package handlers

import (
	"database/sql"
	"net/http"

	"github.com/gin-gonic/gin"

	"admintemplate/internal/database"
	"admintemplate/internal/models"
)

type MenuHandler struct {
	db *database.DB
}

func NewMenuHandler(db *database.DB) *MenuHandler {
	return &MenuHandler{db: db}
}

// GetMenuItems returns all menu items organized in a tree structure
func (h *MenuHandler) GetMenuItems(c *gin.Context) {
	userRole := c.GetString("userRole")

	// Get all active menu items
	rows, err := h.db.Query(`
		SELECT id, parent_id, title, icon, route, sort_order, active, role_required
		FROM menu_items
		WHERE active = 1
		ORDER BY sort_order
	`)
	if err != nil {
		c.JSON(http.StatusInternalServerError, gin.H{"error": "Failed to fetch menu items"})
		return
	}
	defer rows.Close()

	var allItems []models.MenuItem
	for rows.Next() {
		var item models.MenuItem
		var parentID sql.NullInt64
		err := rows.Scan(&item.ID, &parentID, &item.Title, &item.Icon, &item.Route, &item.SortOrder, &item.Active, &item.RoleReq)
		if err != nil {
			continue
		}
		if parentID.Valid {
			item.ParentID = &parentID.Int64
		}

		// Filter by role
		if item.RoleReq != "" && item.RoleReq != userRole && userRole != "admin" {
			continue
		}

		allItems = append(allItems, item)
	}

	// Build tree structure
	menuTree := buildMenuTree(allItems, nil)
	c.JSON(http.StatusOK, menuTree)
}

// buildMenuTree creates a nested menu structure
func buildMenuTree(items []models.MenuItem, parentID *int64) []models.MenuItem {
	var result []models.MenuItem

	for _, item := range items {
		if (parentID == nil && item.ParentID == nil) ||
		   (parentID != nil && item.ParentID != nil && *parentID == *item.ParentID) {
			item.Children = buildMenuTree(items, &item.ID)
			result = append(result, item)
		}
	}

	return result
}

// GetToolbarItems returns all toolbar items
func (h *MenuHandler) GetToolbarItems(c *gin.Context) {
	rows, err := h.db.Query(`
		SELECT id, title, icon, action, shortcut, sort_order, active, separator
		FROM toolbar_items
		WHERE active = 1
		ORDER BY sort_order
	`)
	if err != nil {
		c.JSON(http.StatusInternalServerError, gin.H{"error": "Failed to fetch toolbar items"})
		return
	}
	defer rows.Close()

	var items []models.ToolbarItem
	for rows.Next() {
		var item models.ToolbarItem
		err := rows.Scan(&item.ID, &item.Title, &item.Icon, &item.Action, &item.Shortcut, &item.SortOrder, &item.Active, &item.Separator)
		if err != nil {
			continue
		}
		items = append(items, item)
	}

	c.JSON(http.StatusOK, items)
}

// GetUserSettings returns user settings
func (h *MenuHandler) GetUserSettings(c *gin.Context) {
	userID := c.GetInt64("userID")

	var settings models.UserSettings
	err := h.db.QueryRow(`
		SELECT id, user_id, sidebar_position, sidebar_collapsed, theme
		FROM user_settings
		WHERE user_id = ?
	`, userID).Scan(&settings.ID, &settings.UserID, &settings.SidebarPosition, &settings.SidebarCollapsed, &settings.Theme)

	if err == sql.ErrNoRows {
		// Return default settings
		settings = models.UserSettings{
			UserID:          userID,
			SidebarPosition: "left",
			SidebarCollapsed: false,
			Theme:           "light",
		}
	} else if err != nil {
		c.JSON(http.StatusInternalServerError, gin.H{"error": "Failed to fetch settings"})
		return
	}

	c.JSON(http.StatusOK, settings)
}

// UpdateUserSettings updates user settings
func (h *MenuHandler) UpdateUserSettings(c *gin.Context) {
	userID := c.GetInt64("userID")

	var req models.UpdateSettingsRequest
	if err := c.ShouldBindJSON(&req); err != nil {
		c.JSON(http.StatusBadRequest, gin.H{"error": err.Error()})
		return
	}

	// Check if settings exist
	var existingID int64
	err := h.db.QueryRow("SELECT id FROM user_settings WHERE user_id = ?", userID).Scan(&existingID)

	if err == sql.ErrNoRows {
		// Insert new settings
		position := "left"
		collapsed := false
		theme := "light"

		if req.SidebarPosition != nil {
			position = *req.SidebarPosition
		}
		if req.SidebarCollapsed != nil {
			collapsed = *req.SidebarCollapsed
		}
		if req.Theme != nil {
			theme = *req.Theme
		}

		_, err = h.db.Exec(`
			INSERT INTO user_settings (user_id, sidebar_position, sidebar_collapsed, theme)
			VALUES (?, ?, ?, ?)
		`, userID, position, collapsed, theme)
		if err != nil {
			c.JSON(http.StatusInternalServerError, gin.H{"error": "Failed to create settings"})
			return
		}
	} else if err != nil {
		c.JSON(http.StatusInternalServerError, gin.H{"error": "Failed to check settings"})
		return
	} else {
		// Update existing settings
		if req.SidebarPosition != nil {
			if _, err := h.db.Exec("UPDATE user_settings SET sidebar_position = ? WHERE user_id = ?", *req.SidebarPosition, userID); err != nil {
				c.JSON(http.StatusInternalServerError, gin.H{"error": "Failed to update sidebar position"})
				return
			}
		}
		if req.SidebarCollapsed != nil {
			if _, err := h.db.Exec("UPDATE user_settings SET sidebar_collapsed = ? WHERE user_id = ?", *req.SidebarCollapsed, userID); err != nil {
				c.JSON(http.StatusInternalServerError, gin.H{"error": "Failed to update sidebar collapsed"})
				return
			}
		}
		if req.Theme != nil {
			if _, err := h.db.Exec("UPDATE user_settings SET theme = ? WHERE user_id = ?", *req.Theme, userID); err != nil {
				c.JSON(http.StatusInternalServerError, gin.H{"error": "Failed to update theme"})
				return
			}
		}
	}

	// Return updated settings
	h.GetUserSettings(c)
}