package admin

import (
	"gobeyhan/app/settings/services"
	"gobeyhan/database/models"
	"gobeyhan/views/admin/settings" // We will create this package
	"net/http"
	"strconv"

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

type SettingsHandler struct {
	service *services.SettingsService
}

func NewSettingsHandler() *SettingsHandler {
	return &SettingsHandler{
		service: services.NewSettingsService(),
	}
}

// ==================== WHITELIST ====================

func (h *SettingsHandler) ListWhitelist(c *gin.Context) {
	items, err := h.service.GetAllCorsWhitelist()
	if err != nil {
		c.String(http.StatusInternalServerError, "Error fetching whitelist")
		return
	}
	settings.WhitelistList(items).Render(c.Request.Context(), c.Writer)
}

func (h *SettingsHandler) NewWhitelist(c *gin.Context) {
	settings.WhitelistCreate(nil).Render(c.Request.Context(), c.Writer)
}

func (h *SettingsHandler) CreateWhitelist(c *gin.Context) {
	origin := c.PostForm("origin")
	description := c.PostForm("description")

	// Basic Validation
	errors := make(map[string]string)
	if origin == "" {
		errors["origin"] = "Origin is required"
	}

	if len(errors) > 0 {
		settings.WhitelistCreate(errors).Render(c.Request.Context(), c.Writer)
		return
	}

	item := &models.CorsWhitelist{
		Origin:      origin,
		Description: description,
		IsActive:    true,
	}

	if err := h.service.CreateCorsWhitelist(item); err != nil {
		errors["origin"] = "Error creating whitelist entry: " + err.Error()
		settings.WhitelistCreate(errors).Render(c.Request.Context(), c.Writer)
		return
	}

	c.Redirect(http.StatusSeeOther, "/admin/settings/whitelist")
}

func (h *SettingsHandler) EditWhitelist(c *gin.Context) {
	idStr := c.Param("id")
	id, err := strconv.ParseUint(idStr, 10, 64)
	if err != nil {
		c.String(http.StatusBadRequest, "Invalid ID")
		return
	}

	item, err := h.service.GetCorsWhitelistByID(id)
	if err != nil {
		c.String(http.StatusNotFound, "Item not found")
		return
	}

	settings.WhitelistEdit(item, nil).Render(c.Request.Context(), c.Writer)
}

func (h *SettingsHandler) UpdateWhitelist(c *gin.Context) {
	id := c.Param("id")
	origin := c.PostForm("origin")
	description := c.PostForm("description")

	// Basic Validation
	errors := make(map[string]string)
	if origin == "" {
		errors["origin"] = "Origin is required"
	}

	if len(errors) > 0 {
		// Fetch item again to display form with errors
		idUint, _ := strconv.ParseUint(id, 10, 64)
		item, _ := h.service.GetCorsWhitelistByID(idUint)
		if item == nil {
			c.String(http.StatusNotFound, "Item not found")
			return
		}
		// Preserve user input
		item.Origin = origin
		item.Description = description
		settings.WhitelistEdit(item, errors).Render(c.Request.Context(), c.Writer)
		return
	}

	updates := map[string]interface{}{
		"origin":      origin,
		"description": description,
	}

	if err := h.service.UpdateCorsWhitelist(id, updates); err != nil {
		idUint, _ := strconv.ParseUint(id, 10, 64)
		item, _ := h.service.GetCorsWhitelistByID(idUint)
		settings.WhitelistEdit(item, map[string]string{"origin": "Error updating: " + err.Error()}).Render(c.Request.Context(), c.Writer)
		return
	}

	c.Redirect(http.StatusSeeOther, "/admin/settings/whitelist")
}

func (h *SettingsHandler) DeleteWhitelist(c *gin.Context) {
	id := c.Param("id")
	if err := h.service.DeleteCorsWhitelist(id); err != nil { // Service takes string ID
		c.String(http.StatusInternalServerError, "Error deleting item")
		return
	}
	c.Redirect(http.StatusSeeOther, "/admin/settings/whitelist")
}

// ==================== BLACKLIST ====================

func (h *SettingsHandler) ListBlacklist(c *gin.Context) {
	items, err := h.service.GetAllCorsBlacklist()
	if err != nil {
		c.String(http.StatusInternalServerError, "Error fetching blacklist")
		return
	}
	settings.BlacklistList(items).Render(c.Request.Context(), c.Writer)
}

func (h *SettingsHandler) NewBlacklist(c *gin.Context) {
	settings.BlacklistCreate(nil).Render(c.Request.Context(), c.Writer)
}

func (h *SettingsHandler) CreateBlacklist(c *gin.Context) {
	origin := c.PostForm("origin")
	description := c.PostForm("description")

	errors := make(map[string]string)
	if origin == "" {
		errors["origin"] = "Origin is required"
	}

	if len(errors) > 0 {
		settings.BlacklistCreate(errors).Render(c.Request.Context(), c.Writer)
		return
	}

