package handler

import (
	"strconv"
	"time"

	"apskel-pos-be/internal/appcontext"
	"apskel-pos-be/internal/constants"
	"apskel-pos-be/internal/contract"
	"apskel-pos-be/internal/logger"
	"apskel-pos-be/internal/service"
	"apskel-pos-be/internal/util"
	"apskel-pos-be/internal/validator"

	"github.com/gin-gonic/gin"
	"github.com/google/uuid"
)

type CashAdvanceHandler struct {
	cashAdvanceService   service.CashAdvanceService
	cashAdvanceValidator validator.CashAdvanceValidator
}

func NewCashAdvanceHandler(cashAdvanceService service.CashAdvanceService, cashAdvanceValidator validator.CashAdvanceValidator) *CashAdvanceHandler {
	return &CashAdvanceHandler{
		cashAdvanceService:   cashAdvanceService,
		cashAdvanceValidator: cashAdvanceValidator,
	}
}

func (h *CashAdvanceHandler) CreateCashAdvance(c *gin.Context) {
	ctx := c.Request.Context()
	contextInfo := appcontext.FromGinContext(ctx)

	var req contract.CreateCashAdvanceRequest
	if err := c.ShouldBindJSON(&req); err != nil {
		logger.FromContext(ctx).WithError(err).Error("CashAdvanceHandler::CreateCashAdvance -> request binding failed")
		validationResponseError := contract.NewResponseError(constants.MissingFieldErrorCode, constants.RequestEntity, err.Error())
		util.HandleResponse(c.Writer, c.Request, contract.BuildErrorResponse([]*contract.ResponseError{validationResponseError}), "CashAdvanceHandler::CreateCashAdvance")
		return
	}

	validationError, validationErrorCode := h.cashAdvanceValidator.ValidateCreateCashAdvanceRequest(&req)
	if validationError != nil {
		validationResponseError := contract.NewResponseError(validationErrorCode, constants.RequestEntity, validationError.Error())
		util.HandleResponse(c.Writer, c.Request, contract.BuildErrorResponse([]*contract.ResponseError{validationResponseError}), "CashAdvanceHandler::CreateCashAdvance")
		return
	}

	response := h.cashAdvanceService.CreateCashAdvance(ctx, contextInfo, &req)
	if response.HasErrors() {
		logger.FromContext(ctx).WithError(response.GetErrors()[0]).Error("CashAdvanceHandler::CreateCashAdvance -> Failed to create cash advance from service")
	}

	util.HandleResponse(c.Writer, c.Request, response, "CashAdvanceHandler::CreateCashAdvance")
}

func (h *CashAdvanceHandler) UpdateCashAdvance(c *gin.Context) {
	ctx := c.Request.Context()
	contextInfo := appcontext.FromGinContext(ctx)

	cashAdvanceID, err := uuid.Parse(c.Param("id"))
	if err != nil {
		logger.FromContext(ctx).WithError(err).Error("CashAdvanceHandler::UpdateCashAdvance -> Invalid cash advance ID")
		validationResponseError := contract.NewResponseError(constants.MalformedFieldErrorCode, constants.RequestEntity, "Invalid cash advance ID")
		util.HandleResponse(c.Writer, c.Request, contract.BuildErrorResponse([]*contract.ResponseError{validationResponseError}), "CashAdvanceHandler::UpdateCashAdvance")
		return
	}

	var req contract.UpdateCashAdvanceRequest
	if err := c.ShouldBindJSON(&req); err != nil {
		logger.FromContext(ctx).WithError(err).Error("CashAdvanceHandler::UpdateCashAdvance -> request binding failed")
		validationResponseError := contract.NewResponseError(constants.MissingFieldErrorCode, constants.RequestEntity, "Invalid request body")
		util.HandleResponse(c.Writer, c.Request, contract.BuildErrorResponse([]*contract.ResponseError{validationResponseError}), "CashAdvanceHandler::UpdateCashAdvance")
		return
	}

