package webui

import (
	"net/http"
	"strconv"
	"strings"
)

var validConditionFields = map[string]bool{"from": true, "to": true, "subject": true}
var validConditionOps = map[string]bool{"contains": true, "equals": true, "starts_with": true}
var validActions = map[string]bool{"move_to_folder": true, "delete": true, "mark_read": true}

func (a *App) rulesList(w http.ResponseWriter, r *http.Request) {
	mailbox, ok := a.mailboxWithAccess(w, r)
	if !ok {
		return
	}
	rules, err := a.DB.ListRulesForMailbox(mailbox.ID)
	if err != nil {
		setFlash(w, "error", "Error loading rules")
	}
	a.render(w, r, "mailbox_rules.html", M{"active": "mailboxes", "mailbox": mailbox, "rules": rules})
}

// addRule mirrors the compact list-CRUD pattern used elsewhere: no separate edit
// page, just add/remove — a rule needing changes is removed and re-added.
func (a *App) addRule(w http.ResponseWriter, r *http.Request) {
	mailbox, ok := a.mailboxWithAccess(w, r)
	if !ok {
		return
	}
	priority, _ := strconv.Atoi(r.FormValue("priority"))
	field := r.FormValue("condition_field")
	op := r.FormValue("condition_op")
	value := strings.TrimSpace(r.FormValue("condition_value"))
	action := r.FormValue("action")
	actionValue := strings.TrimSpace(r.FormValue("action_value"))

	if !validConditionFields[field] || !validConditionOps[op] || value == "" || !validActions[action] {
		setFlash(w, "error", "Please fill in a valid condition and action")
		http.Redirect(w, r, Prefix+"/mailboxes/"+idStr(r)+"/rules", http.StatusFound)
		return
	}
	if action == "move_to_folder" && actionValue == "" {
		setFlash(w, "error", "Please name the folder to move matching mail into")
		http.Redirect(w, r, Prefix+"/mailboxes/"+idStr(r)+"/rules", http.StatusFound)
		return
	}
	if _, err := a.DB.CreateRule(mailbox.ID, priority, field, op, value, action, actionValue); err != nil {
		setFlash(w, "error", "Error creating rule")
	} else {
		setFlash(w, "success", "Rule added")
	}
	http.Redirect(w, r, Prefix+"/mailboxes/"+idStr(r)+"/rules", http.StatusFound)
}

func (a *App) removeRule(w http.ResponseWriter, r *http.Request) {
	mailbox, ok := a.mailboxWithAccess(w, r)
	if !ok {
		return
	}
	ruleID := int64(atoi(r.PathValue("rule_id")))
	if err := a.DB.RemoveRule(ruleID, mailbox.ID); err != nil {
		setFlash(w, "error", "Error removing rule")
	} else {
		setFlash(w, "success", "Rule removed")
	}
	http.Redirect(w, r, Prefix+"/mailboxes/"+idStr(r)+"/rules", http.StatusFound)
}