package server

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

	"github.com/gin-gonic/gin"

	"warpbox/lib/activity"
	"warpbox/lib/alerts"
	"warpbox/lib/security"
)

type adminAlertsActionRequest struct {
	Action string   `json:"action"`
	IDs    []string `json:"ids"`
}

type adminSecurityActionRequest struct {
	Action   string `json:"action"`
	IP       string `json:"ip"`
	BanUntil string `json:"ban_until"`
}

func (app *App) reloadSecurityConfig() {
	if app.securityGuard == nil {
		app.securityGuard = security.NewGuard()
	}
	app.securityGuard.Reload(security.Config{
		IPWhitelist:         app.config.SecurityIPWhitelist,
		AdminIPWhitelist:    app.config.SecurityAdminIPWhitelist,
		LoginWindowSeconds:  app.config.SecurityLoginWindowSeconds,
		LoginMaxAttempts:    app.config.SecurityLoginMaxAttempts,
		BanSeconds:          app.config.SecurityBanSeconds,
		ScanWindowSeconds:   app.config.SecurityScanWindowSeconds,
		ScanMaxAttempts:     app.config.SecurityScanMaxAttempts,
		UploadWindowSeconds: app.config.SecurityUploadWindowSeconds,
		UploadMaxRequests:   app.config.SecurityUploadMaxRequests,
		UploadMaxBytes:      app.config.SecurityUploadMaxBytes,
	})
}

func (app *App) logActivity(kind string, severity string, message string, ctx *gin.Context, meta map[string]string) {
	if app.activityStore == nil {
		return
	}
	event := activity.Event{
		Kind:      kind,
		Severity:  severity,
		Message:   message,
		CreatedAt: time.Now().UTC(),
		Meta:      meta,
	}
	if ctx != nil {
		event.IP = clientIP(ctx)
		event.Path = ctx.Request.URL.Path
		event.Method = ctx.Request.Method
	}
	_ = app.activityStore.Append(event, app.config.ActivityRetentionSeconds)
}

func (app *App) createAlert(title string, severity string, group string, code string, trace string, message string, meta map[string]string) {
	if app.alertStore == nil {
		return
	}
	_ = app.alertStore.Add(alerts.Alert{
		Title:    title,
		Severity: severity,
		Group:    group,
		Code:     code,
		Trace:    trace,
		Message:  message,
		Status:   alerts.StatusOpen,
		Meta:     meta,
	})
}

func (app *App) securityMiddleware() gin.HandlerFunc {
	return func(ctx *gin.Context) {
		if app.securityGuard == nil {
			ctx.Next()
			return
		}
		ip := clientIP(ctx)
		if app.securityGuard.IsWhitelisted(ip) || app.securityGuard.IsAdminWhitelisted(ip) {
			ctx.Next()
			return
		}
		if app.securityGuard.IsBanned(ip) {
			app.logActivity("security.block", "high", "Blocked banned IP", ctx, nil)
			ctx.AbortWithStatusJSON(http.StatusTooManyRequests, gin.H{"error": "Too many abusive requests. Try again later."})
			return
		}
		ctx.Next()
	}
}

func (app *App) handleNoRoute(ctx *gin.Context) {
	if app.securityGuard == nil {
		ctx.JSON(http.StatusNotFound, gin.H{"error": "Not found"})
		return
	}
	path := strings.ToLower(ctx.Request.URL.Path)
	suspicious := strings.Contains(path, "../") || strings.Contains(path, ".php") || strings.Contains(path, "wp-admin") || strings.Contains(path, ".env")
	if suspicious {
		ip := clientIP(ctx)
		if !app.securityGuard.IsWhitelisted(ip) {
			banned, attempts := app.securityGuard.RegisterScanAttempt(ip, app.config.SecurityScanWindowSeconds, app.config.SecurityScanMaxAttempts, app.config.SecurityBanSeconds)
			app.logActivity("security.scan", "medium", "Suspicious path probe detected", ctx, map[string]string{"attempts": intToString(attempts)})
			if banned {
				app.createAlert("IP auto-banned after malicious path scans", "high", "security", "410", "security.scan.autoban", "Repeated malicious path scans triggered temporary ban.", map[string]string{"ip": ip, "attempts": intToString(attempts)})
				app.logActivity("security.ban", "high", "IP auto-banned after scans", ctx, map[string]string{"attempts": intToString(attempts)})
			}
		}
	}
	ctx.JSON(http.StatusNotFound, gin.H{"error": "Not found"})
}

func (app *App) handleAdminActivity(ctx *gin.Context) {
	if app.activityStore == nil {
		ctx.HTML(http.StatusOK, "admin/activity.html", gin.H{
			"AdminUsername": app.config.AdminUsername,
			"AdminEmail":    app.config.AdminEmail,
			"ActivePage":    "activity",
			"Events":        []activity.Event{},
		})
		return
	}
	events, err := app.activityStore.List(400, app.config.ActivityRetentionSeconds)
	if err != nil {
		ctx.String(http.StatusInternalServerError, "Could not load activity")
		return
	}
	ctx.HTML(http.StatusOK, "admin/activity.html", gin.H{
		"AdminUsername": app.config.AdminUsername,
		"AdminEmail":    app.config.AdminEmail,
		"ActivePage":    "activity",
		"Events":        events,
	})
}

