// Package membership handles growth membership status and mock commerce orders.
package membership

import (
	"context"
	"errors"
	"strings"
	"time"

	"github.com/google/uuid"

	"github.com/yuxingu/digital-psychology/apps/api/internal/repository"
)

// Service is membership + order use-cases (extracted from report service).
type Service struct {
	Reports *repository.ReportRepo
}

// CreateOrderInput for commerce.
type CreateOrderInput struct {
	Kind     string
	Plan     string
	ReportID *uuid.UUID
}

// CreateOrder starts membership, deep_access, or ask_pack order.
func (s *Service) CreateOrder(ctx context.Context, userID uuid.UUID, in CreateOrderInput) (uuid.UUID, error) {
	if in.Kind != "membership" && in.Kind != "deep_access" && in.Kind != "ask_pack" {
		return uuid.Nil, errors.New("invalid kind")
	}
	if in.Kind == "deep_access" && in.ReportID == nil {
		return uuid.Nil, errors.New("report_id required")
	}
	amount := 990
	plan := in.Plan
	if in.Kind == "membership" {
		if plan == "" {
			plan = "month"
		}
		a, err := s.Reports.MembershipPlanAmountCents(ctx, plan)
		if err != nil {
			return uuid.Nil, err
		}
		if a <= 0 {
			return uuid.Nil, errors.New("invalid membership plan")
		}
		amount = a
	}
	if in.Kind == "ask_pack" {
		if plan == "" {
			plan = "pack10"
		}
		amount = repository.AskPackAmountCents(plan)
		if amount <= 0 || repository.AskPackQuota(plan) <= 0 {
			return uuid.Nil, errors.New("invalid ask_pack plan")
		}
	}
	return s.Reports.CreateOrder(ctx, userID, in.Kind, plan, in.ReportID, amount)
}

// Redeem applies a redemption code for the current registered user.
func (s *Service) Redeem(ctx context.Context, userID uuid.UUID, code string) (string, error) {
	code = strings.TrimSpace(code)
	if code == "" {
		return "", errors.New("code required")
	}
	return s.Reports.RedeemCode(ctx, userID, code)
}

// PayMock completes mock payment.
func (s *Service) PayMock(ctx context.Context, userID, orderID uuid.UUID) error {
	return s.Reports.PayMock(ctx, userID, orderID)
}

// Me is the public membership snapshot.
type Me struct {
	Active       bool       `json:"active"`
	Plan         string     `json:"plan,omitempty"`
	Status       string     `json:"status"`
	ExpiresAt    *time.Time `json:"expires_at,omitempty"`
	AskQuotaLeft int        `json:"ask_quota_left,omitempty"`
}

// Get returns current growth membership for the user.
func (s *Service) Get(ctx context.Context, userID uuid.UUID) (*Me, error) {
	row, err := s.Reports.GetMembership(ctx, userID)
	if err != nil {
		return nil, err
	}
	return &Me{
		Active:       row.Active,
		Plan:         row.Plan,
		Status:       row.Status,
		ExpiresAt:    row.ExpiresAt,
		AskQuotaLeft: row.AskQuotaLeft,
	}, nil
}