section := re.ReplaceAllString(msg, "$1")
	if section == msg {
		return ""
	}
	if section != "" {
		resp = re.ReplaceAllString(msg, "$2.$1")
	} else {
		resp = re.ReplaceAllString(msg, "$2")
	}

	return resp
}

// Match checks for our man page re
func (h *OpenBSDMan) Match(user, msg string) bool {
	re := regexp.MustCompile(h.Re())
	return re.MatchString(msg)
}

// SetStore does nothing in OpenBSDMan
func (h *OpenBSDMan) SetStore(s PluginStore) {}

// RespondText sends back a man page.
func (h *OpenBSDMan) RespondText(c *gomatrix.Client, ev *gomatrix.Event, user, post string) {
	page := h.fix(post)
	if page != "" {
		log.Printf("%s: responding to '%s'", h.Name(), ev.Sender)
		SendText(c, ev.RoomID, fmt.Sprintf("https://man.openbsd.org/%s", page))
	}
}

// Name OpenBSDMan!
func (h *OpenBSDMan) Name() string {
	return "OpenBSDMan"
}