	item := &models.CorsBlacklist{
		Origin:   origin,
		Reason:   description,
		IsActive: true,
	}

	if err := h.service.CreateCorsBlacklist(item); err != nil {
		errors["origin"] = "Error creating entry: " + err.Error()
		settings.BlacklistCreate(errors).Render(c.Request.Context(), c.Writer)
		return
	}

	c.Redirect(http.StatusSeeOther, "/admin/settings/blacklist")
}

func (h *SettingsHandler) DeleteBlacklist(c *gin.Context) {
	id := c.Param("id")
	if err := h.service.DeleteCorsBlacklist(id); err != nil {
		c.String(http.StatusInternalServerError, "Error deleting item")
		return
	}
	c.Redirect(http.StatusSeeOther, "/admin/settings/blacklist")
}

func (h *SettingsHandler) EditBlacklist(c *gin.Context) {
	idStr := c.Param("id")
	id, err := strconv.ParseUint(idStr, 10, 64)
	if err != nil {
		c.String(http.StatusBadRequest, "Invalid ID")
		return
	}

	item, err := h.service.GetCorsBlacklistByID(id)
	if err != nil {
		c.String(http.StatusNotFound, "Item not found")
		return
	}

	settings.BlacklistEdit(item, nil).Render(c.Request.Context(), c.Writer)
}

func (h *SettingsHandler) UpdateBlacklist(c *gin.Context) {
	id := c.Param("id")
	origin := c.PostForm("origin")
	reason := c.PostForm("reason")

	errors := make(map[string]string)
	if origin == "" {
		errors["origin"] = "Origin is required"
	}

	if len(errors) > 0 {
		idUint, _ := strconv.ParseUint(id, 10, 64)
		item, _ := h.service.GetCorsBlacklistByID(idUint)
		if item == nil {
			c.String(http.StatusNotFound, "Item not found")
			return
		}
		item.Origin = origin
		item.Reason = reason
		settings.BlacklistEdit(item, errors).Render(c.Request.Context(), c.Writer)
		return
	}

	updates := map[string]interface{}{
		"origin": origin,
		"reason": reason,
	}

	if err := h.service.UpdateCorsBlacklist(id, updates); err != nil {
		idUint, _ := strconv.ParseUint(id, 10, 64)
		item, _ := h.service.GetCorsBlacklistByID(idUint)
		settings.BlacklistEdit(item, map[string]string{"origin": "Error updating: " + err.Error()}).Render(c.Request.Context(), c.Writer)
		return
	}

	c.Redirect(http.StatusSeeOther, "/admin/settings/blacklist")
}

// ==================== RATE LIMITS ====================

func (h *SettingsHandler) ListRateLimits(c *gin.Context) {
	items, err := h.service.GetAllRateLimitSettings()
	if err != nil {
		c.String(http.StatusInternalServerError, "Error fetching rate limits")
		return
	}
	settings.RateLimitList(items).Render(c.Request.Context(), c.Writer)
}

func (h *SettingsHandler) EditRateLimit(c *gin.Context) {
	idStr := c.Param("id")
	id, err := strconv.ParseUint(idStr, 10, 64)
	if err != nil {
		c.String(http.StatusBadRequest, "Invalid ID")
		return
	}

	item, err := h.service.GetRateLimitSettingByID(id)
	if err != nil {
		c.String(http.StatusNotFound, "Item not found")
		return
	}

	settings.RateLimitEdit(item, nil).Render(c.Request.Context(), c.Writer)
}

func (h *SettingsHandler) UpdateRateLimit(c *gin.Context) {
	id := c.Param("id")
	limitStr := c.PostForm("max_requests")
	windowStr := c.PostForm("window_seconds")
	description := c.PostForm("description")

	limit, _ := strconv.ParseInt(limitStr, 10, 64)
	window, _ := strconv.Atoi(windowStr)

	updates := map[string]interface{}{
		"description": description,
	}
	if limit > 0 {
		updates["max_requests"] = limit
	}
	if window > 0 {
		updates["window_seconds"] = window
	}

	if err := h.service.UpdateRateLimitSetting(id, updates); err != nil {
		// Handle error (redisplay form)
		idUint, _ := strconv.ParseUint(id, 10, 64)
		item, _ := h.service.GetRateLimitSettingByID(idUint)
		settings.RateLimitEdit(item, map[string]string{"general": "Error updating: " + err.Error()}).Render(c.Request.Context(), c.Writer)
		return
	}

	c.Redirect(http.StatusSeeOther, "/admin/settings/rate-limits")
}

func (h *SettingsHandler) DeleteRateLimit(c *gin.Context) {
	id := c.Param("id")
	if err := h.service.DeleteRateLimitSetting(id); err != nil {
		c.String(http.StatusInternalServerError, "Error deleting item")
		return
	}
	c.Redirect(http.StatusSeeOther, "/admin/settings/rate-limits")
}