	validationError, validationErrorCode := h.cashAdvanceValidator.ValidateUpdateCashAdvanceRequest(&req)
	if validationError != nil {
		validationResponseError := contract.NewResponseError(validationErrorCode, constants.RequestEntity, validationError.Error())
		util.HandleResponse(c.Writer, c.Request, contract.BuildErrorResponse([]*contract.ResponseError{validationResponseError}), "CashAdvanceHandler::UpdateCashAdvance")
		return
	}

	response := h.cashAdvanceService.UpdateCashAdvance(ctx, contextInfo, cashAdvanceID, &req)
	if response.HasErrors() {
		logger.FromContext(ctx).WithError(response.GetErrors()[0]).Error("CashAdvanceHandler::UpdateCashAdvance -> Failed to update cash advance from service")
	}

	util.HandleResponse(c.Writer, c.Request, response, "CashAdvanceHandler::UpdateCashAdvance")
}

func (h *CashAdvanceHandler) DeleteCashAdvance(c *gin.Context) {
	ctx := c.Request.Context()
	contextInfo := appcontext.FromGinContext(ctx)

	cashAdvanceID, err := uuid.Parse(c.Param("id"))
	if err != nil {
		logger.FromContext(ctx).WithError(err).Error("CashAdvanceHandler::DeleteCashAdvance -> Invalid cash advance ID")
		validationResponseError := contract.NewResponseError(constants.MalformedFieldErrorCode, constants.RequestEntity, "Invalid cash advance ID")
		util.HandleResponse(c.Writer, c.Request, contract.BuildErrorResponse([]*contract.ResponseError{validationResponseError}), "CashAdvanceHandler::DeleteCashAdvance")
		return
	}

	response := h.cashAdvanceService.DeleteCashAdvance(ctx, contextInfo, cashAdvanceID)
	if response.HasErrors() {
		logger.FromContext(ctx).WithError(response.GetErrors()[0]).Error("CashAdvanceHandler::DeleteCashAdvance -> Failed to delete cash advance from service")
	}

	util.HandleResponse(c.Writer, c.Request, response, "CashAdvanceHandler::DeleteCashAdvance")
}

func (h *CashAdvanceHandler) GetCashAdvance(c *gin.Context) {
	ctx := c.Request.Context()
	contextInfo := appcontext.FromGinContext(ctx)

	cashAdvanceID, err := uuid.Parse(c.Param("id"))
	if err != nil {
		logger.FromContext(ctx).WithError(err).Error("CashAdvanceHandler::GetCashAdvance -> Invalid cash advance ID")
		validationResponseError := contract.NewResponseError(constants.MalformedFieldErrorCode, constants.RequestEntity, "Invalid cash advance ID")
		util.HandleResponse(c.Writer, c.Request, contract.BuildErrorResponse([]*contract.ResponseError{validationResponseError}), "CashAdvanceHandler::GetCashAdvance")
		return
	}

	response := h.cashAdvanceService.GetCashAdvanceByID(ctx, contextInfo, cashAdvanceID)
	if response.HasErrors() {
		logger.FromContext(ctx).WithError(response.GetErrors()[0]).Error("CashAdvanceHandler::GetCashAdvance -> Failed to get cash advance from service")
	}

	util.HandleResponse(c.Writer, c.Request, response, "CashAdvanceHandler::GetCashAdvance")
}

func (h *CashAdvanceHandler) ListCashAdvances(c *gin.Context) {
	ctx := c.Request.Context()
	contextInfo := appcontext.FromGinContext(ctx)

	req := &contract.ListCashAdvancesRequest{
		Page:  1,
		Limit: 10,
	}

	if pageStr := c.Query("page"); pageStr != "" {
		if page, err := strconv.Atoi(pageStr); err == nil {
			req.Page = page
		}
	}

	if limitStr := c.Query("limit"); limitStr != "" {
		if limit, err := strconv.Atoi(limitStr); err == nil {
			req.Limit = limit
		}
	}

	req.Search = c.Query("search")
	req.Status = c.Query("status")
	req.SettlementStatus = c.Query("settlement_status")
	req.Team = c.Query("team")
	req.TeamScope = c.Query("team_scope")