func (app *App) handleAdminSecurity(ctx *gin.Context) {
	events := []activity.Event{}
	alertsList := []alerts.Alert{}
	if app.activityStore != nil {
		events, _ = app.activityStore.List(100, app.config.ActivityRetentionSeconds)
	}
	if app.alertStore != nil {
		alertsList, _ = app.alertStore.List(50)
	}
	bans := []security.BanEntry{}
	if app.securityGuard != nil {
		bans = app.securityGuard.BanList()
	}
	ctx.HTML(http.StatusOK, "admin/security.html", gin.H{
		"AdminUsername": app.config.AdminUsername,
		"AdminEmail":    app.config.AdminEmail,
		"ActivePage":    "security",
		"Events":        events,
		"Alerts":        alertsList,
		"Bans":          bans,
	})
}

func (app *App) handleAdminAlertsAction(ctx *gin.Context) {
	if app.alertStore == nil {
		ctx.JSON(http.StatusInternalServerError, gin.H{"error": "Alert store unavailable"})
		return
	}
	var request adminAlertsActionRequest
	if err := ctx.ShouldBindJSON(&request); err != nil {
		ctx.JSON(http.StatusBadRequest, gin.H{"error": "Invalid action payload"})
		return
	}
	switch request.Action {
	case "ack":
		if err := app.alertStore.SetStatus(request.IDs, alerts.StatusAcked); err != nil {
			ctx.JSON(http.StatusInternalServerError, gin.H{"error": "Could not update alerts"})
			return
		}
	case "close":
		if err := app.alertStore.SetStatus(request.IDs, alerts.StatusClosed); err != nil {
			ctx.JSON(http.StatusInternalServerError, gin.H{"error": "Could not update alerts"})
			return
		}
	case "delete":
		if err := app.alertStore.Delete(request.IDs); err != nil {
			ctx.JSON(http.StatusInternalServerError, gin.H{"error": "Could not delete alerts"})
			return
		}
	default:
		ctx.JSON(http.StatusBadRequest, gin.H{"error": "Unknown action"})
		return
	}
	app.logActivity("alerts.action", "low", "Admin changed alert state", ctx, map[string]string{"action": request.Action, "count": intToString(len(request.IDs))})
	alertsList, _ := app.alertStore.List(500)
	ctx.JSON(http.StatusOK, gin.H{"ok": true, "alerts": alertsList})
}

func (app *App) handleAdminSecurityAction(ctx *gin.Context) {
	if app.securityGuard == nil {
		ctx.JSON(http.StatusInternalServerError, gin.H{"error": "Security guard unavailable"})
		return
	}
	var request adminSecurityActionRequest
	if err := ctx.ShouldBindJSON(&request); err != nil {
		ctx.JSON(http.StatusBadRequest, gin.H{"error": "Invalid action payload"})
		return
	}
	ip := strings.TrimSpace(request.IP)
	if ip != "" && net.ParseIP(ip) == nil {
		ctx.JSON(http.StatusBadRequest, gin.H{"error": "Invalid IP"})
		return
	}
	switch request.Action {
	case "ban":
		if ip == "" {
			ctx.JSON(http.StatusBadRequest, gin.H{"error": "Missing IP"})
			return
		}
		app.securityGuard.Ban(ip, app.config.SecurityBanSeconds)
		app.logActivity("security.manual_ban", "high", "Admin banned IP", ctx, map[string]string{"ip": ip})
		app.createAlert("IP manually banned by admin", "medium", "security", "420", "security.manual.ban", "Admin manually applied temporary ban.", map[string]string{"ip": ip})
		ctx.JSON(http.StatusOK, gin.H{"ok": true, "message": "IP banned", "bans": app.securityGuard.BanList()})
	case "ban_until":
		if ip == "" {
			ctx.JSON(http.StatusBadRequest, gin.H{"error": "Missing IP"})
			return
		}
		until, err := time.Parse(time.RFC3339, strings.TrimSpace(request.BanUntil))
		if err != nil || until.Before(time.Now().UTC()) {
			ctx.JSON(http.StatusBadRequest, gin.H{"error": "Invalid ban expiration"})
			return
		}
		app.securityGuard.BanUntil(ip, until)
		app.logActivity("security.manual_ban_until", "high", "Admin set custom ban expiration", ctx, map[string]string{"ip": ip, "until": until.UTC().Format(time.RFC3339)})
		app.createAlert("Custom IP ban applied by admin", "medium", "security", "421", "security.manual.ban_until", "Admin set explicit ban expiration date.", map[string]string{"ip": ip, "until": until.UTC().Format(time.RFC3339)})
		ctx.JSON(http.StatusOK, gin.H{"ok": true, "message": "IP ban expiration updated", "bans": app.securityGuard.BanList()})
	case "unban":
		if ip == "" {
			ctx.JSON(http.StatusBadRequest, gin.H{"error": "Missing IP"})
			return
		}
		app.securityGuard.Unban(ip)
		app.logActivity("security.manual_unban", "medium", "Admin unbanned IP", ctx, map[string]string{"ip": ip})
		app.createAlert("IP unbanned by admin", "low", "security", "422", "security.manual.unban", "Admin manually removed temporary ban.", map[string]string{"ip": ip})
		ctx.JSON(http.StatusOK, gin.H{"ok": true, "message": "IP unbanned", "bans": app.securityGuard.BanList()})
	default:
		ctx.JSON(http.StatusBadRequest, gin.H{"error": "Unknown action"})
	}
}

func intToString(value int) string {
	return strconv.Itoa(value)
}