package handlers

import (
	"net/http"
	"strconv"

	"oidc-oauth2-server/services"

	"github.com/gin-contrib/sessions"
	"github.com/gin-gonic/gin"
)

type AdminHandler struct {
	adminService *services.AdminService
}

func NewAdminHandler(adminService *services.AdminService) *AdminHandler {
	return &AdminHandler{adminService: adminService}
}

func (h *AdminHandler) ShowAdminLogin(c *gin.Context) {
	c.HTML(http.StatusOK, "admin_login.html", gin.H{})
}

func (h *AdminHandler) HandleAdminLogin(c *gin.Context) {
	username := c.PostForm("username")
	password := c.PostForm("password")

	admin, err := h.adminService.Authenticate(username, password)
	if err != nil {
		c.HTML(http.StatusBadRequest, "admin_login.html", gin.H{
			"error": "Invalid credentials",
		})
		return
	}

	session := sessions.Default(c)
	session.Set("admin_id", admin.ID)
	session.Save()

	c.Redirect(http.StatusFound, "/admin/dashboard")
}

func (h *AdminHandler) Dashboard(c *gin.Context) {
	c.HTML(http.StatusOK, "admin_dashboard.html", gin.H{})
}

func (h *AdminHandler) ListUsers(c *gin.Context) {
	page, _ := strconv.Atoi(c.DefaultQuery("page", "1"))
	pageSize, _ := strconv.Atoi(c.DefaultQuery("page_size", "10"))

	users, total, err := h.adminService.ListUsers(page, pageSize)
	if err != nil {
		c.JSON(http.StatusInternalServerError, gin.H{"error": err.Error()})
		return
	}

	c.HTML(http.StatusOK, "admin_users.html", gin.H{
		"users":    users,
		"total":    total,
		"page":     page,
		"pageSize": pageSize,
	})
}

func (h *AdminHandler) ListClients(c *gin.Context) {
	page, _ := strconv.Atoi(c.DefaultQuery("page", "1"))
	pageSize, _ := strconv.Atoi(c.DefaultQuery("page_size", "10"))

	clients, total, err := h.adminService.ListClients(page, pageSize)
	if err != nil {
		c.JSON(http.StatusInternalServerError, gin.H{"error": err.Error()})
		return
	}

	c.HTML(http.StatusOK, "admin_clients.html", gin.H{
		"clients":  clients,
		"total":    total,
		"page":     page,
		"pageSize": pageSize,
	})
}