package controllers

import (
	"math"
	"strconv"

	"doormile/db"
	"doormile/dto"
	"doormile/models"
	"doormile/utils"

	"github.com/gofiber/fiber/v2"
)

// Customer profile and saved addresses.
//
// The rest of the customer surface — auth, catalogue, estimate, bookings,
// tracking, places, devices — lives in the cx*Controller.go files and answers
// in the customer envelope (utils.CxOK / utils.CxFail). The PIN login,
// single-destination booking create/list/detail/cancel and the /customer/track
// read that used to live here were replaced by that surface, not moved: a
// customer books a pickup with 1..N destinations now, and there is no shape in
// which the old single-address request is still a valid booking.

func calculateDistance(lat1, lon1, lat2, lon2 float64) float64 {
	const R = 6371.0
	dLat := (lat2 - lat1) * math.Pi / 180.0
	dLon := (lon2 - lon1) * math.Pi / 180.0
	a := math.Sin(dLat/2)*math.Sin(dLat/2) +
		math.Cos(lat1*math.Pi/180.0)*math.Cos(lat2*math.Pi/180.0)*
			math.Sin(dLon/2)*math.Sin(dLon/2)
	c := 2 * math.Atan2(math.Sqrt(a), math.Sqrt(1-a))
	return R * c
}

func calculateVolumetricWeight(length, width, height float64) float64 {
	return (length * width * height) / 5000.0
}

func GetCustomerProfile(c *fiber.Ctx) error {
	customerID := c.Locals("userid").(int)

	var customer models.AppCustomer
	if err := db.DB.First(&customer, customerID).Error; err != nil {
		return utils.CxNotFound(c, "We could not find your profile")
	}

	return utils.CxOK(c, renderCustomer(&customer))
}

func UpdateCustomerProfile(c *fiber.Ctx) error {
	customerID := c.Locals("userid").(int)

	var customer models.AppCustomer
	if err := db.DB.First(&customer, customerID).Error; err != nil {
		return utils.CxNotFound(c, "We could not find your profile")
	}

	// Pointer fields: an omitted key leaves the stored value alone, an explicit
	// value overwrites it. The previous version cleared email and lastname on
	// every call that did not resend them, which quietly wiped a customer's
	// email the first time they edited their name.
	var req struct {
		Name             *string  `json:"name"`
		Email            *string  `json:"email"`
		Defaultlatitude  *float64 `json:"defaultLatitude"`
		Defaultlongitude *float64 `json:"defaultLongitude"`
		Defaultpincode   *string  `json:"defaultPincode"`
	}
	if err := c.BodyParser(&req); err != nil {
		return utils.CxBadRequest(c, "We could not read that request")
	}

	if req.Name != nil {
		first, last := splitName(*req.Name)
		if first == "" {
			return utils.CxFail(c, fiber.StatusBadRequest, utils.CxErrInvalidName, "Enter your full name")
		}
		customer.Firstname, customer.Lastname = first, last
	}
	if req.Email != nil {
		customer.Email = *req.Email
	}
	if req.Defaultlatitude != nil {
		customer.Defaultlatitude = *req.Defaultlatitude
	}
	if req.Defaultlongitude != nil {
		customer.Defaultlongitude = *req.Defaultlongitude
	}
	if req.Defaultpincode != nil {
		customer.Defaultpincode = *req.Defaultpincode
	}

	if err := db.DB.Save(&customer).Error; err != nil {
		utils.Error("UpdateCustomerProfile: save failed", "customer_id", customerID, "error", err)
		return utils.CxInternal(c)
	}

	return utils.CxOK(c, renderCustomer(&customer))
}

func GetCustomerLocations(c *fiber.Ctx) error {
	customerID := c.Locals("userid").(int)

	var locations []models.AppCustomerLocation
	if err := db.DB.Where("appcustomerid = ? AND status = ?", customerID, "Active").
		Order("isdefault DESC, appcustomerlocationid DESC").Find(&locations).Error; err != nil {
		utils.Error("GetCustomerLocations: query failed", "customer_id", customerID, "error", err)
		return utils.CxInternal(c)
	}

	out := make([]fiber.Map, 0, len(locations))
	for i := range locations {
		out = append(out, renderSavedAddress(&locations[i]))
	}
	return utils.CxList(c, out, len(out), nil)
}

func CreateCustomerLocation(c *fiber.Ctx) error {
	customerID := c.Locals("userid").(int)

	var count int64
	db.DB.Model(&models.AppCustomerLocation{}).
		Where("appcustomerid = ? AND status = ?", customerID, "Active").Count(&count)
	if count >= 10 {
		return utils.CxBadRequest(c, "You can save up to 10 addresses")
	}

