package api

import (
	"encoding/json"
	"log"
	"net/http"
	"strconv"
	"time"

	"github.com/cynfo/rmm-backend/ws"
)

// GET /api/v1/tasks
func (h *Handler) listTasks(w http.ResponseWriter, r *http.Request) {
	limit := 50
	offset := 0
	agentID := r.URL.Query().Get("agent_id")
	status := r.URL.Query().Get("status")
	action := r.URL.Query().Get("action")

	if l := r.URL.Query().Get("limit"); l != "" {
		if n, err := strconv.Atoi(l); err == nil && n > 0 {
			limit = n
		}
	}
	if o := r.URL.Query().Get("offset"); o != "" {
		if n, err := strconv.Atoi(o); err == nil && n >= 0 {
			offset = n
		}
	}

	tasks, total, err := h.db.GetTasks(limit, offset, agentID, status, action)
	if err != nil {
		log.Printf("Tasks laden fehlgeschlagen: %v", err)
		writeError(w, http.StatusInternalServerError, "Fehler beim Laden")
		return
	}

	writeJSON(w, http.StatusOK, map[string]interface{}{
		"data":  tasks,
		"total": total,
	})
}

// GET /api/v1/tasks/{id}
func (h *Handler) getTask(w http.ResponseWriter, r *http.Request) {
	idStr := r.PathValue("id")
	id, err := strconv.Atoi(idStr)
	if err != nil {
		writeError(w, http.StatusBadRequest, "Ungueltige Task-ID")
		return
	}

	task, err := h.db.GetTask(id)
	if err != nil {
		writeError(w, http.StatusInternalServerError, "Fehler beim Laden")
		return
	}
	if task == nil {
		writeError(w, http.StatusNotFound, "Task nicht gefunden")
		return
	}

	writeJSON(w, http.StatusOK, task)
}

// POST /api/v1/tasks
func (h *Handler) createTask(hub *ws.Hub) http.HandlerFunc {
	return func(w http.ResponseWriter, r *http.Request) {
		var req struct {
			AgentID     string `json:"agent_id"`
			Action      string `json:"action"`
			ScheduledAt string `json:"scheduled_at"`
			WebhookURL  string `json:"webhook_url"`
		}
		if err := json.NewDecoder(r.Body).Decode(&req); err != nil {
			writeError(w, http.StatusBadRequest, "Ungueltige Anfrage")
			return
		}

		if req.AgentID == "" || req.Action == "" {
			writeError(w, http.StatusBadRequest, "agent_id und action sind erforderlich")
			return
		}

		// Validate action
		if req.Action != "backup" && req.Action != "update" {
			writeError(w, http.StatusBadRequest, "Ungueltige Aktion (backup, update)")
			return
		}

		// Check agent exists
		agent, _, err := h.db.GetAgent(req.AgentID)
		if err != nil || agent == nil {
			writeError(w, http.StatusNotFound, "Agent nicht gefunden")
			return
		}

		// Get user from context
		createdBy := "api-key"
		if claims, ok := r.Context().Value(UserContextKey).(*JWTClaims); ok {
			createdBy = claims.Username
		}

		task, err := h.db.CreateTask(req.AgentID, req.Action, req.ScheduledAt, req.WebhookURL, createdBy)
		if err != nil {
			log.Printf("Task erstellen fehlgeschlagen: %v", err)
			writeError(w, http.StatusInternalServerError, "Task erstellen fehlgeschlagen: "+err.Error())
			return
		}

		h.auditLog(r, "task.create", "task", strconv.Itoa(task.ID), agent.Name, req.Action)

		// If scheduled_at is in the past or now, trigger immediate execution
		if req.ScheduledAt == "" {
			// Already scheduled for now, scheduler will pick it up within 30s
		} else {
			schedTime, err := time.Parse(time.RFC3339, req.ScheduledAt)
			if err == nil && !schedTime.After(time.Now()) {
				// In the past — scheduler picks it up
			}
		}

		writeJSON(w, http.StatusCreated, task)
	}
}

// POST /api/v1/tasks/{id}/cancel
func (h *Handler) cancelTask(w http.ResponseWriter, r *http.Request) {
	idStr := r.PathValue("id")
	id, err := strconv.Atoi(idStr)
	if err != nil {
		writeError(w, http.StatusBadRequest, "Ungueltige Task-ID")
		return
	}

	if err := h.db.CancelTask(id); err != nil {
		writeError(w, http.StatusBadRequest, err.Error())
		return
	}

	h.auditLog(r, "task.cancel", "task", idStr, "", "")
	writeJSON(w, http.StatusOK, map[string]string{"message": "Task abgebrochen"})
}

// DELETE /api/v1/tasks/{id}
func (h *Handler) deleteTask(w http.ResponseWriter, r *http.Request) {
	idStr := r.PathValue("id")
	id, err := strconv.Atoi(idStr)
	if err != nil {
		writeError(w, http.StatusBadRequest, "Ungueltige Task-ID")
		return
	}

	if err := h.db.DeleteTask(id); err != nil {
		writeError(w, http.StatusBadRequest, err.Error())
		return
	}

	h.auditLog(r, "task.delete", "task", idStr, "", "")
	writeJSON(w, http.StatusOK, map[string]string{"message": "Task geloescht"})
}