package financeapplication

import (
	"errors"
	"strconv"
	"strings"

	"hyapp-admin-server/internal/middleware"
	"hyapp-admin-server/internal/model"
	"hyapp-admin-server/internal/modules/shared"
	"hyapp-admin-server/internal/repository"
	"hyapp-admin-server/internal/response"

	"github.com/gin-gonic/gin"
	"google.golang.org/grpc/codes"
	"google.golang.org/grpc/status"
	"gorm.io/gorm"
)

type Handler struct {
	service *Service
	audit   shared.OperationLogger
}

func New(store *repository.Store, audit shared.OperationLogger, options ...Option) *Handler {
	return &Handler{service: NewService(store, options...), audit: audit}
}

func (h *Handler) ListApplications(c *gin.Context) {
	options := shared.ListOptions(c)
	items, total, err := h.service.ListApplications(repository.FinanceApplicationListOptions{
		Page:      options.Page,
		PageSize:  options.PageSize,
		AppCode:   firstQuery(c, "app_code", "appCode"),
		Operation: firstQuery(c, "operation"),
		Status:    options.Status,
		Keyword:   options.Keyword,
	})
	if err != nil {
		response.ServerError(c, "获取财务申请列表失败")
		return
	}
	response.OK(c, response.Page{Items: items, Page: options.Page, PageSize: options.PageSize, Total: total})
}

func (h *Handler) ListMyApplications(c *gin.Context) {
	options := shared.ListOptions(c)
	items, total, err := h.service.ListMyApplications(shared.ActorFromContext(c), repository.FinanceApplicationListOptions{
		Page:      options.Page,
		PageSize:  options.PageSize,
		AppCode:   firstQuery(c, "app_code", "appCode"),
		Operation: firstQuery(c, "operation"),
		Status:    options.Status,
		Keyword:   options.Keyword,
	})
	if err != nil {
		writeServiceError(c, err, "获取我的财务申请列表失败")
		return
	}
	response.OK(c, response.Page{Items: items, Page: options.Page, PageSize: options.PageSize, Total: total})
}

func (h *Handler) CreateApplication(c *gin.Context) {
	var req createApplicationRequest
	if err := c.ShouldBindJSON(&req); err != nil {
		response.BadRequest(c, "财务申请参数不正确")
		return
	}
	item, err := h.service.CreateApplication(c.Request.Context(), shared.ActorFromContext(c), req)
	if err != nil {
		writeServiceError(c, err, "发起财务申请失败")
		return
	}
	shared.OperationLogWithResourceID(c, h.audit, "create-finance-application", "admin_finance_applications", idString(item.ID), "success", item.Operation)
	response.Created(c, item)
}

func (h *Handler) ApproveApplication(c *gin.Context) {
	h.auditApplication(c, model.FinanceApplicationStatusApproved)
}

func (h *Handler) RejectApplication(c *gin.Context) {
	h.auditApplication(c, model.FinanceApplicationStatusRejected)
}

func (h *Handler) AuditApplication(c *gin.Context) {
	var req struct {
		Decision    string `json:"decision"`
		AuditRemark string `json:"auditRemark"`
	}
	if err := c.ShouldBindJSON(&req); err != nil {
		response.BadRequest(c, "审核参数不正确")
		return
	}
	switch strings.TrimSpace(req.Decision) {
	case model.FinanceApplicationStatusApproved:
		h.auditApplicationWithRemark(c, model.FinanceApplicationStatusApproved, req.AuditRemark)
	case model.FinanceApplicationStatusRejected:
		h.auditApplicationWithRemark(c, model.FinanceApplicationStatusRejected, req.AuditRemark)
	default:
		response.BadRequest(c, "审核结果不正确")
	}
}

func (h *Handler) auditApplication(c *gin.Context, decision string) {
	var req auditApplicationRequest
	if err := c.ShouldBindJSON(&req); err != nil {
		response.BadRequest(c, "审核参数不正确")
		return
	}
	h.auditApplicationWithRemark(c, decision, req.AuditRemark)
}

func (h *Handler) auditApplicationWithRemark(c *gin.Context, decision string, remark string) {
	id, ok := shared.ParseID(c, "application_id")
	if !ok {
		return
	}
	var (
		item *applicationDTO
		err  error
	)
	if decision == model.FinanceApplicationStatusApproved {
		item, err = h.service.ApproveApplication(c.Request.Context(), shared.ActorFromContext(c), id, remark, middleware.CurrentRequestID(c))
	} else {
		item, err = h.service.RejectApplication(c.Request.Context(), shared.ActorFromContext(c), id, remark, middleware.CurrentRequestID(c))
	}
	if err != nil {
		writeServiceError(c, err, "审核财务申请失败")
		return
	}
	shared.OperationLogWithResourceID(c, h.audit, "audit-finance-application", "admin_finance_applications", idString(item.ID), "success", decision)
	response.OK(c, item)
}

func writeServiceError(c *gin.Context, err error, fallback string) {
	if errors.Is(err, gorm.ErrRecordNotFound) {
		response.NotFound(c, "财务申请不存在")
		return
	}
	if errors.Is(err, repository.ErrFinanceApplicationAlreadyAudited) {
		response.BadRequest(c, "申请已审核")
		return
	}
	switch err.Error() {
	case "没有操作权限":
		response.Forbidden(c, err.Error())
	case "admin store is not configured", "finance wallet executor is not configured":
		response.ServerError(c, fallback)
	default:
		if status.Code(err) == codes.NotFound {
			response.NotFound(c, err.Error())
			return
		}
		if st, ok := status.FromError(err); ok && strings.TrimSpace(st.Message()) != "" {
			switch st.Code() {
			case codes.PermissionDenied:
				response.Forbidden(c, st.Message())
				return
			case codes.InvalidArgument, codes.FailedPrecondition, codes.AlreadyExists, codes.Aborted, codes.ResourceExhausted:
				response.BadRequest(c, st.Message())
				return
			}
		}
		response.BadRequest(c, err.Error())
	}
}

func firstQuery(c *gin.Context, keys ...string) string {
	for _, key := range keys {
		if value := strings.TrimSpace(c.Query(key)); value != "" {
			return value
		}
	}
	return ""
}

func idString(id uint) string {
	return strconv.FormatUint(uint64(id), 10)
}