	if teamCategoryIDStr := c.Query("team_category_id"); teamCategoryIDStr != "" {
		if teamCategoryID, err := uuid.Parse(teamCategoryIDStr); err == nil {
			req.TeamCategoryID = &teamCategoryID
		}
	}

	if startDateStr := c.Query("start_date"); startDateStr != "" {
		if startDate, err := time.Parse("2006-01-02", startDateStr); err == nil {
			req.StartDate = &startDate
		}
	}

	if endDateStr := c.Query("end_date"); endDateStr != "" {
		if endDate, err := time.Parse("2006-01-02", endDateStr); err == nil {
			req.EndDate = &endDate
		}
	}

	validationError, validationErrorCode := h.cashAdvanceValidator.ValidateListCashAdvancesRequest(req)
	if validationError != nil {
		validationResponseError := contract.NewResponseError(validationErrorCode, constants.RequestEntity, validationError.Error())
		util.HandleResponse(c.Writer, c.Request, contract.BuildErrorResponse([]*contract.ResponseError{validationResponseError}), "CashAdvanceHandler::ListCashAdvances")
		return
	}

	response := h.cashAdvanceService.ListCashAdvances(ctx, contextInfo, req)
	if response.HasErrors() {
		logger.FromContext(ctx).WithError(response.GetErrors()[0]).Error("CashAdvanceHandler::ListCashAdvances -> Failed to list cash advances from service")
	}

	util.HandleResponse(c.Writer, c.Request, response, "CashAdvanceHandler::ListCashAdvances")
}

func (h *CashAdvanceHandler) UpdateCashAdvanceStatus(c *gin.Context) {
	ctx := c.Request.Context()
	contextInfo := appcontext.FromGinContext(ctx)

	cashAdvanceID, err := uuid.Parse(c.Param("id"))
	if err != nil {
		logger.FromContext(ctx).WithError(err).Error("CashAdvanceHandler::UpdateCashAdvanceStatus -> Invalid cash advance ID")
		validationResponseError := contract.NewResponseError(constants.MalformedFieldErrorCode, constants.RequestEntity, "Invalid cash advance ID")
		util.HandleResponse(c.Writer, c.Request, contract.BuildErrorResponse([]*contract.ResponseError{validationResponseError}), "CashAdvanceHandler::UpdateCashAdvanceStatus")
		return
	}

	status := c.Param("status")
	if status == "" {
		validationResponseError := contract.NewResponseError(constants.MissingFieldErrorCode, constants.RequestEntity, "Status parameter is required")
		util.HandleResponse(c.Writer, c.Request, contract.BuildErrorResponse([]*contract.ResponseError{validationResponseError}), "CashAdvanceHandler::UpdateCashAdvanceStatus")
		return
	}

	response := h.cashAdvanceService.UpdateCashAdvanceStatus(ctx, contextInfo, cashAdvanceID, status)
	if response.HasErrors() {
		logger.FromContext(ctx).WithError(response.GetErrors()[0]).Error("CashAdvanceHandler::UpdateCashAdvanceStatus -> Failed to update cash advance status from service")
	}

	util.HandleResponse(c.Writer, c.Request, response, "CashAdvanceHandler::UpdateCashAdvanceStatus")
}

// ListCashAdvanceTeams serves the team picker for the advance form: the parent
// categories of the caller's outlet, plus Pusat. Same list the purchase form uses.
func (h *CashAdvanceHandler) ListCashAdvanceTeams(c *gin.Context) {
	ctx := c.Request.Context()
	contextInfo := appcontext.FromGinContext(ctx)

	response := h.cashAdvanceService.ListCashAdvanceTeams(ctx, contextInfo)
	if response.HasErrors() {
		logger.FromContext(ctx).WithError(response.GetErrors()[0]).Error("CashAdvanceHandler::ListCashAdvanceTeams -> Failed to list cash advance teams from service")
	}

	util.HandleResponse(c.Writer, c.Request, response, "CashAdvanceHandler::ListCashAdvanceTeams")
}