package api

import (
	"fmt"
	"net/http"
	"strconv"
	"strings"

	"github.com/gin-gonic/gin"

	_ "oci-portal/internal/oci" // swagger 注解引用
)

// payInvoiceRequest 是付款请求体;email 接收 OSP 付款回执。
type payInvoiceRequest struct {
	Email string `json:"email" binding:"required"`
}

// @Summary  发票列表
// @Tags     账单
// @Param    id path int true "配置 ID"
// @Param    year query int false "自然年过滤(按开票时间);缺省全量"
// @Success  200 {array} oci.Invoice
// @Security BearerAuth
// @Router   /api/v1/oci-configs/{id}/invoices [get]
func (h *ociConfigHandler) invoices(c *gin.Context) {
	id, ok := pathID(c)
	if !ok {
		return
	}
	year, _ := strconv.Atoi(c.Query("year"))
	list, err := h.svc.Invoices(c.Request.Context(), id, year)
	if err != nil {
		respondError(c, err)
		return
	}
	c.JSON(http.StatusOK, list)
}

// @Summary  发票费用明细
// @Tags     账单
// @Param    id path int true "配置 ID"
// @Param    internalId path string true "发票内部 ID"
// @Success  200 {array} oci.InvoiceLine
// @Security BearerAuth
// @Router   /api/v1/oci-configs/{id}/invoices/{internalId}/lines [get]
func (h *ociConfigHandler) invoiceLines(c *gin.Context) {
	id, ok := pathID(c)
	if !ok {
		return
	}
	lines, err := h.svc.InvoiceLines(c.Request.Context(), id, c.Param("internalId"))
	if err != nil {
		respondError(c, err)
		return
	}
	c.JSON(http.StatusOK, lines)
}

// @Summary  发票 PDF 下载
// @Tags     账单
// @Param    id path int true "配置 ID"
// @Param    internalId path string true "发票内部 ID"
// @Param    number query string false "发票号(用作下载文件名)"
// @Success  200 {file} binary "PDF 原文"
// @Security BearerAuth
// @Router   /api/v1/oci-configs/{id}/invoices/{internalId}/pdf [get]
func (h *ociConfigHandler) invoicePdf(c *gin.Context) {
	id, ok := pathID(c)
	if !ok {
		return
	}
	data, err := h.svc.InvoicePdf(c.Request.Context(), id, c.Param("internalId"))
	if err != nil {
		respondError(c, err)
		return
	}
	c.Header("Content-Disposition", fmt.Sprintf("attachment; filename=%q", pdfFileName(c.Query("number"), c.Param("internalId"))))
	c.Data(http.StatusOK, "application/pdf", data)
}

// pdfFileName 生成下载文件名:优先发票号,剔除引号/路径分隔等不安全字符。
func pdfFileName(number, internalID string) string {
	name := strings.TrimSpace(number)
	if name == "" {
		name = internalID
	}
	name = strings.Map(func(r rune) rune {
		if r == '"' || r == '/' || r == '\\' || r < 0x20 {
			return '_'
		}
		return r
	}, name)
	return name + ".pdf"
}

// @Summary  支付发票
// @Tags     账单
// @Param    id path int true "配置 ID"
// @Param    internalId path string true "发票内部 ID"
// @Param    body body payInvoiceRequest true "回执邮箱"
// @Success  200 {object} map[string]string
// @Security BearerAuth
// @Router   /api/v1/oci-configs/{id}/invoices/{internalId}/pay [post]
func (h *ociConfigHandler) payInvoice(c *gin.Context) {
	id, ok := pathID(c)
	if !ok {
		return
	}
	var req payInvoiceRequest
	if err := c.ShouldBindJSON(&req); err != nil {
		c.JSON(http.StatusBadRequest, gin.H{"error": err.Error()})
		return
	}
	if err := h.svc.PayInvoice(c.Request.Context(), id, c.Param("internalId"), req.Email); err != nil {
		respondError(c, err)
		return
	}
	c.JSON(http.StatusOK, gin.H{"status": "submitted"})
}

// @Summary  付款方式列表
// @Tags     账单
// @Param    id path int true "配置 ID"
// @Success  200 {array} oci.PaymentMethod
// @Security BearerAuth
// @Router   /api/v1/oci-configs/{id}/payment-methods [get]
func (h *ociConfigHandler) paymentMethods(c *gin.Context) {
	id, ok := pathID(c)
	if !ok {
		return
	}
	methods, err := h.svc.PaymentMethods(c.Request.Context(), id)
	if err != nil {
		respondError(c, err)
		return
	}
	c.JSON(http.StatusOK, methods)
}