package http

import (
	_ "embed"
	"encoding/json"
	"strings"
	"text/template"
	"time"

	"quyun/app/models"
	"quyun/app/requests"
	"quyun/database/schemas/public/model"
	"quyun/providers/wepay"

	"github.com/gofiber/fiber/v3"
	"github.com/gofiber/fiber/v3/log"
	"github.com/pkg/errors"
)

type ListQuery struct {
	Keyword *string `query:"keyword"`
}

// @provider
type posts struct {
	wepay *wepay.Client
}

// List posts
// @Router			/ [get]
// @Bind pagination query
// @Bind query query
// @Bind user local
func (ctl *posts) List(ctx fiber.Ctx, pagination *requests.Pagination, query *ListQuery, user *model.Users) (*requests.Pager, error) {
	cond := models.Posts.BuildConditionWithKey(query.Keyword)
	return models.Posts.List(ctx.Context(), pagination, cond)
}

// Show
// @Router			/show/:id [get]
// @Bind id path
func (ctl *posts) Show(ctx fiber.Ctx, id int64) (*model.Posts, error) {
	return models.Posts.GetByID(ctx.Context(), id)
}

// Mine posts
// @Router			/mine [get]
// @Bind pagination query
// @Bind query query
func (ctl *posts) Mine(ctx fiber.Ctx, pagination *requests.Pagination, query *ListQuery) (*requests.Pager, error) {
	log.Infof("Fetching posts for user with pagination: %+v and keyword: %v", pagination, query.Keyword)
	return models.Users.PostList(ctx.Context(), 1, pagination, query.Keyword)
}

//go:embed buy.html.tpl
var buyTpl string

// Buy
// @Router			/buy/:id [get]
// @Bind id path
func (ctl *posts) Buy(ctx fiber.Ctx, id int64) error {
	var userId int64 = 1

	user, err := models.Users.GetByID(ctx.Context(), userId)
	if err != nil {
		return errors.Wrapf(err, " failed to get user: %d", userId)
	}

	post, err := models.Posts.GetByID(ctx.Context(), id)
	if err != nil {
		return errors.Wrapf(err, " failed to get post: %d", id)
	}

	// create order
	order, err := models.Orders.Create(ctx.Context(), userId, post.ID)
	if err != nil {
		return errors.Wrap(err, "订单创建失败")
	}

	prePayResp, err := ctl.wepay.V3TransactionJsapi(ctx.Context(), func(bm *wepay.BodyMap) {
		bm.
			Expire(30 * time.Minute).
			Description(post.Title).
			OutTradeNo(order.OrderNo).
			Payer(user.OpenID)
	})
	if err != nil {
		log.Errorf("wepay.V3TransactionJsapi err: %v", err)
		return errors.Wrap(err, "微信支付失败")
	}

	signature, err := prePayResp.PaySignOfJSAPI()
	if err != nil {
		return errors.Wrap(err, "failed to get pay sign")
	}

	// render buyTpl with html/template
	tpl, err := template.New("buy").Parse(buyTpl)
	if err != nil {
		return errors.Wrap(err, "failed to parse template")
	}

	signatureBytes, err := json.Marshal(signature)
	if err != nil {
		return errors.Wrap(err, "failed to marshal signature")
	}

	var buf strings.Builder
	if err := tpl.Execute(&buf, map[string]interface{}{"signature": string(signatureBytes)}); err != nil {
		return errors.Wrap(err, "failed to execute template")
	}

	ctx.Set("Content-Type", "text/html; charset=utf-8")
	return ctx.SendString(buf.String())
}