package handlers

import (
	"net/http"
	"strconv"
	"time"

	"github.com/leolionad58/ticketbot/internal/db"
)

// AuditHandler serves GET /audit.
type AuditHandler struct {
	AuditRepo *db.AuditLogRepo
	Renderer  *Renderer
}

// auditActions lists all known audit action constants for the filter dropdown.
var auditActions = []string{
	db.AuditCreatePanel,
	db.AuditUpdatePanel,
	db.AuditDeletePanel,
	db.AuditCreateType,
	db.AuditUpdateType,
	db.AuditDeleteType,
	db.AuditReorderTypes,
	db.AuditUpdateConvoc,
	db.AuditSendPanelDiscord,
	db.AuditDeletePanelMsg,
	db.AuditRevokeSession,
	db.AuditRevokeAllSess,
	db.AuditAdminLogin,
	db.AuditAdminLoginFail,
	db.AuditAdminLocked,
}

type auditData struct {
	baseData
	Entries []*db.AuditLogEntry
	Total   int
	Page    int
	Pages   int
	Actions []string
	// Filter values
	FAdminID string
	FAction  string
	FFrom    string
	FTo      string
}

// HandleList serves GET /audit.
func (h *AuditHandler) HandleList(w http.ResponseWriter, r *http.Request) {
	ctx := r.Context()
	base := h.Renderer.base(r, "audit")

	q := r.URL.Query()
	fAdminID := q.Get("admin_id")
	fAction := q.Get("action")
	fFrom := q.Get("from")
	fTo := q.Get("to")
	page, _ := strconv.Atoi(q.Get("page"))
	if page < 1 {
		page = 1
	}

	var adminID int64
	if fAdminID != "" {
		adminID, _ = strconv.ParseInt(fAdminID, 10, 64)
	}

	filter := db.AuditFilter{
		AdminID: adminID,
		Action:  fAction,
	}
	if fFrom != "" {
		if t, err := time.Parse("2006-01-02", fFrom); err == nil {
			filter.From = t
		}
	}
	if fTo != "" {
		if t, err := time.Parse("2006-01-02", fTo); err == nil {
			filter.To = t.Add(24*time.Hour - time.Second)
		}
	}

	const pageSize = 50
	entries, total, err := h.AuditRepo.List(ctx, filter, page, pageSize)
	if err != nil {
		http.Error(w, "db error: "+err.Error(), http.StatusInternalServerError)
		return
	}
	pages := total / pageSize
	if total%pageSize != 0 {
		pages++
	}
	if pages < 1 {
		pages = 1
	}

	h.Renderer.Page(w, "audit", auditData{
		baseData: base,
		Entries:  entries,
		Total:    total,
		Page:     page,
		Pages:    pages,
		Actions:  auditActions,
		FAdminID: fAdminID,
		FAction:  fAction,
		FFrom:    fFrom,
		FTo:      fTo,
	})
}