package infrastructure

import (
	"context"
	"strings"

	"mengstack/internal/modules/rbac/domain"

	"go.uber.org/zap"
	"gorm.io/gorm"
)

type permDef struct {
	Code   string
	Name   string
	Module string
	Desc   string
}

var defaultPermissions = []permDef{
	{"auth.user.read", "查看用户", "auth", "查看用户列表和详情"},
	{"auth.user.write", "管理用户", "auth", "创建、编辑、删除用户"},
	{"rbac.role.read", "查看角色", "rbac", "查看角色列表和详情"},
	{"rbac.role.write", "管理角色", "rbac", "创建、编辑、删除角色"},
	{"rbac.permission.read", "查看权限", "rbac", "查看权限列表"},
	{"rbac.permission.assign", "分配权限", "rbac", "为角色分配权限"},
	{"rbac.user_role.write", "分配角色", "rbac", "为用户分配角色"},
}

func Seed(db *gorm.DB, log *zap.Logger) error {
	ctx := context.Background()

	for _, p := range defaultPermissions {
		var count int64
		db.Model(&domain.Permission{}).Where("code = ?", p.Code).Count(&count)
		if count > 0 {
			continue
		}
		perm := &domain.Permission{
			Code:        p.Code,
			Name:        p.Name,
			Module:      p.Module,
			Description: p.Desc,
		}
		if err := db.WithContext(ctx).Create(perm).Error; err != nil {
			return err
		}
		log.Info("seeded permission", zap.String("code", p.Code))
	}

	var allPerms []domain.Permission
	if err := db.WithContext(ctx).Find(&allPerms).Error; err != nil {
		return err
	}
	if len(allPerms) == 0 {
		return nil
	}

	var tenantIDs []string
	if err := db.WithContext(ctx).Table("users").Distinct("tenant_id").
		Pluck("tenant_id", &tenantIDs).Error; err != nil {
		return err
	}

	for _, tid := range tenantIDs {
		if err := seedTenantRoles(ctx, db, log, tid, allPerms); err != nil {
			log.Error("seed tenant roles failed",
				zap.String("tenant_id", tid),
				zap.Error(err),
			)
		}
	}

	return nil
}

func seedTenantRoles(ctx context.Context, db *gorm.DB, log *zap.Logger, tenantID string, allPerms []domain.Permission) error {
	superAdmin := &domain.Role{}
	err := db.WithContext(ctx).
		Where("tenant_id = ? AND name = ?", tenantID, "super_admin").
		First(superAdmin).Error

	if err == gorm.ErrRecordNotFound {
		superAdmin = &domain.Role{
			TenantID:    tenantID,
			Name:        "super_admin",
			Description: "超级管理员",
			IsSystem:    true,
		}
		if err := db.WithContext(ctx).Create(superAdmin).Error; err != nil {
			return err
		}
		permRefs := make([]domain.Permission, len(allPerms))
		copy(permRefs, allPerms)
		if err := db.WithContext(ctx).Model(superAdmin).Association("Permissions").Replace(permRefs); err != nil {
			return err
		}
		log.Info("seeded super_admin role", zap.String("tenant_id", tenantID))
	} else if err != nil {
		return err
	}

	tenantAdmin := &domain.Role{}
	err = db.WithContext(ctx).
		Where("tenant_id = ? AND name = ?", tenantID, "tenant_admin").
		First(tenantAdmin).Error

	if err == gorm.ErrRecordNotFound {
		tenantAdmin = &domain.Role{
			TenantID:    tenantID,
			Name:        "tenant_admin",
			Description: "租户管理员",
			IsSystem:    true,
		}
		if err := db.WithContext(ctx).Create(tenantAdmin).Error; err != nil {
			return err
		}

		adminPermCodes := []string{
			"auth.user.read", "auth.user.write",
			"rbac.role.read", "rbac.permission.read", "rbac.user_role.write",
		}
		var adminPerms []domain.Permission
		for _, p := range allPerms {
			for _, code := range adminPermCodes {
				if p.Code == code {
					adminPerms = append(adminPerms, p)
					break
				}
			}
		}
		if len(adminPerms) > 0 {
			if err := db.WithContext(ctx).Model(tenantAdmin).Association("Permissions").Replace(adminPerms); err != nil {
				return err
			}
		}
		log.Info("seeded tenant_admin role", zap.String("tenant_id", tenantID))
	} else if err != nil {
		return err
	}

	member := &domain.Role{}
	err = db.WithContext(ctx).
		Where("tenant_id = ? AND name = ?", tenantID, "member").
		First(member).Error

	if err == gorm.ErrRecordNotFound {
		member = &domain.Role{
			TenantID:    tenantID,
			Name:        "member",
			Description: "普通成员",
			IsSystem:    true,
		}
		if err := db.WithContext(ctx).Create(member).Error; err != nil {
			return err
		}

		memberPermCodes := []string{"auth.user.read", "rbac.permission.read"}
		var memberPerms []domain.Permission
		for _, p := range allPerms {
			for _, code := range memberPermCodes {
				if strings.EqualFold(p.Code, code) {
					memberPerms = append(memberPerms, p)
					break
				}
			}
		}
		if len(memberPerms) > 0 {
			if err := db.WithContext(ctx).Model(member).Association("Permissions").Replace(memberPerms); err != nil {
				return err
			}
		}
		log.Info("seeded member role", zap.String("tenant_id", tenantID))
	} else if err != nil {
		return err
	}

	return nil
}