package handlers

import (
	"net/http"
	"time"

	"github.com/flatrender/render-svc/internal/db"
	"github.com/flatrender/render-svc/internal/models"
	"github.com/gin-gonic/gin"
	"github.com/google/uuid"
)

type NodeHandler struct {
	store *db.Store
}

func NewNodeHandler(store *db.Store) *NodeHandler {
	return &NodeHandler{store: store}
}

// GET /v1/nodes
func (h *NodeHandler) List(c *gin.Context) {
	region := c.Query("region")
	status := c.Query("status")
	nodes, err := h.store.ListNodes(c.Request.Context(), region, status)
	if err != nil {
		c.JSON(http.StatusInternalServerError, models.APIError{Code: "internal_error", Message: err.Error()})
		return
	}
	if nodes == nil {
		nodes = []*models.RenderNode{}
	}
	c.JSON(http.StatusOK, gin.H{"data": nodes})
}

// POST /v1/nodes
func (h *NodeHandler) Create(c *gin.Context) {
	var req models.NodeCreateRequest
	if err := c.ShouldBindJSON(&req); err != nil {
		c.JSON(http.StatusBadRequest, models.APIError{Code: "bad_request", Message: err.Error()})
		return
	}
	node, err := h.store.CreateNode(c.Request.Context(), &req)
	if err != nil {
		c.JSON(http.StatusInternalServerError, models.APIError{Code: "internal_error", Message: err.Error()})
		return
	}
	c.JSON(http.StatusCreated, node)
}

// GET /v1/nodes/:node_id
func (h *NodeHandler) Get(c *gin.Context) {
	nodeID, err := uuid.Parse(c.Param("node_id"))
	if err != nil {
		c.JSON(http.StatusBadRequest, models.APIError{Code: "bad_request", Message: "invalid node_id"})
		return
	}
	node, err := h.store.GetNodeByID(c.Request.Context(), nodeID)
	if err != nil {
		c.JSON(http.StatusNotFound, models.APIError{Code: "not_found", Message: err.Error()})
		return
	}
	c.JSON(http.StatusOK, node)
}

// PATCH /v1/nodes/:node_id
func (h *NodeHandler) Patch(c *gin.Context) {
	nodeID, err := uuid.Parse(c.Param("node_id"))
	if err != nil {
		c.JSON(http.StatusBadRequest, models.APIError{Code: "bad_request", Message: "invalid node_id"})
		return
	}
	var req models.NodePatchRequest
	if err := c.ShouldBindJSON(&req); err != nil {
		c.JSON(http.StatusBadRequest, models.APIError{Code: "bad_request", Message: err.Error()})
		return
	}
	node, err := h.store.PatchNode(c.Request.Context(), nodeID, &req)
	if err != nil {
		c.JSON(http.StatusInternalServerError, models.APIError{Code: "internal_error", Message: err.Error()})
		return
	}
	c.JSON(http.StatusOK, node)
}

// POST /v1/nodes/:node_id/restart — Stub: in production this calls the node agent
func (h *NodeHandler) Restart(c *gin.Context) {
	_, err := uuid.Parse(c.Param("node_id"))
	if err != nil {
		c.JSON(http.StatusBadRequest, models.APIError{Code: "bad_request", Message: "invalid node_id"})
		return
	}
	c.Status(http.StatusAccepted)
}

// POST /v1/nodes/:node_id/release
func (h *NodeHandler) Release(c *gin.Context) {
	nodeID, err := uuid.Parse(c.Param("node_id"))
	if err != nil {
		c.JSON(http.StatusBadRequest, models.APIError{Code: "bad_request", Message: "invalid node_id"})
		return
	}
	if err := h.store.ReleaseNode(c.Request.Context(), nodeID); err != nil {
		c.JSON(http.StatusInternalServerError, models.APIError{Code: "internal_error", Message: err.Error()})
		return
	}
	c.Status(http.StatusNoContent)
}

// DELETE /v1/nodes/:node_id
func (h *NodeHandler) Delete(c *gin.Context) {
	nodeID, err := uuid.Parse(c.Param("node_id"))
	if err != nil {
		c.JSON(http.StatusBadRequest, models.APIError{Code: "bad_request", Message: "invalid node_id"})
		return
	}
	if err := h.store.DeleteNode(c.Request.Context(), nodeID); err != nil {
		c.JSON(http.StatusInternalServerError, models.APIError{Code: "internal_error", Message: err.Error()})
		return
	}
	c.Status(http.StatusNoContent)
}