	req := new(dto.LocationCreateRequest)
	if err := c.BodyParser(req); err != nil {
		return utils.CxBadRequest(c, "We could not read that request")
	}

	if req.Address == "" || req.Pincode == "" || req.Latitude == 0 || req.Longitude == 0 {
		return utils.CxBadRequest(c, "An address needs a street, a pincode and a map location")
	}

	if req.Isdefault {
		db.DB.Model(&models.AppCustomerLocation{}).
			Where("appcustomerid = ?", customerID).Update("isdefault", false)
	}

	location := models.AppCustomerLocation{
		Appcustomerid: customerID,
		Label:         req.Label,
		Receivername:  req.Receivername,
		Receiverphone: req.Receiverphone,
		Address:       req.Address,
		Landmark:      req.Landmark,
		City:          req.City,
		State:         req.State,
		Pincode:       req.Pincode,
		Latitude:      req.Latitude,
		Longitude:     req.Longitude,
		Isdefault:     req.Isdefault,
		Status:        "Active",
	}

	if err := db.DB.Create(&location).Error; err != nil {
		utils.Error("CreateCustomerLocation: insert failed", "customer_id", customerID, "error", err)
		return utils.CxInternal(c)
	}

	return utils.CxCreated(c, renderSavedAddress(&location))
}

func UpdateCustomerLocation(c *fiber.Ctx) error {
	customerID := c.Locals("userid").(int)
	locationID, err := strconv.Atoi(c.Params("id"))
	if err != nil {
		return utils.CxBadRequest(c, "That address could not be found")
	}

	var location models.AppCustomerLocation
	if err := db.DB.Where("appcustomerlocationid = ? AND appcustomerid = ?", locationID, customerID).
		First(&location).Error; err != nil {
		return utils.CxNotFound(c, "That address could not be found")
	}

	req := new(dto.LocationCreateRequest)
	if err := c.BodyParser(req); err != nil {
		return utils.CxBadRequest(c, "We could not read that request")
	}

	if req.Label != "" {
		location.Label = req.Label
	}
	location.Receivername = req.Receivername
	location.Receiverphone = req.Receiverphone
	if req.Address != "" {
		location.Address = req.Address
	}
	location.Landmark = req.Landmark
	location.City = req.City
	location.State = req.State
	if req.Pincode != "" {
		location.Pincode = req.Pincode
	}
	if req.Latitude != 0 {
		location.Latitude = req.Latitude
	}
	if req.Longitude != 0 {
		location.Longitude = req.Longitude
	}
	location.Isdefault = req.Isdefault

	if req.Isdefault {
		db.DB.Model(&models.AppCustomerLocation{}).
			Where("appcustomerid = ?", customerID).Update("isdefault", false)
	}

	if err := db.DB.Save(&location).Error; err != nil {
		utils.Error("UpdateCustomerLocation: save failed", "location_id", locationID, "error", err)
		return utils.CxInternal(c)
	}

	return utils.CxOK(c, renderSavedAddress(&location))
}

func DeleteCustomerLocation(c *fiber.Ctx) error {
	customerID := c.Locals("userid").(int)
	locationID, err := strconv.Atoi(c.Params("id"))
	if err != nil {
		return utils.CxBadRequest(c, "That address could not be found")
	}

	var location models.AppCustomerLocation
	if err := db.DB.Where("appcustomerlocationid = ? AND appcustomerid = ?", locationID, customerID).
		First(&location).Error; err != nil {
		return utils.CxNotFound(c, "That address could not be found")
	}

	location.Status = "InActive"
	if err := db.DB.Save(&location).Error; err != nil {
		utils.Error("DeleteCustomerLocation: save failed", "location_id", locationID, "error", err)
		return utils.CxInternal(c)
	}

	return utils.CxOK(c, fiber.Map{"id": strconv.Itoa(location.Appcustomerlocationid), "deleted": true})
}

// renderSavedAddress is the one shape a saved address is returned in, matching
// the two-line title/sub the pickup search and the booking pickup block use —
// so an address picked from Saved and one picked from search are the same
// object to the client.
func renderSavedAddress(l *models.AppCustomerLocation) fiber.Map {
	title := l.Label
	if title == "" {
		title = l.Address
	}
	return fiber.Map{
		"id":             strconv.Itoa(l.Appcustomerlocationid),
		"label":          l.Label,
		"title":          title,
		"sub":            joinNonEmpty(", ", l.Address, l.Landmark, l.City, l.Pincode),
		"recipientName":  l.Receivername,
		"recipientPhone": l.Receiverphone,
		"lat":            l.Latitude,
		"lng":            l.Longitude,
		"isDefault":      l.Isdefault,
	}
}