package handlers

import (
	"encoding/json"
	"fmt"
	"net/http"
	"strconv"
	"time"

	"github.com/gin-gonic/gin"

	"airwallex-admin/models"
	"airwallex-admin/services"
)

func ListCards(c *gin.Context) {
	pageNum, _ := strconv.Atoi(c.DefaultQuery("page_num", "0"))
	pageSize, _ := strconv.Atoi(c.DefaultQuery("page_size", "20"))
	cardholderID := c.Query("cardholder_id")
	status := c.Query("status")

	result, err := services.ListCards(models.DB, pageNum, pageSize, cardholderID, status)
	if err != nil {
		c.JSON(http.StatusBadRequest, gin.H{"detail": err.Error()})
		return
	}

	c.JSON(http.StatusOK, result)
}

func CreateCard(c *gin.Context) {
	var body map[string]interface{}
	if err := c.ShouldBindJSON(&body); err != nil {
		c.JSON(http.StatusBadRequest, gin.H{"detail": "Invalid request body"})
		return
	}

	// Check daily card limit
	dailyLimit := 100
	if v := models.GetSetting(models.DB, "daily_card_limit"); v != "" {
		if n, err := strconv.Atoi(v); err == nil {
			dailyLimit = n
		}
	}

	todayStart := time.Now().UTC().Truncate(24 * time.Hour)
	var todayCount int64
	models.DB.Model(&models.CardLog{}).
		Where("action = ? AND status = ? AND created_at >= ?", "create_card", "success", todayStart).
		Count(&todayCount)

	if int(todayCount) >= dailyLimit {
		c.JSON(http.StatusBadRequest, gin.H{"detail": "Daily card creation limit reached"})
		return
	}

	username := c.GetString("username")
	reqData, _ := json.Marshal(body)

	result, err := services.CreateCard(models.DB, body)
	if err != nil {
		respData, _ := json.Marshal(map[string]string{"error": err.Error()})
		models.DB.Create(&models.CardLog{
			Action:       "create_card",
			Status:       "failed",
			Operator:     username,
			RequestData:  string(reqData),
			ResponseData: string(respData),
		})
		c.JSON(http.StatusBadRequest, gin.H{"detail": err.Error()})
		return
	}

	cardID, _ := result["card_id"].(string)
	cardholderID, _ := result["cardholder_id"].(string)
	respData, _ := json.Marshal(result)

	models.DB.Create(&models.CardLog{
		CardID:       cardID,
		CardholderID: cardholderID,
		Action:       "create_card",
		Status:       "success",
		Operator:     username,
		RequestData:  string(reqData),
		ResponseData: string(respData),
	})
	models.DB.Create(&models.AuditLog{
		Action:       "create_card",
		ResourceType: "card",
		ResourceID:   cardID,
		Operator:     username,
		IPAddress:    c.ClientIP(),
		Details:      fmt.Sprintf("Created card %s", cardID),
	})

	c.JSON(http.StatusOK, result)
}

func GetCard(c *gin.Context) {
	cardID := c.Param("id")
	result, err := services.GetCard(models.DB, cardID)
	if err != nil {
		c.JSON(http.StatusBadRequest, gin.H{"detail": err.Error()})
		return
	}
	c.JSON(http.StatusOK, result)
}

func GetCardDetails(c *gin.Context) {
	cardID := c.Param("id")
	result, err := services.GetCardDetails(models.DB, cardID)
	if err != nil {
		c.JSON(http.StatusBadRequest, gin.H{"detail": err.Error()})
		return
	}

	username := c.GetString("username")
	models.DB.Create(&models.AuditLog{
		Action:       "view_card_details",
		ResourceType: "card",
		ResourceID:   cardID,
		Operator:     username,
		IPAddress:    c.ClientIP(),
	})

	c.JSON(http.StatusOK, result)
}

func UpdateCard(c *gin.Context) {
	cardID := c.Param("id")

	var body map[string]interface{}
	if err := c.ShouldBindJSON(&body); err != nil {
		c.JSON(http.StatusBadRequest, gin.H{"detail": "Invalid request body"})
		return
	}

	result, err := services.UpdateCard(models.DB, cardID, body)
	if err != nil {
		c.JSON(http.StatusBadRequest, gin.H{"detail": err.Error()})
		return
	}

	username := c.GetString("username")
	models.DB.Create(&models.AuditLog{
		Action:       "update_card",
		ResourceType: "card",
		ResourceID:   cardID,
		Operator:     username,
		IPAddress:    c.ClientIP(),
	})

	c.JSON(http.StatusOK, result)
}