// POST /v1/nodes/:node_id/close-ae — Stub: signals the node agent to kill AE process
func (h *NodeHandler) CloseAE(c *gin.Context) {
	_, err := uuid.Parse(c.Param("node_id"))
	if err != nil {
		c.JSON(http.StatusBadRequest, models.APIError{Code: "bad_request", Message: "invalid node_id"})
		return
	}
	c.Status(http.StatusNoContent)
}

// GET /v1/nodes/:node_id/health
func (h *NodeHandler) Health(c *gin.Context) {
	nodeID, err := uuid.Parse(c.Param("node_id"))
	if err != nil {
		c.JSON(http.StatusBadRequest, models.APIError{Code: "bad_request", Message: "invalid node_id"})
		return
	}
	node, err := h.store.GetNodeByID(c.Request.Context(), nodeID)
	if err != nil {
		c.JSON(http.StatusNotFound, models.APIError{Code: "not_found", Message: err.Error()})
		return
	}
	c.JSON(http.StatusOK, gin.H{
		"node_id":          node.ID,
		"recorded_at":      node.LastHeartbeatAt,
		"status":           node.Status,
		"cpu_pct":          node.LastCPUPct,
		"ram_available_mb": node.LastRAMAvailableMB,
		"ae_running":       node.AERunning,
		"current_job_id":   node.CurrentJobID,
		"cache_used_gb":    node.CacheUsedGB,
	})
}

// GET /v1/nodes/:node_id/health/history
func (h *NodeHandler) HealthHistory(c *gin.Context) {
	nodeID, err := uuid.Parse(c.Param("node_id"))
	if err != nil {
		c.JSON(http.StatusBadRequest, models.APIError{Code: "bad_request", Message: "invalid node_id"})
		return
	}
	fromStr := c.Query("from")
	toStr := c.Query("to")
	from := time.Now().Add(-24 * time.Hour)
	to := time.Now()
	if fromStr != "" {
		if t, err := time.Parse(time.RFC3339, fromStr); err == nil {
			from = t
		}
	}
	if toStr != "" {
		if t, err := time.Parse(time.RFC3339, toStr); err == nil {
			to = t
		}
	}
	logs, err := h.store.ListNodeHealthHistory(c.Request.Context(), nodeID, from, to)
	if err != nil {
		c.JSON(http.StatusInternalServerError, models.APIError{Code: "internal_error", Message: err.Error()})
		return
	}
	if logs == nil {
		logs = []*models.NodeHealthLog{}
	}
	c.JSON(http.StatusOK, gin.H{"data": logs})
}

// GET /v1/nodes/:node_id/crashes
func (h *NodeHandler) Crashes(c *gin.Context) {
	nodeID, err := uuid.Parse(c.Param("node_id"))
	if err != nil {
		c.JSON(http.StatusBadRequest, models.APIError{Code: "bad_request", Message: "invalid node_id"})
		return
	}
	crashes, err := h.store.ListNodeCrashes(c.Request.Context(), nodeID)
	if err != nil {
		c.JSON(http.StatusInternalServerError, models.APIError{Code: "internal_error", Message: err.Error()})
		return
	}
	if crashes == nil {
		crashes = []*models.NodeCrash{}
	}
	c.JSON(http.StatusOK, gin.H{"data": crashes})
}

// GET /v1/node-updates
func (h *NodeHandler) ListUpdates(c *gin.Context) {
	updates, err := h.store.ListNodeUpdates(c.Request.Context())
	if err != nil {
		c.JSON(http.StatusInternalServerError, models.APIError{Code: "internal_error", Message: err.Error()})
		return
	}
	if updates == nil {
		updates = []*models.NodeUpdate{}
	}
	c.JSON(http.StatusOK, gin.H{"data": updates})
}

// POST /v1/node-updates/:update_id/rollout
func (h *NodeHandler) Rollout(c *gin.Context) {
	updateID, err := uuid.Parse(c.Param("update_id"))
	if err != nil {
		c.JSON(http.StatusBadRequest, models.APIError{Code: "bad_request", Message: "invalid update_id"})
		return
	}
	var body struct {
		NodeIDs []uuid.UUID `json:"node_ids"`
	}
	if err := c.ShouldBindJSON(&body); err != nil {
		c.JSON(http.StatusBadRequest, models.APIError{Code: "bad_request", Message: err.Error()})
		return
	}
	if err := h.store.QueueUpdateRollout(c.Request.Context(), updateID, body.NodeIDs); err != nil {
		c.JSON(http.StatusInternalServerError, models.APIError{Code: "internal_error", Message: err.Error()})
		return
	}
	c.Status(http.StatusAccepted)
}