package web

import (
	"errors"
	"regexp"
	"strings"

	"quyun/v2/app/errorx"
	"quyun/v2/app/http/web/dto"
	"quyun/v2/app/services"
	"quyun/v2/database/models"
	"quyun/v2/pkg/consts"
	"quyun/v2/providers/jwt"

	"github.com/gofiber/fiber/v3"
	"go.ipao.vip/gen/types"
	"gorm.io/gorm"
)

// @provider
type tenantApply struct{}

var reTenantCode = regexp.MustCompile(`^[a-z0-9][a-z0-9_-]{2,63}$`)

// Application 获取当前用户的租户申请信息（申请创作者）。
//
//	@Summary	获取租户申请信息（申请创作者）
//	@Tags		Web
//	@Accept		json
//	@Produce	json
//	@Success	200	{object}	dto.TenantApplicationResponse	"成功"
//	@Router		/v1/tenant/application [get]
func (ctl *tenantApply) application(ctx fiber.Ctx) (*dto.TenantApplicationResponse, error) {
	claims, ok := ctx.Locals(consts.CtxKeyClaims).(*jwt.Claims)
	if !ok || claims == nil || claims.UserID <= 0 {
		return nil, errorx.ErrTokenInvalid
	}

	m, err := services.Tenant.FindOwnedByUserID(ctx, claims.UserID)
	if err != nil {
		if errors.Is(err, gorm.ErrRecordNotFound) {
			return &dto.TenantApplicationResponse{HasApplication: false}, nil
		}
		return nil, errorx.Wrap(err).WithMsg("查询申请信息失败，请稍后再试")
	}

	return &dto.TenantApplicationResponse{
		HasApplication:    true,
		TenantID:          m.ID,
		TenantCode:        m.Code,
		TenantName:        m.Name,
		Status:            m.Status,
		StatusDescription: m.Status.Description(),
		CreatedAt:         m.CreatedAt,
	}, nil
}

// Apply 申请创作者（创建租户申请）。
//
//	@Summary	提交租户申请（申请创作者）
//	@Tags		Web
//	@Accept		json
//	@Produce	json
//	@Param		form	body		dto.TenantApplyForm				true	"form"
//	@Success	200		{object}	dto.TenantApplicationResponse		"成功"
//	@Router		/v1/tenant/apply [post]
//	@Bind		form body
func (ctl *tenantApply) apply(ctx fiber.Ctx, form *dto.TenantApplyForm) (*dto.TenantApplicationResponse, error) {
	claims, ok := ctx.Locals(consts.CtxKeyClaims).(*jwt.Claims)
	if !ok || claims == nil || claims.UserID <= 0 {
		return nil, errorx.ErrTokenInvalid
	}

	code := strings.ToLower(strings.TrimSpace(form.Code))
	if code == "" {
		return nil, errorx.ErrMissingParameter.WithMsg("请填写租户 ID")
	}
	if !reTenantCode.MatchString(code) {
		return nil, errorx.ErrInvalidParameter.WithMsg("租户 ID 需为 3-64 位小写字母/数字/下划线/短横线，且以字母或数字开头")
	}
	name := strings.TrimSpace(form.Name)
	if name == "" {
		return nil, errorx.ErrMissingParameter.WithMsg("请填写租户名称")
	}

	// 一个用户仅可申请为一个租户创作者：若已存在 owned tenant，直接返回当前申请信息。
	existing, err := services.Tenant.FindOwnedByUserID(ctx, claims.UserID)
	if err == nil && existing != nil && existing.ID > 0 {
		return &dto.TenantApplicationResponse{
			HasApplication:    true,
			TenantID:          existing.ID,
			TenantCode:        existing.Code,
			TenantName:        existing.Name,
			Status:            existing.Status,
			StatusDescription: existing.Status.Description(),
			CreatedAt:         existing.CreatedAt,
		}, nil
	}
	if err != nil && !errors.Is(err, gorm.ErrRecordNotFound) {
		return nil, errorx.Wrap(err).WithMsg("申请校验失败，请稍后再试")
	}

	tenant := &models.Tenant{
		UserID: claims.UserID,
		Code:   code,
		UUID:   types.NewUUIDv4(),
		Name:   name,
		Status: consts.TenantStatusPendingVerify,
		Config: types.JSON([]byte(`{}`)),
	}

	db := models.Q.Tenant.WithContext(ctx).UnderlyingDB()
	err = db.Transaction(func(tx *gorm.DB) error {
		if err := tx.Create(tenant).Error; err != nil {
			return err
		}

		tenantUser := &models.TenantUser{
			TenantID: tenant.ID,
			UserID:   claims.UserID,
			Role:     types.NewArray([]consts.TenantUserRole{consts.TenantUserRoleTenantAdmin}),
			Status:   consts.UserStatusVerified,
		}
		if err := tx.Create(tenantUser).Error; err != nil {
			return err
		}

		return tx.First(tenant, tenant.ID).Error
	})
	if err != nil {
		if errors.Is(err, gorm.ErrDuplicatedKey) {
			return nil, errorx.ErrRecordDuplicated.WithMsg("租户 ID 已被占用，请换一个试试")
		}
		return nil, errorx.Wrap(err).WithMsg("提交申请失败，请稍后再试")
	}

	return &dto.TenantApplicationResponse{
		HasApplication:    true,
		TenantID:          tenant.ID,
		TenantCode:        tenant.Code,
		TenantName:        tenant.Name,
		Status:            tenant.Status,
		StatusDescription: tenant.Status.Description(),
		CreatedAt:         tenant.CreatedAt,
	}, nil
}