package handlers

import (
	"fmt"
	"net/http"
	"strconv"

	"git.linuxforward.com/byop/byop-engine/models"
	"git.linuxforward.com/byop/byop-engine/services"
	"github.com/gin-gonic/gin"
)

// AppsHandler handles app-related operations
type AppsHandler struct {
	service *services.AppService
}

// NewAppsHandler creates a new AppsHandler
func NewAppsHandler(service *services.AppService) *AppsHandler {
	return &AppsHandler{
		service: service,
	}
}

// ListApps returns all apps with optional filtering
func (h *AppsHandler) ListApps(c *gin.Context) {
	filter := make(map[string]interface{})

	// Attempt to bind query parameters, but allow empty filters
	if err := c.ShouldBindQuery(&filter); err != nil && len(filter) > 0 {
		c.JSON(http.StatusBadRequest, gin.H{"error": "Invalid query parameters"})
		return
	}

	apps, err := h.service.ListApps(filter)
	if err != nil {
		c.JSON(http.StatusInternalServerError, gin.H{"error": fmt.Sprintf("Failed to list apps: %v", err)})
		return
	}

	c.JSON(http.StatusOK, apps)
}

// CreateApp creates a new deployment app
func (h *AppsHandler) CreateApp(c *gin.Context) {
	var app models.App

	if err := c.ShouldBindJSON(&app); err != nil {
		c.JSON(http.StatusBadRequest, gin.H{"error": fmt.Sprintf("Invalid request body: %v", err)})
		return
	}

	// Get the user ID from the context (set by auth middleware)
	userID, exists := c.Get("userID")
	if exists {
		app.CreatedBy = userID.(string)
	}

	if err := h.service.CreateApp(&app); err != nil {
		c.JSON(http.StatusInternalServerError, gin.H{"error": fmt.Sprintf("Failed to create app: %v", err)})
		return
	}

	c.JSON(http.StatusCreated, app)
}

// GetApp returns a specific app
func (h *AppsHandler) GetApp(c *gin.Context) {
	idStr := c.Param("id")
	id, err := strconv.ParseInt(idStr, 10, 64)
	if err != nil {
		c.JSON(http.StatusBadRequest, gin.H{"error": "Invalid app ID"})
		return
	}

	app, err := h.service.GetApp(id)
	if err != nil {
		c.JSON(http.StatusInternalServerError, gin.H{"error": fmt.Sprintf("Failed to fetch app: %v", err)})
		return
	}

	if app == nil {
		c.JSON(http.StatusNotFound, gin.H{"error": "App not found"})
		return
	}

	c.JSON(http.StatusOK, app)
}

// UpdateApp updates an app
func (h *AppsHandler) UpdateApp(c *gin.Context) {
	idStr := c.Param("id")
	id, err := strconv.ParseInt(idStr, 10, 64)
	if err != nil {
		c.JSON(http.StatusBadRequest, gin.H{"error": "Invalid app ID"})
		return
	}

	var updatedApp models.App
	if err := c.ShouldBindJSON(&updatedApp); err != nil {
		c.JSON(http.StatusBadRequest, gin.H{"error": fmt.Sprintf("Invalid request body: %v", err)})
		return
	}

	// Ensure the ID matches the URL parameter
	updatedApp.ID = id

	if err := h.service.UpdateApp(&updatedApp); err != nil {
		c.JSON(http.StatusInternalServerError, gin.H{"error": fmt.Sprintf("Failed to update app: %v", err)})
		return
	}

	c.JSON(http.StatusOK, updatedApp)
}

// DeleteApp deletes an app
func (h *AppsHandler) DeleteApp(c *gin.Context) {
	idStr := c.Param("id")
	id, err := strconv.ParseInt(idStr, 10, 64)
	if err != nil {
		c.JSON(http.StatusBadRequest, gin.H{"error": "Invalid app ID"})
		return
	}

	if err := h.service.DeleteApp(id); err != nil {
		c.JSON(http.StatusInternalServerError, gin.H{"error": fmt.Sprintf("Failed to delete app: %v", err)})
		return
	}

	c.Status(http.StatusNoContent)
}

// GetAppDeployments returns all deployments for an app
func (h *AppsHandler) GetAppDeployments(c *gin.Context) {
	idStr := c.Param("id")
	id, err := strconv.ParseInt(idStr, 10, 64)
	if err != nil {
		c.JSON(http.StatusBadRequest, gin.H{"error": "Invalid app ID"})
		return
	}

	deployments, err := h.service.GetAppDeployments(id)
	if err != nil {
		c.JSON(http.StatusInternalServerError, gin.H{"error": fmt.Sprintf("Failed to fetch app deployments: %v", err)})
		return
	}

	c.JSON(http.StatusOK, deployments)
}

// GetAppByVersion handles retrieval of an app by name and version
func (h *AppsHandler) GetAppByVersion(c *gin.Context) {
	name := c.Query("name")
	version := c.Query("version")

	if name == "" || version == "" {
		c.JSON(http.StatusBadRequest, gin.H{"error": "Both name and version parameters are required"})
		return
	}

	app, err := h.service.GetAppByVersion(name, version)
	if err != nil {
		c.JSON(http.StatusInternalServerError, gin.H{"error": fmt.Sprintf("Failed to fetch app: %v", err)})
		return
	}

	if app == nil {
		c.JSON(http.StatusNotFound, gin.H{"error": "App not found"})
		return
	}

	c.JSON(http.StatusOK, app)
}